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   源码介绍

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace Image
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Drawing.Bitmap MyBitmap;
		private string MyFileName="";
		private System.Windows.Forms.PictureBox pictureBox1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		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
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
			this.button1 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(8, 168);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(72, 23);
			this.button1.TabIndex = 1;
			this.button1.Text = "浏览图像";
			this.button1.Click  = new System.EventHandler(this.button1_Click);
			// 
			// openFileDialog1
			// 
			this.openFileDialog1.Filter = "Image files (JPeg, Gif, Bmp, etc.)|*.jpg;*.jpeg;*.gif;*.bmp;*.tif; *.tiff; *.png|"  
				" JPeg files (*.jpg;*.jpeg)|*.jpg;*.jpeg |GIF files (*.gif)|*.gif |BMP files (*.b"  
				"mp)|*.bmp|Tiff files (*.tif;*.tiff)|*.tif;*.tiff|Png files (*.png)| *.png |All f"  
				"iles (*.*)|*.*";
			// 
			// pictureBox1
			// 
			this.pictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
			this.pictureBox1.Image = ((System.Drawing.Image)(resources.GetObject("pictureBox1.Image")));
			this.pictureBox1.Location = new System.Drawing.Point(8, 8);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(296, 152);
			this.pictureBox1.TabIndex = 3;
			this.pictureBox1.TabStop = false;
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(80, 168);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(112, 23);
			this.button2.TabIndex = 4;
			this.button2.Text = "马赛克显示图像";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(192, 168);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(112, 23);
			this.button3.TabIndex = 5;
			this.button3.Text = "马赛克退隐图像";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(224)), ((System.Byte)(224)), ((System.Byte)(224)));
			this.ClientSize = new System.Drawing.Size(312, 198);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.pictureBox1);
			this.Controls.Add(this.button1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示图像马赛克显示";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void button1_Click(object sender, System.EventArgs e)
		{//浏览图像文件
			this.openFileDialog1.ShowDialog();
			if(this.openFileDialog1.FileName.Trim()=="")
				return;
			try
			{   //得到原始大小的图像
				MyFileName=this.openFileDialog1.FileName;
				Bitmap SrcBitmap=new Bitmap(MyFileName);
				//得到缩放后的图像
				MyBitmap=new Bitmap(SrcBitmap,this.pictureBox1.Width,
					this.pictureBox1.Height);
				this.pictureBox1.Image=MyBitmap;
			}
			catch(Exception Err)
			{
				MessageBox.Show(this,"打开图像文件错误！","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}

		private void button2_Click(object sender, System.EventArgs e)
		{//以马赛克方式显示图像
			if(this.MyFileName.Length<2)
			{
				MessageBox.Show("请首先单击“浏览图像”按钮选择图像","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}
  		    int dw=MyBitmap.Width/50;
			int dh=MyBitmap.Height/50;
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); 		
			Point []MyPoint=new Point[2500];
			for(int x=0;x<50;x  )
				for(int y=0;y<50;y  )
				{
					MyPoint[x*50 y].X=x*dw;
					MyPoint[x*50 y].Y=y*dh;
				}
			Bitmap bitmap=new Bitmap(MyBitmap.Width,MyBitmap.Height);
			for(int i=0;i<10000;i  )
			{
				System.Random   MyRandom=new Random();					
				int iPos=MyRandom.Next(2500);	
				for(int m=0;m<dw;m  )
					for(int n=0;n<dh;n  )
					{
						bitmap.SetPixel(MyPoint[iPos].X m,MyPoint[iPos].Y n,MyBitmap.GetPixel(MyPoint[iPos].X m,MyPoint[iPos].Y n));
					}
				this.pictureBox1.Refresh();
				this.pictureBox1.Image=bitmap;			
			}
			for(int i=0;i<2500;i  )
				for(int m=0;m<dw;m  )
					for(int n=0;n<dh;n  )
					{
						bitmap.SetPixel(MyPoint[i].X m,MyPoint[i].Y n,MyBitmap.GetPixel(MyPoint[i].X m,MyPoint[i].Y n));
					}
			this.pictureBox1.Refresh();
			this.pictureBox1.Image=bitmap;								
		}

		private void button3_Click(object sender, System.EventArgs e)
		{//以马赛克方式退隐图像
			if(this.MyFileName.Length<2)
			{
				MessageBox.Show("请首先单击“浏览图像”按钮选择图像","信息提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
				return;
			}  		    
			MyBitmap=(Bitmap)this.pictureBox1.Image.Clone();
			int dw=MyBitmap.Width/50;
			int dh=MyBitmap.Height/50;
			Graphics g=this.pictureBox1.CreateGraphics();
			Point []MyPoint=new Point[2500];
			for(int x=0;x<50;x  )
				for(int y=0;y<50;y  )
				{
					MyPoint[x*50 y].X=x*dw;
					MyPoint[x*50 y].Y=y*dh;
				}
			Bitmap bitmap=new Bitmap(MyBitmap.Width,MyBitmap.Height);
			for(int i=0;i<2500;i  )
				for(int m=0;m<dw;m  )
					for(int n=0;n<dh;n  )
					{
						bitmap.SetPixel(MyPoint[i].X m,MyPoint[i].Y n,MyBitmap.GetPixel(MyPoint[i].X m,MyPoint[i].Y n));
					}
			this.pictureBox1.Refresh();
			this.pictureBox1.Image=bitmap;		
			bitmap=(Bitmap)this.pictureBox1.Image.Clone();
		
			for(int i=0;i<10000;i  )
			{
				System.Random   MyRandom=new Random();					
				int iPos=MyRandom.Next(2500);	
				for(int m=0;m<dw;m  )
					for(int n=0;n<dh;n  )
					{
						bitmap.SetPixel(MyPoint[iPos].X m,MyPoint[iPos].Y n,this.pictureBox1.BackColor);
					}
				this.pictureBox1.Refresh();
				this.pictureBox1.Image=bitmap;			
			}
			for(int i=0;i<2500;i  )
				for(int m=0;m<dw;m  )
					for(int n=0;n<dh;n  )
					{
						bitmap.SetPixel(MyPoint[i].X m,MyPoint[i].Y n,this.pictureBox1.BackColor);
					}

			g.Clear(this.pictureBox1.BackColor); 							
		}
	}
}