Add mouse wheel zoom interaction in perspective widget

fishui/MainViewModel.py

@@ -172,7 +172,7 @@ class MainViewModel(QObject):
         self.updateBlockProjection()
 
     def setPerspectiveScale(self, scale):
-        self.perspective_scale = scale
+        self.perspective_scale = max(min(10, scale), 1)
         self.propertiesDidChange.emit()
         self.updateBlockProjection()
 

fishui/widgets/PerspectiveBlockWidget.py

 import sys
 from PySide2.QtGui import QPainter, QColor, QPen, QPalette, QPolygonF
-from PySide2.QtWidgets import QWidget
+from PySide2.QtWidgets import QWidget, QApplication
 from PySide2.QtCore import QSize, Qt, QPointF, QRect, Slot
 from fishui.MainViewModel import MainViewModel
 
@@ -127,3 +127,8 @@ class PerspectiveBlockWidget(QWidget):
             self.initialMV0 = None
             self.initialMV1 = None
             self.initialMouse = None
+
+    def wheelEvent(self, event):
+        if QApplication.keyboardModifiers() == Qt.ControlModifier:
+            new_scale = self.viewModel.perspective_scale + (1 if event.angleDelta().y() < 0 else -1)
+            self.viewModel.setPerspectiveScale(new_scale)