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最新推荐文章于 2024-05-08 17:26:17 发布

转载最新推荐文章于 2024-05-08 17:26:17 发布 · 1.3k 阅读

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本文介绍了一个使用C#实现的手绘跟踪系统，该系统能够捕捉并显示用户在面板上的绘制动作，并支持清除画布及保存为位图文件的功能。

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

namespace HandImage
{
    public partial class frmTest : Form
    {
        List<Points> HandTrack=new List<Points>();
        public Graphics pb_Graphics;
        Bitmap pb_BMP = new Bitmap(239,235);

        int index = 0;    //第几笔
        public frmTest()
        {
            InitializeComponent();
        }

        private void pnlBar_MouseMove(object sender, MouseEventArgs e)
        {
            HandTrack[index].PT.Add(new Point(e.X, e.Y));
            pnlBar.Refresh();
        }

        private void pnlBar_Paint(object sender, PaintEventArgs e)
        {
            pb_Graphics = Graphics.FromImage((System.Drawing.Image)pb_BMP);
            pb_Graphics.Clear(pnlBar.BackColor);
            foreach(Points item in  HandTrack)
            {
                pb_Graphics.DrawLines(new Pen(Color.Black), item.PT.ToArray());
            }
            e.Graphics.DrawImage(pb_BMP, 0, 0);
            pb_Graphics.Dispose();
        }

        class Points
        {
            public List<Point> PT=new List<Point>();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            index = 0;
            HandTrack = new List<Points>();
            pnlBar.Refresh();
        }

        private void pnlBar_MouseUp(object sender, MouseEventArgs e)
        {
            index++;
        }

        private void pnlBar_MouseDown(object sender, MouseEventArgs e)
        {
            HandTrack.Add(new Points());
            HandTrack[index].PT.Add(new Point(e.X, e.Y));
            pnlBar.Refresh();
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            dlgSaveFile.Filter = "位图(*.bmp)|*.bmp";
            if (dlgSaveFile.ShowDialog() == DialogResult.OK)
            {
                string strFile = dlgSaveFile.FileName;
                pb_BMP.Save(strFile, System.Drawing.Imaging.ImageFormat.Bmp);
            }
        }
    }
}