C# 用鼠标绘制蚂蚁线--------------------在线等

Question

        bool tuodong = false;        //建立一个委托
        delegate void LINEDDAPROC(int X, int Y, IntPtr lpData);
        //调用adi32.dll
        [DllImport("gdi32.dll")]
        static extern int LineDDA(int nXStart, int nYStart, int nXEnd, int nYEnd,
        LINEDDAPROC lpLineFunc, IntPtr lpData);        private const byte PT_CLOSEFIGURE = 1;
        private const byte PT_LINETO = 2;
        private const byte PT_BEZIERTO = 4;
        private const byte PT_MOVETO = 6;        [DllImport("gdi32.dll")]
        static extern int SetPixel(IntPtr hdc, int X, int Y, int crColor);        //实例化一个相互连接直线类
        GraphicsPath graphicsPath = new GraphicsPath();
        private int counter = 0;
        private IntPtr graphicsHandle = IntPtr.Zero;        private void button1_Click(object sender, EventArgs e)
        {
            //清除此路径上的所有标记
            graphicsPath.ClearMarkers();
            //在此路径上绘出一个矩形
            graphicsPath.AddRectangle(new Rectangle(10, 10, 100, 100));
            //设定时间间隔为100
            timer1.Interval = 100;
            //引发 enabled 事件
            timer1.Enabled = true;
        }        private void MovingDots(int X, int Y, IntPtr lpData)
        {
            counter = (counter + 1) % 15;
            Color vColor;
            if (counter < 6)
            {
                vColor = Color.Black;
            }
            else if (counter < 12)
            {
                vColor = Color.White;
            }
            else
            {
                vColor = Color.White;
            }
            SetPixel(graphicsHandle, X, Y, vColor.R | vColor.G << 8 | vColor.B << 16);
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            graphicsHandle = Graphics.FromHwnd(Handle).GetHdc();
            for (int i = 0; i < graphicsPath.PathPoints.Length; i++)
            {
                if (graphicsPath.PathTypes[i] == (byte)(PT_CLOSEFIGURE | PT_LINETO))
                {
                    for (int j = i; j >= 0; j--)
                    {
                        if (graphicsPath.PathTypes[j] == PT_MOVETO)
                        {
                            LineDDA(
                                (int)graphicsPath.PathPoints[i].X,
                                (int)graphicsPath.PathPoints[i].Y,
                                (int)graphicsPath.PathPoints[j].X,
                                (int)graphicsPath.PathPoints[j].Y,
                                MovingDots, IntPtr.Zero);
                            break;
                        }
                    }
                    continue;
                }
                if (i == graphicsPath.PathPoints.Length - 1)
                {
                    LineDDA(
                        (int)graphicsPath.PathPoints[i].X,
                        (int)graphicsPath.PathPoints[i].Y,
                        (int)graphicsPath.PathPoints[0].X,
                        (int)graphicsPath.PathPoints[0].Y,
                        MovingDots, IntPtr.Zero);
                }
                else
                {
                    LineDDA(
                        (int)graphicsPath.PathPoints[i].X,
                        (int)graphicsPath.PathPoints[i].Y,
                        (int)graphicsPath.PathPoints[i + 1].X,
                        (int)graphicsPath.PathPoints[i + 1].Y,
                        MovingDots, IntPtr.Zero);
                }
            }
        }                //鼠标按下
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            tuodong = true;            
        }        //鼠标拖动
        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (tuodong)
            {
                //清除此路径上的所有标记
                graphicsPath.ClearMarkers();
                //在此路径上绘出一个矩形
                graphicsPath.AddRectangle(new Rectangle(50,50,e.X - 50,e.Y - 50));
                //设定时间间隔为100
                timer1.Interval = 100;
                //引发 enabled 事件
                timer1.Enabled = true;                
            }           }        //鼠标释放
        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            tuodong = false;
        }

Answer 1

没分了 求高手指点一二如何把蚂蚁线绘制在 pictureBox上面蚂蚁线的绘制路径  如何消除谢谢了

Answer 2

写好了，你可以参照一下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        Point startPoint = new Point();
        Point endPoint = new Point();
        bool shouldDraw = false;
        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {        }        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            if (!shouldDraw)
                return;
            Pen pen = new Pen(Color.Black);
            pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;            Point[] points = new Point[5];
            points[0] = startPoint;
            points[1] = new Point(endPoint.X, startPoint.Y);
            points[2] = endPoint;
            points[3] = new Point(startPoint.X, endPoint.Y);
            points[4] = startPoint;
            e.Graphics.DrawLines(pen, points);
            this.Invalidate();        }        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            startPoint = e.Location;
            endPoint = e.Location;
            shouldDraw = true;
        }        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            endPoint = e.Location;
            
            this.Invalidate();
        }        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            shouldDraw = false;
        }
    }
}

Answer 3

打开FORM的DOUBLEBUFFERED可以消除闪烁

Answer 4

lz是C++出身的阿C#中用GDI+来进行绘画十分方便的