截屏小程序--c#

写程序中，有时需要利用截屏操作时，而调用QQ或者系统的PrintScreen不方便传值时，需要在程序中做截屏功能，本程序实现这一功能。
效果图：

具体源码：

 private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (!isDoubleClick)
            {
                begin = true;
                firstPoint = new Point(e.X, e.Y);
                changePoint(e.X, e.Y);
                msg.Visible = true;
            }
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (begin)
            {
                //获取新的右下角坐标
                secondPoint = new Point(e.X, e.Y);
                int minX = Math.Min(firstPoint.X, secondPoint.X);
                int minY = Math.Min(firstPoint.Y, secondPoint.Y);
                int maxX = Math.Max(firstPoint.X, secondPoint.X);
                int maxY = Math.Max(firstPoint.Y, secondPoint.Y);

                //重新画背景图
                Image tempimage = new Bitmap(cachImage);
                Graphics g = Graphics.FromImage(tempimage);
                //画裁剪框
                g.DrawRectangle(new Pen(Color.Red), minX, minY, maxX - minX, maxY - minY);
                pictureBox1.Image = tempimage;
               
            }
        }

        /*动态调整显示信息的位置,输入参数为当前截屏鼠标位置*/
        public void changePoint(int x, int y)
        {
            if (x < halfWidth)
            {
                if (y < halfHeight)
                { msg.Top = halfHeight; msg.Left = halfWidth; }
                else
                { msg.Top = 0; msg.Left = halfWidth; }
            }
            else
            {
                if (y < halfHeight)
                { msg.Top = halfHeight; msg.Left = 0; }
                else
                { msg.Top = 0; msg.Left = 0; }
            }
            msg.Visible = false;
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            begin = false;
            isDoubleClick = true; //之后再点击就是双击事件了
        }

        private void copytoFather(Rectangle r)
        {
            Image img = new Bitmap(r.Width, r.Height);
            Graphics g = Graphics.FromImage(img);
            g.CopyFromScreen(new Point(r.Left,r.Top), new Point(0,0), r.Size);

            Clipboard.SetImage(img);
        }

        private void pictureBox1_DoubleClick(object sender, EventArgs e)
        {
            if (firstPoint != secondPoint)
            {
                int minX = Math.Min(firstPoint.X, secondPoint.X);
                int minY = Math.Min(firstPoint.Y, secondPoint.Y);
                int maxX = Math.Max(firstPoint.X, secondPoint.X);
                int maxY = Math.Max(firstPoint.Y, secondPoint.Y);
                Rectangle r = new Rectangle(minX, minY, maxX - minX, maxY - minY);
                copytoFather(r);
            }
            this.Close();
            
        }

在此基础上，需要再进行过程的调用，则可以灵活实现截屏的功能。
具体资源：源码下载