c# 图片放大缩小鼠标点击放大区域为原始大小

c# 图片放大缩小（鼠标点击放大区域为原始大小）

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.Drawing.Imaging;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private Bitmap m_Image;
        private Point m_StarPoint = Point.Empty;
        private Point m_ViewPoint = Point.Empty;
        private string Img = “../../1.jpg“;
        private int Img_Width Img_Height;//宽 高
        private bool _isLeftMouseDown = false;


        public Form1（）
        {
            InitializeComponent（）;
        }

        private void Form1_Load（object sender EventArgs e）
        {
            System.Drawing.Image image = System.Drawing.Image.FromFile（@Img）; 
            Img_Width = image.Width;//宽
            Img_Height = image.Height;//高

            m_Image = （Bitmap）Image.FromFile（@Img）;
            this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
            pictureBox1.Image = m_Image.Clone（new RectangleF（0 0 Img_Width Img_Height） PixelFormat.Format24bppRgb）;
            this.pictureBox1.MouseDown += this.pictureBox1_MouseDown;
        }

        public float StrToFloat（object FloatString）//string转float
        {
            float result;
            if （FloatString != null）
            {
                if （float.TryParse（FloatString.ToString（） out result））
                    return result;
                else
                {
                    return （float）0.00;
                }
            }
            else
            {
                return （float）0.00;
            }
        }


        private void pictureBox1_MouseDown（object sender MouseEventArgs e）
        {
            m_StarPoint = e.Location;
            decimal C_pictureBox1Width = Math.Round（（decimal）pictureBox1.Width / 2 0）; //图片框X中心点
            decimal C_pictureBox1Height = Math.Round（（decimal）pictureBox1.Height / 2 0）; //图片框Y中心点
            decimal C_ImgWidth = Math.Round（（decimal）Img_Width / 2 0）; //图片X中心点
            decimal C_ImgHeight = Math.Round（（decimal）Img_Height / 2 0）; //图片Y中心点
            decimal C_WidthB = Math.Round（（decimal）Img_Width / pictureBox1.Width 4）; //图片与框X比
            decimal C_HeightB = Math.Round（（decimal）Img_Height / pictureBox1.Height 4）; //图片与框Y比
            decimal C_Width = Math.Round（（decimal）C_WidthB * m_StarPoint.X 0）; //图片鼠标获取X点
            decimal C_Height = Math.Round（（decimal）C_HeightB * m_StarPoint.Y 0）; //图片鼠标获取Y点

            float Tmp_Width = StrToFloat（（C_Width - C_pictureBox1Width）.ToString（））;
            float Tmp_Height = StrToFloat（（C_Height - C_pictureBox1Height）.ToString（））;

            if （Tmp_Width < 1） Tmp_Width = 0;
            else if （Tmp_Width > （Img_Width - pictureBox1.Width）） Tmp_Width = Img_Width - pictureBox1.Width;
            if （Tmp_Height < 1） Tmp_Height = 0;
            else if （Tm

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        914  2012-11-22 16:46  图片放大缩小.sln

    ..A..H.     24064  2012-11-22 20:35  图片放大缩小.suo

     文件     260429  2012-09-13 14:28  WindowsFormsApplication1\1.jpg

     文件      12800  2012-11-22 20:34  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe

     文件      28160  2012-11-22 20:34  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb

     文件      11600  2012-11-22 20:35  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe

     文件        490  2010-03-17 22:39  WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.vshost.exe.manifest

     文件       4958  2012-11-22 20:34  WindowsFormsApplication1\Form1.cs

     文件       8558  2012-11-22 19:06  WindowsFormsApplication1\Form1.Designer.cs

     文件       5817  2012-11-22 19:06  WindowsFormsApplication1\Form1.resx

     文件       6484  2012-11-22 20:34  WindowsFormsApplication1\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件        316  2012-11-22 19:06  WindowsFormsApplication1\obj\x86\Debug\GenerateResource.read.1.tlog

     文件        798  2012-11-22 19:06  WindowsFormsApplication1\obj\x86\Debug\GenerateResource.write.1.tlog

     文件       1348  2012-11-22 20:35  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.csproj.FileListAbsolute.txt

     文件      12800  2012-11-22 20:34  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.exe

     文件        180  2012-11-22 19:06  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Form1.resources

     文件      28160  2012-11-22 20:34  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.pdb

     文件        180  2012-11-22 16:46  WindowsFormsApplication1\obj\x86\Debug\WindowsFormsApplication1.Properties.Resources.resources

     文件        505  2012-11-22 16:46  WindowsFormsApplication1\Program.cs

     文件       1380  2012-11-22 16:46  WindowsFormsApplication1\Properties\AssemblyInfo.cs

     文件       2896  2012-11-22 16:46  WindowsFormsApplication1\Properties\Resources.Designer.cs

     文件       5612  2012-11-22 16:46  WindowsFormsApplication1\Properties\Resources.resx

     文件       1107  2012-11-22 16:46  WindowsFormsApplication1\Properties\Settings.Designer.cs

     文件        249  2012-11-22 16:46  WindowsFormsApplication1\Properties\Settings.settings

     文件       3707  2012-11-22 16:46  WindowsFormsApplication1\WindowsFormsApplication1.csproj

     目录          0  2012-11-22 16:46  WindowsFormsApplication1\obj\x86\Debug\TempPE

     目录          0  2012-11-22 20:34  WindowsFormsApplication1\obj\x86\Debug

     目录          0  2012-11-22 16:46  WindowsFormsApplication1\bin\Debug

     目录          0  2012-11-22 16:46  WindowsFormsApplication1\obj\x86

     目录          0  2012-11-22 16:46  WindowsFormsApplication1\bin

............此处省略6个文件信息