本文章主要是利用窗体MouseDown、MouseUp事件及Pen、Graphics等类实现的。运行程序，当鼠标按下时，即绘图开始，记录绘图的起点坐标；当鼠标释放时，即绘图结束，记录绘图的终点坐标；当鼠标移动时，即绘制一条从起点到终点的直线。

下面给出的是主要代码：

Public Form1()

{

   InitializeComponent();

   Pen=new Pen(Color.FromName(“black”));//始末画笔

   Graphics=CreateGraphics();//初始画板

  

}

Public bool G_OnMouseDown=false;

Public point lastPoint =Point.Empty;

Public pen pen;

Public Grapics graphics;

Private void Form1_MouseMove(object sender,MouseEventArgs e)

{

   If(lastPoint.Equals(point.Empty))

{lastPont = new Point(e.X,e.Y);}

   If(G_OnMouseDown)

{

   Point cruuPoint = new Point(e.X,e.Y);

   Graphics.DrawLine(pen,cruuPoint,lastPoint);

}

  lastPont =new  Point(e.X,e.Y);

}

//当鼠标离开时把布尔变量设成false

Private void Form1_MouseUp(object sender,MouseEventArgs e)

{

  G_OnMouseDown=false;

}

Private void Form1_MouseDown(object sender,MouseEventArgs e)

{

  G_OnMouseDown=true;

}

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