WPF：是否可以使用GeometryDrawing渲染一个圆？ [英] WPF: is it possible to render a circle using GeometryDrawing?

问题描述

 < DrawingImage x：Key ={ComponentResourceKey TypeInTargetAssembly = { x：键入wpfhlp：FokusGroupBox}，ResourceId = IconTest}> 
< DrawingImage.Drawing> 
< DrawingGroup> 
< GeometryDrawing Brush =BlackGeometry =M0,260 L0,600 L110,670 L110,500 L190,550 L190,710 L300,775 L300,430 L150,175/> 
< / DrawingGroup> 
 < / DrawingImage> 
  

现在我想绘制一个圆圈，但我只能找到移动，绘制

有没有办法让GeometryDrawing绘制一个圆圈？

解决方案

  .... 
< GeometryDrawing Brush =Black> 
< GeometryDrawing.Geometry> 
< EllipseGeometry Center =0,0RadiusX =1RadiusY =1/> 
< /GeometryDrawing.Geometry> 
< / GeometryDrawing> 
  

或者，您也可以使用路径标记语法来绘制两个椭圆弧（圈的上半部和下半部）：

 < GeometryDrawing Brush =BlackGeometry =M -1,0 A 1,1 0 1 1 1,0 M -1,0 A 1,1 0 1 0 1,0/> 
  

I've got a GeometryDrawing similar like this:

<DrawingImage x:Key="{ComponentResourceKey TypeInTargetAssembly={x:Type wpfhlp:FokusGroupBox},ResourceId=IconTest}">
  <DrawingImage.Drawing>
    <DrawingGroup>
      <GeometryDrawing Brush="Black" Geometry="M0,260 L0,600 L110,670 L110,500 L190,550 L190,710 L300,775 L300,430 L150,175"/>
    </DrawingGroup>
  </DrawingImage.Drawing>
</DrawingImage>

Now I'd like to draw a circle instead, but I only can find commands to move, draw a line, nothing to draw a circle.

Is there some way to get the GeometryDrawing to draw a circle?

解决方案

....
<GeometryDrawing Brush="Black">
    <GeometryDrawing.Geometry>
        <EllipseGeometry Center="0,0" RadiusX="1" RadiusY="1" />
    </GeometryDrawing.Geometry>
</GeometryDrawing>

Alternatively, you can also use Path Markup Syntax to draw two elliptic arcs (upper and lower half of the circle):

<GeometryDrawing Brush="Black" Geometry="M -1,0 A 1,1 0 1 1 1,0 M -1,0 A 1,1 0 1 0 1,0" />

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