![](/img/trans.png)
[英]WPF, C#, Ink Canvas, Image - How to save inkcanvas on existing image and save it as new image?
[英][C#][WPF] How to save multiple canvas as an image?
我只是环顾四周,试图制作一个将多个画布保存为一个图像的工作版本。 例如,将它们保存在彼此附近会很好,但是我不知道该怎么做。
public static void CreateSaveBitmap(Canvas canvas1, Canvas canvas2, string filename)
{
RenderTargetBitmap renderBitmap1 = new RenderTargetBitmap((int)canvas1.ActualWidth, (int)canvas1.ActualWidth, 96d, 96d, PixelFormats.Pbgra32);
// needed otherwise the image output is black
canvas1.Measure(new Size((int)canvas1.ActualWidth, (int)canvas1.ActualWidth));
canvas1.Arrange(new Rect(new Size((int)canvas1.ActualWidth, (int)canvas1.ActualWidth)));
renderBitmap1.Render(canvas1);
RenderTargetBitmap renderBitmap2 = new RenderTargetBitmap((int)canvas2.ActualWidth, (int)canvas2.ActualWidth, 96d, 96d, PixelFormats.Pbgra32);
// needed otherwise the image output is black
canvas2.Measure(new Size((int)canvas2.ActualWidth, (int)canvas2.ActualWidth));
canvas2.Arrange(new Rect(new Size((int)canvas2.ActualWidth, (int)canvas2.ActualWidth)));
renderBitmap2.Render(canvas2);
//JpegBitmapEncoder encoder = new JpegBitmapEncoder();
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap1));
encoder.Frames.Add(BitmapFrame.Create(renderBitmap2));
using (FileStream file = File.Create(filename))
{
encoder.Save(file);
}
}
这是我尝试过的方法,但它仅保存第一张图像。 有人可以帮我解决这个问题吗?
UPDATE
我更正了@TheLethalCoder所说的一些错误,并且我还将输出文件类型更改为Tiff,但没有帮助。 现在是最新版本:
public static void CreateSaveBitmap(Canvas canvas1, Canvas canvas2, string filename)
{
RenderTargetBitmap renderBitmap1 = new RenderTargetBitmap((int)canvas1.ActualWidth, (int)canvas1.ActualHeight, 96d, 96d, PixelFormats.Pbgra32);
// needed otherwise the image output is black
canvas1.Measure(new Size((int)canvas1.ActualWidth, (int)canvas1.ActualHeight));
canvas1.Arrange(new Rect(new Size((int)canvas1.ActualWidth, (int)canvas1.ActualHeight)));
renderBitmap1.Render(canvas1);
RenderTargetBitmap renderBitmap2 = new RenderTargetBitmap((int)canvas2.ActualWidth, (int)canvas2.ActualHeight, 96d, 96d, PixelFormats.Pbgra32);
// needed otherwise the image output is black
canvas2.Measure(new Size((int)canvas2.ActualWidth, (int)canvas2.ActualHeight));
canvas2.Arrange(new Rect(new Size((int)canvas2.ActualWidth, (int)canvas2.ActualHeight)));
renderBitmap2.Render(canvas2);
//JpegBitmapEncoder encoder = new JpegBitmapEncoder();
TiffBitmapEncoder encoder = new TiffBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderBitmap1));
encoder.Frames.Add(BitmapFrame.Create(renderBitmap2));
using (FileStream file = File.Create(filename))
{
encoder.Save(file);
}
}
您想要的不是多帧图像,而是通过将画布的图像并置来组合它们。 因此,实际上,您在这里只需要1个框架,但需要一个大框架。 有一些方法可以将它们组合在一起,但是可以使用DrawingVisual
一种简单的方法。 我们可以在该视觉上绘制一个Drawing并使用RenderTargetBitmap
捕获它。 我们使用DrawingGroup
组合ImageDrawing
(来自2个RenderTargetBitmaps)。 总而言之,我们必须执行以下步骤:从2个RenderTargetBitmaps中,将它们放入2个ImageDrawings中,然后将它们组合到DrawingGroup中。 然后,在DrawingVisual上绘制该合并的Drawing。 最后,使用RenderTargetBitmap
正常渲染该视觉效果。
这是您可以尝试的代码:
public static void CreateSaveBitmap(Canvas canvas1, Canvas canvas2, string filename)
{
RenderTargetBitmap renderBitmap1 = new RenderTargetBitmap((int)canvas1.ActualWidth, (int)canvas1.ActualHeight, 96d, 96d, PixelFormats.Pbgra32);
canvas1.Measure(new Size((int)canvas1.ActualWidth, (int)canvas1.ActualHeight));
canvas1.Arrange(new Rect(new Size((int)canvas1.ActualWidth, (int)canvas1.ActualHeight)));
renderBitmap1.Render(canvas1);
RenderTargetBitmap renderBitmap2 = new RenderTargetBitmap((int)canvas2.ActualWidth, (int)canvas2.ActualHeight, 96d, 96d, PixelFormats.Pbgra32);
canvas2.Measure(new Size((int)canvas2.ActualWidth, (int)canvas2.ActualHeight));
canvas2.Arrange(new Rect(new Size((int)canvas2.ActualWidth, (int)canvas2.ActualHeight)));
renderBitmap2.Render(canvas2);
//Combine the images here
var dg = new DrawingGroup();
var id1 = new ImageDrawing(renderBitmap1,
new Rect(0,0,renderBitmap1.Width, renderBitmap1.Height));
var id2 = new ImageDrawing(renderBitmap2,
new Rect(renderBitmap1.Width, 0
renderBitmap2.Width,
renderBitmap2.Height));
dg.Children.Add(id1);
dg.Children.Add(id2);
var combinedImg = new RenderTargetBitmap((int)(renderBitmap1.Width + renderBitmap2.Width + 0.5),
(int)(Math.Max(renderBitmap1.Height, renderBitmap2.Height) + 0.5), 96, 96, PixelFormats.Pbgra32);
var dv = new DrawingVisual();
using(var dc = dv.RenderOpen()){
dc.DrawDrawing(dg);
}
combinedImg.Render(dv);
//JpegBitmapEncoder encoder = new JpegBitmapEncoder();
PngBitmapEncoder encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(combinedImg));
using (FileStream file = File.Create(filename)) {
encoder.Save(file);
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.