add alpha support, add opacity slider, use opacity in currentcolor

Author: unitycoder

PixelArtTool/MainWindow.xaml

@@ -16,7 +16,7 @@
 					<Image Source="/Resources/Buttons/emptybutton.png" />
 				</Button>
 			</ToolBar>
-			
+
 			<ToolBar Band="1" BandIndex="1" VerticalAlignment="Top">
 				<RadioButton GroupName="Toolbar" Style="{StaticResource {x:Type ToggleButton}}">
 					<Image Source="/Resources/Buttons/drawmode.png" />
@@ -34,8 +34,13 @@
 					<Image Source="/Resources/Buttons/emptybutton.png" />
 				</RadioButton>
 			</ToolBar>
+
+			<ToolBar Band="1" BandIndex="1" VerticalAlignment="Top">
+				<Slider x:Name="sliderOpacity" ToolTip="Opacity" HorizontalAlignment="Left" Margin="0,0,0,0" VerticalAlignment="Top" Width="50" Height="28" Value="255" Maximum="255" LargeChange="0" SmallChange="1" ValueChanged="OpacitySliderValueChanged"/>
+			</ToolBar>
+
 		</ToolBarTray>
-		
+
 		<StatusBar Height="30" Margin="0,281,0,0" VerticalAlignment="Bottom">
 			<StatusBarItem Height="30" VerticalAlignment="Center">
 				<Label x:Name="lblMousePos" Content="Label"/>

PixelArtTool/MainWindow.xaml.cs

@@ -23,25 +23,26 @@ public partial class MainWindow : Window
         Image drawingImage;
         Image paletteImage;
 
+        // bitmap settings
         int canvasResolutionX = 16;
         int canvasResolutionY = 16;
-
         int paletteResolutionX = 4;
         int paletteResolutionY = 16;
-
-        int prevX;
-        int prevY;
-
         int canvasScaleX = 1;
         int paletteScaleX = 1;
         int paletteScaleY = 1;
-
         int dpiX = 96;
         int dpiY = 96;
 
+        // colors
         PixelColor currentColor;
         PixelColor[] palette;
         int currentColorIndex = 0;
+        byte opacity = 255;
+
+        // mouse
+        int prevX;
+        int prevY;
 
 
         public MainWindow()
@@ -58,7 +59,7 @@ void Start()
             RenderOptions.SetEdgeMode(drawingImage, EdgeMode.Aliased);
             w = (MainWindow)Application.Current.MainWindow;
             canvasScaleX = (int)drawingImage.Width / canvasResolutionX;
-            canvasBitmap = new WriteableBitmap(canvasResolutionX, canvasResolutionY, dpiX, dpiY, PixelFormats.Bgr32, null);
+            canvasBitmap = new WriteableBitmap(canvasResolutionX, canvasResolutionY, dpiX, dpiY, PixelFormats.Bgra32, null);
             drawingImage.Source = canvasBitmap;
 
             // drawing events
@@ -77,14 +78,13 @@ void Start()
             dpiY = 96;
             paletteScaleX = (int)paletteImage.Width / paletteResolutionX;
             paletteScaleY = (int)paletteImage.Height / paletteResolutionY;
-            paletteBitmap = new WriteableBitmap(paletteResolutionX, paletteResolutionY, dpiX, dpiY, PixelFormats.Bgr32, null);
+            paletteBitmap = new WriteableBitmap(paletteResolutionX, paletteResolutionY, dpiX, dpiY, PixelFormats.Bgra32, null);
             paletteImage.Source = paletteBitmap;
 
             // palette events
             paletteImage.MouseLeftButtonDown += new MouseButtonEventHandler(PaletteLeftButtonDown);
             //paletteImage.MouseRightButtonDown += new MouseButtonEventHandler(PaletteRightButtonDown);
 
-
             // init
             LoadPalette();
             currentColorIndex = 5;
@@ -129,11 +129,8 @@ void LoadPalette()
                 x = i % paletteResolutionX;
                 y = (i % len) / paletteResolutionX;
             }
-
-
         }
 
-
         void SetPixel(WriteableBitmap bitmap, int x, int y, int color)
         {
             try
@@ -278,7 +275,6 @@ void PaletteLeftButtonDown(object sender, MouseButtonEventArgs e)
 
         void UpdateCurrentColor()
         {
-            //            var col = Color.FromArgb(palette[currentColorIndex].Alpha, palette[currentColorIndex].Red, palette[currentColorIndex].Green, palette[currentColorIndex].Blue);
             var col = Color.FromArgb(currentColor.Alpha, currentColor.Red, currentColor.Green, currentColor.Blue);
             rectCurrentColor.Fill = new SolidColorBrush(col);
         }
@@ -377,7 +373,7 @@ private void OnClearButton(object sender, RoutedEventArgs e)
         // clears bitmap by re-creating it
         void ClearImage(WriteableBitmap target)
         {
-            canvasBitmap = new WriteableBitmap(canvasResolutionX, canvasResolutionY, dpiX, dpiY, PixelFormats.Bgr32, null);
+            canvasBitmap = new WriteableBitmap(canvasResolutionX, canvasResolutionY, dpiX, dpiY, PixelFormats.Bgra32, null);
             drawingImage.Source = canvasBitmap;
         }
 
@@ -417,5 +413,13 @@ public static void UseDefaultExtAsFilterIndex(FileDialog dialog)
             }
         }
 
+        private void OpacitySliderValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
+        {
+            var slider = sender as Slider;
+            opacity = (byte)slider.Value;
+            currentColor.Alpha = opacity;
+            // ... Set Window Title.
+            //this.Title = "Value: " + value.ToString("0.0") + "/" + slider.Maximum;
+        }
     } // class
 } // namespace