[detectionview] zooming

fixtracks/widgets/detectionview.py

@@ -87,14 +87,31 @@ class DetectionView(QWidget):
         self._img = None
         self._pixmapitem = None
         self._scene = DetectionScene()
+        # self.setRenderHint(QGraphicsView.RenderFlag.Ren Antialiasing)
         self._view = QGraphicsView()
         self._view.setSizePolicy(QSizePolicy.Policy.Expanding, QSizePolicy.Policy.Expanding)
         self._view.setMouseTracking(True)
+        self._zoomFactor = 1.15
+        self._minZoom = 0.1
+        self._maxZoom = 10
+        self._currentZoom = 1.0
 
         lyt = QVBoxLayout()
         lyt.addWidget(self._view)
         self.setLayout(lyt)
 
+    def wheelEvent(self, event):
+        if event.angleDelta().y() > 0:  # Zoom in
+            factor = self._zoomFactor
+        else:  # Zoom out
+            factor = 1 / self._zoomFactor
+
+        newZoom = self._currentZoom * factor
+
+        if self._minZoom < newZoom < self._maxZoom:
+            self._view.scale(factor, factor)
+            self._currentZoom = newZoom
+
     def setImage(self, image: QImage):
         self._img = image
         self._scene.signals.itemsSelected.connect(self.on_itemSelection)