Support zoom in/out using mouse wheel.

Author: awulkiew

Visual_Studio_2015/GraphicalDebugging/GeometryWatchControl.xaml

@@ -15,7 +15,12 @@
             <RowDefinition Height="Auto" />
             <RowDefinition Height="0.5*" />
         </Grid.RowDefinitions>
-        <Grid x:Name="imageGrid" Background="Transparent" Cursor="Cross" MouseDown="imageGrid_MouseDown" MouseMove="imageGrid_MouseMove" MouseUp="imageGrid_MouseUp" MouseLeave="imageGrid_MouseLeave" >
+        <Grid x:Name="imageGrid" Background="Transparent" Cursor="Cross"
+              MouseDown="imageGrid_MouseDown"
+              MouseMove="imageGrid_MouseMove"
+              MouseUp="imageGrid_MouseUp"
+              MouseLeave="imageGrid_MouseLeave"
+              MouseWheel="imageGrid_MouseWheel" >
             <Image x:Name="image" Stretch="Fill" Height="Auto" Width="Auto" />
             <Canvas x:Name="imageCanvas" Height="Auto" Width="Auto" />
         </Grid>

Visual_Studio_2015/GraphicalDebugging/GeometryWatchControl.xaml.cs

@@ -511,5 +511,27 @@ private void imageGrid_MouseLeave(object sender, System.Windows.Input.MouseEvent
             m_mouseHLine.Visibility = Visibility.Hidden;
             m_mouseTxt.Visibility = Visibility.Hidden;
         }
+
+        private void imageGrid_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
+        {
+            System.Windows.Point point = e.GetPosition(imageGrid);
+            bool zoomOut = e.Delta < 0;
+
+            double scale = 0.75;
+            if (zoomOut)
+                scale = 1.0 / scale;
+
+            double leftFrac = point.X / image.ActualWidth;
+            double topFrac = point.Y / image.ActualHeight;
+            double w = image.ActualWidth * scale;
+            double h = image.ActualHeight * scale;
+            double l = point.X - leftFrac * w;
+            double t = point.Y - topFrac * h;
+
+            // NOTE: Currently it's possible to zoom out further than the default zoom
+            m_zoomBox.Zoom(l, t, w, h, image.ActualWidth, image.ActualHeight);
+
+            UpdateItems(false);
+        }
     }
 }

Visual_Studio_2015/GraphicalDebugging/PlotWatchControl.xaml

@@ -15,7 +15,12 @@
             <RowDefinition Height="Auto" />
             <RowDefinition Height="0.5*" />
         </Grid.RowDefinitions>
-        <Grid x:Name="imageGrid" Background="Transparent" Cursor="Cross" MouseDown="imageGrid_MouseDown" MouseMove="imageGrid_MouseMove" MouseUp="imageGrid_MouseUp" MouseLeave="imageGrid_MouseLeave" >
+        <Grid x:Name="imageGrid" Background="Transparent" Cursor="Cross"
+              MouseDown="imageGrid_MouseDown"
+              MouseMove="imageGrid_MouseMove"
+              MouseUp="imageGrid_MouseUp"
+              MouseLeave="imageGrid_MouseLeave"
+              MouseWheel="imageGrid_MouseWheel" >
             <Image x:Name="image" Stretch="Fill" Height="Auto" Width="Auto" />
             <Canvas x:Name="imageCanvas" Height="Auto" Width="Auto" />
         </Grid>

Visual_Studio_2015/GraphicalDebugging/PlotWatchControl.xaml.cs

@@ -527,5 +527,27 @@ private void imageGrid_MouseLeave(object sender, System.Windows.Input.MouseEvent
             m_mouseHLine.Visibility = Visibility.Hidden;
             m_mouseTxt.Visibility = Visibility.Hidden;
         }
+
+        private void imageGrid_MouseWheel(object sender, System.Windows.Input.MouseWheelEventArgs e)
+        {
+            System.Windows.Point point = e.GetPosition(imageGrid);
+            bool zoomOut = e.Delta < 0;
+
+            double scale = 0.75;
+            if (zoomOut)
+                scale = 1.0 / scale;
+
+            double leftFrac = point.X / image.ActualWidth;
+            double topFrac = point.Y / image.ActualHeight;
+            double w = image.ActualWidth * scale;
+            double h = image.ActualHeight * scale;
+            double l = point.X - leftFrac * w;
+            double t = point.Y - topFrac * h;
+
+            // NOTE: Currently it's possible to zoom out further than the default zoom
+            m_zoomBox.Zoom(l, t, w, h, image.ActualWidth, image.ActualHeight);
+
+            UpdateItems(false);
+        }
     }
 }