C# 局部放大图片实例 附完整源码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Linq;using System.Windows.Forms;using System.Drawing.Drawing2D;using System.Drawing.Imaging;namespace ImageBlowUp{ public partial class Frm_Main : Form { Cursor myCursor = new Cursor(@"C:\WINDOWS\Cursors\cross_r.cur"); //自定义鼠标 Image myImage; public Frm_Main() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //设置文件的类型 openFileDialog1.Filter = "*.jpg,*.jpeg,*.bmp,*.gif,*.ico,*.png,*.tif,*.wmf|*.jpg;*.jpeg;*.bmp;*.gif;*.ico;*.png;*.tif;*.wmf"; openFileDialog1.ShowDialog();//打开文件对话框 myImage = System.Drawing.Image.FromFile(openFileDialog1.FileName);//根据文件的路径和名称实例化Image类 pictureBox1.Image = myImage;//显示图片 pictureBox1.Height = myImage.Height;//设置控件的高度 pictureBox1.Width = myImage.Width;//设置控件的宽度 } private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { try { Cursor.Current = myCursor;//定义鼠标 Graphics graphics = pictureBox1.CreateGraphics();//实例化pictureBox1控件的Graphics类 //声明两个Rectangle对象，分别用来指定要放大的区域和放大后的区域 Rectangle sourceRectangle = new Rectangle(e.X - 10, e.Y - 10, 20, 20);//要放大的区域 Rectangle destRectangle = new Rectangle(e.X - 20, e.Y - 20, 40, 40); //调用DrawImage方法对选定区域进行重新绘制，以放大该部分 graphics.DrawImage(myImage, destRectangle, sourceRectangle, GraphicsUnit.Pixel); } catch { } } }}