想做一个用GDI实现像windows画板一样的功能，但是不明白怎么样才能实现画笔拖动的时候能在画布上留下线，求指教啊。小弟新新手，求详细。。感激不尽。

//比如在Panel1上绘图
Point pStart;
Point pTemp;
Point pEnd;
int intFlag = 0;
private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            pStart = new Point(e.X, e.Y);
            intFlag = 1;
            a += 1;
            b += 1;
        }

        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            intFlag = 0;
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
           if (intFlag == 1)
             {
            Line l = new Line(pTemp, pEnd,  Color.Black,1);
            l.draw(this.panel1);
             }
            pTemp = pEnd;
        }

[ 本帖最后由 xydddaxia 于 2012-4-5 17:21 编辑 ]