新手求助，弄了个画图的。。发现线是连着的

[Shazam9]

如图，只能画一条线，如何让它们不连着？从而达到画多条线写字的效果。。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace 写字板
{
    public partial class Form1 : Form
    {
        bool drawflag = false;
        bool down = false;
        int X1;
        int Y1;
        List<Point> list;
        public Form1()
        {
            InitializeComponent();
            list = new List<Point>();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            Pen p = new Pen(Color.Red, 4);
            if (list.Count > 2)
            {
                g.DrawLines(p, list.ToArray());
            }
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            drawflag = true;
            down = true;
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (drawflag == false)
                return;
            else if (down == true)
            {
                X1 = e.X;
                Y1 = e.Y;
                list.Add(new Point(e.X, e.Y));
            }
            this.Invalidate();
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            drawflag = false;
        }
    }
}

[xuzuning]

你总是 list.Add(new Point(e.X, e.Y)); 如何能断的开？

[Forty2]

首先，要分成多个折线。 List<Point> list; List<Point[]> lists = new List<Point[]>(); private void Form1_MouseUp(object sender, MouseEventArgs e) { lists.Add(list.ToArray()); list.Clear(); } 其次，画图的时候，逐个画折线。 foreach(var points in lists) { if (...) g.DrawLines(points); } 最后你可能要进行抽样优化，直接追逐鼠标轨迹可能带来太多的点。