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); 
} 
} 

作者:jspfuns(原创)

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