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);
}
