更新时间:2023-01-23 10:20:38
您可以将 ImageDrawing 放入 Image 控件中,然后将其渲染到 RenderTargetBitmap,它是一个 BitmapSource,因此可以通过 BitmapEncoder(本例中为 PngBitmapEncoder).
You may put the ImageDrawing into an Image control and render that into a RenderTargetBitmap, which is a BitmapSource and can therefore be serialized by a BitmapEncoder (PngBitmapEncoder in this example).
public void SaveDrawingToFile(Drawing drawing, string fileName, double scale)
{
var drawingImage = new Image { Source = new DrawingImage(drawing) };
var width = drawing.Bounds.Width * scale;
var height = drawing.Bounds.Height * scale;
drawingImage.Arrange(new Rect(0, 0, width, height));
var bitmap = new RenderTargetBitmap((int)width, (int)height, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(drawingImage);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmap));
using (var stream = new FileStream(fileName, FileMode.Create))
{
encoder.Save(stream);
}
}
请注意,您实际上并不需要 BitmapImage 进行编码,因为 BitmapSource(或任何派生类,如 RenderTargetBitmap)将被接受为 BitmapFrame.Create.
Note that you don't actually need a BitmapImage for encoding, because BitmapSource (or any derived class like RenderTargetBitmap) will be accepted as argument to BitmapFrame.Create.
稍微不同的解决方案将涉及 DrawingVisual 而不是 DrawingImage:
A slightly different solution would involve a DrawingVisual instead of a DrawingImage:
public void SaveDrawingToFile(Drawing drawing, string fileName, double scale)
{
var drawingVisual = new DrawingVisual();
using (var drawingContext = drawingVisual.RenderOpen())
{
drawingContext.PushTransform(new ScaleTransform(scale, scale));
drawingContext.PushTransform(new TranslateTransform(-drawing.Bounds.X, -drawing.Bounds.Y));
drawingContext.DrawDrawing(drawing);
}
var width = drawing.Bounds.Width * scale;
var height = drawing.Bounds.Height * scale;
var bitmap = new RenderTargetBitmap((int)width, (int)height, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(drawingVisual);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(bitmap));
using (var stream = new FileStream(fileName, FileMode.Create))
{
encoder.Save(stream);
}
}