问题
The RenderTargetBitmap class worked with simple Canvas + InkManager (in Windows 8.1) to render ink strokes to an image.
UWP introduced InkCanvas and a new Inking API. However, it seems like the RenderTargetBitmap
does not work with that. When I try to capture ink strokes with RenderAsync
method, no ink strokes get rendered only other objects like Rectangle and so on.
Is it a bug or this new API is not meant to be used this way? If not, then how can I render an image out of InkCanvas
?
Thanks!
回答1:
Here is how I solved this issue with Win2D.
First of all, add Win2D.uwp
nuget package to your project.
Then use this code:
CanvasDevice device = CanvasDevice.GetSharedDevice();
CanvasRenderTarget renderTarget = new CanvasRenderTarget(device, (int)inkCanvas.ActualWidth, (int)inkCanvas.ActualHeight, 96);
using (var ds = renderTarget.CreateDrawingSession())
{
ds.Clear(Colors.White);
ds.DrawInk(inkCanvas.InkPresenter.StrokeContainer.GetStrokes());
}
using (var fileStream = await file.OpenAsync(FileAccessMode.ReadWrite))
await renderTarget.SaveAsync(fileStream, CanvasBitmapFileFormat.Jpeg, 1f);
回答2:
Please try InkPresenter.StrokeContainer property http://blogs.windows.com/buildingapps/2015/09/08/going-beyond-keyboard-mouse-and-touch-with-natural-input-10-by-10/
来源:https://stackoverflow.com/questions/32153880/how-to-render-inkcanvas-to-an-image-in-uwp-windows-10-application