图像的局部放大

1、图像的局部放大基于winform下的pictBox控件和button控件实现的：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;using System.IO;using System.Threading;namespace 图像的局部放大 public partial class Form1

2、: Form public Form1() InitializeComponent(); Cursor mycur = new Cursor(C:windowscursorscross_l.cur); Bitmap image; private void button1_Click(object sender, EventArgs e) OpenFileDialog ofd = new OpenFileDialog(); ofd.Filter = Jpeg File(*.jpg)|*.jpg; if (ofd.ShowDialog()=DialogResult.OK) image = new

3、Bitmap(ofd.FileName); pictureBox1.Image = image; pictureBox1.Width = image.Width; pictureBox1.Height = image.Height; Private void pictureBox1_MouseMove(object sender, MouseEventArgs e) if (image != null) Cursor.Current = mycur; Graphics g = pictureBox1.CreateGraphics(); this.pictureBox1.Refresh();/清

4、楚原来的内容重绘pictureBox的图像 Rectangle soureRec = new Rectangle(e.X-100 , e.Y-100 , 200, 200); /100代表图片放大的区域的尺寸和位置,其中e.x-100，e.y-100代表光标处于需要放大图像区域的中间位置 Rectangle destRec = new Rectangle(e.X-200 , e.Y-200 , 400, 400);/200代表图片放大后的区域的尺寸和位置，其中e.x-200，e.y-200代表光标处于需要放大图像区域的中间位置 g.DrawImage(image, destRec, soure

5、Rec, GraphicsUnit.Pixel); /在指定位置按照指定大小绘制Image图像，则该图像放大了（200/100）倍 else MessageBox.Show(选择需要显示的图片); 另一种参考程序：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 图像的局部放大

6、01 public partial class Form1 : Form public static int i = 0; private Point m_ptStart = new Point(0, 0); private Point m_ptEnd = new Point(0, 0); private bool m_bMouseDown = false; private float xRate, yRate, realX1, realY1, realX2, realY2; int pLeft = 0; int pTop = 0; public Form1() InitializeCompo

7、nent(); private void Form1_Load(object sender, EventArgs e) xRate = (float)pictureBox1.Image.Width / pictureBox1.Width; yRate = (float)pictureBox1.Image.Height / pictureBox1.Height; SetStyle(ControlStyles.UserPaint, true); SetStyle(ControlStyles.AllPaintingInWmPaint, true); / 禁止擦除背景. SetStyle(Contro

8、lStyles.DoubleBuffer, true); /双缓冲 private void pictureBox1_MouseDown(object sender, MouseEventArgs e) if (pictureBox1.HasChildren) for (int i = 0; i pictureBox1.Controls.Count; i+) pictureBox1.Controls.RemoveAt(0); if (e.Button != MouseButtons.Left) return; m_ptEnd = new Point(e.X, e.Y); this.pictur

9、eBox1.Refresh(); realX1 = e.X * xRate; realY1 = e.Y * yRate; if (!m_bMouseDown) m_ptStart = new Point(e.X, e.Y); m_ptEnd = new Point(e.X, e.Y); m_bMouseDown = !m_bMouseDown; private void pictureBox1_Paint(object sender, PaintEventArgs e) if (m_ptEnd.X - m_ptStart.X 0 | m_ptEnd.Y - m_ptStart.Y = 100)

10、 m_ptEnd.X = m_ptStart.X + 100; if (m_ptEnd.Y - m_ptStart.Y = 100) m_ptEnd.Y = m_ptStart.Y + 100; e.Graphics.DrawRectangle(System.Drawing.Pens.Blue, m_ptStart.X, m_ptStart.Y, m_ptEnd.X - m_ptStart.X, m_ptEnd.Y - m_ptStart.Y); private void pictureBox1_MouseUp(object sender, MouseEventArgs e) int eX =

11、 0, eY = 0; if (e.Button != MouseButtons.Left) return; if (e.X - m_ptStart.X = 100) if (e.X = pictureBox1.Width - 1) if (pictureBox1.Width - m_ptStart.X - 1 100) eX = m_ptStart.X + 100; else eX = pictureBox1.Width - 1; else eX = m_ptStart.X + 100; else if (e.X = pictureBox1.Width - 1) eX = pictureBo

12、x1.Width - 1; else eX = e.X; if (e.Y - m_ptStart.Y = 100) if (e.Y = pictureBox1.Height - 1) if (pictureBox1.Height - m_ptStart.Y - 1 100) eX = m_ptStart.Y + 100; else eY = pictureBox1.Height - 1; else eY = m_ptStart.Y + 100; else if (e.Y = pictureBox1.Height - 1) eY = pictureBox1.Height - 1; else eY

13、 = e.Y; if (m_ptStart.X = 0 & m_ptEnd.X = 0 & m_ptStart.Y = 0 & m_ptEnd.Y = 0 & m_ptStart.X = 254 & m_ptEnd.X = 254 & m_ptStart.Y = 163 & m_ptEnd.Y pLeft = e1.X; pTop = e1.Y; ; p.MouseMove += (s2, e2) = GC.Collect(); if (e2.Button.ToString().Equals(Left) if (p.Location.X + e2.X - pLeft = pictureBox1

14、.Width - p.Width) p.Left = pictureBox1.Width - p.Width - 1; else p.Left = p.Location.X + e2.X - pLeft; if (p.Location.Y + e2.Y - pTop = pictureBox1.Height - p.Height) p.Top = pictureBox1.Height - p.Height - 1; else p.Top = p.Location.Y + e2.Y - pTop; Crop(Bitmap)pictureBox1.Image, Convert.ToInt32(p.

15、Location.X * xRate), Convert.ToInt32(p.Location.Y * yRate), Convert.ToInt32(p.Width), Convert.ToInt32(p.Height); ; pictureBox1.Controls.Add(p); private void pictureBox1_MouseMove(object sender, MouseEventArgs e) if (e.Button != MouseButtons.Left) return; m_ptEnd = new Point(e.X, e.Y); this.pictureBox1.Refresh(); private void Crop(Bitmap bitmap, int X, int Y, int width, int height) if (width 0 & height 0) Re