.net - NotImplementedException 来自 .NET 的 CustomLineCap 构造函数

Question

我想绘制一个自定义线帽 - 一个半径为 r 的等边三角形。显然我不能:

  Dim triangleSide As Single = CSng(3 * r / Math.Sqrt(3))
  Dim triangleHeight As Single = CSng(3 * r / 2)
  path = New GraphicsPath()
  Dim points() As PointF = New PointF() { _ 
      New PointF(-triangleSide / 2, 0), _ 
      New PointF(triangleSide / 2, 0), _
      New PointF(0, triangleHeight) }
  path.AddLines(points)

  ' Not Implemented Exception, Was is Das? '
  _HlpCap = New CustomLineCap(path, Nothing) 

我有什么问题还是只是一个框架错误？

编辑:

在 Mark Cidade 发表评论后，我尝试使用 (Nothing, path)它有帮助，但我需要填充三角形，而不仅仅是将其描边......

Answer 1

异常来自 GDI+ 库返回 NotImplemented状态来自其 GdipCreateCustomLineCap()功能。尝试传递笔划路径而不是 Nothing :

  Dim path2 As GraphicsPath = New GraphicsPath()
  path2.AddLines(points);
  _HlpCap = New CustomLineCap(path, path2)