private ImageSource GetPreviewSourceFromStyle(Style style)
{
if (style != null)
{
System.Drawing.Bitmap nativeImage = new System.Drawing.Bitmap(20, 20);
MemoryStream streamSource = new MemoryStream();
try
{
var geoCanvas = new PlatformGeoCanvas();
geoCanvas.BeginDrawing(nativeImage, new RectangleShape(-10, 10, 10, -10), GeographyUnit.DecimalDegree);
geoCanvas.Clear(new GeoSolidBrush(GeoColor.StandardColors.White));
style.DrawSample(geoCanvas);
geoCanvas.EndDrawing();
nativeImage.Save(streamSource, System.Drawing.Imaging.ImageFormat.Png);
BitmapImage imageSource = new BitmapImage();
imageSource.BeginInit();
imageSource.StreamSource = streamSource;
imageSource.EndInit();
return(imageSource);
}
catch (Exception ex)
{
GisEditor.LoggerManager.Log(LoggerLevel.Debug, ex.Message, new ExceptionInfo(ex));
return(new BitmapImage());
}
finally
{
nativeImage.Dispose();
}
}
else
{
return(null);
}
}
public GeoImage ToGeoImage(RectangleShape worldExtent, GeographyUnit drawingMapUnit)
{
// only support SingleTile mode, otherwise return the background image directly
if (TileType != TileType.SingleTile)
{
if (BackgroundImage == null)
{
return(null);
}
else
{
return(new GeoImage(BackgroundImage.GetImageStream()));
}
}
// find any layer tiles in this overlay
var layerTiles = new List <LayerTile>();
foreach (var overlayUIElement in OverlayCanvas.Children)
{
if (overlayUIElement is Canvas)
{
foreach (var canvasUIElement in (overlayUIElement as Canvas).Children)
{
if (canvasUIElement is LayerTile)
{
layerTiles.Add(canvasUIElement as LayerTile);
}
}
}
}
GeoImage geoImage = null;
if (layerTiles.Count > 0)
{
int width = Convert.ToInt32(layerTiles.First().ActualWidth);
int height = Convert.ToInt32(layerTiles.First().ActualHeight);
if (width > 0 && height > 0)
{
// initialize geoCanvas by using current BackgroundImage
var geoCanvas = new PlatformGeoCanvas();
if (BackgroundImage == null)
{
geoImage = new GeoImage(width, height);
geoCanvas.BeginDrawing(geoImage, worldExtent, drawingMapUnit);
geoCanvas.Clear(new GeoSolidBrush(GeoColors.Transparent));
}
else
{
geoImage = new GeoImage(BackgroundImage.GetImageStream());
geoCanvas.BeginDrawing(geoImage, worldExtent, drawingMapUnit);
}
// draw each layer tiles
foreach (var layerTile in layerTiles)
{
layerTile.Draw(geoCanvas);
}
geoCanvas.EndDrawing();
}
}
return(geoImage);
}