【C#】winform 图片局部放大类似淘宝

来源：互联网发布：东北林业大学知乎编辑：程序博客网时间：2024/04/29 17:03

整体效果：

有两个picturebox控件，name默认没有修改。其中picturebox1的img赋予初始值，picturebox2的visible=false；其余不变，程序比较简单，看以参考下。

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;using System.Windows.Forms;namespace 局部放大{    public partial class Form1 : Form    {        Thread thDraw;        delegate void myDrawRectangel();        myDrawRectangel mydraw;        private Point ptBegin = new Point();        private bool blIsDrawRectangle = false;        public Form1()        {            InitializeComponent();        }        private void pictureBox1_Paint(object sender, PaintEventArgs e)        {            //画矩形 初始值为false否则 一开始就会显示矩形框            if (blIsDrawRectangle)            {                e.Graphics.DrawRectangle(new Pen(Brushes.Black, 1), ptBegin.X, ptBegin.Y, 50, 50);            }        }        private void Form1_Load(object sender, EventArgs e)        {            mydraw = new myDrawRectangel(ShowDrawRectangle);            thDraw = new Thread(Run);            thDraw.Start();        }        private void Run()        {            while (true)            {                if (pictureBox1.Image != null)                {                    this.BeginInvoke(mydraw);                }                Thread.Sleep(50);            }        }        private void Form1_FormClosed(object sender, FormClosedEventArgs e)        {            if (thDraw != null)            {                thDraw.Abort();            }                   }        private void ShowDrawRectangle()        {            Rectangle rec = new Rectangle(ptBegin.X * pictureBox1.Image.Size.Width / 460, ptBegin.Y * pictureBox1.Image.Size.Height / 350,                                           50 * pictureBox1.Image.Size.Width / 460, 50 * pictureBox1.Image.Size.Height / 350);            Graphics g = pictureBox2.CreateGraphics();            g.DrawImage(pictureBox1.Image, pictureBox2.ClientRectangle, rec, GraphicsUnit.Pixel);            g.Flush();        }        private void pictureBox1_MouseLeave(object sender, EventArgs e)        {            pictureBox2.Visible = false;            blIsDrawRectangle = false;            pictureBox1.Refresh();        }        private void pictureBox1_MouseEnter(object sender, EventArgs e)        {            pictureBox2.Visible = true;            blIsDrawRectangle = true;        }        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)        {            if (e.X - 25 <= 0)            {                ptBegin.X = 0;            }            else if (pictureBox1.Size.Width - e.X <= 25)            {                ptBegin.X = pictureBox1.Size.Width - 50;            }            else            {                ptBegin.X = e.X - 25;            }            if (e.Y - 25 <= 0)            {                ptBegin.Y = 0;            }            else if (pictureBox1.Size.Height - e.Y <= 25)            {                ptBegin.Y = pictureBox1.Size.Height - 50;            }            else            {                ptBegin.Y = e.Y - 25;            }            pictureBox1.Refresh();        }    }}

源码：

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