GDI+基礎知識——畫筆的變換（縮放及旋轉）

  private void Pen_Tranform_Click(object sender, System.EventArgs e)
  {
   Graphics graphics = this.CreateGraphics();
   graphics.Clear(Color.White);
   //讓映像顯示更精緻
   graphics.SmoothingMode = SmoothingMode.HighQuality;
   //構造一支寬度為5的紅色畫筆
   Pen pen  =  new Pen(Color.Red,3.5f);
   //繪製原始畫筆
   graphics.DrawEllipse(pen,0,50,80,80);
   graphics.TranslateTransform(100,0);
   //將畫筆從垂直方向擴充6倍，水平方向保持不變
   pen.ScaleTransform(.5f,6f);
//   pen.DashStyle = DashStyle.DashDotDot;
   //使用未經旋轉處理的畫筆畫圓
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
   //60°旋轉
   graphics.TranslateTransform(100,0);
   pen.RotateTransform(60,MatrixOrder.Append);
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
   //120°旋轉
   graphics.TranslateTransform(100,0);
   pen.RotateTransform(60, MatrixOrder.Append);
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
   //180°旋轉
   graphics.TranslateTransform(100,0);
   pen.RotateTransform(60, MatrixOrder.Append);
   graphics.DrawEllipse(pen, 0, 50, 80, 80);
  }