Adapt fisheye fov 180 boundary dynamically to current projection

fishui/MainViewModel.py

@@ -29,6 +29,7 @@ class MainViewModel(QObject):
         self.samples_per_edge = 100
         self.projection = None
         self.perspective = None
+        self.fov_180_radius = None
         self.block_xf = None
         self.block_yf = None
         self.block_xp = None
@@ -90,6 +91,7 @@ class MainViewModel(QObject):
         focal_length_px = projections.Projection.to_focal_length_px(self.focal_length_mm, self.sensor_size_mm, self.sensor_size_px)
         self.projection = self.projection_cls(focal_length_px)
         self.perspective = projections.PerspectiveProjection(focal_length_px)
+        self.fov_180_radius = self.projection.radius(np.deg2rad(90))
         self.blockSignals(True)
         self.updateFisheyeBlockpoints()
         self.updatePerspectiveBlockpoints()

fishui/widgets/FisheyeBlockWidget.py

@@ -52,7 +52,14 @@ class FisheyeBlockWidget(QWidget):
         pen.setColor(QColor(0, 0, 0))
         pen.setWidth(painter.window().width()/200)
         painter.setPen(pen)
-        painter.drawEllipse(painter.window())
+        painter.drawEllipse(
+            QRect(
+                (self.viewModel.sensor_size_px[1]-1)/2 - self.viewModel.fov_180_radius,
+                (self.viewModel.sensor_size_px[0]-1)/2 - self.viewModel.fov_180_radius,
+                2 * self.viewModel.fov_180_radius,
+                2 * self.viewModel.fov_180_radius
+            )
+        )
 
     def drawPolygons(self, event, painter):
         color = QColor(255, 127, 14)