用gdi+怎么画圆环

Question

如题，画完圆环后，用颜色怎么填充，两边颜色一样
向中间颜色线性过渡
如何实现？

Answer 1

                System.Drawing.Graphics g = this.CreateGraphics();
                g.DrawEllipse(new Pen(new System.Drawing.SolidBrush(Color.Black),10f),new Rectangle(new Point(0,0),new Size(50,50)));把画笔调粗点就是圆环了。

Answer 2

楼主，告诉你一个秘密：GDI+里面有一个路径渐变画笔
下面是我的代码，仅供参考：private Bitmap MyDrawEllipse(Point StartPoint, int Size, Color SurroundColor, Color CenterColor)
{
    Bitmap b = new Bitmap(500, 500);
    Graphics g = Graphics.FromImage(b);
    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;    Rectangle myRectangle = new Rectangle(StartPoint, new Size(Size, Size));    GraphicsPath path = new GraphicsPath();
    path.AddEllipse(myRectangle);
    PathGradientBrush pthGrBrush = new PathGradientBrush(path);    pthGrBrush.CenterColor = CenterColor;    Color[] SurroundColors = { SurroundColor };
    pthGrBrush.SurroundColors = SurroundColors;    g.FillEllipse(pthGrBrush, myRectangle);    //再画一遍边缘，这样圆不会看起来有毛边
    g.DrawEllipse(new Pen(SurroundColor), myRectangle);    return b;
}