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在 C# 中使用画笔

  
  public class Rectangle : Shape
  {
  protected Point m_Start;
  protected Point m_End;
  public Rectangle(Point start, Point end, Color fgColor)
  {
  m_Start = start;
  m_End = end;
  m_Color = fgColor;
  }
  public override void Draw(Form canvas)
  {
  if (canvas == null)
  {
  return;
  }
  InitializeGraphics(canvas);
  Point startPoint = canvas.PointToScreen(m_Start);
  Point endPoint = canvas.PointToScreen(m_End);
  MainForm mainForm = (MainForm)canvas;
  Color bgColor = GetBackgroundColor(m_Color);
  Size rectSize = new Size(m_End.X - m_Start.X, m_End.Y - m_Start.Y);
  System.Drawing.Rectangle rectToDraw = new System.Drawing.Rectangle(startPoint, rectSize);
  ControlPaint.DrawReversibleFrame(rectToDraw, bgColor, FrameStyle.Thick);
  }
  }
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