/// <summary>
/// Creates image from canvas with map background.
/// </summary>
/// <param name="mapImage">Map image.</param>
/// <param name="canvas">Canvas to draw.</param>
/// <returns>Created image.</returns>
private Image _CreateImage(MapImage mapImage, SysControls.Canvas canvas)
{
Debug.Assert(null != mapImage);
Debug.Assert(null != canvas);
Image imageWithData = null;
RenderTargetBitmap bmp = null;
SysControls.Canvas outer = null;
Image sourceImage = null;
using (MemoryStream sourceStream = new MemoryStream((byte[])mapImage.ImageData))
sourceImage = Image.FromStream(sourceStream);
try
{
var bitmap = sourceImage as Bitmap;
Debug.Assert(null != bitmap);
ImageBrush imageBrush = _CreateImageBrush(bitmap);
outer = new SysControls.Canvas();
outer.Width = mapImage.ImageWidth;
outer.Height = mapImage.ImageHeight;
outer.Children.Add(canvas);
outer.Background = (ImageBrush)imageBrush.GetCurrentValueAsFrozen();
outer.Arrange(new Rect(0, 0, outer.Width, outer.Height));
bmp = new RenderTargetBitmap((int)outer.Width,
(int)outer.Height,
mapImage.ImageDPI,
mapImage.ImageDPI,
PixelFormats.Pbgra32);
bmp.Render(outer);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bmp));
using (MemoryStream stream = new MemoryStream())
{
encoder.Save(stream);
imageWithData = Image.FromStream(stream);
}
}
finally
{ // Clear and dispose all used stuff
if (outer != null)
{
outer.UpdateLayout();
outer.Children.Clear();
}
canvas.UpdateLayout();
foreach (object child in canvas.Children)
{
var symbolControl = child as SymbolControl;
if (symbolControl != null)
{
symbolControl.Template = null;
}
}
canvas.Children.Clear();
if (bmp != null)
{
bmp.Clear();
}
if (sourceImage != null)
{
sourceImage.Dispose();
}
}
return(imageWithData);
}