[转]C# WinForm 绘制圆角窗体

本文转自：http://blog.csdn.net/Terry001/archive/2008/05/01/2352511.aspx

public void SetWindowRegion()
{
System.Drawing.Drawing2D.GraphicsPath FormPath;
FormPath = new System.Drawing.Drawing2D.GraphicsPath();
Rectangle rect=new Rectangle(0,22,this.Width,this.Height-22);//this.Left-10,this.Top-10,this.Width-10,this.Height-10);
FormPath = GetRoundedRectPath(rect, 30);
this.Region = new Region(FormPath);
}
private GraphicsPath GetRoundedRectPath(Rectangle rect, int radius)
{
int diameter = radius;
Rectangle arcRect = new Rectangle(rect.Location, new Size(diameter, diameter));
GraphicsPath path = new GraphicsPath();
// 左上角
path.AddArc(arcRect, 180, 90);
// 右上角
arcRect.X = rect.Right - diameter;
path.AddArc(arcRect, 270, 90);
// 右下角
arcRect.Y = rect.Bottom - diameter;
path.AddArc(arcRect, 0, 90);
// 左下角
arcRect.X = rect.Left;
path.AddArc(arcRect, 90, 90);
path.CloseFigure();
return path;
}
protected override void OnResize(System.EventArgs e)
{
this.Region = null;
SetWindowRegion();
}