c#-将inkCanvas中的图像另存为png或jpeg文件

这是我的WPF代码
< InkCanvas x：Name =“ inkCanvas” Margin =“ 9,325,210,193” Background =“ Azure”>< / InkCanvas>
还有一个按钮
当按下按钮时,我想将绘制的图像保存到文件中.这是我的代码

  private void button1_Click(object sender, RoutedEventArgs e)
    {
        int margin = (int)inkCanvas.Margin.Left;
        int width = (int)inkCanvas.ActualWidth - margin;
        int height = (int)inkCanvas.ActualHeight - margin;
        RenderTargetBitmap rtb = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Default);
        rtb.Render(inkCanvas);


        using (FileStream fs = new FileStream("path", FileMode.Create))
        {
            BitmapEncoder encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(rtb));
            encoder.Save(fs);
        }
    }

但是,如果用油漆打开,则显示的图像全是黑色(从浏览器中掠过)或白色.
我该怎么做才能完全获得绘制的图像？ ty.

解决方法:

问题是您试图将矢量图形另存为位图,那是不可能的,因此首先需要绘制矢量,然后保存图形

此类将Ink绘制到现有位图上

public class InkImage
{
    public static BitmapFrame MergeInk(StrokeCollection ink, BitmapSource background)
    {
        DrawingVisual drawingVisual = new DrawingVisual();
        using (DrawingContext drawingContext = drawingVisual.RenderOpen())
        {
            drawingContext.DrawImage(background, new Rect(0, 0, background.Width, background.Height));

            foreach (var item in ink)
            {
                item.Draw(drawingContext);
            }
            drawingContext.Close();
            var bitmap = new RenderTargetBitmap((int)background.Width, (int)background.Height, background.DpiX, background.DpiY, PixelFormats.Pbgra32);
            bitmap.Render(drawingVisual);
            return BitmapFrame.Create(bitmap);
        }
    }
}

然后您可以使用JPEG或PNG编码器保存位图

标签：png,save,inkcanvas,wpf,c
来源： https://codeday.me/bug/20191026/1936759.html