C#--GDI+的LinearGradientBrush类

命名空间:System.Drawing.Drawing2D

LinearGradientBrush对象用颜色线性渐变填充图形。简言之，颜色渐变包含一种在两种指定的颜色之间渐变的颜色，渐变的方向是沿着指定角度的直线路径。例如：

 1 private void Form1_Paint(object sender, PaintEventArgs e)
 2 {
 3     Graphics g = e.Graphics;
 4     LinearGradientBrush lgb = new LinearGradientBrush(new Point(0,0),
 5     new Point(50,10),
 6     Color.White,
 7     Color.Black);
 8     g.FillRectangle(lgb,this.ClientRectangle);
 9     lgb.Dispose();
10 }

图形为：

使用矩形渐变：

 1  private void Form1_Paint(object sender, PaintEventArgs e)
 2 {
 3     Graphics g = e.Graphics;
 4     LinearGradientBrush lgb = new LinearGradientBrush(new Rectangle(0,0,50,50),
 5         Color.White,
 6         Color.Black,
 7         75f);   //75f 表示角度
 8     g.FillRectangle(lgb,this.ClientRectangle);
 9     lgb.Dispose();
10 }