C#控件picturebox实现画图功能

来源：jb51　　时间：2018/9/25 19:01:19　　对本文有异议

本文实例为大家分享了C# picturebox实现画图功能的具体代码，供大家参考，具体内容如下

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);
}