#include "editor/EditorCanvas.h"
#include "editor/EntityCutoutUtils.h"

#include "core/animation/AnimationSampling.h"
#include "core/depth/DepthService.h"

#include <algorithm>
#include <cmath>
#include <QBuffer>
#include <QDir>
#include <QFileInfo>
#include <QCursor>
#include <QMouseEvent>
#include <QPainter>
#include <QPaintEvent>
#include <QPainterPath>
#include <QWheelEvent>
#include <QKeyEvent>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QMimeData>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QTextOption>
#include <QIODevice>
#include <QPen>
#include <QPolygonF>
#include <QLineF>
#include <QTimer>
#include <QtConcurrent/QtConcurrent>

#include "core/image/ImageDecodeConfig.h"
#include "core/image/ImageFileLoader.h"
#include "core/large_image/VipsBackend.h"
#include "core/library/EntityJson.h"
#include "core/library/ToolJson.h"

namespace {

// 摄像机「输出」参考分辨率：视口框与预览缩放均按此换算，避免随窗口大小改变镜头覆盖的世界范围
constexpr double kCameraRefViewportW = 1600.0;
constexpr double kCameraRefViewportH = 900.0;

/// 画布自由缩放（世界→屏幕）上下限；与摄像机 viewScale 经 applyCameraViewport 换算后的 eff 对齐
constexpr qreal kViewScaleMin = 0.001;
constexpr qreal kViewScaleMax = 400.0;

constexpr int kSamCropMargin = 32;
constexpr int kMinStrokePointsSam = 4;
constexpr int kMinStrokePointsManual = 8;

[[nodiscard]] QPointF shapeCentroidWorld(const QVector<QPointF>& polyWorld, const QRectF& rect) {
    if (!polyWorld.isEmpty()) {
        return entity_cutout::polygonCentroid(polyWorld);
    }
    return rect.center();
}
constexpr int kMaxSamPointPrompts = 32;
constexpr char kMimeHotspotAnimationJson[] = "application/x-hfut-hotspot-animation+json";

static QImage readImageTolerant(const QString& absPath) {
    return core::image_file::loadImageLimited(absPath, core::image_decode::kWorkspaceMaxPixels);
}

/// 预览模式下：实体在屏上 footprint 较小时将贴图缩到约 2× 屏上最大边，降低过采样开销
static QImage entityImageForPresentationDrawLoRes(const QImage& src, qreal screenWpx, qreal screenHpx) {
    if (src.isNull()) {
        return src;
    }
    const int iw = src.width();
    const int ih = src.height();
    const qreal sm = std::max(screenWpx, screenHpx);
    if (!(sm > 1.0)) {
        return src;
    }
    const int cap = std::clamp(static_cast<int>(std::ceil(sm * 2.0)), 32, 4096);
    if (std::max(iw, ih) <= cap) {
        return src;
    }
    return src.scaled(QSize(cap, cap), Qt::KeepAspectRatio, Qt::SmoothTransformation);
}

QRectF cameraWorldViewportRect(const core::Project::Camera& cam) {
    const double s = std::max(1e-9, cam.viewScale);
    const double halfW = (kCameraRefViewportW * 0.5) / s;
    const double halfH = (kCameraRefViewportH * 0.5) / s;
    return QRectF(cam.centerWorld.x() - halfW, cam.centerWorld.y() - halfH, 2.0 * halfW, 2.0 * halfH);
}

QRectF clampRectTopLeftToBounds(const QRectF& rect, const QRectF& bounds) {
    if (rect.isNull() || bounds.isNull()) {
        return rect;
    }
    QRectF out = rect;
    if (out.width() > bounds.width()) {
        out.setWidth(bounds.width());
    }
    if (out.height() > bounds.height()) {
        out.setHeight(bounds.height());
    }
    QPointF tl = out.topLeft();
    if (tl.x() < bounds.left()) tl.setX(bounds.left());
    if (tl.y() < bounds.top()) tl.setY(bounds.top());
    if (tl.x() + out.width() > bounds.right()) tl.setX(bounds.right() - out.width());
    if (tl.y() + out.height() > bounds.bottom()) tl.setY(bounds.bottom() - out.height());
    out.moveTopLeft(tl);
    return out;
}

QVector<QPointF> snapStrokeToEdgesWorld(const QVector<QPointF>& strokeWorld, const QImage& bgGray,
                                        const QPointF& originWorld, const QSize& extentWorld,
                                        double searchRadiusWorld) {
    if (strokeWorld.size() < 3 || bgGray.isNull() || extentWorld.width() < 1 || extentWorld.height() < 1) {
        return strokeWorld;
    }
    const int w = bgGray.width();
    const int h = bgGray.height();
    const double sx = static_cast<double>(w) / static_cast<double>(extentWorld.width());
    const double sy = static_cast<double>(h) / static_cast<double>(extentWorld.height());
    const int rPix = std::max(1, static_cast<int>(std::ceil(searchRadiusWorld * std::min(sx, sy))));
    const double invSx = 1.0 / sx;
    const double invSy = 1.0 / sy;

    auto at = [&](int x, int y) -> int {
        x = std::clamp(x, 0, w - 1);
        y = std::clamp(y, 0, h - 1);
        return static_cast<int>(static_cast<const uchar*>(bgGray.constScanLine(y))[x]);
    };
    auto gradMag = [&](int x, int y) -> int {
        const int gx =
            -at(x - 1, y - 1) + at(x + 1, y - 1) +
            -2 * at(x - 1, y) + 2 * at(x + 1, y) +
            -at(x - 1, y + 1) + at(x + 1, y + 1);
        const int gy =
            -at(x - 1, y - 1) - 2 * at(x, y - 1) - at(x + 1, y - 1) +
            at(x - 1, y + 1) + 2 * at(x, y + 1) + at(x + 1, y + 1);
        return std::abs(gx) + std::abs(gy);
    };

    QVector<QPointF> out;
    out.reserve(strokeWorld.size());
    for (const QPointF& p : strokeWorld) {
        const double lx = (p.x() - originWorld.x()) * sx;
        const double ly = (p.y() - originWorld.y()) * sy;
        const int cx = static_cast<int>(std::round(lx));
        const int cy = static_cast<int>(std::round(ly));
        int bestX = cx;
        int bestY = cy;
        int bestG = -1;
        for (int dy = -rPix; dy <= rPix; ++dy) {
            for (int dx = -rPix; dx <= rPix; ++dx) {
                const int x = cx + dx;
                const int y = cy + dy;
                if (x < 0 || y < 0 || x >= w || y >= h) {
                    continue;
                }
                const int g = gradMag(x, y);
                if (g > bestG) {
                    bestG = g;
                    bestX = x;
                    bestY = y;
                }
            }
        }
        out.push_back(QPointF(originWorld.x() + (static_cast<double>(bestX) + 0.5) * invSx,
                              originWorld.y() + (static_cast<double>(bestY) + 0.5) * invSy));
    }
    return out;
}

bool buildSamSegmentPayloadFromStrokeMapped(const QVector<QPointF>& strokeWorld, const QImage& cropAny,
                                            const QRect& cropWorldRect, QByteArray& outCropPng,
                                            QByteArray& outOverlayPng, QPointF& outCropTopLeftWorld,
                                            QJsonArray& outPointCoords, QJsonArray& outPointLabels,
                                            QJsonArray& outBoxXyxy) {
    if (strokeWorld.size() < kMinStrokePointsSam || cropAny.isNull() || cropWorldRect.width() < 1 ||
        cropWorldRect.height() < 1) {
        return false;
    }
    outCropPng.clear();
    outOverlayPng.clear();
    outPointCoords = QJsonArray{};
    outPointLabels = QJsonArray{};
    outBoxXyxy = QJsonArray{};

    const QImage cropRgb = cropAny.convertToFormat(QImage::Format_RGB888);
    if (cropRgb.isNull()) {
        return false;
    }

    const QPointF origin = cropWorldRect.topLeft();
    outCropTopLeftWorld = origin;
    const int cw = cropRgb.width();
    const int ch = cropRgb.height();
    const double sx = static_cast<double>(cw) / static_cast<double>(cropWorldRect.width());
    const double sy = static_cast<double>(ch) / static_cast<double>(cropWorldRect.height());

    QBuffer bufCrop(&outCropPng);
    if (!bufCrop.open(QIODevice::WriteOnly) || !cropRgb.save(&bufCrop, "PNG")) {
        outCropPng.clear();
        return false;
    }
    bufCrop.close();

    QImage overlay(cw, ch, QImage::Format_ARGB32_Premultiplied);
    overlay.fill(Qt::transparent);
    {
        QPainter pop(&overlay);
        pop.setRenderHint(QPainter::Antialiasing, true);
        QPen pen(QColor(255, 60, 60, 240));
        pen.setWidthF(4.0);
        pen.setCapStyle(Qt::RoundCap);
        pen.setJoinStyle(Qt::RoundJoin);
        pop.setPen(pen);
        QPolygonF local;
        local.reserve(strokeWorld.size());
        for (const QPointF& w : strokeWorld) {
            local.append(QPointF((w.x() - origin.x()) * sx, (w.y() - origin.y()) * sy));
        }
        pop.drawPolyline(local);
    }
    QBuffer bufOv(&outOverlayPng);
    if (!bufOv.open(QIODevice::WriteOnly) || !overlay.save(&bufOv, "PNG")) {
        outOverlayPng.clear();
        return false;
    }
    bufOv.close();

    auto clampD = [](double v, double lo, double hi) { return std::clamp(v, lo, hi); };

    const QPointF centerWorld = QPolygonF(strokeWorld).boundingRect().center();
    const QPointF centerLocal((centerWorld.x() - origin.x()) * sx, (centerWorld.y() - origin.y()) * sy);
    const double fgx = clampD(centerLocal.x(), 0.0, static_cast<double>(cw - 1));
    const double fgy = clampD(centerLocal.y(), 0.0, static_cast<double>(ch - 1));
    outPointCoords.append(QJsonArray{fgx, fgy});
    outPointLabels.append(1);

    const int n = static_cast<int>(strokeWorld.size());
    const int maxBg = std::max(0, kMaxSamPointPrompts - 1);
    if (n >= 2 && maxBg > 0) {
        const int step = std::max(1, (n + maxBg - 1) / maxBg);
        for (int i = 0; i < n; i += step) {
            const QPointF L((strokeWorld[i].x() - origin.x()) * sx, (strokeWorld[i].y() - origin.y()) * sy);
            const double bx = clampD(L.x(), 0.0, static_cast<double>(cw - 1));
            const double by = clampD(L.y(), 0.0, static_cast<double>(ch - 1));
            outPointCoords.append(QJsonArray{bx, by});
            outPointLabels.append(0);
        }
    }

    const QRectF tight = QPolygonF(strokeWorld).boundingRect();
    double x1 = clampD((tight.left() - origin.x()) * sx, 0.0, static_cast<double>(cw - 1));
    double y1 = clampD((tight.top() - origin.y()) * sy, 0.0, static_cast<double>(ch - 1));
    double x2 = clampD((tight.right() - origin.x()) * sx, 0.0, static_cast<double>(cw - 1));
    double y2 = clampD((tight.bottom() - origin.y()) * sy, 0.0, static_cast<double>(ch - 1));
    if (x2 <= x1) {
        x2 = std::min(static_cast<double>(cw - 1), x1 + 1.0);
    }
    if (y2 <= y1) {
        y2 = std::min(static_cast<double>(ch - 1), y1 + 1.0);
    }
    outBoxXyxy = QJsonArray{x1, y1, x2, y2};
    return true;
}

void drawCheckerboard(QPainter& p, const QRect& r) {
    // 轻量级棋盘格，让透明/纯色背景也有参照
    const int cell = 16;
    const QColor c1(245, 245, 245);
    const QColor c2(230, 230, 230);

    for (int y = r.top(); y < r.bottom(); y += cell) {
        for (int x = r.left(); x < r.right(); x += cell) {
            const bool odd = ((x / cell) + (y / cell)) % 2;
            p.fillRect(QRect(x, y, cell, cell), odd ? c1 : c2);
        }
    }
}

void drawGrid(QPainter& p, const QRect& r) {
    const int step = 64;
    QPen pen(QColor(0, 0, 0, 24));
    pen.setWidth(1);
    p.setPen(pen);

    for (int x = r.left(); x <= r.right(); x += step) {
        p.drawLine(QPoint(x, r.top()), QPoint(x, r.bottom()));
    }
    for (int y = r.top(); y <= r.bottom(); y += step) {
        p.drawLine(QPoint(r.left(), y), QPoint(r.right(), y));
    }
}

QRectF transformedRectByScaleAndTranslate(const QRectF& r, const QPointF& center, double scaleRatio, const QPointF& delta) {
    if (r.isNull()) {
        return r.translated(delta);
    }
    const QPointF c = center + delta;
    auto mapPt = [&](const QPointF& p) {
        return c + (p + delta - c) * scaleRatio;
    };
    const QPointF p1 = mapPt(r.topLeft());
    const QPointF p2 = mapPt(r.topRight());
    const QPointF p3 = mapPt(r.bottomLeft());
    const QPointF p4 = mapPt(r.bottomRight());
    const qreal minX = std::min({p1.x(), p2.x(), p3.x(), p4.x()});
    const qreal minY = std::min({p1.y(), p2.y(), p3.y(), p4.y()});
    const qreal maxX = std::max({p1.x(), p2.x(), p3.x(), p4.x()});
    const qreal maxY = std::max({p1.y(), p2.y(), p3.y(), p4.y()});
    return QRectF(QPointF(minX, minY), QPointF(maxX, maxY));
}

int sampleDepthAtPoint(const QImage& depth8, const QPointF& worldPos) {
    if (depth8.isNull() || depth8.format() != QImage::Format_Grayscale8) {
        return 0;
    }
    const int xi = static_cast<int>(std::floor(worldPos.x()));
    const int yi = static_cast<int>(std::floor(worldPos.y()));
    if (xi < 0 || yi < 0 || xi >= depth8.width() || yi >= depth8.height()) {
        return 0;
    }
    return static_cast<int>(depth8.constScanLine(yi)[xi]);
}

double depthToScale01(int depthZ) {
    // 约定：depth=0 最远，depth=255 最近（与后端输出一致）。映射为 0..1（远->0，近->1）。
    const int d = std::clamp(depthZ, 0, 255);
    return static_cast<double>(d) / 255.0;
}

// depth01 0..1 -> 原始距离乘子 0.5..1.5；calibMult>0 时除以创建时记录的基准，使「原位置」为 1.0
double distanceScaleFromDepth01(double depth01, double calibMult) {
    const double d = std::clamp(depth01, 0.0, 1.0);
    const double raw = 0.5 + d * 1.0;
    if (calibMult > 0.0) {
        return raw / std::max(calibMult, 1e-6);
    }
    return raw;
}

struct GizmoHit {
    EditorCanvas::DragMode mode = EditorCanvas::DragMode::None;
};

GizmoHit hitTestGizmo(const QPointF& mouseView, const QPointF& originView) {
    // 以 view 像素为单位的手柄大小（不随缩放变化）
    const qreal len = 56.0;
    const qreal halfThickness = 6.0;

    const QRectF xHandle(QPointF(originView.x(), originView.y() - halfThickness),
                         QSizeF(len, halfThickness * 2.0));
    const QRectF yHandle(QPointF(originView.x() - halfThickness, originView.y()),
                         QSizeF(halfThickness * 2.0, len));

    if (xHandle.contains(mouseView)) {
        return {EditorCanvas::DragMode::AxisX};
    }
    if (yHandle.contains(mouseView)) {
        return {EditorCanvas::DragMode::AxisY};
    }
    return {};
}

struct BubbleLayoutWorld {
    QPainterPath path;
    QRectF bodyRect;
};

// originWorld = 朝下三角形尖端；滑块改变主体水平位置，使「平直底边」上 t01 对应点始终在尖端正上方（三角竖直、与主体一体平移）
static BubbleLayoutWorld bubbleLayoutWorld(const core::Project::Tool& tool) {
    const QPointF tip = tool.originWorld;
    const qreal w = 220.0;
    const qreal h = 110.0;
    const qreal rx = 16.0;
    const qreal arrowH = 22.0;
    const double t01 = std::clamp(tool.bubblePointerT01, 0.0, 1.0);
    const qreal spanFlat = std::max(w - 2.0 * rx, 1.0);
    const qreal bodyLeft = tip.x() - rx - static_cast<qreal>(t01) * spanFlat;
    const QRectF body(bodyLeft, tip.y() - (h + arrowH), w, h);
    const qreal halfTri = 14.0;
    const qreal baseCx = tip.x();

    QPainterPath path;
    path.addRoundedRect(body, rx, rx);
    QPolygonF tri;
    tri << QPointF(baseCx - halfTri, body.bottom()) << QPointF(baseCx + halfTri, body.bottom()) << QPointF(tip.x(), tip.y());
    path.addPolygon(tri);
    return BubbleLayoutWorld{path, body};
}

static QPainterPath bubblePathWorld(const core::Project::Tool& tool) {
    return bubbleLayoutWorld(tool).path;
}

}  // namespace

EditorCanvas::EditorCanvas(QWidget* parent)
    : QWidget(parent) {
    setAutoFillBackground(false);
    setMinimumSize(480, 320);
    setFocusPolicy(Qt::StrongFocus);
    setMouseTracking(true);
    setAcceptDrops(true);

    m_previewEmitTimer.start();

    m_presZoomTimer = new QTimer(this);
    m_presZoomTimer->setInterval(16);
    connect(m_presZoomTimer, &QTimer::timeout, this, &EditorCanvas::tickPresentationZoomAnimation);

    m_presHoverTimer = new QTimer(this);
    m_presHoverTimer->setInterval(40);
    connect(m_presHoverTimer, &QTimer::timeout, this, &EditorCanvas::tickPresentationHoverAnimation);

    updateCursor();
}

void EditorCanvas::dragEnterEvent(QDragEnterEvent* e) {
    if (!e || !e->mimeData()) {
        return;
    }
    if (!m_presentationPreviewMode && m_presentationHotspotEditorActive &&
        e->mimeData()->hasFormat(QString::fromUtf8(kMimeHotspotAnimationJson))) {
        e->acceptProposedAction();
        return;
    }
    if (e->mimeData()->hasFormat(QStringLiteral("application/x-hfut-resource+json"))) {
        e->acceptProposedAction();
        return;
    }
    QWidget::dragEnterEvent(e);
}

void EditorCanvas::dragMoveEvent(QDragMoveEvent* e) {
    if (!e || !e->mimeData()) {
        return;
    }
    if (!m_presentationPreviewMode && m_presentationHotspotEditorActive &&
        e->mimeData()->hasFormat(QString::fromUtf8(kMimeHotspotAnimationJson))) {
        e->acceptProposedAction();
        return;
    }
    if (e->mimeData()->hasFormat(QStringLiteral("application/x-hfut-resource+json"))) {
        e->acceptProposedAction();
        return;
    }
    QWidget::dragMoveEvent(e);
}

void EditorCanvas::dropEvent(QDropEvent* e) {
    if (!e || !e->mimeData()) {
        QWidget::dropEvent(e);
        return;
    }
    if (!m_presentationPreviewMode && m_presentationHotspotEditorActive &&
        e->mimeData()->hasFormat(QString::fromUtf8(kMimeHotspotAnimationJson))) {
        const QByteArray bytes = e->mimeData()->data(QString::fromUtf8(kMimeHotspotAnimationJson));
        const auto doc = QJsonDocument::fromJson(bytes);
        if (!doc.isObject()) {
            e->ignore();
            return;
        }
        const QString animationId = doc.object().value(QStringLiteral("animationId")).toString();
        if (animationId.isEmpty()) {
            e->ignore();
            return;
        }
        emit requestAddPresentationHotspotForAnimation(viewToWorld(e->position()), animationId);
        e->acceptProposedAction();
        return;
    }
    if (!e->mimeData()->hasFormat(QStringLiteral("application/x-hfut-resource+json"))) {
        QWidget::dropEvent(e);
        return;
    }
    const QByteArray bytes = e->mimeData()->data(QStringLiteral("application/x-hfut-resource+json"));
    const auto doc = QJsonDocument::fromJson(bytes);
    if (!doc.isObject()) {
        e->ignore();
        return;
    }
    const QJsonObject root = doc.object();
    const QString kind = root.value(QStringLiteral("kind")).toString(QStringLiteral("entity"));

    const QPointF dropWorld = viewToWorld(e->position());
    if (kind == QStringLiteral("tool")) {
        if (!root.value(QStringLiteral("tool")).isObject()) {
            e->ignore();
            return;
        }
        core::Project::Tool t;
        if (!core::library::toolFromJson(root.value(QStringLiteral("tool")).toObject(), t)) {
            e->ignore();
            return;
        }
        // 让主窗口分配 id，避免冲突
        t.id.clear();
        t.parentId.clear();
        t.parentOffsetWorld = QPointF();
        t.originWorld = dropWorld;
        emit requestAddTool(t);
        e->acceptProposedAction();
        return;
    }

    if (!root.value(QStringLiteral("entity")).isObject()) {
        e->ignore();
        return;
    }
    core::Project::Entity ent;
    if (!core::library::entityFromJson(root.value(QStringLiteral("entity")).toObject(), ent)) {
        e->ignore();
        return;
    }

    // 让主窗口分配 id，避免资源 id 与工程内冲突
    ent.id.clear();
    ent.imagePath.clear();
    ent.entityPayloadPath.clear();

    ent.originWorld = dropWorld;

    // 默认把贴图左上角放到 originWorld + offset
    QPointF imageOffset(-128, -128);
    if (root.value(QStringLiteral("imageOffsetFromOrigin")).isArray()) {
        const QJsonArray a = root.value(QStringLiteral("imageOffsetFromOrigin")).toArray();
        if (a.size() >= 2) {
            imageOffset = QPointF(a.at(0).toDouble(), a.at(1).toDouble());
        }
    }
    ent.imageTopLeftWorld = ent.originWorld + imageOffset;

    // 生成占位贴图（未来可替换为真实资源图片）
    QSize imgSize(256, 256);
    if (root.value(QStringLiteral("imageSize")).isArray()) {
        const QJsonArray a = root.value(QStringLiteral("imageSize")).toArray();
        if (a.size() >= 2) {
            imgSize = QSize(a.at(0).toInt(256), a.at(1).toInt(256));
        }
    }
    QColor accent(80, 160, 255);
    if (root.value(QStringLiteral("accent")).isArray()) {
        const QJsonArray a = root.value(QStringLiteral("accent")).toArray();
        if (a.size() >= 4) {
            accent = QColor(a.at(0).toInt(80), a.at(1).toInt(160), a.at(2).toInt(255), a.at(3).toInt(255));
        }
    }
    if (!imgSize.isValid()) {
        imgSize = QSize(256, 256);
    }
    QImage img(imgSize, QImage::Format_ARGB32_Premultiplied);
    img.fill(Qt::transparent);
    {
        QPainter p(&img);
        p.setRenderHint(QPainter::Antialiasing, true);
        QRectF rr(QPointF(0, 0), QSizeF(imgSize));
        rr = rr.adjusted(6, 6, -6, -6);
        p.setPen(QPen(QColor(0, 0, 0, 60), 2));
        p.setBrush(QBrush(accent));
        p.drawRoundedRect(rr, 18, 18);
    }

    emit requestAddEntity(ent, img);
    e->acceptProposedAction();
}

void EditorCanvas::setPreviewCameraViewLocked(bool on) {
    m_previewCameraViewLocked = on;
}

void EditorCanvas::applyCameraViewport(const QPointF& centerWorld, double viewScale) {
    // 与 cameraWorldViewportRect 一致：viewScale 表示在 1600×900 参考视口下的像素/世界比；
    // 实际画布用 min(宽/1600, 高/900) 将参考视口适配进当前控件，使可见世界宽高恒为 1600/s × 900/s。
    const double pixelRatio =
        std::min(static_cast<double>(std::max(1, width())) / kCameraRefViewportW,
                 static_cast<double>(std::max(1, height())) / kCameraRefViewportH);
    const double eff = std::max(1e-9, static_cast<double>(viewScale)) * pixelRatio;
    m_scale = std::clamp(static_cast<qreal>(eff), kViewScaleMin, kViewScaleMax);
    m_pan = QPointF(width() / 2.0, height() / 2.0) - QPointF(centerWorld.x() * m_scale, centerWorld.y() * m_scale);
    invalidateViewportLod();
    update();
}

QPointF EditorCanvas::viewCenterWorld() const {
    return viewToWorld(QPointF(width() / 2.0, height() / 2.0));
}

void EditorCanvas::setPresentationHotspots(const QVector<core::Project::PresentationHotspot>& hotspots) {
    m_presentationHotspots = hotspots;
    bool found = false;
    for (const auto& h : m_presentationHotspots) {
        if (h.id == m_selectedPresentationHotspotId) {
            found = true;
            break;
        }
    }
    if (!found) {
        m_selectedPresentationHotspotId.clear();
    }
    update();
}

void EditorCanvas::setPresentationHotspotEditorActive(bool on) {
    if (m_presentationHotspotEditorActive == on) {
        return;
    }
    m_presentationHotspotEditorActive = on;
    if (!on) {
        m_draggingHotspotIndex = -1;
        m_dragging = false;
    }
    updateCursor();
    update();
}

void EditorCanvas::setPresentationHotspotPlaybackTargetEnabled(bool on) {
    if (m_presentationHotspotPlaybackTargetEnabled == on) {
        return;
    }
    m_presentationHotspotPlaybackTargetEnabled = on;
    if (!on) {
        if (m_presHoverTimer) {
            m_presHoverTimer->stop();
        }
        m_presHoverEntityIndex = -1;
        m_presFocusedEntityIndex = -1;
        m_presHoverPhase = 0.0;
        m_presZoomAnimT = 0.0;
        m_presZoomFinishingRestore = false;
        m_presBgPanSession = false;
        m_presBgDragDist = 0.0;
        emit presentationInteractionDismissed();
    }
    updateCursor();
    update();
}

void EditorCanvas::setSelectedPresentationHotspotId(const QString& id) {
    m_selectedPresentationHotspotId = id;
    update();
}

void EditorCanvas::clearPresentationHotspotSelection() {
    m_selectedPresentationHotspotId.clear();
    m_draggingHotspotIndex = -1;
    update();
}

void EditorCanvas::setPresentationPreviewMode(bool on) {
    if (m_presentationPreviewMode == on) {
        return;
    }
    m_presentationPreviewMode = on;
    if (m_presZoomTimer) {
        m_presZoomTimer->stop();
    }
    if (m_presHoverTimer) {
        m_presHoverTimer->stop();
    }
    m_presHoverEntityIndex = -1;
    m_presFocusedEntityIndex = -1;
    m_presHoverPhase = 0.0;
    m_presZoomAnimT = 0.0;
    m_presZoomFinishingRestore = false;
    m_presBgPanSession = false;
    m_presBgDragDist = 0.0;
    cancelBlackholeCopyResolve();
    m_draggingHotspotIndex = -1;
    if (on) {
        m_tool = Tool::Move;
        m_selectedEntity = -1;
        m_selectedBlackholeEntityId.clear();
        m_draggingEntity = false;
        m_drawingEntity = false;
        m_dragMode = DragMode::None;
        emit selectedEntityChanged(false, QString(), 0, QPointF());
    }
    m_bgCutoutDirty = true;
    updateCursor();
    update();
}

void EditorCanvas::setEntities(const QVector<core::Project::Entity>& entities,
                               const QVector<double>& opacities01,
                               const QString& projectDirAbs) {
    const QString prevSelectedId =
        (m_selectedEntity >= 0 && m_selectedEntity < m_entities.size()) ? m_entities[m_selectedEntity].id : QString();

    m_blackholeOverlayImageCache.clear();
    m_projectDirAbs = projectDirAbs;

    m_entities.clear();
    m_entities.reserve(entities.size());

    // 需要用深度图来自动计算 z 与缩放（逐帧）
    if (!m_depthAbsPath.isEmpty()) {
        if (m_depthDirty) {
            m_depthDirty = false;
            m_depthImage8 = core::image_file::loadDepthMapAlignedToBackground(m_depthAbsPath, m_bgAbsPath);
        }
    }

    const qsizetype nEnt = entities.size();
    for (qsizetype iEnt = 0; iEnt < nEnt; ++iEnt) {
        const auto& e = entities[iEnt];
        Entity v;
        v.id = e.id;
        v.opacity = (iEnt < opacities01.size()) ? std::clamp(opacities01[iEnt], 0.0, 1.0) : 1.0;
        // 注意：MainWindow 传入的是“按当前帧求值后的实体”（包含父子跟随与曲线采样）。
        // 这里必须直接使用 e.originWorld，不能再对 locationKeys 做二次采样，否则父子实体会在刷新时复位/跳变。
        const QPointF originWorld = e.originWorld;
        v.animatedOriginWorld = originWorld;
        v.cutoutPolygonWorld = e.cutoutPolygonWorld;
        v.blackholeVisible = e.blackholeVisible;
        v.blackholeOverlayPath = e.blackholeOverlayPath;
        v.blackholeOverlayRect = e.blackholeOverlayRect;
        v.distanceScaleCalibMult = e.distanceScaleCalibMult;
        v.ignoreDistanceScale = e.ignoreDistanceScale;
        v.priority = e.priority;

        const double userScaleAnimated =
            core::sampleUserScale(e.userScaleKeys, m_currentFrame, e.userScale, core::KeyInterpolation::Linear);
        v.userScale = std::max(1e-6, userScaleAnimated);

        // 逐帧自动算 z：采样点必须对“重锚枢轴(相对位置)”不敏感，否则会导致深度→缩放变化，
        // 表现为“中心没改但看起来位置/形心漂移”。
        //
        // 做法：先用工程给出的 depth 计算一次 scale0，构建 polygonWorld 得到稳定的形心，再用该形心采样深度，
        // 然后用采样到的 z 计算最终 scale。
        const double ds01Base = depthToScale01(e.depth);
        const double distScale0 =
            e.ignoreDistanceScale ? 1.0 : distanceScaleFromDepth01(ds01Base, e.distanceScaleCalibMult);
        const double scale0 = distScale0 * v.userScale;

        QVector<QPointF> poly0;
        poly0.reserve(e.polygonLocal.size());
        for (const auto& lp : e.polygonLocal) {
            poly0.push_back(originWorld + lp * scale0);
        }
        const QPointF c0 = poly0.isEmpty() ? originWorld : entity_cutout::polygonCentroid(poly0);
        const int z = (!m_depthImage8.isNull()) ? sampleDepthAtPoint(m_depthImage8, c0) : e.depth;
        v.depth = z;

        const double ds01 = depthToScale01(z);
        v.animatedDepthScale01 = ds01;
        const double distScale = e.ignoreDistanceScale ? 1.0 : distanceScaleFromDepth01(ds01, e.distanceScaleCalibMult);
        const double scale = distScale * v.userScale;
        v.visualScale = scale;

        v.polygonWorld.clear();
        v.polygonWorld.reserve(e.polygonLocal.size());
        for (const auto& lp : e.polygonLocal) {
            v.polygonWorld.push_back(originWorld + lp * scale);
        }

        // 贴图按 origin 缩放
        v.imageTopLeft = originWorld + (e.imageTopLeftWorld - e.originWorld) * scale;
        v.pathWorld = entity_cutout::pathFromWorldPolygon(v.polygonWorld);
        v.rect = v.pathWorld.boundingRect();
        v.color = QColor(255, 120, 0, 70);

        if (!e.runtimeImagePng.isEmpty()) {
            QImage img;
            img.loadFromData(e.runtimeImagePng, "PNG");
            if (!img.isNull() && img.format() != QImage::Format_ARGB32_Premultiplied) {
                img = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
            }
            v.image = img;
        } else {
            const QString imgRel = e.imagePath;
            if (imgRel.startsWith(QStringLiteral("pngb64:"))) {
                const QByteArray b64 = imgRel.mid(QStringLiteral("pngb64:").size()).toLatin1();
                const QByteArray raw = QByteArray::fromBase64(b64);
                QImage img;
                img.loadFromData(raw, "PNG");
                if (!img.isNull() && img.format() != QImage::Format_ARGB32_Premultiplied) {
                    img = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
                }
                v.image = img;
            } else if (!imgRel.isEmpty() && !projectDirAbs.isEmpty()) {
                const QString abs = QDir(projectDirAbs).filePath(imgRel);
                if (QFileInfo::exists(abs)) {
                    QImage img(abs);
                    if (!img.isNull() && img.format() != QImage::Format_ARGB32_Premultiplied) {
                        img = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
                    }
                    v.image = img;
                }
            }
        }
        m_entities.push_back(v);
    }

    // 绘制/命中顺序：
    // - priority 小（低）先画，大（高）后画，高优先级盖住低优先级
    // - priority 相同：深度小（远）先画，大（近）后画，近处盖住远处（等价于按距离缩放决定上下层）
    std::stable_sort(m_entities.begin(), m_entities.end(),
                     [](const Entity& a, const Entity& b) {
                         if (a.priority != b.priority) {
                             return a.priority < b.priority;
                         }
                         if (a.depth != b.depth) {
                             return a.depth < b.depth;
                         }
                         return a.id < b.id;
                     });

    m_selectedEntity = -1;
    if (!prevSelectedId.isEmpty()) {
        for (int i = 0; i < m_entities.size(); ++i) {
            if (m_entities[i].id == prevSelectedId) {
                m_selectedEntity = i;
                break;
            }
        }
    }

    if (m_selectedEntity >= 0) {
        const auto& ent = m_entities[m_selectedEntity];
        const QPointF origin =
            ent.polygonWorld.isEmpty() ? ent.rect.center() : entity_cutout::polygonCentroid(ent.polygonWorld);
        emit selectedEntityChanged(true, ent.id, ent.depth, origin);
    } else if (!prevSelectedId.isEmpty()) {
        emit selectedEntityChanged(false, QString(), 0, QPointF());
    }

    if (!m_selectedBlackholeEntityId.isEmpty()) {
        bool exists = false;
        for (const auto& ent : m_entities) {
            if (ent.id == m_selectedBlackholeEntityId && !ent.cutoutPolygonWorld.isEmpty()) {
                exists = true;
                break;
            }
        }
        if (!exists) {
            m_selectedBlackholeEntityId.clear();
        }
    }
    if (m_blackholeCopyResolveActive) {
        bool exists = false;
        for (const auto& ent : m_entities) {
            if (ent.id == m_blackholeCopyEntityId && !ent.cutoutPolygonWorld.isEmpty()) {
                exists = true;
                break;
            }
        }
        if (!exists) {
            cancelBlackholeCopyResolve();
        }
    }

    m_bgCutoutDirty = true;
    update();
}

void EditorCanvas::setTools(const QVector<core::Project::Tool>& tools, const QVector<double>& opacities01) {
    m_tools.clear();
    // 需要用深度图为工具采样一个“近远”用于同优先级排序（与实体一致）
    if (!m_depthAbsPath.isEmpty()) {
        if (m_depthDirty) {
            m_depthDirty = false;
            m_depthImage8 = core::image_file::loadDepthMapAlignedToBackground(m_depthAbsPath, m_bgAbsPath);
        }
    }
    const qsizetype n = tools.size();
    m_tools.reserve(n);
    for (qsizetype i = 0; i < n; ++i) {
        ToolView tv;
        tv.tool = tools[i];
        tv.opacity = (i < opacities01.size()) ? std::clamp(opacities01[i], 0.0, 1.0) : 1.0;
        tv.depthZ = (!m_depthImage8.isNull()) ? sampleDepthAtPoint(m_depthImage8, tv.tool.originWorld) : 0;
        m_tools.push_back(tv);
    }
    // 轨道变更：若当前选中的工具已不存在，则清除
    if (m_selectedTool >= 0) {
        const QString selId = (m_selectedTool >= 0 && m_selectedTool < m_tools.size()) ? m_tools[m_selectedTool].tool.id : QString();
        if (!selId.isEmpty()) {
            int hit = -1;
            for (int i = 0; i < m_tools.size(); ++i) {
                if (m_tools[i].tool.id == selId) {
                    hit = i;
                    break;
                }
            }
            m_selectedTool = hit;
        } else {
            m_selectedTool = -1;
        }
    }
    update();
}

void EditorCanvas::setCameraOverlays(const QVector<core::Project::Camera>& cameras,
                                     const QString& selectedId,
                                     const QSet<QString>& tempHiddenCameraIds) {
    const bool hadSelectedCamera = !m_selectedCameraId.isEmpty() || m_selectedCameraIndex >= 0 || m_draggingCamera;
    m_cameraOverlays = cameras;
    m_tempHiddenCameraIds = tempHiddenCameraIds;
    m_selectedCameraId = selectedId;
    m_selectedCameraIndex = -1;
    if (!selectedId.isEmpty()) {
        for (int i = 0; i < m_cameraOverlays.size(); ++i) {
            if (m_cameraOverlays[i].id == selectedId) {
                m_selectedCameraIndex = i;
                break;
            }
        }
    }
    if (m_selectedCameraIndex < 0) {
        m_selectedCameraId.clear();
        m_draggingCamera = false;
        if (hadSelectedCamera) {
            emit selectedCameraChanged(false, QString(), QPointF(), 1.0);
        }
    }
    update();
}

void EditorCanvas::selectCameraById(const QString& id) {
    if (id.isEmpty()) {
        clearCameraSelection();
        return;
    }
    clearEntitySelection();
    m_selectedTool = -1;
    m_draggingTool = false;
    emit selectedToolChanged(false, QString(), QPointF());
    clearBlackholeSelection();
    for (int i = 0; i < m_cameraOverlays.size(); ++i) {
        if (m_cameraOverlays[i].id == id) {
            m_selectedCameraIndex = i;
            m_selectedCameraId = id;
            const auto& c = m_cameraOverlays[i];
            emit selectedCameraChanged(true, id, c.centerWorld, c.viewScale);
            update();
            return;
        }
    }
    clearCameraSelection();
}

void EditorCanvas::clearCameraSelection() {
    if (m_selectedCameraId.isEmpty() && m_selectedCameraIndex < 0 && !m_draggingCamera) {
        return;
    }
    m_selectedCameraId.clear();
    m_selectedCameraIndex = -1;
    m_draggingCamera = false;
    emit selectedCameraChanged(false, QString(), QPointF(), 1.0);
    update();
}

void EditorCanvas::setTempHiddenIds(const QSet<QString>& entityIds, const QSet<QString>& toolIds) {
    m_tempHiddenEntityIds = entityIds;
    m_tempHiddenToolIds = toolIds;
    update();
}

void EditorCanvas::setTempHiddenCameraIds(const QSet<QString>& cameraIds) {
    m_tempHiddenCameraIds = cameraIds;
    update();
}

void EditorCanvas::setCurrentFrame(int frame) {
    if (m_currentFrame == frame) {
        return;
    }
    m_currentFrame = std::max(0, frame);
    // 仅切帧时，实体由 MainWindow 刷新时回灌；这里也触发重绘用于坐标轴/叠加
    update();
}

QPointF EditorCanvas::selectedAnimatedOriginWorld() const {
    return selectedEntityPivotWorld();
}

QPointF EditorCanvas::selectedEntityPivotWorld() const {
    if (m_selectedEntity < 0 || m_selectedEntity >= m_entities.size()) {
        return {};
    }
    return m_entities[m_selectedEntity].animatedOriginWorld;
}

double EditorCanvas::selectedDepthScale01() const {
    if (m_selectedEntity < 0 || m_selectedEntity >= m_entities.size()) {
        return 0.5;
    }
    return m_entities[m_selectedEntity].animatedDepthScale01;
}

QPointF EditorCanvas::selectedEntityCentroidWorld() const {
    if (m_selectedEntity < 0 || m_selectedEntity >= m_entities.size()) {
        return {};
    }
    // 拖动预览：polygonWorld 不再逐点更新，质心应使用预览值，否则属性面板看起来“不跟随”
    if (!m_presentationPreviewMode && m_draggingEntity && m_dragPreviewActive && m_selectedEntity >= 0) {
        return m_dragCentroidBase + m_dragDelta;
    }
    const auto& ent = m_entities[m_selectedEntity];
    if (!ent.polygonWorld.isEmpty()) {
        return entity_cutout::polygonCentroid(ent.polygonWorld);
    }
    return ent.rect.center();
}

double EditorCanvas::selectedDistanceScaleMultiplier() const {
    if (m_selectedEntity < 0 || m_selectedEntity >= m_entities.size()) {
        return 1.0;
    }
    const auto& ent = m_entities[m_selectedEntity];
    return ent.ignoreDistanceScale ? 1.0 : distanceScaleFromDepth01(ent.animatedDepthScale01, ent.distanceScaleCalibMult);
}

double EditorCanvas::selectedUserScale() const {
    if (m_selectedEntity < 0 || m_selectedEntity >= m_entities.size()) {
        return 1.0;
    }
    return m_entities[m_selectedEntity].userScale;
}

double EditorCanvas::selectedCombinedScale() const {
    return selectedDistanceScaleMultiplier() * selectedUserScale();
}

void EditorCanvas::tickPresentationHoverAnimation() {
    if (!m_presentationPreviewMode) {
        return;
    }
    m_presHoverPhase += 0.35;
    if (m_presHoverPhase > 6.28318530718) {
        m_presHoverPhase -= 6.28318530718;
    }
    update();
}

void EditorCanvas::tickPresentationZoomAnimation() {
    m_presZoomAnimT += 0.16;
    qreal u = std::min(1.0, static_cast<qreal>(m_presZoomAnimT));
    u = 1.0 - std::pow(1.0 - u, 3.0);
    m_pan = m_presZoomFromPan + (m_presZoomToPan - m_presZoomFromPan) * u;
    m_scale = m_presZoomFromScale + (m_presZoomToScale - m_presZoomFromScale) * u;
    if (m_presZoomAnimT >= 1.0) {
        m_presZoomTimer->stop();
        m_pan = m_presZoomToPan;
        m_scale = m_presZoomToScale;
        if (m_presZoomFinishingRestore) {
            m_presFocusedEntityIndex = -1;
            m_presZoomFinishingRestore = false;
        }
    }
    update();
}

void EditorCanvas::presentationComputeZoomTarget(int entityIndex, QPointF* outPan, qreal* outScale) const {
    if (!outPan || !outScale || entityIndex < 0 || entityIndex >= m_entities.size()) {
        return;
    }
    const Entity& ent = m_entities[entityIndex];
    QRectF bb;
    if (!ent.image.isNull()) {
        const QSizeF sz(ent.image.width() * ent.visualScale, ent.image.height() * ent.visualScale);
        bb = QRectF(ent.imageTopLeft, sz);
    } else if (!ent.polygonWorld.isEmpty()) {
        bb = entity_cutout::pathFromWorldPolygon(ent.polygonWorld).boundingRect();
    } else {
        bb = ent.rect;
    }
    const QPointF c = bb.center();
    const qreal rw = std::max(1.0, bb.width());
    const qreal rh = std::max(1.0, bb.height());
    qreal s = std::min(static_cast<qreal>(width()) / (rw * 1.28), static_cast<qreal>(height()) / (rh * 1.28));
    s = std::clamp(s, 0.12, 14.0);
    *outScale = s;
    *outPan = QPointF(width() / 2.0, height() / 2.0) - c * s;
}

void EditorCanvas::beginPresentationZoomTowardEntity(int entityIndex) {
    if (entityIndex < 0 || entityIndex >= m_entities.size()) {
        return;
    }
    if (m_presFocusedEntityIndex < 0) {
        m_presRestorePan = m_pan;
        m_presRestoreScale = m_scale;
    }
    m_presFocusedEntityIndex = entityIndex;
    m_presZoomFromPan = m_pan;
    m_presZoomFromScale = m_scale;
    presentationComputeZoomTarget(entityIndex, &m_presZoomToPan, &m_presZoomToScale);
    m_presZoomAnimT = 0.0;
    m_presZoomFinishingRestore = false;
    m_presZoomTimer->start();
}

void EditorCanvas::beginPresentationZoomRestore() {
    m_presZoomFromPan = m_pan;
    m_presZoomFromScale = m_scale;
    m_presZoomToPan = m_presRestorePan;
    m_presZoomToScale = m_presRestoreScale;
    m_presZoomAnimT = 0.0;
    m_presZoomFinishingRestore = true;
    m_presZoomTimer->start();
}

void EditorCanvas::clearPresentationEntityFocus() {
    emit presentationInteractionDismissed();
    if (m_presZoomFinishingRestore) {
        return;
    }
    if (m_presFocusedEntityIndex >= 0) {
        beginPresentationZoomRestore();
    }
}

void EditorCanvas::clearEntitySelection() {
    if (m_selectedEntity < 0) {
        return;
    }
    m_selectedEntity = -1;
    emit selectedEntityChanged(false, QString(), 0, QPointF());
    update();
}

void EditorCanvas::selectEntityById(const QString& id) {
    if (id.isEmpty()) {
        clearEntitySelection();
        clearCameraSelection();
        return;
    }
    clearCameraSelection();
    for (int i = 0; i < m_entities.size(); ++i) {
        if (m_entities[i].id != id) {
            continue;
        }
        if (m_selectedEntity == i) {
            update();
            return;
        }
        m_selectedEntity = i;
        const auto& ent = m_entities[i];
        const QPointF origin =
            ent.polygonWorld.isEmpty() ? ent.rect.center() : entity_cutout::polygonCentroid(ent.polygonWorld);
        emit selectedEntityChanged(true, ent.id, ent.depth, origin);
        update();
        return;
    }
    clearEntitySelection();
}

void EditorCanvas::selectBlackholeByEntityId(const QString& entityId) {
    if (entityId.isEmpty()) {
        clearBlackholeSelection();
        return;
    }
    for (const auto& ent : m_entities) {
        if (ent.id == entityId && !ent.cutoutPolygonWorld.isEmpty()) {
            if (m_selectedBlackholeEntityId == entityId) {
                update();
                return;
            }
            m_selectedBlackholeEntityId = entityId;
            update();
            return;
        }
    }
    clearBlackholeSelection();
}

void EditorCanvas::clearBlackholeSelection() {
    if (m_blackholeCopyResolveActive) {
        cancelBlackholeCopyResolve();
    }
    if (m_selectedBlackholeEntityId.isEmpty()) {
        return;
    }
    m_selectedBlackholeEntityId.clear();
    update();
}

bool EditorCanvas::startBlackholeCopyResolve(const QString& entityId) {
    if (entityId.isEmpty()) {
        return false;
    }
    const Entity* hit = nullptr;
    for (const auto& ent : m_entities) {
        if (ent.id == entityId && !ent.cutoutPolygonWorld.isEmpty()) {
            hit = &ent;
            break;
        }
    }
    if (!hit) {
        return false;
    }
    ensurePixmapLoaded();
    const QRectF bg = worldRectOfBackground();
    if (bg.isNull()) {
        return false;
    }

    QRectF holeRect = entity_cutout::pathFromWorldPolygon(hit->cutoutPolygonWorld).boundingRect();
    if (holeRect.isNull()) {
        return false;
    }
    if (holeRect.width() < 1.0 || holeRect.height() < 1.0) {
        return false;
    }
    holeRect = holeRect.intersected(bg);
    if (holeRect.isNull()) {
        return false;
    }

    QRectF srcRect(holeRect);
    const qreal shift = std::max<qreal>(24.0, holeRect.width() * 0.6);
    srcRect.translate(shift, 0.0);
    srcRect = clampRectTopLeftToBounds(srcRect, bg);

    m_bhCopyPatchValid = false;
    m_bhCopyPatch = QImage();
    if (m_useViewportLod && !m_bgAbsPath.isEmpty()) {
        QRect uni =
            holeRect.united(srcRect).toAlignedRect().intersected(bg.toAlignedRect());
        if (uni.isValid() && uni.width() > 0 && uni.height() > 0 &&
            core::image_file::loadRegionToQImage(m_bgAbsPath, uni, 8192, 8192, &m_bhCopyPatch) &&
            !m_bhCopyPatch.isNull()) {
            if (m_bhCopyPatch.format() != QImage::Format_ARGB32_Premultiplied) {
                m_bhCopyPatch = m_bhCopyPatch.convertToFormat(QImage::Format_ARGB32_Premultiplied);
            }
            m_bhCopyPatchOrigin = uni.topLeft();
            m_bhCopyPatchValid = true;
        }
    }
    if (!m_bhCopyPatchValid && m_bgImageDirty) {
        m_bgImageDirty = false;
        m_bgImage = readImageTolerant(m_bgAbsPath);
        if (m_bgImage.format() != QImage::Format_ARGB32_Premultiplied && !m_bgImage.isNull()) {
            m_bgImage = m_bgImage.convertToFormat(QImage::Format_ARGB32_Premultiplied);
        }
    }

    m_selectedBlackholeEntityId = entityId;
    m_blackholeCopyResolveActive = true;
    m_blackholeCopyEntityId = entityId;
    m_blackholeCopyHoleRect = holeRect;
    m_blackholeCopySourceRect = srcRect;
    m_blackholeCopyDragging = false;
    m_blackholeCopyDragOffset = QPointF();
    updateCursor();
    update();
    return true;
}

void EditorCanvas::cancelBlackholeCopyResolve() {
    if (!m_blackholeCopyResolveActive) {
        return;
    }
    m_bhCopyPatchValid = false;
    m_bhCopyPatch = QImage();
    m_blackholeCopyResolveActive = false;
    m_blackholeCopyEntityId.clear();
    m_blackholeCopyHoleRect = QRectF();
    m_blackholeCopySourceRect = QRectF();
    m_blackholeCopyDragging = false;
    m_blackholeCopyDragOffset = QPointF();
    updateCursor();
    update();
}

void EditorCanvas::notifyBackgroundContentChanged() {
    // 背景路径不变时，setBackgroundImagePath 不会触发刷新；这里显式让 pixmap/image 缓存失效并重载。
    invalidatePixmap();
    m_bgImageDirty = true;
    m_bgCutoutDirty = true;
    update();
}

void EditorCanvas::notifyBlackholeOverlaysChanged() {
    m_blackholeOverlayImageCache.clear();
    update();
}

void EditorCanvas::setBackgroundImagePath(const QString& absolutePath) {
    if (m_bgAbsPath == absolutePath) {
        return;
    }
    cancelBlackholeCopyResolve();
    m_bgAbsPath = absolutePath;
    m_initialBgLoadFinishedEmitted = false;
    invalidatePixmap();
    m_bgImageDirty = true;
    m_bgCutoutDirty = true;
    m_bgImage = QImage();
    m_bgImageCutout = QImage();
    zoomToFit();
    update();
    tryEmitInitialBackgroundLoadFinished();
}

void EditorCanvas::tryEmitInitialBackgroundLoadFinished() {
    if (m_initialBgLoadFinishedEmitted) {
        return;
    }
    if (m_bgAbsPath.isEmpty()) {
        m_initialBgLoadFinishedEmitted = true;
        emit initialBackgroundLoadFinished();
        return;
    }
    ensurePixmapLoaded();
    if (m_useViewportLod) {
        if (!m_bgViewportImage.isNull()) {
            m_initialBgLoadFinishedEmitted = true;
            emit initialBackgroundLoadFinished();
        }
        return;
    }
    m_initialBgLoadFinishedEmitted = true;
    emit initialBackgroundLoadFinished();
}

void EditorCanvas::setBackgroundVisible(bool on) {
    if (m_backgroundVisible == on) {
        return;
    }
    m_backgroundVisible = on;
    update();
}

void EditorCanvas::setDepthMapPath(const QString& absolutePath) {
    if (m_depthAbsPath == absolutePath) {
        return;
    }
    m_depthAbsPath = absolutePath;
    m_depthDirty = true;
    m_depthImage8 = QImage();
    update();
}

void EditorCanvas::setDepthOverlayEnabled(bool on) {
    if (m_depthOverlayEnabled == on) {
        return;
    }
    m_depthOverlayEnabled = on;
    update();
}

void EditorCanvas::setTool(Tool tool) {
    if (m_tool == tool) {
        return;
    }
    m_tool = tool;
    m_draggingEntity = false;
    m_drawingEntity = false;
    m_strokeWorld.clear();
    updateCursor();
    update();
}

void EditorCanvas::setEntityCreateSegmentMode(EntityCreateSegmentMode m) {
    if (m_entityCreateSegmentMode == m) {
        return;
    }
    m_entityCreateSegmentMode = m;
    update();
}

void EditorCanvas::setPendingEntityPolygonWorld(const QVector<QPointF>& polyWorld) {
    m_pendingPolyWorld = polyWorld;
    m_pendingDragging = false;
    m_pendingDragWhole = false;
    m_pendingDragVertex = -1;
    update();
}

void EditorCanvas::clearPendingEntityPolygon() {
    m_pendingPolyWorld.clear();
    m_pendingDragging = false;
    m_pendingDragWhole = false;
    m_pendingDragVertex = -1;
    update();
}

bool EditorCanvas::isPointNearPendingVertex(const QPointF& worldPos, int* outIndex) const {
    if (outIndex) *outIndex = -1;
    if (m_pendingPolyWorld.size() < 3) return false;
    const qreal rView = 10.0;
    const qreal rWorld = rView / std::max<qreal>(m_scale, 0.001);
    const qreal r2 = rWorld * rWorld;
    int best = -1;
    qreal bestD2 = r2;
    for (int i = 0; i < m_pendingPolyWorld.size(); ++i) {
        const QPointF d = m_pendingPolyWorld[i] - worldPos;
        const qreal d2 = d.x() * d.x() + d.y() * d.y();
        if (d2 <= bestD2) {
            bestD2 = d2;
            best = i;
        }
    }
    if (best >= 0) {
        if (outIndex) *outIndex = best;
        return true;
    }
    return false;
}

bool EditorCanvas::pendingPolygonContains(const QPointF& worldPos) const {
    if (m_pendingPolyWorld.size() < 3) return false;
    return entity_cutout::pathFromWorldPolygon(m_pendingPolyWorld).contains(worldPos);
}

void EditorCanvas::resetView() {
    m_scale = 1.0;
    m_pan = QPointF(0, 0);
    invalidateViewportLod();
    update();
}

void EditorCanvas::zoomToFit() {
    ensurePixmapLoaded();
    if ((!m_bgLogicalSize.isValid() && m_bgPixmap.isNull()) || width() <= 1 || height() <= 1) {
        resetView();
        return;
    }

    const QSizeF viewSize = size();
    const QSizeF imgSize =
        m_bgLogicalSize.isValid() ? QSizeF(m_bgLogicalSize) : QSizeF(m_bgPixmap.size());
    const qreal sx = (viewSize.width() - 24.0) / imgSize.width();
    const qreal sy = (viewSize.height() - 24.0) / imgSize.height();
    const qreal s = std::max<qreal>(kViewScaleMin, std::min(sx, sy));

    m_scale = s;
    // 让 world(0,0) 的图像左上角居中显示
    const QSizeF draw(imgSize.width() * s, imgSize.height() * s);
    m_pan = QPointF((viewSize.width() - draw.width()) / 2.0, (viewSize.height() - draw.height()) / 2.0);
    invalidateViewportLod();
    update();
}

void EditorCanvas::setWorldAxesVisible(bool on) {
    if (m_worldAxesVisible == on) {
        return;
    }
    m_worldAxesVisible = on;
    update();
}

void EditorCanvas::setAxisLabelsVisible(bool on) {
    if (m_axisLabelsVisible == on) {
        return;
    }
    m_axisLabelsVisible = on;
    update();
}

void EditorCanvas::setGizmoLabelsVisible(bool on) {
    if (m_gizmoLabelsVisible == on) {
        return;
    }
    m_gizmoLabelsVisible = on;
    update();
}

void EditorCanvas::setGridVisible(bool on) {
    if (m_gridVisible == on) {
        return;
    }
    m_gridVisible = on;
    update();
}

void EditorCanvas::setCheckerboardVisible(bool on) {
    if (m_checkerboardVisible == on) {
        return;
    }
    m_checkerboardVisible = on;
    update();
}

void EditorCanvas::invalidatePixmap() {
    m_pixmapDirty = true;
    m_bgPixmap = QPixmap();
    m_bgLogicalSize = QSize();
    m_useViewportLod = false;
    m_bgViewportImage = QImage();
    m_bgViewportCacheRect = QRect();
    m_bgViewportDirty = true;
    m_vpCachedDensity = 0.0;
    m_vpPreferRegionDecode = false;
    ++m_vpToken;
}

void EditorCanvas::invalidateViewportLod() {
    m_bgViewportDirty = true;
    ++m_vpToken;
}

void EditorCanvas::syncFullBackgroundImageFromDiskIfDirty() {
    if (m_bgAbsPath.isEmpty() || m_useViewportLod) {
        return;
    }
    if (!m_bgImageDirty) {
        return;
    }
    m_bgImageDirty = false;
    m_bgImage = readImageTolerant(m_bgAbsPath);
    if (!m_bgImage.isNull() && m_bgImage.format() != QImage::Format_ARGB32_Premultiplied) {
        m_bgImage = m_bgImage.convertToFormat(QImage::Format_ARGB32_Premultiplied);
    }
    m_bgCutoutDirty = true;
}

void EditorCanvas::rebuildFullBackgroundCutoutIfDirty() {
    if (m_useViewportLod || m_bgAbsPath.isEmpty()) {
        return;
    }
    if (!m_bgCutoutDirty) {
        return;
    }
    if (m_bgImage.isNull()) {
        syncFullBackgroundImageFromDiskIfDirty();
    }
    if (m_bgImage.isNull()) {
        return;
    }
    m_bgCutoutDirty = false;
    m_bgImageCutout = m_bgImage;
    for (const auto& ent : m_entities) {
        if (ent.blackholeVisible && !ent.cutoutPolygonWorld.isEmpty()) {
            entity_cutout::applyBlackFillToBackground(m_bgImageCutout, ent.cutoutPolygonWorld);
        }
    }
}

QVector<QVector<QPointF>> EditorCanvas::visibleBlackholeCutoutPolysWorld() const {
    QVector<QVector<QPointF>> out;
    for (const auto& ent : m_entities) {
        if (ent.blackholeVisible && ent.cutoutPolygonWorld.size() >= 3) {
            out.push_back(ent.cutoutPolygonWorld);
        }
    }
    return out;
}

void EditorCanvas::applyBlackHolesWorldToCrop(QImage& cropPremul, const QRect& cropWorld) const {
    entity_cutout::applyBlackHolesToImageRegion(cropPremul, cropWorld, visibleBlackholeCutoutPolysWorld());
}

bool EditorCanvas::loadRgbCropForEntitySegmentStroke(const QRectF& polyBrWorld, QRect& outCropWorld,
                                                     QImage& outCropRgb) {
    outCropRgb = QImage();
    if (m_bgAbsPath.isEmpty()) {
        return false;
    }
    ensurePixmapLoaded();
    QRect cropWorld = entity_cutout::clampRectToImage(
        polyBrWorld.adjusted(-kSamCropMargin, -kSamCropMargin, kSamCropMargin, kSamCropMargin).toAlignedRect(),
        QSize(backgroundLogicalWidth(), backgroundLogicalHeight()));
    if (cropWorld.isEmpty()) {
        return false;
    }
    outCropWorld = cropWorld;

    if (!m_useViewportLod) {
        syncFullBackgroundImageFromDiskIfDirty();
        rebuildFullBackgroundCutoutIfDirty();
        if (!m_bgImageCutout.isNull()) {
            outCropRgb = m_bgImageCutout.copy(cropWorld);
        }
    }
    if (outCropRgb.isNull()) {
        (void)core::image_file::loadRegionToQImage(m_bgAbsPath, cropWorld, 4096, 4096, &outCropRgb);
        if (!outCropRgb.isNull() && outCropRgb.format() != QImage::Format_ARGB32_Premultiplied) {
            outCropRgb = outCropRgb.convertToFormat(QImage::Format_ARGB32_Premultiplied);
        }
    }
    if (outCropRgb.isNull() && !m_bgImage.isNull()) {
        const QRect cw = entity_cutout::clampRectToImage(
            polyBrWorld.adjusted(-kSamCropMargin, -kSamCropMargin, kSamCropMargin, kSamCropMargin).toAlignedRect(),
            m_bgImage.size());
        if (!cw.isEmpty()) {
            outCropRgb = m_bgImage.copy(cw);
            outCropWorld = cw;
        }
    }
    if (outCropRgb.isNull()) {
        syncFullBackgroundImageFromDiskIfDirty();
        rebuildFullBackgroundCutoutIfDirty();
        if (!m_bgImage.isNull()) {
            const QRect cw2 = entity_cutout::clampRectToImage(
                polyBrWorld.adjusted(-kSamCropMargin, -kSamCropMargin, kSamCropMargin, kSamCropMargin).toAlignedRect(),
                m_bgImage.size());
            if (!cw2.isEmpty()) {
                outCropRgb = m_bgImage.copy(cw2);
                outCropWorld = cw2;
            }
        }
    }
    if (outCropRgb.isNull()) {
        return false;
    }
    if (outCropRgb.format() != QImage::Format_ARGB32_Premultiplied) {
        outCropRgb = outCropRgb.convertToFormat(QImage::Format_ARGB32_Premultiplied);
    }
    applyBlackHolesWorldToCrop(outCropRgb, outCropWorld);
    return true;
}

void EditorCanvas::ensurePixmapLoaded() const {
    if (!m_pixmapDirty) {
        return;
    }
    m_pixmapDirty = false;
    m_bgPixmap = QPixmap();
    m_bgLogicalSize = QSize();
    m_useViewportLod = false;
    if (m_bgAbsPath.isEmpty()) {
        return;
    }

    if (core::VipsBackend::isAvailable() &&
        core::image_file::probeImagePixelSize(m_bgAbsPath, &m_bgLogicalSize) && m_bgLogicalSize.isValid()) {
        m_useViewportLod = true;
        m_bgViewportDirty = true;
        m_bgImageDirty = true;
        m_bgCutoutDirty = true;
        return;
    }

    const QImage img = readImageTolerant(m_bgAbsPath);
    if (!img.isNull()) {
        m_bgPixmap = QPixmap::fromImage(img);
        m_bgLogicalSize = img.size();
    }
    m_bgImageDirty = true;
    m_bgCutoutDirty = true;
}

void EditorCanvas::ensureBackgroundViewport() {
    if (!m_useViewportLod || m_bgAbsPath.isEmpty() || !m_bgLogicalSize.isValid()) {
        return;
    }

    const QRectF bgRect(0, 0, m_bgLogicalSize.width(), m_bgLogicalSize.height());
    QRectF vis = visibleWorldRectF().intersected(bgRect);
    if (vis.isEmpty()) {
        m_bgViewportImage = QImage();
        m_bgViewportCacheRect = QRect();
        m_bgViewportDirty = false;
        m_vpDecodeInFlight = false;
        return;
    }

    const QRect visI = vis.toAlignedRect();
    const qreal pr = devicePixelRatio();
    const qreal density = static_cast<qreal>(m_scale) * pr;
    const bool previewCameraHighQ = m_presentationPreviewMode && m_previewCameraViewLocked;
    const qreal decodeBoost = previewCameraHighQ ? 1.35 : 1.0;
    // 视口背景在屏幕上通常会经历一次缩放（世界坐标 -> 视图像素）。
    // 为了减少“发糊”，静止时做适度超采样：用更高分辨率解码，再由绘制阶段缩小。
    // 拖拽交互时降低超采样，优先帧率。
    const qreal superSample = m_draggingEntity ? 1.15 : (previewCameraHighQ ? 1.75 : 1.55);
    const qreal densityTol = previewCameraHighQ ? 0.045 : 0.09;

    // 缓存仍覆盖视口且清晰度档位未变：直接复用（避免 invalidateViewportLod 仅置 dirty 又触发二次解码失败把画面清空）
    // m_vpPreferRegionDecode 时不短路：必须在缩略图显示后立刻做一次区域细化
    if (!m_vpPreferRegionDecode && !m_bgViewportImage.isNull() && m_bgViewportCacheRect.contains(visI) &&
        m_vpCachedDensity > 1e-9 &&
        std::abs(density - m_vpCachedDensity) / m_vpCachedDensity < densityTol) {
        m_bgViewportDirty = false;
        return;
    }

    if (m_vpDecodeInFlight.exchange(true)) {
        return;
    }

    const QString path = m_bgAbsPath;
    const QSize logicalSize = m_bgLogicalSize;
    const uint32_t myToken = m_vpToken.load(std::memory_order_relaxed);

    const qint64 imgArea = qint64(logicalSize.width()) * qint64(logicalSize.height());
    const qint64 visArea = qint64(visI.width()) * qint64(visI.height());
    // 预览且镜头锁定时禁用全图缩略路径，避免画面明显发糊
    const bool overviewMode =
        !m_vpPreferRegionDecode && !previewCameraHighQ && imgArea > 0 &&
        (static_cast<double>(visArea) / static_cast<double>(imgArea) >= 0.68) &&
        core::VipsBackend::isAvailable();

    // 扩大解码缓存：平移时尽量仍在同一张纹理内，避免每帧触发新的后台解码导致卡顿
    const qreal screenWorldW = (static_cast<qreal>(width()) * pr) / std::max(m_scale, static_cast<qreal>(1e-9));
    const qreal screenWorldH = (static_cast<qreal>(height()) * pr) / std::max(m_scale, static_cast<qreal>(1e-9));
    const qreal padX = std::max(vis.width() * 0.95, screenWorldW * 0.75);
    const qreal padY = std::max(vis.height() * 0.95, screenWorldH * 0.75);
    QRect req =
        vis.adjusted(-padX, -padY, padX, padY).toAlignedRect().intersected(bgRect.toAlignedRect());
    if (req.width() <= 0 || req.height() <= 0) {
        m_vpDecodeInFlight = false;
        if (m_bgViewportImage.isNull()) {
            m_bgViewportCacheRect = QRect();
        }
        m_bgViewportDirty = false;
        return;
    }

    // 关键：解码目标分辨率必须以“req 区域在当前缩放下投影到屏幕的像素数”为基准。
    // 否则后台解码完成后替换纹理时，画面会因为额外的 drawImage 缩放而突然变糊。
    const int maxW = std::clamp(static_cast<int>(std::ceil(req.width() * density * superSample * decodeBoost)), 256, 8192);
    const int maxH = std::clamp(static_cast<int>(std::ceil(req.height() * density * superSample * decodeBoost)), 256, 8192);

    const qint64 budget =
        qint64(maxW) * qint64(maxH) * (overviewMode ? 2 : 1);  // 缩略图阶段提高像素预算，减少首帧模糊感

    (void)QtConcurrent::run([this, path, logicalSize, req, maxW, maxH, budget, density, overviewMode,
                             myToken]() {
        QImage img;
        bool ok = false;
        if (overviewMode) {
            ok = core::VipsBackend::loadThumbnailQImage(path, budget, &img) && !img.isNull();
        }
        if (!ok) {
            ok = core::image_file::loadRegionToQImage(path, req, maxW, maxH, &img) && !img.isNull();
        }

        QPointer<EditorCanvas> self(this);
        QTimer::singleShot(
            0,
            this,
            [self, myToken, path, img = std::move(img), ok, logicalSize, req, density, overviewMode]() mutable {
                if (!self) {
                    return;
                }
                self->m_vpDecodeInFlight = false;
                if (myToken != self->m_vpToken.load(std::memory_order_relaxed)) {
                    self->update();
                    return;
                }
                if (path != self->m_bgAbsPath) {
                    self->update();
                    return;
                }
                if (!ok || img.isNull()) {
                    // 保留已成功显示过的纹理，避免后续一次失败把整屏打成「加载失败」
                    if (self->m_bgViewportImage.isNull()) {
                        self->m_bgViewportCacheRect = QRect();
                    }
                    self->m_vpPreferRegionDecode = false;
                    self->m_bgViewportDirty = false;
                    self->update();
                    self->tryEmitInitialBackgroundLoadFinished();
                    return;
                }
                if (img.format() != QImage::Format_ARGB32_Premultiplied) {
                    img = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
                }
                self->m_bgViewportImage = std::move(img);
                self->m_bgViewportCacheRect =
                    overviewMode ? QRect(QPoint(0, 0), logicalSize) : req;
                self->m_bgViewportDirty = false;
                self->m_vpCachedDensity = density;
                if (overviewMode) {
                    self->m_vpPreferRegionDecode = true;
                } else {
                    self->m_vpPreferRegionDecode = false;
                }
                self->update();
                self->tryEmitInitialBackgroundLoadFinished();
            });
    });
}

QRectF EditorCanvas::visibleWorldRectF() const {
    const QPointF c0 = viewToWorld(QPointF(0, 0));
    const QPointF c1 = viewToWorld(QPointF(width(), 0));
    const QPointF c2 = viewToWorld(QPointF(width(), height()));
    const QPointF c3 = viewToWorld(QPointF(0, height()));
    const qreal minx = std::min({c0.x(), c1.x(), c2.x(), c3.x()});
    const qreal maxx = std::max({c0.x(), c1.x(), c2.x(), c3.x()});
    const qreal miny = std::min({c0.y(), c1.y(), c2.y(), c3.y()});
    const qreal maxy = std::max({c0.y(), c1.y(), c2.y(), c3.y()});
    QRectF rf(minx, miny, maxx - minx, maxy - miny);
    return rf.normalized();
}

int EditorCanvas::backgroundLogicalWidth() const {
    ensurePixmapLoaded();
    if (m_bgLogicalSize.isValid()) {
        return m_bgLogicalSize.width();
    }
    return m_bgPixmap.isNull() ? 0 : m_bgPixmap.width();
}

int EditorCanvas::backgroundLogicalHeight() const {
    ensurePixmapLoaded();
    if (m_bgLogicalSize.isValid()) {
        return m_bgLogicalSize.height();
    }
    return m_bgPixmap.isNull() ? 0 : m_bgPixmap.height();
}

void EditorCanvas::updateCursor() {
    if (m_blackholeCopyResolveActive) {
        setCursor(m_blackholeCopyDragging ? Qt::ClosedHandCursor : Qt::OpenHandCursor);
        return;
    }
    if (m_presentationPreviewMode) {
        if (!m_presentationHotspotPlaybackTargetEnabled) {
            setCursor(Qt::ArrowCursor);
            return;
        }
        if (m_presHoverEntityIndex >= 0) {
            setCursor(Qt::PointingHandCursor);
        } else {
            setCursor(Qt::OpenHandCursor);
        }
        return;
    }
    switch (m_tool) {
    case Tool::Move:
        setCursor(Qt::OpenHandCursor);
        break;
    case Tool::Zoom:
        setCursor(Qt::CrossCursor);
        break;
    case Tool::CreateEntity:
        setCursor(Qt::CrossCursor);
        break;
    case Tool::AddHotspot:
        setCursor(Qt::CrossCursor);
        break;
    case Tool::MoveHotspot:
        setCursor(Qt::OpenHandCursor);
        break;
    }
}

QPointF EditorCanvas::viewToWorld(const QPointF& v) const {
    if (m_scale <= 0.0) {
        return {};
    }
    return (v - m_pan) / m_scale;
}

QPointF EditorCanvas::worldToView(const QPointF& w) const {
    return w * m_scale + m_pan;
}

QRectF EditorCanvas::worldRectOfBackground() const {
    ensurePixmapLoaded();
    if (m_bgLogicalSize.isValid()) {
        return QRectF(0, 0, m_bgLogicalSize.width(), m_bgLogicalSize.height());
    }
    if (m_bgPixmap.isNull()) {
        return {};
    }
    return QRectF(0, 0, m_bgPixmap.width(), m_bgPixmap.height());
}

int EditorCanvas::hitTestEntity(const QPointF& worldPos) const {
    for (qsizetype i = m_entities.size(); i > 0; --i) {
        const qsizetype idx = i - 1;
        const auto& ent = m_entities[idx];
        if (ent.opacity <= 0.001) {
            continue;
        }
        if (!ent.id.isEmpty() && m_tempHiddenEntityIds.contains(ent.id)) {
            continue;
        }
        if (!ent.polygonWorld.isEmpty()) {
            const QPainterPath path = entity_cutout::pathFromWorldPolygon(ent.polygonWorld);
            if (path.contains(worldPos)) {
                return static_cast<int>(idx);
            }
            continue;
        }
        if (ent.rect.contains(worldPos)) {
            return static_cast<int>(idx);
        }
    }
    return -1;
}

int EditorCanvas::hitTestPresentationHotspot(const QPointF& worldPos) const {
    const QPointF pv = worldToView(worldPos);
    for (int i = static_cast<int>(m_presentationHotspots.size()) - 1; i >= 0; --i) {
        const QPointF cv = worldToView(m_presentationHotspots[i].centerWorld);
        if (QLineF(pv, cv).length() <= 22.0) {
            return i;
        }
    }
    return -1;
}

int EditorCanvas::hitTestHotspotPlayControl(const QPointF& worldPos) const {
    if (!m_presentationHotspotPlaybackTargetEnabled) {
        return -1;
    }
    const QPointF pv = worldToView(worldPos);
    for (int i = static_cast<int>(m_presentationHotspots.size()) - 1; i >= 0; --i) {
        const QPointF cv = worldToView(m_presentationHotspots[i].centerWorld);
        const QPointF playCenter = cv + QPointF(14.0, 0.0);
        if (QLineF(pv, playCenter).length() <= 17.0) {
            return i;
        }
    }
    return -1;
}

void EditorCanvas::paintEvent(QPaintEvent* e) {
    Q_UNUSED(e);

    QPainter p(this);
    p.setRenderHint(QPainter::Antialiasing, false);
    // 拖动时优先保证交互帧率：缩放贴图使用 nearest 以减少开销
    p.setRenderHint(QPainter::SmoothPixmapTransform, !m_draggingEntity);

    const QRect r = rect();
    if (!m_presentationPreviewMode) {
        if (m_checkerboardVisible) {
            drawCheckerboard(p, r);
        }
        if (m_gridVisible) {
            drawGrid(p, r);
        }
    }

    ensurePixmapLoaded();
    if (m_bgAbsPath.isEmpty()) {
        return;
    }
    if (m_useViewportLod) {
        ensureBackgroundViewport();
        if (m_bgViewportImage.isNull()) {
            return;
        }
    } else if (m_bgPixmap.isNull()) {
        tryEmitInitialBackgroundLoadFinished();
        return;
    }

    const bool showBg = m_presentationPreviewMode || m_backgroundVisible;
    if (showBg && !m_useViewportLod) {
        syncFullBackgroundImageFromDiskIfDirty();
        rebuildFullBackgroundCutoutIfDirty();
    }

    // 以“世界坐标”绘制：支持缩放/平移
    p.save();
    QTransform t;
    t.translate(m_pan.x(), m_pan.y());
    t.scale(m_scale, m_scale);
    p.setTransform(t, true);

    const qreal bw = static_cast<qreal>(backgroundLogicalWidth());
    const qreal bh = static_cast<qreal>(backgroundLogicalHeight());

    if (showBg) {
        if (m_useViewportLod) {
            p.drawImage(QRectF(m_bgViewportCacheRect), m_bgViewportImage);
            if (showBg) {
                for (const auto& ent : m_entities) {
                    if (ent.blackholeVisible && !ent.cutoutPolygonWorld.isEmpty()) {
                        p.fillPath(entity_cutout::pathFromWorldPolygon(ent.cutoutPolygonWorld), Qt::black);
                    }
                }
            }
        } else if (m_backgroundVisible || m_presentationPreviewMode) {
            if (!m_bgImageCutout.isNull()) {
                p.drawImage(QPointF(0, 0), m_bgImageCutout);
            } else if (!m_bgImage.isNull()) {
                p.drawImage(QPointF(0, 0), m_bgImage);
            } else {
                p.drawPixmap(QPointF(0, 0), m_bgPixmap);
            }
        }
        if (!m_presentationPreviewMode && m_backgroundVisible && bw > 0 && bh > 0) {
            p.setPen(QPen(QColor(0, 0, 0, 80), 1.0 / std::max<qreal>(m_scale, 0.001)));
            p.drawRect(QRectF(0, 0, bw, bh).adjusted(0, 0, -1, -1));
        }

        if (!m_projectDirAbs.isEmpty()) {
            for (const auto& ent : m_entities) {
                if (ent.blackholeOverlayPath.isEmpty() || ent.blackholeOverlayRect.width() <= 0 ||
                    ent.blackholeOverlayRect.height() <= 0) {
                    continue;
                }
                QImage ovl;
                if (m_blackholeOverlayImageCache.contains(ent.id)) {
                    ovl = m_blackholeOverlayImageCache.value(ent.id);
                } else {
                    const QString abs = QDir(m_projectDirAbs).filePath(ent.blackholeOverlayPath);
                    ovl = readImageTolerant(abs);
                    if (!ovl.isNull() && ovl.format() != QImage::Format_ARGB32_Premultiplied) {
                        ovl = ovl.convertToFormat(QImage::Format_ARGB32_Premultiplied);
                    }
                    if (!ovl.isNull()) {
                        m_blackholeOverlayImageCache.insert(ent.id, ovl);
                    }
                }
                if (ovl.isNull()) {
                    continue;
                }
                p.drawImage(QPointF(ent.blackholeOverlayRect.topLeft()), ovl);
            }
        }
    }

    // 深度叠加（伪彩色）：仅由「叠加深度」开关控制，与是否显示背景无关
    const bool wantDepth =
        !m_presentationPreviewMode && (!m_depthAbsPath.isEmpty()) && m_depthOverlayEnabled;
    if (wantDepth) {
        if (m_depthDirty) {
            m_depthDirty = false;
            m_depthImage8 = core::image_file::loadDepthMapAlignedToBackground(m_depthAbsPath, m_bgAbsPath);
        }
        if (!m_depthImage8.isNull()) {
            const int overlayAlpha = m_backgroundVisible ? m_depthOverlayAlpha : 255;
            const QImage overlay =
                core::DepthService::depthToColormapOverlay(m_depthImage8, overlayAlpha);
            if (!overlay.isNull()) {
                p.drawImage(QPointF(0, 0), overlay);
            } else {
                p.drawImage(QPointF(0, 0), m_depthImage8);
            }
            p.setPen(QPen(QColor(0, 0, 0, 80), 1.0 / std::max<qreal>(m_scale, 0.001)));
            p.drawRect(QRectF(0, 0, m_depthImage8.width(), m_depthImage8.height()).adjusted(0, 0, -1, -1));
        }
    }

    if (!m_presentationPreviewMode && m_blackholeCopyResolveActive &&
        !m_blackholeCopyHoleRect.isNull() && !m_blackholeCopySourceRect.isNull()) {
        const QRect srcRect = m_blackholeCopySourceRect.toAlignedRect();
        const QRect dstRect = m_blackholeCopyHoleRect.toAlignedRect();
        const bool havePreview =
            (m_bhCopyPatchValid && !m_bhCopyPatch.isNull()) || !m_bgImage.isNull();
        if (havePreview && srcRect.isValid() && dstRect.isValid()) {
            QPainterPath holePath;
            for (const auto& ent : m_entities) {
                if (ent.id == m_blackholeCopyEntityId && !ent.cutoutPolygonWorld.isEmpty()) {
                    holePath = entity_cutout::pathFromWorldPolygon(ent.cutoutPolygonWorld);
                    break;
                }
            }
            p.save();
            if (!holePath.isEmpty()) {
                p.setClipPath(holePath);
            }
            p.setOpacity(0.75);
            if (m_bhCopyPatchValid && !m_bhCopyPatch.isNull()) {
                const QRect srcLocal = srcRect.translated(-m_bhCopyPatchOrigin);
                p.drawImage(dstRect.topLeft(), m_bhCopyPatch, srcLocal);
            } else {
                p.drawImage(dstRect.topLeft(), m_bgImage, srcRect);
            }
            p.setOpacity(1.0);
            p.restore();
        }

        p.setBrush(Qt::NoBrush);
        QPen holePen(QColor(255, 120, 0, 220), 2.0 / std::max<qreal>(m_scale, 0.001));
        holePen.setStyle(Qt::DashLine);
        p.setPen(holePen);
        p.drawRect(m_blackholeCopyHoleRect);

        QPen srcPen(QColor(70, 200, 255, 230), 2.0 / std::max<qreal>(m_scale, 0.001));
        p.setPen(srcPen);
        p.drawRect(m_blackholeCopySourceRect);

    }

    struct DrawItem {
        enum class Kind { Entity, Tool };
        Kind kind = Kind::Entity;
        int index = -1;
        int priority = 0;
        int depth = 0;
    };

    QVector<DrawItem> drawOrder;
    drawOrder.reserve(m_entities.size() + m_tools.size());
    for (int i = 0; i < m_entities.size(); ++i) {
        const auto& ent = m_entities[i];
        if (ent.opacity <= 0.001) continue;
        if (!ent.id.isEmpty() && m_tempHiddenEntityIds.contains(ent.id)) continue;
        drawOrder.push_back(DrawItem{DrawItem::Kind::Entity, i, ent.priority, ent.depth});
    }
    for (int i = 0; i < m_tools.size(); ++i) {
        const auto& tv = m_tools[i];
        if (tv.opacity <= 0.001) continue;
        if (!tv.tool.id.isEmpty() && m_tempHiddenToolIds.contains(tv.tool.id)) continue;
        if (tv.tool.type != core::Project::Tool::Type::Bubble) continue;
        drawOrder.push_back(DrawItem{DrawItem::Kind::Tool, i, tv.tool.priority, tv.depthZ});
    }
    // priority 低先画、高后画；同 priority：远先画、近后画
    std::stable_sort(drawOrder.begin(), drawOrder.end(), [](const DrawItem& a, const DrawItem& b) {
        if (a.priority != b.priority) return a.priority < b.priority;
        if (a.depth != b.depth) return a.depth < b.depth;
        if (a.kind != b.kind) return int(a.kind) < int(b.kind);
        return a.index < b.index;
    });

    for (const auto& it : drawOrder) {
        if (it.kind == DrawItem::Kind::Entity) {
            const int i = it.index;
            const auto& ent = m_entities[i];
            const bool isDragPreview =
                (!m_presentationPreviewMode && m_draggingEntity && m_dragPreviewActive && i == m_selectedEntity);
            if (!ent.polygonWorld.isEmpty()) {
                if (!ent.image.isNull()) {
                    if (isDragPreview) {
                        const QPointF cBase = m_dragCentroidBase;
                        p.save();
                        QTransform tr;
                        tr.translate(m_dragDelta.x(), m_dragDelta.y());
                        tr.translate(cBase.x(), cBase.y());
                        tr.scale(m_dragScaleRatio, m_dragScaleRatio);
                        tr.translate(-cBase.x(), -cBase.y());
                        p.setTransform(tr, true);
                        const QSizeF sz(ent.image.width() * m_dragScaleBase, ent.image.height() * m_dragScaleBase);
                        const QRectF target(m_dragImageTopLeftBase, sz);
                        p.drawImage(target, ent.image);
                        p.restore();
                    } else {
                        const qreal pop =
                            (m_presentationPreviewMode && i == m_presFocusedEntityIndex) ? 1.1 : 1.0;
                        const QSizeF sz0(ent.image.width() * ent.visualScale, ent.image.height() * ent.visualScale);
                        QRectF target;
                        if (pop > 1.001) {
                            const QRectF orig(ent.imageTopLeft, sz0);
                            const QPointF cen = orig.center();
                            const QSizeF sz = orig.size() * pop;
                            target = QRectF(QPointF(cen.x() - sz.width() * 0.5, cen.y() - sz.height() * 0.5), sz);
                        } else {
                            target = QRectF(ent.imageTopLeft, sz0);
                        }
                        QImage drawImg = ent.image;
                        if (m_presentationPreviewMode && !ent.image.isNull()) {
                            const qreal pr = devicePixelRatio();
                            const qreal pxW = std::abs(target.width() * m_scale * pr);
                            const qreal pxH = std::abs(target.height() * m_scale * pr);
                            drawImg = entityImageForPresentationDrawLoRes(ent.image, pxW, pxH);
                        }
                        p.drawImage(target, drawImg);
                    }
                } else {
                    const QPolygonF poly(isDragPreview ? QPolygonF(m_dragPolyBase) : QPolygonF(ent.polygonWorld));
                    p.setPen(Qt::NoPen);
                    p.setBrush(ent.color);
                    if (isDragPreview) {
                        const QPointF cBase = m_dragCentroidBase;
                        QTransform tr;
                        tr.translate(m_dragDelta.x(), m_dragDelta.y());
                        tr.translate(cBase.x(), cBase.y());
                        tr.scale(m_dragScaleRatio, m_dragScaleRatio);
                        tr.translate(-cBase.x(), -cBase.y());
                        p.save();
                        p.setTransform(tr, true);
                        p.drawPolygon(poly);
                        p.restore();
                    } else {
                        p.drawPolygon(poly);
                    }
                }
                if (!m_presentationPreviewMode) {
                    p.setBrush(Qt::NoBrush);
                    p.setPen(QPen(QColor(0, 0, 0, 160), 1.0 / std::max<qreal>(m_scale, 0.001)));
                    if (isDragPreview) {
                        const QPointF cBase = m_dragCentroidBase;
                        QTransform tr;
                        tr.translate(m_dragDelta.x(), m_dragDelta.y());
                        tr.translate(cBase.x(), cBase.y());
                        tr.scale(m_dragScaleRatio, m_dragScaleRatio);
                        tr.translate(-cBase.x(), -cBase.y());
                        p.save();
                        p.setTransform(tr, true);
                        p.drawPath(m_dragPathBase);
                        p.restore();
                    } else {
                        p.drawPath(ent.pathWorld);
                    }
                }
            } else {
                p.fillRect(ent.rect, ent.color);
                if (!m_presentationPreviewMode) {
                    p.setPen(QPen(QColor(0, 0, 0, 120), 1.0 / std::max<qreal>(m_scale, 0.001)));
                    p.drawRect(ent.rect);
                }
            }
            if (!m_presentationPreviewMode && i == m_selectedEntity) {
                p.setPen(QPen(QColor(255, 120, 0, 220), 2.0 / std::max<qreal>(m_scale, 0.001)));
                if (!ent.polygonWorld.isEmpty()) {
                    if (isDragPreview) {
                        const QPointF cBase = m_dragCentroidBase;
                        QTransform tr;
                        tr.translate(m_dragDelta.x(), m_dragDelta.y());
                        tr.translate(cBase.x(), cBase.y());
                        tr.scale(m_dragScaleRatio, m_dragScaleRatio);
                        tr.translate(-cBase.x(), -cBase.y());
                        p.save();
                        p.setTransform(tr, true);
                        p.drawPath(m_dragPathBase);
                        p.restore();
                    } else {
                        p.drawPath(ent.pathWorld);
                    }
                } else {
                    p.drawRect(ent.rect.adjusted(-2, -2, 2, 2));
                }
            }
            if (!m_presentationPreviewMode && ent.id == m_selectedBlackholeEntityId && !ent.cutoutPolygonWorld.isEmpty()) {
                p.setBrush(Qt::NoBrush);
                QPen holePen(QColor(70, 200, 255, 230), 2.2 / std::max<qreal>(m_scale, 0.001));
                holePen.setStyle(Qt::DashLine);
                p.setPen(holePen);
                p.drawPath(entity_cutout::pathFromWorldPolygon(ent.cutoutPolygonWorld));
            }
            if (m_presentationPreviewMode && ent.opacity > 0.001) {
                const bool showHover = (i == m_presHoverEntityIndex);
                const bool showFocus = (i == m_presFocusedEntityIndex);
                if (showHover || showFocus) {
                    p.setBrush(Qt::NoBrush);
                    if (showHover) {
                        const qreal pulse = 0.45 + 0.55 * std::sin(static_cast<double>(m_presHoverPhase));
                        const qreal lw =
                            (2.0 + 2.8 * pulse) / std::max(static_cast<qreal>(m_scale), static_cast<qreal>(0.001));
                        p.setPen(QPen(QColor(255, 210, 80, static_cast<int>(65 + 110 * pulse)), lw));
                        if (!ent.pathWorld.isEmpty()) {
                            p.drawPath(ent.pathWorld);
                        } else {
                            p.drawRect(ent.rect);
                        }
                    }
                    if (showFocus) {
                        const qreal lw = 2.8 / std::max(static_cast<qreal>(m_scale), static_cast<qreal>(0.001));
                        p.setPen(QPen(QColor(255, 120, 40, 230), lw));
                        if (!ent.pathWorld.isEmpty()) {
                            p.drawPath(ent.pathWorld);
                        } else {
                            p.drawRect(ent.rect);
                        }
                    }
                }
            }
        } else {
            const int i = it.index;
            const auto& tv = m_tools[i];
            const auto& tool = tv.tool;
            const double opacity = std::clamp(tv.opacity, 0.0, 1.0);

            const BubbleLayoutWorld lay = bubbleLayoutWorld(tool);
            const QPainterPath& path = lay.path;
            const QRectF& body = lay.bodyRect;

            QColor fill(255, 255, 255, int(220 * opacity));
            QColor border(0, 0, 0, int(120 * opacity));
            p.setBrush(fill);
            p.setPen(QPen(border, 1.2 / std::max<qreal>(m_scale, 0.001)));
            p.drawPath(path);

            if (!tool.text.trimmed().isEmpty()) {
                p.setPen(QColor(10, 10, 10, int(230 * opacity)));
                QFont f = p.font();
                f.setPixelSize(std::clamp(tool.fontPx, 8, 120));
                p.setFont(f);
                QTextOption opt;
                opt.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
                if (tool.align == core::Project::Tool::TextAlign::Left) opt.setAlignment(Qt::AlignLeft | Qt::AlignVCenter);
                else if (tool.align == core::Project::Tool::TextAlign::Right) opt.setAlignment(Qt::AlignRight | Qt::AlignVCenter);
                else opt.setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
                const QRectF textRect = body.adjusted(10, 8, -10, -8);
                p.drawText(textRect, tool.text, opt);
            }

            if (!m_presentationPreviewMode && i == m_selectedTool) {
                p.setBrush(Qt::NoBrush);
                p.setPen(QPen(QColor(80, 160, 255, 220), 2.0 / std::max<qreal>(m_scale, 0.001)));
                p.drawPath(path);
            }
        }
    }

    // 摄像机视口框（编辑模式）
    if (!m_presentationPreviewMode) {
        const qreal handleRWorld = 10.0 / std::max(m_scale, 0.001);
        for (int i = 0; i < m_cameraOverlays.size(); ++i) {
            const auto& cam = m_cameraOverlays[i];
            if (!cam.visible || cam.id.isEmpty() || m_tempHiddenCameraIds.contains(cam.id)) {
                continue;
            }
            const QRectF camRect = cameraWorldViewportRect(cam);
            QColor fill(80, 140, 255, 38);
            QColor border(80, 140, 255, 170);
            if (i == m_selectedCameraIndex) {
                border = QColor(255, 170, 60, 230);
                fill = QColor(255, 170, 60, 48);
            }
            p.setBrush(fill);
            p.setPen(QPen(border, 1.5 / std::max(m_scale, 0.001)));
            p.drawRect(camRect);
            p.setBrush(QColor(255, 210, 120, 230));
            p.setPen(QPen(QColor(30, 30, 30, 160), 1.0 / std::max(m_scale, 0.001)));
            p.drawEllipse(cam.centerWorld, handleRWorld, handleRWorld);
        }
    }

    // 创建实体：手绘轨迹预览（world 坐标）
    if (!m_presentationPreviewMode && m_tool == Tool::CreateEntity && m_drawingEntity && m_strokeWorld.size() >= 2) {
        QPen pen(QColor(255, 120, 0, 220), 2.0 / std::max<qreal>(m_scale, 0.001));
        p.setPen(pen);
        p.setBrush(Qt::NoBrush);
        p.drawPolyline(QPolygonF(m_strokeWorld));
        // 提示闭合
        p.setPen(QPen(QColor(255, 120, 0, 140), 1.0 / std::max<qreal>(m_scale, 0.001), Qt::DashLine));
        p.drawLine(m_strokeWorld.first(), m_strokeWorld.last());
    }

    // 待确认实体：多边形预览 + 顶点
    if (!m_presentationPreviewMode && m_pendingPolyWorld.size() >= 3) {
        const qreal lw = 2.5 / std::max<qreal>(m_scale, 0.001);
        p.setPen(QPen(QColor(60, 180, 255, 230), lw));
        p.setBrush(QColor(60, 180, 255, 45));
        const QPainterPath path = entity_cutout::pathFromWorldPolygon(m_pendingPolyWorld);
        p.drawPath(path);
        const qreal vr = 5.0 / std::max<qreal>(m_scale, 0.001);
        p.setPen(QPen(QColor(0, 0, 0, 120), lw));
        p.setBrush(QColor(255, 255, 255, 220));
        for (const QPointF& v : m_pendingPolyWorld) {
            p.drawEllipse(v, vr, vr);
        }
    }

    p.restore();

    // 坐标轴/刻度：绘制在画布最外层，背景越界时贴边显示
    ensurePixmapLoaded();
    if (!m_presentationPreviewMode && m_worldAxesVisible && backgroundLogicalWidth() > 0 &&
        backgroundLogicalHeight() > 0) {
        const QPointF originView = worldToView(QPointF(0, 0));
        const qreal axisX = std::clamp(originView.x(), 0.0, static_cast<qreal>(width()));
        const qreal axisY = std::clamp(originView.y(), 0.0, static_cast<qreal>(height()));

        QPen axisPen(QColor(20, 20, 20, 180));
        axisPen.setWidth(2);
        p.setPen(axisPen);
        p.drawLine(QPointF(0, axisY), QPointF(width(), axisY));   // X 轴（水平）
        p.drawLine(QPointF(axisX, 0), QPointF(axisX, height()));  // Y 轴（垂直）

        // 根据缩放与视口大小动态调整刻度密度：使相邻刻度在屏幕上保持“够密但不挤”的间距
        auto niceStep = [](double raw) -> double {
            if (!(raw > 0.0) || !std::isfinite(raw)) {
                return 1.0;
            }
            const double p10 = std::pow(10.0, std::floor(std::log10(raw)));
            const double m = raw / p10; // 1..10
            double n = 1.0;
            if (m <= 1.0) n = 1.0;
            else if (m <= 2.0) n = 2.0;
            else if (m <= 5.0) n = 5.0;
            else n = 10.0;
            return n * p10;
        };

        const double sView = std::max<double>(0.001, double(m_scale));
        const double targetTickPx = 86.0;              // 目标：相邻刻度约 86px
        const double minTickPx = 44.0;                 // 太密则自动放大 step
        const double stepWorld = std::max(1.0, niceStep(targetTickPx / sView));
        const double stepPx = stepWorld * sView;
        const int labelEvery = (stepPx < minTickPx) ? int(std::ceil(minTickPx / std::max(1.0, stepPx))) : 1;

        auto visibleWorldXRange = [&]() -> std::pair<double, double> {
            const QPointF w0 = viewToWorld(QPointF(0, 0));
            const QPointF w1 = viewToWorld(QPointF(width(), height()));
            double a = std::min<double>(w0.x(), w1.x());
            double b = std::max<double>(w0.x(), w1.x());
            a = std::clamp(a, 0.0, double(backgroundLogicalWidth()));
            b = std::clamp(b, 0.0, double(backgroundLogicalWidth()));
            return {a, b};
        };
        auto visibleWorldYRange = [&]() -> std::pair<double, double> {
            const QPointF w0 = viewToWorld(QPointF(0, 0));
            const QPointF w1 = viewToWorld(QPointF(width(), height()));
            double a = std::min<double>(w0.y(), w1.y());
            double b = std::max<double>(w0.y(), w1.y());
            a = std::clamp(a, 0.0, double(backgroundLogicalHeight()));
            b = std::clamp(b, 0.0, double(backgroundLogicalHeight()));
            return {a, b};
        };

        QPen tickPen(QColor(20, 20, 20, 140));
        tickPen.setWidth(1);
        p.setPen(tickPen);
        if (m_axisLabelsVisible) {
            QFont f = p.font();
            f.setPointSize(std::max(7, f.pointSize() - 1));
            p.setFont(f);
        }

        // X 轴：用 y=0 的世界线映射到 view-x，并把刻度画在 axisY 上
        {
            const auto [xmin, xmax] = visibleWorldXRange();
            const double start = std::floor(xmin / stepWorld) * stepWorld;
            int iTick = 0;
            for (double x = start; x <= xmax + 1e-9; x += stepWorld, ++iTick) {
                const double xc = std::clamp(x, 0.0, double(backgroundLogicalWidth()));
                const QPointF vx = worldToView(QPointF(xc, 0));
            if (vx.x() < -50 || vx.x() > width() + 50) {
                continue;
            }
            const qreal tx = std::clamp(vx.x(), 0.0, static_cast<qreal>(width()));
            p.drawLine(QPointF(tx, axisY), QPointF(tx, axisY + 6));
            if (m_axisLabelsVisible) {
                if (labelEvery <= 1 || (iTick % labelEvery) == 0) {
                    p.drawText(QPointF(tx + 2, axisY + 18), QString::number(int(std::lround(xc))));
                }
            }
            }
        }

        // Y 轴：用 x=0 的世界线映射到 view-y，并把刻度画在 axisX 上
        {
            const auto [ymin, ymax] = visibleWorldYRange();
            const double start = std::floor(ymin / stepWorld) * stepWorld;
            int iTick = 0;
            for (double y = start; y <= ymax + 1e-9; y += stepWorld, ++iTick) {
                const double yc = std::clamp(y, 0.0, double(backgroundLogicalHeight()));
                const QPointF vy = worldToView(QPointF(0, yc));
            if (vy.y() < -50 || vy.y() > height() + 50) {
                continue;
            }
            const qreal ty = std::clamp(vy.y(), 0.0, static_cast<qreal>(height()));
            p.drawLine(QPointF(axisX, ty), QPointF(axisX + 6, ty));
            if (m_axisLabelsVisible) {
                if (labelEvery <= 1 || (iTick % labelEvery) == 0) {
                    p.drawText(QPointF(axisX + 10, ty - 2), QString::number(int(std::lround(yc))));
                }
            }
            }
        }
    }

    // Gizmo：选中实体时显示（仿 Blender：约束 X/Y 轴移动）
    if (!m_presentationPreviewMode && m_selectedEntity >= 0 && m_selectedEntity < m_entities.size()) {
        const auto& ent = m_entities[m_selectedEntity];
        const bool isDragPreview = (m_draggingEntity && m_dragPreviewActive);
        QPointF originWorld = ent.rect.center();
        if (isDragPreview) {
            originWorld = m_dragCentroidBase + m_dragDelta;
        } else if (!ent.polygonWorld.isEmpty()) {
            originWorld = entity_cutout::polygonCentroid(ent.polygonWorld);
        }
        const QPointF originView = worldToView(originWorld);

        // 中心（形心）十字锚点：独立于坐标轴手柄，始终可见
        {
            const qreal h = 7.0;
            QPen outline(QColor(15, 15, 18, 235));
            outline.setWidth(3);
            outline.setCapStyle(Qt::FlatCap);
            QPen core(QColor(255, 248, 220, 252));
            core.setWidth(1);
            core.setCapStyle(Qt::FlatCap);
            p.setPen(outline);
            p.drawLine(QPointF(originView.x() - h, originView.y()), QPointF(originView.x() + h, originView.y()));
            p.drawLine(QPointF(originView.x(), originView.y() - h), QPointF(originView.x(), originView.y() + h));
            p.setPen(core);
            p.drawLine(QPointF(originView.x() - h, originView.y()), QPointF(originView.x() + h, originView.y()));
            p.drawLine(QPointF(originView.x(), originView.y() - h), QPointF(originView.x(), originView.y() + h));
        }

        // 变换原点（枢轴）：与形心不同时显示
        {
            const QPointF pivotWorld = ent.animatedOriginWorld;
            const double sepWorld = QLineF(originWorld, pivotWorld).length();
            if (sepWorld > 0.5) {
                const QPointF pv = worldToView(pivotWorld);
                const qreal pivotDotR = 4.5;
                p.setPen(QPen(QColor(40, 40, 48, 220), 1));
                p.setBrush(QColor(255, 120, 210, 235));
                p.drawEllipse(pv, pivotDotR, pivotDotR);
                p.setBrush(Qt::NoBrush);
            }
        }

        const qreal len = 56.0;
        QPen xPen(QColor(220, 60, 60, 220));
        xPen.setWidth(2);
        QPen yPen(QColor(60, 180, 90, 220));
        yPen.setWidth(2);

        // X 轴（从形心出发，用于拖拽平移）
        p.setPen(xPen);
        p.drawLine(originView, QPointF(originView.x() + len, originView.y()));
        p.drawRect(QRectF(QPointF(originView.x() + len - 4, originView.y() - 4), QSizeF(8, 8)));
        if (m_gizmoLabelsVisible) {
            p.drawText(QPointF(originView.x() + len + 6, originView.y() + 4), QStringLiteral("X"));
        }

        // Y 轴
        p.setPen(yPen);
        p.drawLine(originView, QPointF(originView.x(), originView.y() + len));
        p.drawRect(QRectF(QPointF(originView.x() - 4, originView.y() + len - 4), QSizeF(8, 8)));
        if (m_gizmoLabelsVisible) {
            p.drawText(QPointF(originView.x() + 6, originView.y() + len + 14), QStringLiteral("Y"));
        }
    }

    if (!m_presentationHotspots.isEmpty()) {
        if (m_presentationPreviewMode && m_presentationHotspotPlaybackTargetEnabled) {
            p.setRenderHint(QPainter::Antialiasing, true);
            for (const auto& h : m_presentationHotspots) {
                const QPointF cv = worldToView(h.centerWorld);
                p.setPen(QPen(QColor(255, 248, 220, 235), 2));
                p.setBrush(QColor(30, 34, 42, 170));
                p.drawEllipse(cv, 16.0, 16.0);
                QPolygonF tri;
                tri << (cv + QPointF(-3.0, -6.0)) << (cv + QPointF(-3.0, 6.0)) << (cv + QPointF(8.0, 0.0));
                p.setBrush(QColor(255, 248, 220, 250));
                p.drawPolygon(tri);
            }
            p.setRenderHint(QPainter::Antialiasing, false);
        } else if (m_presentationHotspotEditorActive) {
            p.setRenderHint(QPainter::Antialiasing, true);
            for (const auto& h : m_presentationHotspots) {
                const QPointF cv = worldToView(h.centerWorld);
                const bool sel = (h.id == m_selectedPresentationHotspotId);
                p.setPen(QPen(sel ? QColor(255, 210, 72) : QColor(92, 200, 255), 2));
                p.setBrush(QColor(24, 28, 36, 150));
                p.drawEllipse(cv, 14.0, 14.0);
            }
            p.setRenderHint(QPainter::Antialiasing, false);
        }
    }

    tryEmitInitialBackgroundLoadFinished();
}

void EditorCanvas::resizeEvent(QResizeEvent* e) {
    QWidget::resizeEvent(e);
    invalidateViewportLod();
    update();
}

void EditorCanvas::mousePressEvent(QMouseEvent* e) {
    if (e->button() != Qt::LeftButton && e->button() != Qt::MiddleButton) {
        QWidget::mousePressEvent(e);
        return;
    }

    const QPointF wp0 = viewToWorld(e->position());
    emit hoveredWorldPosChanged(wp0);
    int z0 = -1;
    if (!m_depthAbsPath.isEmpty()) {
        if (m_depthDirty) {
            m_depthDirty = false;
            m_depthImage8 = core::image_file::loadDepthMapAlignedToBackground(m_depthAbsPath, m_bgAbsPath);
        }
        if (!m_depthImage8.isNull()) {
            const int xi = static_cast<int>(std::floor(wp0.x()));
            const int yi = static_cast<int>(std::floor(wp0.y()));
            if (xi >= 0 && yi >= 0 && xi < m_depthImage8.width() && yi < m_depthImage8.height()) {
                z0 = static_cast<int>(m_depthImage8.constScanLine(yi)[xi]);
            }
        }
    }
    emit hoveredWorldPosDepthChanged(wp0, z0);

    if (!m_presentationPreviewMode && m_presentationHotspotEditorActive && e->button() == Qt::LeftButton) {
        if (m_tool == Tool::AddHotspot) {
            emit requestAddPresentationHotspot(wp0);
            e->accept();
            return;
        }
        if (m_tool == Tool::MoveHotspot) {
            const int hi = hitTestPresentationHotspot(wp0);
            if (hi >= 0) {
                m_dragging = true;
                m_draggingHotspotIndex = hi;
                m_hotspotDragOffsetWorld = wp0 - m_presentationHotspots[hi].centerWorld;
                m_selectedPresentationHotspotId = m_presentationHotspots[hi].id;
                m_lastMouseView = e->position();
                setCursor(Qt::ClosedHandCursor);
                emit selectedPresentationHotspotChanged(m_selectedPresentationHotspotId);
            } else {
                m_selectedPresentationHotspotId.clear();
                emit selectedPresentationHotspotChanged(QString());
            }
            update();
            e->accept();
            return;
        }
        if (m_tool == Tool::Move) {
            m_dragging = true;
            m_lastMouseView = e->position();
            setCursor(Qt::ClosedHandCursor);
            e->accept();
            return;
        }
    }

    if (m_blackholeCopyResolveActive) {
        if (e->button() == Qt::LeftButton) {
            QRectF src = m_blackholeCopySourceRect;
            if (!src.contains(wp0)) {
                src.moveCenter(wp0);
                src = clampRectTopLeftToBounds(src, worldRectOfBackground());
                m_blackholeCopySourceRect = src;
            }
            m_blackholeCopyDragging = true;
            m_blackholeCopyDragOffset = wp0 - m_blackholeCopySourceRect.topLeft();
            updateCursor();
            update();
            e->accept();
            return;
        }
        e->accept();
        return;
    }

    if (m_presentationPreviewMode) {
        if (!m_presentationHotspotPlaybackTargetEnabled) {
            e->accept();
            return;
        }
        if (e->button() == Qt::LeftButton) {
            if (m_presentationHotspotPlaybackTargetEnabled) {
                const int playIx = hitTestHotspotPlayControl(wp0);
                if (playIx >= 0 && playIx < m_presentationHotspots.size()) {
                    emit hotspotPlayRequested(m_presentationHotspots[playIx].id);
                    e->accept();
                    return;
                }
            }
            const int hit = hitTestEntity(wp0);
            if (hit >= 0) {
                const auto& ent = m_entities[hit];
                const QPointF cWorld =
                    ent.polygonWorld.isEmpty() ? ent.rect.center() : entity_cutout::polygonCentroid(ent.polygonWorld);
                const QPointF anchorView = worldToView(cWorld);
                beginPresentationZoomTowardEntity(hit);
                emit presentationEntityIntroRequested(ent.id, anchorView);
                return;
            }
            if (!m_previewCameraViewLocked) {
                m_dragging = true;
                m_presBgPanSession = true;
                m_presBgDragDist = 0.0;
                m_lastMouseView = e->position();
                setCursor(Qt::ClosedHandCursor);
            }
            return;
        }
        if (e->button() == Qt::MiddleButton) {
            m_dragging = true;
            m_presBgPanSession = false;
            m_lastMouseView = e->position();
            setCursor(Qt::ClosedHandCursor);
        }
        return;
    }

    if (m_tool == Tool::CreateEntity && e->button() == Qt::LeftButton) {
        // 若已有待确认多边形：进入微调（顶点/整体拖拽），或点击空白直接确认
        if (!m_presentationPreviewMode && m_pendingPolyWorld.size() >= 3) {
            m_dragging = true;
            m_lastMouseView = e->position();
            const QPointF w = viewToWorld(e->position());
            m_pendingLastMouseWorld = w;
            int vi = -1;
            if (isPointNearPendingVertex(w, &vi)) {
                m_pendingDragging = true;
                m_pendingDragVertex = vi;
                m_pendingDragWhole = false;
                e->accept();
                return;
            }
            if (pendingPolygonContains(w)) {
                m_pendingDragging = true;
                m_pendingDragWhole = true;
                m_pendingDragVertex = -1;
                e->accept();
                return;
            }
            // 点击空白：确认
            emit requestFinalizePendingEntity(m_pendingPolyWorld);
            e->accept();
            return;
        }

        m_dragging = true;
        m_drawingEntity = true;
        m_draggingEntity = false;
        m_selectedEntity = -1;
        emit selectedEntityChanged(false, QString(), 0, QPointF());
        m_lastMouseView = e->position();
        m_strokeWorld.clear();
        m_strokeWorld.push_back(viewToWorld(e->position()));
        update();
        return;
    }

    m_dragging = true;
    m_lastMouseView = e->position();
    const QPointF worldPos = viewToWorld(e->position());

    if (e->button() == Qt::MiddleButton || m_tool == Tool::Move) {
        setCursor(Qt::ClosedHandCursor);
    }

    if (m_tool == Tool::Move && e->button() == Qt::LeftButton) {
        // 摄像机：绘制在工具之上，命中优先于工具
        if (!m_presentationPreviewMode) {
            const qreal handleRWorld = 12.0 / std::max(m_scale, 0.001);
            for (int idx = static_cast<int>(m_cameraOverlays.size()) - 1; idx >= 0; --idx) {
                const auto& cam = m_cameraOverlays[idx];
                if (!cam.visible || cam.id.isEmpty() || m_tempHiddenCameraIds.contains(cam.id)) {
                    continue;
                }
                const QRectF camRect = cameraWorldViewportRect(cam);
                const double dist = QLineF(worldPos, cam.centerWorld).length();
                const bool inHandle = dist <= handleRWorld;
                const bool inRect = camRect.contains(worldPos);
                if (!inHandle && !inRect) {
                    continue;
                }
                m_selectedCameraIndex = idx;
                m_selectedCameraId = cam.id;
                m_selectedEntity = -1;
                m_selectedTool = -1;
                m_draggingTool = false;
                m_draggingEntity = false;
                emit selectedEntityChanged(false, QString(), 0, QPointF());
                emit selectedToolChanged(false, QString(), QPointF());
                if (inHandle) {
                    m_draggingCamera = true;
                    m_cameraDragOffsetWorld = worldPos - cam.centerWorld;
                    m_cameraDragStartCenterWorld = cam.centerWorld;
                } else {
                    m_draggingCamera = false;
                }
                emit selectedCameraChanged(true, cam.id, cam.centerWorld, cam.viewScale);
                update();
                return;
            }
        }

        // 命中测试：按绘制顺序从上到下（priority/深度），找到顶层的实体或工具
        struct HitItem {
            enum class Kind { Entity, Tool };
            Kind kind = Kind::Entity;
            int index = -1;
            int priority = 0;
            int depth = 0;
        };
        QVector<HitItem> order;
        order.reserve(m_entities.size() + m_tools.size());
        for (int i = 0; i < m_entities.size(); ++i) {
            const auto& ent = m_entities[i];
            if (ent.opacity <= 0.001) continue;
            if (!ent.id.isEmpty() && m_tempHiddenEntityIds.contains(ent.id)) continue;
            order.push_back(HitItem{HitItem::Kind::Entity, i, ent.priority, ent.depth});
        }
        for (int i = 0; i < m_tools.size(); ++i) {
            const auto& tv = m_tools[i];
            if (tv.opacity <= 0.001) continue;
            if (!tv.tool.id.isEmpty() && m_tempHiddenToolIds.contains(tv.tool.id)) continue;
            if (tv.tool.type != core::Project::Tool::Type::Bubble) continue;
            order.push_back(HitItem{HitItem::Kind::Tool, i, tv.tool.priority, tv.depthZ});
        }
        std::stable_sort(order.begin(), order.end(), [](const HitItem& a, const HitItem& b) {
            if (a.priority != b.priority) return a.priority < b.priority;
            if (a.depth != b.depth) return a.depth < b.depth;
            if (a.kind != b.kind) return int(a.kind) < int(b.kind);
            return a.index < b.index;
        });
        for (qsizetype i = order.size(); i > 0; --i) {
            const auto& it = order[i - 1];
            if (it.kind == HitItem::Kind::Tool) {
                const auto& tv = m_tools[it.index];
                const QPainterPath path = bubblePathWorld(tv.tool);
                if (!path.contains(worldPos)) continue;
                clearCameraSelection();
                m_selectedTool = it.index;
                m_selectedEntity = -1;
                m_draggingTool = true;
                m_dragMode = DragMode::Free;
                m_toolDragOffsetOriginWorld = worldPos - m_tools[m_selectedTool].tool.originWorld;
                m_toolDragStartOriginWorld = m_tools[m_selectedTool].tool.originWorld;
                emit selectedEntityChanged(false, QString(), 0, QPointF());
                emit selectedToolChanged(true, m_tools[m_selectedTool].tool.id, m_tools[m_selectedTool].tool.originWorld);
                update();
                return;
            }
            const auto& ent = m_entities[it.index];
            bool hit = false;
            if (!ent.pathWorld.isEmpty()) hit = ent.pathWorld.contains(worldPos);
            else if (!ent.polygonWorld.isEmpty()) hit = entity_cutout::pathFromWorldPolygon(ent.polygonWorld).contains(worldPos);
            else hit = ent.rect.contains(worldPos);
            if (!hit) continue;
            // 选择实体（保持原逻辑）
            clearCameraSelection();
            m_selectedEntity = it.index;
            m_selectedTool = -1;
            m_draggingTool = false;
            m_draggingEntity = true;
            m_dragMode = DragMode::Free;
            emit entityDragActiveChanged(true);
            const QRectF r = m_entities[m_selectedEntity].rect.isNull() && !m_entities[m_selectedEntity].polygonWorld.isEmpty()
                                 ? entity_cutout::pathFromWorldPolygon(m_entities[m_selectedEntity].polygonWorld).boundingRect()
                                 : m_entities[m_selectedEntity].rect;
            m_entities[m_selectedEntity].rect = r;
            {
                const auto& he = m_entities[m_selectedEntity];
                const QPointF cRef = shapeCentroidWorld(he.polygonWorld, he.rect);
                const double s = std::max(1e-6, he.visualScale);
                m_entityDragAnchorLocal = (worldPos - cRef) / s;
                m_entityDragStartCentroidWorld = cRef;
            }
            // drag preview baseline
            m_dragPreviewActive = true;
            m_dragDelta = QPointF(0, 0);
            m_dragOriginBase = m_entities[m_selectedEntity].animatedOriginWorld;
            m_dragRectBase = m_entities[m_selectedEntity].rect;
            m_dragImageTopLeftBase = m_entities[m_selectedEntity].imageTopLeft;
            m_dragScaleBase = std::max(1e-6, m_entities[m_selectedEntity].visualScale);
            m_dragScaleRatio = 1.0;
            m_dragPolyBase = m_entities[m_selectedEntity].polygonWorld;
            m_dragPathBase = m_entities[m_selectedEntity].pathWorld;
            m_dragCentroidBase =
                m_dragPolyBase.isEmpty() ? m_dragRectBase.center() : entity_cutout::polygonCentroid(m_dragPolyBase);
            const QPointF origin = !m_entities[m_selectedEntity].polygonWorld.isEmpty()
                                       ? entity_cutout::polygonCentroid(m_entities[m_selectedEntity].polygonWorld)
                                       : m_entities[m_selectedEntity].rect.center();
            emit selectedEntityChanged(true, m_entities[m_selectedEntity].id, m_entities[m_selectedEntity].depth, origin);
            emit selectedToolChanged(false, QString(), QPointF());
            update();
            return;
        }

        // 优先：若已选中实体，且点在 gizmo 手柄上，则开启轴约束拖动
        if (m_selectedEntity >= 0 && m_selectedEntity < m_entities.size()) {
            const auto& ent = m_entities[m_selectedEntity];
            const bool isDragPreview = (m_draggingEntity && m_dragPreviewActive);
            QPointF originWorld = shapeCentroidWorld(ent.polygonWorld, ent.rect);
            if (isDragPreview) {
                originWorld = m_dragCentroidBase + m_dragDelta;
            }
            const QPointF originView = worldToView(originWorld);
            const GizmoHit gh = hitTestGizmo(e->position(), originView);
            if (gh.mode == DragMode::AxisX || gh.mode == DragMode::AxisY) {
                clearCameraSelection();
                m_dragging = true;
                m_draggingEntity = true;
                m_dragMode = gh.mode;
                m_lastMouseView = e->position();
                m_dragStartMouseWorld = viewToWorld(e->position());

                // 为了统一复用 move 逻辑：初始化 rect 与基准点
                const QRectF r = m_entities[m_selectedEntity].rect.isNull() && !m_entities[m_selectedEntity].polygonWorld.isEmpty()
                                     ? entity_cutout::pathFromWorldPolygon(m_entities[m_selectedEntity].polygonWorld).boundingRect()
                                     : m_entities[m_selectedEntity].rect;
                m_entities[m_selectedEntity].rect = r;
                {
                    const auto& se = m_entities[m_selectedEntity];
                    const QPointF cRef = shapeCentroidWorld(se.polygonWorld, se.rect);
                    const double s = std::max(1e-6, se.visualScale);
                    m_entityDragAnchorLocal = (viewToWorld(e->position()) - cRef) / s;
                    m_entityDragStartCentroidWorld = cRef;
                }
                // drag preview baseline
                m_dragPreviewActive = true;
                m_dragDelta = QPointF(0, 0);
                m_dragOriginBase = m_entities[m_selectedEntity].animatedOriginWorld;
                m_dragRectBase = m_entities[m_selectedEntity].rect;
                m_dragImageTopLeftBase = m_entities[m_selectedEntity].imageTopLeft;
                m_dragScaleBase = std::max(1e-6, m_entities[m_selectedEntity].visualScale);
                m_dragScaleRatio = 1.0;
                m_dragPolyBase = m_entities[m_selectedEntity].polygonWorld;
                m_dragPathBase = m_entities[m_selectedEntity].pathWorld;
                m_dragCentroidBase =
                    m_dragPolyBase.isEmpty() ? m_dragRectBase.center() : entity_cutout::polygonCentroid(m_dragPolyBase);
                update();
                return;
            }
        }

        // 若已选中实体：点击命中该实体本体时，优先拖动“已选中实体”。
        // 这对父子层级很重要：子实体可能被父实体遮挡，但用户在项目树中选中子实体后仍应可拖动它。
        if (m_selectedEntity >= 0 && m_selectedEntity < m_entities.size()) {
            const auto& ent = m_entities[m_selectedEntity];
            bool hitSelected = false;
            if (!ent.pathWorld.isEmpty()) {
                hitSelected = ent.pathWorld.contains(worldPos);
            } else if (!ent.polygonWorld.isEmpty()) {
                hitSelected = entity_cutout::pathFromWorldPolygon(ent.polygonWorld).contains(worldPos);
            } else {
                hitSelected = ent.rect.contains(worldPos);
            }
            if (hitSelected) {
                clearCameraSelection();
                m_draggingEntity = true;
                m_dragMode = DragMode::Free;
                emit entityDragActiveChanged(true);
                const QRectF r = ent.rect.isNull() && !ent.polygonWorld.isEmpty()
                                     ? entity_cutout::pathFromWorldPolygon(ent.polygonWorld).boundingRect()
                                     : ent.rect;
                m_entities[m_selectedEntity].rect = r;
                {
                    const auto& se = m_entities[m_selectedEntity];
                    const QPointF cRef = shapeCentroidWorld(se.polygonWorld, se.rect);
                    const double s = std::max(1e-6, se.visualScale);
                    m_entityDragAnchorLocal = (worldPos - cRef) / s;
                    m_entityDragStartCentroidWorld = cRef;
                }
                // drag preview baseline
                m_dragPreviewActive = true;
                m_dragDelta = QPointF(0, 0);
                m_dragOriginBase = m_entities[m_selectedEntity].animatedOriginWorld;
                m_dragRectBase = m_entities[m_selectedEntity].rect;
                m_dragImageTopLeftBase = m_entities[m_selectedEntity].imageTopLeft;
                m_dragScaleBase = std::max(1e-6, m_entities[m_selectedEntity].visualScale);
                m_dragScaleRatio = 1.0;
                m_dragPolyBase = m_entities[m_selectedEntity].polygonWorld;
                m_dragPathBase = m_entities[m_selectedEntity].pathWorld;
                m_dragCentroidBase =
                    m_dragPolyBase.isEmpty() ? m_dragRectBase.center() : entity_cutout::polygonCentroid(m_dragPolyBase);
                update();
                return;
            }
        }

        const int hit = hitTestEntity(worldPos);
        if (hit >= 0) {
            clearCameraSelection();
            m_selectedEntity = hit;
            m_selectedTool = -1;
            m_draggingTool = false;
            m_draggingEntity = true;
            m_dragMode = DragMode::Free;
            emit entityDragActiveChanged(true);
            const QRectF r = m_entities[hit].rect.isNull() && !m_entities[hit].polygonWorld.isEmpty()
                                 ? entity_cutout::pathFromWorldPolygon(m_entities[hit].polygonWorld).boundingRect()
                                 : m_entities[hit].rect;
            m_entities[hit].rect = r;
            {
                const auto& he = m_entities[hit];
                const QPointF cRef = shapeCentroidWorld(he.polygonWorld, he.rect);
                const double s = std::max(1e-6, he.visualScale);
                m_entityDragAnchorLocal = (worldPos - cRef) / s;
                m_entityDragStartCentroidWorld = cRef;
            }
            // drag preview baseline
            m_dragPreviewActive = true;
            m_dragDelta = QPointF(0, 0);
            m_dragOriginBase = m_entities[hit].animatedOriginWorld;
            m_dragRectBase = m_entities[hit].rect;
            m_dragImageTopLeftBase = m_entities[hit].imageTopLeft;
            m_dragScaleBase = std::max(1e-6, m_entities[hit].visualScale);
            m_dragScaleRatio = 1.0;
            m_dragPolyBase = m_entities[hit].polygonWorld;
            m_dragPathBase = m_entities[hit].pathWorld;
            m_dragCentroidBase =
                m_dragPolyBase.isEmpty() ? m_dragRectBase.center() : entity_cutout::polygonCentroid(m_dragPolyBase);
            const QPointF origin = !m_entities[hit].polygonWorld.isEmpty() ? entity_cutout::polygonCentroid(m_entities[hit].polygonWorld)
                                                                          : m_entities[hit].rect.center();
            emit selectedEntityChanged(true, m_entities[hit].id, m_entities[hit].depth, origin);
            emit selectedToolChanged(false, QString(), QPointF());
            update();
            return;
        }
        m_selectedEntity = -1;
        m_draggingEntity = false;
        m_selectedTool = -1;
        m_draggingTool = false;
        m_dragMode = DragMode::None;
        clearCameraSelection();
        emit selectedEntityChanged(false, QString(), 0, QPointF());
        emit selectedToolChanged(false, QString(), QPointF());
        update();
    }
}

void EditorCanvas::mouseMoveEvent(QMouseEvent* e) {
    const QPointF wp = viewToWorld(e->position());
    emit hoveredWorldPosChanged(wp);
    int z = -1;
    if (!m_depthAbsPath.isEmpty()) {
        if (m_depthDirty) {
            m_depthDirty = false;
            m_depthImage8 = core::image_file::loadDepthMapAlignedToBackground(m_depthAbsPath, m_bgAbsPath);
        }
        if (!m_depthImage8.isNull()) {
            const int xi = static_cast<int>(std::floor(wp.x()));
            const int yi = static_cast<int>(std::floor(wp.y()));
            if (xi >= 0 && yi >= 0 && xi < m_depthImage8.width() && yi < m_depthImage8.height()) {
                z = static_cast<int>(m_depthImage8.constScanLine(yi)[xi]);
            }
        }
    }
    emit hoveredWorldPosDepthChanged(wp, z);

    if (m_blackholeCopyResolveActive) {
        if (m_blackholeCopyDragging && (e->buttons() & Qt::LeftButton)) {
            QRectF src = m_blackholeCopySourceRect;
            src.moveTopLeft(wp - m_blackholeCopyDragOffset);
            src = clampRectTopLeftToBounds(src, worldRectOfBackground());
            m_blackholeCopySourceRect = src;
            update();
        }
        e->accept();
        return;
    }

    if (m_presentationPreviewMode) {
        if (!m_presentationHotspotPlaybackTargetEnabled) {
            if (m_presHoverEntityIndex >= 0 || (m_presHoverTimer && m_presHoverTimer->isActive()) ||
                m_presHoverPhase != 0.0) {
                if (m_presHoverTimer) {
                    m_presHoverTimer->stop();
                }
                m_presHoverEntityIndex = -1;
                m_presHoverPhase = 0.0;
                updateCursor();
                update();
            }
        } else {
        const int h = hitTestEntity(wp);
        if (h != m_presHoverEntityIndex) {
            m_presHoverEntityIndex = h;
            updateCursor();
            update();
        }
        if (h >= 0) {
            if (m_presHoverTimer && !m_presHoverTimer->isActive()) {
                m_presHoverTimer->start();
            }
        } else if (m_presHoverTimer) {
            m_presHoverTimer->stop();
            m_presHoverPhase = 0.0;
        }
        }
    }

    if (!m_dragging) {
        QWidget::mouseMoveEvent(e);
        return;
    }

    const QPointF cur = e->position();
    const QPointF deltaView = cur - m_lastMouseView;
    m_lastMouseView = cur;

    if (m_draggingHotspotIndex >= 0 && m_draggingHotspotIndex < m_presentationHotspots.size()) {
        const QPointF worldPos = viewToWorld(cur);
        m_presentationHotspots[m_draggingHotspotIndex].centerWorld = worldPos - m_hotspotDragOffsetWorld;
        update();
        return;
    }

    if (m_pendingDragging && !m_presentationPreviewMode && m_pendingPolyWorld.size() >= 3) {
        const QPointF curWorld = viewToWorld(e->position());
        const QPointF delta = curWorld - m_pendingLastMouseWorld;
        m_pendingLastMouseWorld = curWorld;
        if (m_pendingDragWhole) {
            for (auto& pt : m_pendingPolyWorld) {
                pt += delta;
            }
        } else if (m_pendingDragVertex >= 0 && m_pendingDragVertex < m_pendingPolyWorld.size()) {
            m_pendingPolyWorld[m_pendingDragVertex] += delta;
        }
        update();
        return;
    }

    if (m_tool == Tool::CreateEntity && m_drawingEntity) {
        const QPointF w = viewToWorld(cur);
        if (m_strokeWorld.isEmpty()) {
            m_strokeWorld.push_back(w);
            update();
            return;
        }
        const QPointF last = m_strokeWorld.last();
        const qreal dx = w.x() - last.x();
        const qreal dy = w.y() - last.y();
        // 简单抽样：world 距离至少 1.5 像素才记录，避免点过密
        if ((dx * dx + dy * dy) >= (1.5 * 1.5)) {
            m_strokeWorld.push_back(w);
            update();
        }
        return;
    }

    if (m_draggingCamera && m_selectedCameraIndex >= 0 && m_selectedCameraIndex < m_cameraOverlays.size()) {
        const QPointF worldPos = viewToWorld(cur);
        const QPointF newCenter = worldPos - m_cameraDragOffsetWorld;
        QPointF delta = newCenter - m_cameraOverlays[m_selectedCameraIndex].centerWorld;
        m_cameraOverlays[m_selectedCameraIndex].centerWorld += delta;
        const auto& c = m_cameraOverlays[m_selectedCameraIndex];
        emit selectedCameraChanged(true, c.id, c.centerWorld, c.viewScale);
        update();
        return;
    }

    if (m_draggingEntity && m_selectedEntity >= 0 && m_selectedEntity < m_entities.size()) {
        const QPointF worldPos = viewToWorld(cur);
        auto& ent = m_entities[m_selectedEntity];
        const double curScale = std::max(1e-6, ent.visualScale);
        const QPointF centroidNow =
            m_dragPreviewActive ? (m_dragCentroidBase + m_dragDelta) : shapeCentroidWorld(ent.polygonWorld, ent.rect);
        const QPointF newCentroid = worldPos - m_entityDragAnchorLocal * curScale;
        QPointF delta = newCentroid - centroidNow;

        // 轴约束：只允许沿 X 或 Y 平移（world 坐标）
        if (m_dragMode == DragMode::AxisX) {
            delta.setY(0.0);
        } else if (m_dragMode == DragMode::AxisY) {
            delta.setX(0.0);
        }

        // 约束到背景范围内（若有背景），按“预览变换后”的包围盒约束
        const QRectF bg = worldRectOfBackground();
        if (!bg.isNull()) {
            const QRectF moved = transformedRectByScaleAndTranslate(
                m_dragPreviewActive ? m_dragRectBase : ent.rect,
                m_dragPreviewActive ? m_dragCentroidBase : ent.rect.center(),
                m_dragPreviewActive ? m_dragScaleRatio : 1.0,
                (m_dragPreviewActive ? m_dragDelta : QPointF(0, 0)) + delta);
            QPointF d = delta;
            if (moved.left() < bg.left()) d.setX(d.x() + (bg.left() - moved.left()));
            if (moved.top() < bg.top()) d.setY(d.y() + (bg.top() - moved.top()));
            if (moved.right() > bg.right()) d.setX(d.x() - (moved.right() - bg.right()));
            if (moved.bottom() > bg.bottom()) d.setY(d.y() - (moved.bottom() - bg.bottom()));
            delta = d;
        }

        // 轻量：仅更新增量参数与原点，不逐点修改 polygonWorld
        if (m_dragPreviewActive) {
            m_dragDelta += delta;
        }
        ent.animatedOriginWorld += delta;

            // 拖动中实时按深度图更新 z 与距离缩放（近大远小）
            // 但不必每个鼠标事件都重算：位置平移满帧跟手；深度/距离缩放重算较重，节流到 ~30Hz。
            const qint64 nowMs = m_previewEmitTimer.elapsed();
            if (nowMs - m_lastDepthScaleRecalcMs >= 33) {
                m_lastDepthScaleRecalcMs = nowMs;

                if (!m_depthAbsPath.isEmpty() && m_depthDirty) {
                    m_depthDirty = false;
                    m_depthImage8 = core::image_file::loadDepthMapAlignedToBackground(m_depthAbsPath, m_bgAbsPath);
                }
                if (!m_depthImage8.isNull()) {
                    const QPointF c =
                        m_dragPreviewActive ? (m_dragCentroidBase + m_dragDelta) : shapeCentroidWorld(ent.polygonWorld, ent.rect);
                    const int depthZ = sampleDepthAtPoint(m_depthImage8, c);
                    ent.depth = depthZ;

                    const double ds01 = depthToScale01(depthZ);
                    ent.animatedDepthScale01 = ds01;
                    const double newScale =
                        (ent.ignoreDistanceScale ? 1.0 : distanceScaleFromDepth01(ds01, ent.distanceScaleCalibMult)) * ent.userScale;
                    ent.visualScale = newScale;
                    if (m_dragPreviewActive) {
                        m_dragScaleRatio =
                            std::clamp(newScale / std::max(1e-6, m_dragScaleBase), 0.02, static_cast<double>(kViewScaleMax));
                    }
                }
            }
            // 低频预览信号：用于属性面板同步，不做树联动等重操作
            // 属性面板/状态预览：按 30Hz 刷新即可，拖动视觉仍满帧跟手
            if (nowMs - m_lastPreviewEmitMs >= 33) {
                m_lastPreviewEmitMs = nowMs;
                const QPointF previewCenter =
                    m_dragPreviewActive ? (m_dragCentroidBase + m_dragDelta)
                                        : shapeCentroidWorld(ent.polygonWorld, ent.rect);
                emit selectedEntityPreviewChanged(ent.id, ent.depth, previewCenter);
            }
        update();
        return;
    }

    if (m_draggingTool && m_selectedTool >= 0 && m_selectedTool < m_tools.size()) {
        const QPointF worldPos = viewToWorld(cur);
        const QPointF newOrigin = worldPos - m_toolDragOffsetOriginWorld;
        QPointF delta = newOrigin - m_tools[m_selectedTool].tool.originWorld;
        m_tools[m_selectedTool].tool.originWorld += delta;
        emit selectedToolChanged(true, m_tools[m_selectedTool].tool.id, m_tools[m_selectedTool].tool.originWorld);
        update();
        return;
    }

    // 平移画布
    if (m_tool == Tool::Move || (e->buttons() & Qt::MiddleButton) ||
        (m_presentationPreviewMode && (e->buttons() & Qt::LeftButton))) {
        if (!(m_presentationPreviewMode && m_previewCameraViewLocked)) {
            if (m_presentationPreviewMode && m_presBgPanSession) {
                m_presBgDragDist += std::abs(deltaView.x()) + std::abs(deltaView.y());
            }
            m_pan += deltaView;
        }
        update();
        return;
    }
}

void EditorCanvas::mouseReleaseEvent(QMouseEvent* e) {
    if (m_blackholeCopyResolveActive && e->button() == Qt::LeftButton) {
        if (m_blackholeCopyDragging) {
            m_blackholeCopyDragging = false;
            const QPointF delta = m_blackholeCopySourceRect.topLeft() - m_blackholeCopyHoleRect.topLeft();
            emit requestResolveBlackholeCopy(
                m_blackholeCopyEntityId,
                QPoint(static_cast<int>(std::round(delta.x())), static_cast<int>(std::round(delta.y()))));
        }
        cancelBlackholeCopyResolve();
        e->accept();
        return;
    }
    if (e->button() == Qt::LeftButton || e->button() == Qt::MiddleButton) {
        if (m_presentationPreviewMode && e->button() == Qt::LeftButton) {
            if (m_presBgPanSession && m_presBgDragDist < 8.0) {
                clearPresentationEntityFocus();
            }
            m_presBgPanSession = false;
            m_presBgDragDist = 0.0;
        }
        if (m_tool == Tool::CreateEntity && e->button() == Qt::LeftButton && m_drawingEntity) {
            m_dragging = false;
            m_drawingEntity = false;
            updateCursor();

            if (m_entityCreateSegmentMode == EntityCreateSegmentMode::Manual) {
                if (m_strokeWorld.size() >= kMinStrokePointsManual) {
                    setPendingEntityPolygonWorld(m_strokeWorld);
                }
            } else if (m_entityCreateSegmentMode == EntityCreateSegmentMode::Snap) {
                if (m_strokeWorld.size() >= kMinStrokePointsManual) {
                    const QRectF polyBr = QPolygonF(m_strokeWorld).boundingRect();
                    QRect cropWorld;
                    QImage crop;
                    if (loadRgbCropForEntitySegmentStroke(polyBr, cropWorld, crop)) {
                        const QImage gray = crop.convertToFormat(QImage::Format_Grayscale8);
                        const QVector<QPointF> snapped =
                            snapStrokeToEdgesWorld(m_strokeWorld, gray, cropWorld.topLeft(), cropWorld.size(), 6.0);
                        setPendingEntityPolygonWorld(snapped);
                    }
                }
            } else if (m_strokeWorld.size() >= kMinStrokePointsSam) {
                const QRectF polyBr = QPolygonF(m_strokeWorld).boundingRect();
                QRect cropWorld;
                QImage crop;
                QByteArray cropPng;
                QByteArray ovPng;
                QPointF cropOrigin;
                QJsonArray pts;
                QJsonArray labs;
                QJsonArray box;
                if (loadRgbCropForEntitySegmentStroke(polyBr, cropWorld, crop) &&
                    buildSamSegmentPayloadFromStrokeMapped(m_strokeWorld, crop, cropWorld, cropPng, ovPng, cropOrigin,
                                                           pts, labs, box)) {
                    emit requestSamSegment(cropPng, ovPng, cropOrigin, pts, labs, box);
                }
            }
            m_strokeWorld.clear();
            update();
            return;
        }

        if (m_draggingEntity && m_selectedEntity >= 0 && m_selectedEntity < m_entities.size() && e->button() == Qt::LeftButton) {
            const auto& ent = m_entities[m_selectedEntity];

            // 关键：提交“平移量”必须与缩放无关。
            // 拖动过程中可能实时按深度重算 visualScale（导致 rect/topLeft 随缩放变化），
            // 因此不能用 rect.topLeft 差值作为移动 delta，否则松手会错位。
            const QPointF endCentroid = m_dragPreviewActive ? (m_dragCentroidBase + m_dragDelta)
                                                            : shapeCentroidWorld(ent.polygonWorld, ent.rect);
            const QPointF delta = endCentroid - m_entityDragStartCentroidWorld;

            bool sentMove = false;
            if (!ent.id.isEmpty() && (!qFuzzyIsNull(delta.x()) || !qFuzzyIsNull(delta.y()))) {
                emit requestMoveEntity(ent.id, delta);
                sentMove = true;
            }
            if (!sentMove && !ent.id.isEmpty()) {
                const QPointF origin =
                    ent.polygonWorld.isEmpty() ? ent.rect.center() : entity_cutout::polygonCentroid(ent.polygonWorld);
                emit selectedEntityChanged(true, ent.id, ent.depth, origin);
            }
        }

        if (m_draggingTool && m_selectedTool >= 0 && m_selectedTool < m_tools.size() && e->button() == Qt::LeftButton) {
            const auto& tv = m_tools[m_selectedTool];
            const QPointF delta = tv.tool.originWorld - m_toolDragStartOriginWorld;
            if (!tv.tool.id.isEmpty() && (!qFuzzyIsNull(delta.x()) || !qFuzzyIsNull(delta.y()))) {
                emit requestMoveTool(tv.tool.id, delta);
            } else if (!tv.tool.id.isEmpty()) {
                emit selectedToolChanged(true, tv.tool.id, tv.tool.originWorld);
            }
        }

        if (m_draggingCamera && m_selectedCameraIndex >= 0 && m_selectedCameraIndex < m_cameraOverlays.size() &&
            e->button() == Qt::LeftButton) {
            const auto& cam = m_cameraOverlays[m_selectedCameraIndex];
            const QPointF delta = cam.centerWorld - m_cameraDragStartCenterWorld;
            if (!cam.id.isEmpty() && (!qFuzzyIsNull(delta.x()) || !qFuzzyIsNull(delta.y()))) {
                emit requestMoveCamera(cam.id, delta);
            } else if (!cam.id.isEmpty()) {
                emit selectedCameraChanged(true, cam.id, cam.centerWorld, cam.viewScale);
            }
        }

        if (m_draggingHotspotIndex >= 0 && e->button() == Qt::LeftButton &&
            m_draggingHotspotIndex < m_presentationHotspots.size()) {
            const auto& h = m_presentationHotspots[m_draggingHotspotIndex];
            emit presentationHotspotMoved(h.id, h.centerWorld);
            m_draggingHotspotIndex = -1;
        }

        m_dragging = false;
        if (m_pendingDragging && e->button() == Qt::LeftButton) {
            m_pendingDragging = false;
            m_pendingDragWhole = false;
            m_pendingDragVertex = -1;
        }
        if (m_draggingEntity) {
            emit entityDragActiveChanged(false);
        }
        m_draggingEntity = false;
        m_draggingTool = false;
        m_draggingCamera = false;
        m_dragPreviewActive = false;
        m_dragMode = DragMode::None;
        updateCursor();
    }
    QWidget::mouseReleaseEvent(e);
}

void EditorCanvas::wheelEvent(QWheelEvent* e) {
    if (m_presentationPreviewMode && m_previewCameraViewLocked) {
        e->accept();
        return;
    }
    if (!m_presentationPreviewMode && !m_selectedCameraId.isEmpty() && m_tool == Tool::Move) {
        const qreal steps = e->angleDelta().y() / 120.0;
        const qreal factor = std::pow(1.15, steps);
        if (!qFuzzyCompare(factor, 1.0)) {
            emit requestCameraViewScaleAdjust(m_selectedCameraId, factor);
        }
        e->accept();
        return;
    }
    if (m_tool != Tool::Zoom && !(e->modifiers() & Qt::ControlModifier)) {
        // 默认仍允许滚轮缩放：不强制用户切换工具
        //（若你希望仅在 Zoom 工具下才缩放，可在此 return）
    }

    const QPointF cursorView = e->position();
    const QPointF beforeWorld = viewToWorld(cursorView);

    // 约定：滚轮一步约 15°，这里做平滑指数缩放
    const qreal steps = e->angleDelta().y() / 120.0;
    const qreal factor = std::pow(1.15, steps);

    const qreal newScale = std::clamp(m_scale * factor, kViewScaleMin, kViewScaleMax);
    if (qFuzzyCompare(newScale, m_scale)) {
        return;
    }
    m_scale = newScale;

    // 让“光标指向的 world 点”缩放后仍落在光标处
    const QPointF afterView = worldToView(beforeWorld);
    m_pan += (cursorView - afterView);
    invalidateViewportLod();
    update();
    e->accept();
}

void EditorCanvas::keyPressEvent(QKeyEvent* e) {
    if (m_blackholeCopyResolveActive && e->key() == Qt::Key_Escape) {
        cancelBlackholeCopyResolve();
        e->accept();
        return;
    }
    if (m_presentationPreviewMode && e->key() == Qt::Key_Escape) {
        clearPresentationEntityFocus();
        e->accept();
        return;
    }
    if (!m_presentationPreviewMode && m_pendingPolyWorld.size() >= 3) {
        if (e->key() == Qt::Key_Return || e->key() == Qt::Key_Enter) {
            emit requestFinalizePendingEntity(m_pendingPolyWorld);
            e->accept();
            return;
        }
        if (e->key() == Qt::Key_Escape) {
            clearPendingEntityPolygon();
            e->accept();
            return;
        }
    }
    QWidget::keyPressEvent(e);
}