将 XAML 形状绘制到 DrawingContext？

发布于 2024-10-13 09:04:29 字数 671 浏览 2 评论 0原文

我有几个由 WPF 形状基元组成的常见符号（例如矩形、直线、路径等）。这些符号当前作为用户控件存储在 xaml 文件中。例如：

<Canvas x:Name="Symbol" Width="100" Height="100">
    <Rectangle x:Name="Rectangle" Width="100" Height="100" Stretch="Fill">
        <Rectangle.Fill>
            <SolidColorBrush Color="Aqua"></SolidColorBrush>
        </Rectangle.Fill>
    </Rectangle>
</Canvas>

上面是一个简单的例子，但我的大多数符号都比较复杂，由许多不同的部分组成。因此，我希望使用这些用户控件来存储符号并使它们易于操作。

我正在 Canvas 的 OnRender 方法中进行大量绘图，并希望在绘图中包含其中一些复合符号。是否可以将它们转换为某种格式以将它们绘制到 DrawingContext？我知道有一个名为 DrawingContext.DrawImage 的方法，但这需要 ImageSource 作为输入。

任何想法将不胜感激。

谢谢，艾伦

原文

I have several common symbols that have been composed of WPF shape primatives (e.g. Rectangle, Line, Path etc). These symbols are currently stored in xaml files as user controls. For example:

<Canvas x:Name="Symbol" Width="100" Height="100">
    <Rectangle x:Name="Rectangle" Width="100" Height="100" Stretch="Fill">
        <Rectangle.Fill>
            <SolidColorBrush Color="Aqua"></SolidColorBrush>
        </Rectangle.Fill>
    </Rectangle>
</Canvas>

The above is a simple example but most of my symbols are more complex and composed of many different parts. So, I was hoping to use these user controls to store the symbols and make them easy to manipulate.

I am doing quite a bit of drawing in the OnRender method of a Canvas and would like to include some of these composite symbols in my drawing. Is it possible get these into a format to draw them to the DrawingContext? I am aware that there is a method called DrawingContext.DrawImage but this takes an ImageSource as input.

Any ideas would be much appreciated.

Thanks,
Alan

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此生挚爱伱 2024-10-20 09:04:29

如果您将画布制作成图像源，则可以使用drawimage，例如：

VisualBrush vb = new VisualBrush(canvas);
GeometryDrawing gd = new GeometryDrawing(vb, new Pen(Brushes.Transparent, 0), new RectangleGeometry(new Rect(0, 0, width, height)));
img = new DrawingImage(gd);

You can use drawimage if you make your canvas into an imagesource like:

VisualBrush vb = new VisualBrush(canvas);
GeometryDrawing gd = new GeometryDrawing(vb, new Pen(Brushes.Transparent, 0), new RectangleGeometry(new Rect(0, 0, width, height)));
img = new DrawingImage(gd);

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