如:
private void picMain_MouseMove(object sender, MouseEventArgs e)
{
Graphics g= Graphics.FromHwnd(picMain.Handle);Pen myPen = new Pen(Color.Red);
myPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;if(e.Button.ToString()=="Left")
{g.DrawRectangle(myPen,startX,startY,Math.Abs(startX-e.X),Math.Abs(startY-e.Y
));}}
private void picMain_MouseMove(object sender, MouseEventArgs e)
{
Graphics g= Graphics.FromHwnd(picMain.Handle);Pen myPen = new Pen(Color.Red);
myPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;if(e.Button.ToString()=="Left")
{g.DrawRectangle(myPen,startX,startY,Math.Abs(startX-e.X),Math.Abs(startY-e.Y
));}}
解决方案 »
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