C＃将线高调整为椭圆 [英] C# make line height adjust to ellipse

问题描述

使用下面的代码绘制椭圆：

  graphGraphics = e.Graphics; 
 
 graphGraphics.FillEllipse（新的SolidBrush（Color.White），this.graphBoundries）; 
 graphGraphics.DrawEllipse（graphPen，this.graphBoundries）; 
  

我在这张图上有一条线，它现在正好穿过它。我想改变线的高度以适应椭圆的边界如下，所以它不会通过椭圆：

http://i1379.photobucket.com/albums/ah134/fac7orx2/circlewithlinehelp_zps280d9e76.png

有谁知道一个算法来做到这一点？或者，甚至可能是如何获得椭圆的边界而不仅仅是矩形的边界？解析方案

为了扩展我的评论，尝试一下像这样（未经测试）的代码：

  graphGraphics = e.Graphics; 
 
 graphGraphics.FillEllipse（新的SolidBrush（Color.White），this.graphBoundries）; 
 graphGraphics.DrawEllipse（graphPen，this.graphBoundries）; 
 
 GraphicsPath clipPath = new GraphicsPath（）; 
 clipPath.AddEllipse（this.graphBoundaries）; 
 
 graphGraphics.SetClip（clipPath，CombineMode.Replace）; 
 
 //画线
  

There is an ellipse drawn with the following code:

graphGraphics = e.Graphics;

graphGraphics.FillEllipse(new SolidBrush(Color.White), this.graphBoundries);
graphGraphics.DrawEllipse(graphPen, this.graphBoundries);

I have a line on this graph and it currently just passes right through it. I want to change the lines height to adjust to the ellipse's boundaries as follows so it wont pass through the ellipse:

http://i1379.photobucket.com/albums/ah134/fac7orx2/circlewithlinehelp_zps280d9e76.png

Does anyone know an algorithm to do this? Or maybe even how to just get the ellipse's boundaries and not just the rectangular boundaries?

解决方案

To expand on my comment, try something like this (untested) code:

graphGraphics = e.Graphics;

graphGraphics.FillEllipse(new SolidBrush(Color.White), this.graphBoundries);
graphGraphics.DrawEllipse(graphPen, this.graphBoundries);

GraphicsPath clipPath = new GraphicsPath();
clipPath.AddEllipse(this.graphBoundaries);

graphGraphics.SetClip(clipPath, CombineMode.Replace);

// draw your line

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