private void pbImg_MouseMove(object sender, MouseEventArgs e) { Thread.Sleep(6);//减少cpu占用率 mousePostion.Text = e.Location.ToString(); if (tools.startDraw) { switch (sType) { case "Dot": tools.DrawDot(e); break; case "Eraser": tools.Eraser(e); break; case "Word": tools.DrawWord(e); break; default: tools.Draw(e, sType); break; } } }