add image scrolling (pan)

Author: unitycoder

PixelArtTool/MainWindow.xaml

@@ -89,6 +89,10 @@
 			<Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="256" Margin="89,50,0,0" VerticalAlignment="Top" Width="256">
 				<Image x:Name="imgOutline" IsHitTestVisible="False" HorizontalAlignment="Left" Height="256" Margin="-1" VerticalAlignment="Top" Width="256" Stretch="Fill" IsEnabled="False"/>
 			</Border>
+			<Button x:Name="btnScrollUp" Click="OnScrollButtonUpClicked" Content="/\" HorizontalAlignment="Left" Margin="388,252,0,0" VerticalAlignment="Top" Width="24"/>
+			<Button x:Name="btnScrollDown" Click="OnScrollButtonDownClicked" Content="\/" HorizontalAlignment="Left" Margin="388,274,0,0" VerticalAlignment="Top" Width="24"/>
+			<Button x:Name="btnScrollLeft" Click="OnScrollButtonLeftClicked" Content="&lt;" HorizontalAlignment="Left" Margin="361,263,0,0" VerticalAlignment="Top" Width="24"/>
+			<Button x:Name="btnScrollRight" Click="OnScrollButtonRightClicked" Content="&gt;" HorizontalAlignment="Left" Margin="415,262,0,0" VerticalAlignment="Top" Width="24"/>
 		</Grid>
 		<CheckBox x:Name="chkOutline" Content="Outline" HorizontalAlignment="Left" Margin="648,50,0,0" VerticalAlignment="Top" Width="64"/>
 		<Rectangle x:Name="rectCurrentColor" Fill="#FFF4F4F5" HorizontalAlignment="Left" Height="24" Margin="10,181,0,0" Stroke="Black" VerticalAlignment="Top" Width="24"/>

PixelArtTool/MainWindow.xaml.cs

@@ -765,6 +765,50 @@ void UpdateOutline()
                     SetPixel(outlineBitmap, x, y, (int)c.ColorBGRA);
                 }
             }
+        } // UpdateOutline()
+
+        void OnScrollButtonUpClicked(object sender, RoutedEventArgs e)
+        {
+            ScrollCanvas(0, -1);
+        }
+        void OnScrollButtonDownClicked(object sender, RoutedEventArgs e)
+        {
+            ScrollCanvas(0, 1);
+        }
+        void OnScrollButtonRightClicked(object sender, RoutedEventArgs e)
+        {
+            ScrollCanvas(1, 0);
+        }
+        void OnScrollButtonLeftClicked(object sender, RoutedEventArgs e)
+        {
+            ScrollCanvas(-1, 0);
+        }
+
+        void ScrollCanvas(int sx, int sy)
+        {
+            // clone canvas, FIXME not really needed..could just copy pixels to array or so..
+            var tempCanvasBitmap = new WriteableBitmap(canvasResolutionX, canvasResolutionY, dpiX, dpiY, PixelFormats.Bgra32, null);
+            tempCanvasBitmap = canvasBitmap.Clone();
+
+            // TODO add wrap or clamp option?
+
+            for (int x = 0; x < canvasResolutionX; x++)
+            {
+                for (int y = 0; y < canvasResolutionY; y++)
+                {
+                    var c = GetPixelColor(x, y, tempCanvasBitmap);
+                    int xx = Repeat(x + sx, canvasResolutionX);
+                    int yy = Repeat(y + sy, canvasResolutionY);
+                    SetPixel(canvasBitmap, xx, yy, (int)c.ColorBGRA);
+                }
+            }
+        }
+
+        int Repeat(int val, int max)
+        {
+            int result = val % max;
+            if (result < 0) result += max;
+            return result;
         }
 
     } // class