GDI+基础知识——画笔的变换（缩放及旋转）

  private void Pen_Tranform_Click(object sender, System.EventArgs e)
  {
   Graphics graphics = this.CreateGraphics();
   graphics.Clear(Color.White);
   //让图像显示更精致
   graphics.SmoothingMode = SmoothingMode.HighQuality;
   //构造一支宽度为5的红色画笔
   Pen pen  =  new Pen(Color.Red,3.5f);
   //绘制原始画笔
   graphics.DrawEllipse(pen,0,50,80,80);
   graphics.TranslateTransform(100,0);
   //将画笔从垂直方向扩充6倍，水平方向保持不变
   pen.ScaleTransform(.5f,6f);
//   pen.DashStyle = DashStyle.DashDotDot;
   //使用未经旋转处理的画笔画圆
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
   //60°旋转
   graphics.TranslateTransform(100,0);
   pen.RotateTransform(60,MatrixOrder.Append);
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
   //120°旋转
   graphics.TranslateTransform(100,0);
   pen.RotateTransform(60, MatrixOrder.Append);
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
   //180°旋转
   graphics.TranslateTransform(100,0);
   pen.RotateTransform(60, MatrixOrder.Append);
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
  }