在 C# 中使用畫筆

　　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 = canvasPointToScreen(m_Start);
　　Point endPoint = canvasPointToScreen(m_End);
　　MainForm mainForm = (MainForm)canvas;
　　Color bgColor = GetBackgroundColor(m_Color);
　　Size rectSize = new Size(m_EndX m_StartX m_EndY m_StartY);
　　SystemDrawingRectangle rectToDraw = new SystemDrawingRectangle(startPoint rectSize);
　　ControlPaintDrawReversibleFrame(rectToDraw bgColor FrameStyleThick);
　　}
　　}
From:http://tw.wingwit.com/Article/program/net/201311/13468.html