add symmetry position indicator, clear redo on new undo

Author: unitycoder

PixelArtTool/MainWindow.xaml

@@ -209,7 +209,7 @@
 		</Grid>
 		<CheckBox x:Name="chkOutline" Content="Outline" HorizontalAlignment="Left" Margin="638,50,0,0" VerticalAlignment="Top" Width="64" Click="chkOutline_Click"/>
 		<Rectangle x:Name="rectCurrentColor" Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="28" Margin="10,256,0,0" Stroke="Black" VerticalAlignment="Top" Width="28"/>
-		<CheckBox x:Name="chkMirrorX" Content="Symmetry X" HorizontalAlignment="Left" Margin="638,71,0,0" VerticalAlignment="Top" Width="93"/>
+		<CheckBox x:Name="chkMirrorX" Content="Symmetry X" HorizontalAlignment="Left" Margin="638,71,0,0" VerticalAlignment="Top" Width="93" Unchecked="chkMirrorX_Unchecked" Checked="chkMirrorX_Checked"/>
 		<Rectangle x:Name="rectSecondaryColor" Fill="Black" HorizontalAlignment="Left" Height="28" Margin="47,256,0,0" Stroke="Black" VerticalAlignment="Top" Width="28"/>
 
 		<!-- https://stackoverflow.com/a/32514853/5452781 -->
@@ -226,6 +226,8 @@
 				</Rectangle.Fill>
 			</Rectangle>
 			<Line x:Name="lineCurrentHueLine" X1="91" Y1="312" X2="91" Y2="334" Stroke="White" StrokeThickness="1" />
+			<Line x:Name="lineSymmetryXpositionA" X1="225" Y1="40" X2="225" Y2="50" Stroke="White" StrokeThickness="1" Visibility="Visible" />
+			<Line x:Name="lineSymmetryXpositionB" X1="225" Y1="312" X2="225" Y2="306" Stroke="White" StrokeThickness="1" Visibility="Visible" />
 		</Grid>
 		<Rectangle x:Name="rectGetTransparent" HorizontalAlignment="Left" Height="28" Margin="10,289,0,0" Stroke="Black" VerticalAlignment="Top" Width="28" MouseDown="OnGetTransparentColorButton">
 			<Rectangle.Fill>

PixelArtTool/MainWindow.xaml.cs

@@ -205,6 +205,10 @@ void Start()
             currentColor = palette[currentColorIndex];
             SetCurrentColorPreviewBox(rectCurrentColor, currentColor);
             ResetCurrentBrightnessPreview(currentColor);
+
+            lineSymmetryXpositionA.Visibility = Visibility.Hidden;
+            lineSymmetryXpositionB.Visibility = Visibility.Hidden;
+
         }
 
 
@@ -461,6 +465,8 @@ void PaletteLeftButtonDown(object sender, MouseButtonEventArgs e)
 
         void DrawingRightButtonDown(object sender, MouseButtonEventArgs e)
         {
+            RegisterUndo();
+
             int x = (int)(e.GetPosition(drawingImage).X / canvasScaleX);
             int y = (int)(e.GetPosition(drawingImage).Y / canvasScaleX);
 
@@ -489,8 +495,7 @@ void DrawingMiddleButtonDown(object sender, MouseButtonEventArgs e)
         void DrawingLeftButtonDown(object sender, MouseButtonEventArgs e)
         {
             // take current bitmap as currentimage
-            currentItem = canvasBitmap.Clone();
-            undoStack.Push(currentItem);
+            RegisterUndo();
 
             int x = (int)(e.GetPosition(drawingImage).X / canvasScaleX);
             int y = (int)(e.GetPosition(drawingImage).Y / canvasScaleX);
@@ -522,6 +527,13 @@ void DrawingLeftButtonDown(object sender, MouseButtonEventArgs e)
             }
         } // DrawingLeftButtonDown
 
+        // save undo state
+        void RegisterUndo()
+        {
+            currentItem = canvasBitmap.Clone();
+            undoStack.Push(currentItem);
+            redoStack.Clear();
+        }
 
         void DrawingMouseUp(object sender, MouseButtonEventArgs e)
         {
@@ -640,7 +652,7 @@ void DrawingMouseWheel(object sender, MouseWheelEventArgs e)
 
         private void OnClearButton(object sender, RoutedEventArgs e)
         {
-            //undoRedoWrapper.AddItem(canvasBitmap.Clone());
+            RegisterUndo();
             ClearImage(canvasBitmap, emptyRect, emptyPixels, emptyStride);
             UpdateOutline();
         }
@@ -1210,6 +1222,17 @@ private void OnGetTransparentColorButton(object sender, MouseButtonEventArgs e)
             ResetCurrentBrightnessPreview(currentColor);
         }
 
+        private void chkMirrorX_Unchecked(object sender, RoutedEventArgs e)
+        {
+            lineSymmetryXpositionA.Visibility = Visibility.Hidden;
+            lineSymmetryXpositionB.Visibility = Visibility.Hidden;
+        }
+
+        private void chkMirrorX_Checked(object sender, RoutedEventArgs e)
+        {
+            lineSymmetryXpositionA.Visibility = Visibility.Visible;
+            lineSymmetryXpositionB.Visibility = Visibility.Visible;
+        }
 
 
     } // class