c# picturebox上画图

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在Form上添加一个pictureBox,一个button控件

如图所示：

这样我们的绘画面板就弄好了，把pictureBox的dock属性设置为fill，按键为清屏的作用。

private Point p1, p2;//定义两个点（启点，终点）private static bool drawing=false;//设置一个启动标志private void pictureBox1_MouseDown(object sender, MouseEventArgs e)        {                              p1 = new Point(e.X, e.Y);              p2 = new Point(e.X, e.Y);                drawing = true;                    }private void pictureBox1_MouseUp(object sender, MouseEventArgs e)        {            drawing = false;        }private void pictureBox1_MouseMove(object sender, MouseEventArgs e)        {                      Graphics g = pictureBox1.CreateGraphics();            if(e.Button ==MouseButtons.Left)            {                if (drawing)                {                    //drawing = true;                    Point currentPoint = new Point(e.X, e.Y);                    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;//消除锯齿                    g.DrawLine(new Pen(Color.Blue, 2),  p2,currentPoint);                                        p2.X = currentPoint.X;                    p2.Y = currentPoint.Y;                }            }                    }//清屏操作private void button1_Click(object sender, EventArgs e)        {            Graphics g = pictureBox1.CreateGraphics();            g.Clear(Color.White);        }

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