关于picturebox中画点连线的问题

Question

现在需要在picturebox中用鼠标左键点击一系列点，并按顺序连接起来，然后双击鼠标左键按下最后一个点弹出对话框以求得距离

Answer 1

如何响应mousedown,mouseup,doubleclick

Answer 2

private System.Drawing.Drawing2D.GraphicsPath  path=new System.Drawing.Drawing2D.GraphicsPath ();
        private Point org=Point.Empty;
        private double distance = 0;
       
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (org == Point.Empty)
                {
                    org = e.Location;
                }
                else
                {
                    this.distance += this.GetDistance(org, e.Location);
                    path.AddLine(org, e.Location);
                    this.org = e.Location;
                    this.pictureBox1.Invalidate();
                   
               }
            }
        }        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawPath(Pens.Red, this.path);
        }        private double GetDistance(Point pt1, Point pt2)
        {
            int h= pt1.X - pt2.X;
            int v = pt1.Y - pt2.Y;
            return Math.Sqrt(h * h + v * v);
        }        private void pictureBox1_DoubleClick(object sender, EventArgs e)
        {
            MessageBox.Show(this.distance.ToString());
            this.path = new System.Drawing.Drawing2D.GraphicsPath();
            this.org = Point.Empty;
            this.distance = 0;
        }

Answer 3

谢谢jointan() 兄弟，如果再添加一个求面积的按钮呢

Answer 4

如果求面积就复杂了,用算法写,估计5000元不一定有人给你写.
但还是有一个非常低效的求面积方法(而且精度差),就是在另一个BITMAP里面填充这个Path,然后用测点颜色的方式求面积.

Answer 5

哈哈，好的，谢谢你啊，jointan兄