winform GDI基础（三）实现画笔

目录

• 在程序窗口上使用鼠标画图

 

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在程序窗口上使用鼠标画图

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private Point pStart, pEnd;       private bool isAllowDraw = false;       private bool isOpenPen = false;       private void Form1_MouseDown(object sender, MouseEventArgs e)       {           if (isOpenPen)           {               isAllowDraw = true;               pStart = pEnd = e.Location;           }       }         private void Form1_MouseUp(object sender, MouseEventArgs e)       {           if (isOpenPen)           {               isAllowDraw = false;           }       }         private void Form1_MouseMove(object sender, MouseEventArgs e)       {           if (isOpenPen && isAllowDraw)           {               pEnd = e.Location;                 Graphics g = this.CreateGraphics();               g.SmoothingMode = SmoothingMode.HighQuality;//去掉锯齿               System.Drawing.Pen pen = new System.Drawing.Pen(Color.Red, 4);               g.DrawLine(pen, pStart, pEnd);                 pStart = pEnd;           }       }