#region 定义全局变量
        //定义全局变量width，用来存放当前活动窗体的width
        static int width = 0;
        static int height = 0;
        static int count = 0;

        //分别声明四条虚线的起点与终点
        static Point p1 = new Point(0, 10);
        static Point p2;

        static Point p3;
        static Point p4;

        static Point p5 = new Point(10, 0);
        static Point p6;

        static Point p7;
        static Point p8;

        //是否选中
        static bool isClick = false;

        //设置字体颜色
        Font font = new Font("宋体", 8);
        #endregion

        public Frm_Report()
        {
            InitializeComponent();
        }

        private void Frm_Report_Load(object sender, EventArgs e)
        {
            //避免闪烁，使用辅助缓冲区
            this.DoubleBuffered = true;

            //设置窗体最大化
            this.WindowState = FormWindowState.Maximized;

            //实例化一个用户选择的打印机
            PrintDialog _Dialog = new PrintDialog();
            width = _Dialog.PrinterSettings.DefaultPageSettings.PaperSize.Width;       //827
            height = _Dialog.PrinterSettings.DefaultPageSettings.PaperSize.Height;     //1169

            p2 = new Point(width, 10);

            p3 = new Point(0, height - 100);
            p4 = new Point(width, height - 100);

            p6 = new Point(10, height);

            p7 = new Point(width - 10, 0);
            p8 = new Point(width - 10, height);

        }

        /// <summary>
        /// 鼠标左键按下
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Frm_Report_MouseDown(object sender, MouseEventArgs e)
        {
            //判断用户按下时，鼠标所在的区域在不在四条虚线上
            if ((e.X - p1.X >= 0) && (e.X - p2.X <= 0))
            {
                if (e.Y <= p1.Y + 5 && e.Y >= p1.Y - 5)
                {
                    isClick = true;
                    count = 1;
                    Cursor.Current = Cursors.SizeNS;
                }

                if (e.Y <= p3.Y + 5 && e.Y >= p3.Y - 5)
                {
                    isClick = true;
                    count = 2;
                    Cursor.Current = Cursors.SizeNS;
                }
            }
            if ((e.Y - p5.Y >= 0) && (e.Y - p6.Y <= 0))
            {
                if (e.X <= p5.X + 5 && e.X >= p5.X - 5)
                {
                    isClick = true;
                    count = 3;
                    Cursor.Current = Cursors.SizeWE;
                }
                if (e.X <= p7.X + 5 && e.X >= p7.X - 5)
                {
                    isClick = true;
                    count = 4;
                    Cursor.Current = Cursors.SizeWE;
                }
            }
        }

        /// <summary>
        /// 鼠标左键按下且在按下的状态下拖动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Frm_Report_MouseMove(object sender, MouseEventArgs e)
        {
            this.Invalidate();
        }

        /// <summary>
        /// 鼠标左键松开
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Frm_Report_MouseUp(object sender, MouseEventArgs e)
        {

            if (isClick)
            {
                //判断选中的是那条直线
                if (count == 1)
                {
                    if (e.Y >= 10 && e.Y <= height / 2 - 40)
                    {
                        p1.Y = e.Y;
                        p2.Y = e.Y;
                    }
                    else if (e.Y < 10)