update

2026-05-14 13:30:06 +08:00
parent 974946cee4
commit e43171521d
91 changed files with 10485 additions and 3254 deletions
@@ -68,7 +68,23 @@ QImage extractEntityImage(const QImage& bg, const QVector<QPointF>& polyWorld, Q
        outTopLeftWorld = {};
        return {};
    }
-    const QRect bbox = clampRectToImage(path.boundingRect().toAlignedRect(), bg.size());
+    // bbox 必须只由顶点 min/max 推导，不能依赖 QPainterPath::boundingRect()：
+    // 在坐标含小数时，boundingRect 的浮点误差会造成稳定的“右下”偏移。
+    double minX = polyWorld.front().x();
+    double minY = polyWorld.front().y();
+    double maxX = polyWorld.front().x();
+    double maxY = polyWorld.front().y();
+    for (const auto& p : polyWorld) {
+        minX = std::min(minX, double(p.x()));
+        minY = std::min(minY, double(p.y()));
+        maxX = std::max(maxX, double(p.x()));
+        maxY = std::max(maxY, double(p.y()));
+    }
+    const int left = std::clamp(int(std::floor(minX)), 0, bg.width());
+    const int top = std::clamp(int(std::floor(minY)), 0, bg.height());
+    const int right = std::clamp(int(std::ceil(maxX)), 0, bg.width() - 1);
+    const int bottom = std::clamp(int(std::ceil(maxY)), 0, bg.height() - 1);
+    const QRect bbox = clampRectToImage(QRect(QPoint(left, top), QPoint(right, bottom)), bg.size());
    if (bbox.isNull()) {
        outTopLeftWorld = {};
        return {};