private BitmapImage GetImageSource()
{
MemoryStream streamSource = null;
if (PreviewWidth != 0 && PreviewHeight != 0 && Width != 0 && Height != 0 && LegendItems.Count > 0)
{
Bitmap nativeImage = new Bitmap(PreviewWidth, PreviewHeight);
PlatformGeoCanvas geoCanvas = new PlatformGeoCanvas
{
CompositingQuality = CompositingQuality.HighSpeed,
SmoothingMode = SmoothingMode.HighSpeed,
DrawingQuality = DrawingQuality.CanvasSettings,
};
LegendAdornmentLayer tmpLegendAdornmentLayer = ToLegendAdornmentLayer();
double left = -tmpLegendAdornmentLayer.Width * .5;
double top = tmpLegendAdornmentLayer.Height * .5;
double right = left + tmpLegendAdornmentLayer.Width;
double bottom = top - tmpLegendAdornmentLayer.Height;
geoCanvas.BeginDrawing(nativeImage, new RectangleShape(left, top, right, bottom), GeographyUnit.Meter);
simpleCandidates.Clear();
tmpLegendAdornmentLayer.Draw(geoCanvas, simpleCandidates);
geoCanvas.EndDrawing();
streamSource = new MemoryStream();
nativeImage.Save(streamSource, ImageFormat.Png);
}
BitmapImage previewSource = new BitmapImage();
if (streamSource != null)
{
previewSource.BeginInit();
previewSource.StreamSource = streamSource;
previewSource.EndInit();
previewSource.Freeze();
}
return(previewSource);
}
