c# picturebox上画图
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);
- }