c#放大镜

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;



namespace Magnifier

{

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.Button button1;

private System.Windows.Forms.OpenFileDialog openFileDialog1;

private System.ComponentModel.Container components = null;

private Image img = null;

private System.Windows.Forms.Panel panel1;

private System.Windows.Forms.Panel panel2;

private System.Windows.Forms.PictureBox pictureBox2;

private System.Windows.Forms.PictureBox pictureBox1;

private System.Windows.Forms.Label label1;

private int scale = 1;



public Form1()

{

InitializeComponent();

}



protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null) 

{

components.Dispose();

}

}

base.Dispose( disposing );

}



#region Windows 窗体设计器生成的代码

private void InitializeComponent()

{

this.button1 = new System.Windows.Forms.Button();

this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();

this.panel1 = new System.Windows.Forms.Panel();

this.panel2 = new System.Windows.Forms.Panel();

this.pictureBox2 = new System.Windows.Forms.PictureBox();

this.pictureBox1 = new System.Windows.Forms.PictureBox();

this.label1 = new System.Windows.Forms.Label();

this.panel1.SuspendLayout();

this.panel2.SuspendLayout();

this.SuspendLayout();

// 

// button1

// 

this.button1.Location = new System.Drawing.Point(416, 520);

this.button1.Name = "button1";

this.button1.Size = new System.Drawing.Size(96, 23);

this.button1.TabIndex = 1;

this.button1.Text = "浏览 >>";

this.button1.Click += new System.EventHandler(this.button1_Click);

// 

// panel1

// 

this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;

this.panel1.Controls.Add(this.panel2);

this.panel1.Controls.Add(this.pictureBox1);

this.panel1.Location = new System.Drawing.Point(8, 8);

this.panel1.Name = "panel1";

this.panel1.Size = new System.Drawing.Size(504, 504);

this.panel1.TabIndex = 0;

// 

// panel2

// 

this.panel2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;

this.panel2.Controls.Add(this.pictureBox2);

this.panel2.Enabled = false;

this.panel2.Location = new System.Drawing.Point(50, 50);

this.panel2.Name = "panel2";

this.panel2.Size = new System.Drawing.Size(80, 80);

this.panel2.TabIndex = 1;

// 

// pictureBox2

// 

this.pictureBox2.Location = new System.Drawing.Point(0, 0);

this.pictureBox2.Name = "pictureBox2";

this.pictureBox2.Size = new System.Drawing.Size(80, 80);

this.pictureBox2.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;

this.pictureBox2.TabIndex = 0;

this.pictureBox2.TabStop = false;

// 

// pictureBox1

// 

this.pictureBox1.Cursor = System.Windows.Forms.Cursors.Cross;

this.pictureBox1.Location = new System.Drawing.Point(0, 0);

this.pictureBox1.Name = "pictureBox1";

this.pictureBox1.Size = new System.Drawing.Size(500, 500);

this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;

this.pictureBox1.TabIndex = 0;

this.pictureBox1.TabStop = false;

this.pictureBox1.Click += new System.EventHandler(this.pictureBox1_Click);

this.pictureBox1.DoubleClick += new System.EventHandler(this.pictureBox1_DoubleClick);

this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove);

// 

// label1

// 

this.label1.ForeColor = System.Drawing.Color.Blue;

this.label1.Location = new System.Drawing.Point(8, 520);

this.label1.Name = "label1";

this.label1.Size = new System.Drawing.Size(296, 24);

this.label1.TabIndex = 2;

this.label1.Text = "说明：鼠标单击可放大图片，双击可还原初始大小。";

this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;

// 

// Form1

// 

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.Size(522, 551);

this.Controls.Add(this.label1);

this.Controls.Add(this.button1);

this.Controls.Add(this.panel1);

this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;

this.MaximizeBox = false;

this.Name = "Form1";

this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

this.Text = "图片放大镜 - 测试版 http://www.hbhmao.cn";

this.panel1.ResumeLayout(false);

this.panel2.ResumeLayout(false);

this.ResumeLayout(false);



}

#endregion



[STAThread]

static void Main() 

{

Application.Run(new Form1());

}



private void button1_Click(object sender, System.EventArgs e)

{

openFileDialog1.InitialDirectory = Application.StartupPath;

openFileDialog1.Filter = "图片文件|*.jpg;*.bmp;*.gif;*.jpeg;*.png";

if (openFileDialog1.ShowDialog() != System.Windows.Forms.DialogResult.OK)

{

return;

}

pictureBox1.Width = pictureBox1.Height = 500;

try

{

img = Image.FromFile(openFileDialog1.FileName);

if (img.Width < img.Height)

{

pictureBox1.Width = (int)((1.0 * img.Width / img.Height) * pictureBox1.Height);

}

else

{

pictureBox1.Height = (int)((1.0 * img.Height / img.Width) * pictureBox1.Width);

}

pictureBox1.Image = img;

pictureBox2.Width = img.Width * scale;

pictureBox2.Height = img.Height * scale;

pictureBox2.Image = img;

}

catch (OutOfMemoryException ee)

{

MessageBox.Show("文件类型不对"+ee);

}

catch (Exception ee)

{

MessageBox.Show("不知名错误"+ee);

}

}



private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)

{

if (img != null)

{

int left = (int)(e.X * (1.0 * img.Width/pictureBox1.Width)*scale);

int top = (int)(e.Y * (1.0 * img.Height/pictureBox1.Height)*scale);



left -= panel2.Width/2;

top -= panel2.Height/2;



pictureBox2.Left = -left;

pictureBox2.Top = -top;



pictureBox1.Refresh();

}

panel2.Top = e.Y - panel2.Height / 2;

panel2.Left = e.X - panel2.Width / 2;

}



private void pictureBox1_Click(object sender, System.EventArgs e)

{

if (img == null || scale > 10)

{

return;

}

scale++;

panel2.Width += 10;

panel2.Height += 10;

pictureBox2.Width = img.Width * scale;

pictureBox2.Height = img.Height * scale;

}



private void pictureBox1_DoubleClick(object sender, System.EventArgs e)

{

if (img == null)

{

return;

}

scale = 1;

panel2.Width = 80;

panel2.Height = 80;

pictureBox2.Width = img.Width * scale;

pictureBox2.Height = img.Height * scale;

}



}

}