add saving to png file

Author: unitycoder

PixelArtTool/MainWindow.xaml

@@ -12,7 +12,7 @@
 				<Button x:Name="btnNew" ToolTip="New (clear image)" Click="OnClearButton">
 					<Image Source="/Resources/Buttons/emptybutton.png" />
 				</Button>
-				<Button x:Name="btnSave" ToolTip="Save.." Click="OnSaveButton">
+				<Button x:Name="btnSave" ToolTip="Save as.." Click="OnSaveButton">
 					<Image Source="/Resources/Buttons/emptybutton.png" />
 				</Button>
 			</ToolBar>

PixelArtTool/MainWindow.xaml.cs

@@ -1,5 +1,6 @@
 using Microsoft.Win32;
 using System;
+using System.IO;
 using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Controls;
@@ -391,7 +392,12 @@ private void OnSaveButton(object sender, RoutedEventArgs e)
 
             if (saveFileDialog.ShowDialog() == true)
             {
-                Console.WriteLine("TODO: save image to " + saveFileDialog.FileName);
+                FileStream stream = new FileStream(saveFileDialog.FileName, FileMode.Create);
+                PngBitmapEncoder encoder = new PngBitmapEncoder();
+                encoder.Interlace = PngInterlaceOption.On;
+                encoder.Frames.Add(BitmapFrame.Create(canvasBitmap));
+                encoder.Save(stream);
+                stream.Close();
             }
         }