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I have found workaround, I have used RenderTargetBitmap.RenderAsync on instance SfDiagram, work fine, but this solution has restriction: diagram must be in Visual Tree!
protected async Task<IRandomAccessStream> GenerateImage(UIElement diagram)
{
// Render to an image at the current system scale and retrieve pixel contents
var renderTargetBitmap = new RenderTargetBitmap();
// unselect all nodes
ObservableCollection<TraNode> nodes = ((diagram as SfDiagram).Nodes as ObservableCollection<TraNode>);
if(nodes != null && nodes.Count > 0)
{
foreach (var node in nodes)
{
node.IsSelected = false;
}
}
await renderTargetBitmap.RenderAsync(diagram);
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
var pixelBytes = new byte[pixelBuffer.Length];
using (var reader = DataReader.FromBuffer(pixelBuffer))
{
reader.ReadBytes(pixelBytes);
}
IRandomAccessStream stream = new InMemoryRandomAccessStream();
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Straight,
(uint)renderTargetBitmap.PixelWidth,
(uint)renderTargetBitmap.PixelHeight,
DisplayInformation.GetForCurrentView().LogicalDpi,
DisplayInformation.GetForCurrentView().LogicalDpi,
pixelBytes);
await encoder.FlushAsync();
return stream;
}
I have used this method to export image from diagram layers as PNG to PDF, here is a result:
Martin
