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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.PictureBox pictureBox1;
		private System.Windows.Forms.Button button1;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.Button button2;
		private System.Windows.Forms.Button button3;
		private System.Windows.Forms.Button button4;
		private System.Windows.Forms.Button button5;
		private System.Windows.Forms.Button button6;
		private System.Windows.Forms.Button button7;
		private System.Windows.Forms.Button button8;
		private System.Drawing.Bitmap MyBitmap;
		/// <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.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.button1 = new System.Windows.Forms.Button();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.button2 = new System.Windows.Forms.Button();
			this.button3 = new System.Windows.Forms.Button();
			this.button4 = new System.Windows.Forms.Button();
			this.button5 = new System.Windows.Forms.Button();
			this.button6 = new System.Windows.Forms.Button();
			this.button7 = new System.Windows.Forms.Button();
			this.button8 = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// 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(280, 192);
			this.pictureBox1.TabIndex = 0;
			this.pictureBox1.TabStop = false;
			// 
			// button1
			// 
			this.button1.Location = new System.Drawing.Point(296, 8);
			this.button1.Name = "button1";
			this.button1.Size = new System.Drawing.Size(96, 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 (*.*)|*.*";
			// 
			// button2
			// 
			this.button2.Location = new System.Drawing.Point(296, 32);
			this.button2.Name = "button2";
			this.button2.Size = new System.Drawing.Size(96, 23);
			this.button2.TabIndex = 2;
			this.button2.Text = "左到右拉伸";
			this.button2.Click  = new System.EventHandler(this.button2_Click);
			// 
			// button3
			// 
			this.button3.Location = new System.Drawing.Point(296, 56);
			this.button3.Name = "button3";
			this.button3.Size = new System.Drawing.Size(96, 23);
			this.button3.TabIndex = 3;
			this.button3.Text = "上到下拉伸";
			this.button3.Click  = new System.EventHandler(this.button3_Click);
			// 
			// button4
			// 
			this.button4.Location = new System.Drawing.Point(296, 80);
			this.button4.Name = "button4";
			this.button4.Size = new System.Drawing.Size(96, 23);
			this.button4.TabIndex = 4;
			this.button4.Text = "四周扩散";
			this.button4.Click  = new System.EventHandler(this.button4_Click);
			// 
			// button5
			// 
			this.button5.Location = new System.Drawing.Point(296, 104);
			this.button5.Name = "button5";
			this.button5.Size = new System.Drawing.Size(96, 23);
			this.button5.TabIndex = 5;
			this.button5.Text = "反转图像";
			this.button5.Click  = new System.EventHandler(this.button5_Click);
			// 
			// button6
			// 
			this.button6.Location = new System.Drawing.Point(296, 128);
			this.button6.Name = "button6";
			this.button6.Size = new System.Drawing.Size(96, 23);
			this.button6.TabIndex = 6;
			this.button6.Text = "两边拉伸";
			this.button6.Click  = new System.EventHandler(this.button6_Click);
			// 
			// button7
			// 
			this.button7.Location = new System.Drawing.Point(296, 152);
			this.button7.Name = "button7";
			this.button7.Size = new System.Drawing.Size(96, 23);
			this.button7.TabIndex = 7;
			this.button7.Text = "上下对接";
			this.button7.Click  = new System.EventHandler(this.button7_Click);
			// 
			// button8
			// 
			this.button8.Location = new System.Drawing.Point(296, 176);
			this.button8.Name = "button8";
			this.button8.Size = new System.Drawing.Size(96, 23);
			this.button8.TabIndex = 8;
			this.button8.Text = "左右对接";
			this.button8.Click  = new System.EventHandler(this.button8_Click);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(400, 206);
			this.Controls.Add(this.button8);
			this.Controls.Add(this.button7);
			this.Controls.Add(this.button6);
			this.Controls.Add(this.button5);
			this.Controls.Add(this.button4);
			this.Controls.Add(this.button3);
			this.Controls.Add(this.button2);
			this.Controls.Add(this.button1);
			this.Controls.Add(this.pictureBox1);
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "演示图像特效显示";
			this.Load  = new System.EventHandler(this.Form1_Load);
			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
				Bitmap SrcBitmap=new Bitmap(this.openFileDialog1.FileName);
				//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)
		{//从左到右拉伸显示
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			for(int x=0;x<=iWidth;x  )
			{
				g.DrawImage(MyBitmap,0,0,x,iHeight);
			}
		}
		private void Form1_Load(object sender, System.EventArgs e)
		{
			MyBitmap=(Bitmap)this.pictureBox1.Image;
		}

		private void button3_Click(object sender, System.EventArgs e)
		{//从上到下拉伸显示
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			for(int y=0;y<=iHeight;y  )			
			{
				g.DrawImage(MyBitmap,0,0,iWidth,y);
			}

		}

		private void button4_Click(object sender, System.EventArgs e)
		{//四周扩散显示
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			for(int x=0;x<=iWidth/2;x  )			
			{
				Rectangle DestRect=new Rectangle(iWidth/2-x,
					iHeight/2-x,2*x,2*x);
				Rectangle SrcRect=new  Rectangle(0,0,
					MyBitmap.Width,MyBitmap.Height);
				g.DrawImage(MyBitmap,DestRect,SrcRect,
					GraphicsUnit.Pixel);
			}

		}

		private void button5_Click(object sender, System.EventArgs e)
		{//反转图像
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			for(int x=-iWidth/2;x<=iWidth/2;x  )		
			{
				Rectangle DestRect=new Rectangle(0,iHeight/2-x,
					iWidth,2*x);
				Rectangle SrcRect=new Rectangle(0,0,MyBitmap.Width,MyBitmap.Height);	
				g.DrawImage(MyBitmap,DestRect,SrcRect,GraphicsUnit.Pixel);
			}
		}

		private void button6_Click(object sender, System.EventArgs e)
		{//两边拉伸显示
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			for(int y=0;y<=iWidth/2;y  )			
			{
				Rectangle DestRect=new Rectangle(iWidth/2-y,0,
					2*y,iHeight);
				Rectangle SrcRect=new Rectangle(0,0,MyBitmap.Width,MyBitmap.Height);
				g.DrawImage(MyBitmap,DestRect,SrcRect,GraphicsUnit.Pixel);
			}
		}

		private void button7_Click(object sender, System.EventArgs e)
		{//上下对接显示
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			Bitmap bitmap=new Bitmap(iWidth,iHeight);
			int x=0;
			while(x<=iHeight/2)
			{
				for(int i=0;i<=iWidth-1;i  )
				{
					bitmap.SetPixel(i,x,
						MyBitmap.GetPixel(i,x));
				}
				for(int i=0;i<=iWidth-1;i  )
				{
					bitmap.SetPixel(i,iHeight-x-1,
						MyBitmap.GetPixel(i,iHeight-x-1));	
				}
				x  ;
				this.pictureBox1.Refresh();
				this.pictureBox1.Image=bitmap;	
			}	

		}

		private void button8_Click(object sender, System.EventArgs e)
		{//左右对接显示
			int iWidth=this.pictureBox1.Width; //图像宽度	
			int iHeight=this.pictureBox1.Height; //图像高度
			//取得Graphics对象
			Graphics g=this.pictureBox1.CreateGraphics();
			g.Clear(Color.Gray); //初始为全灰色
			Bitmap bitmap=new Bitmap(iWidth,iHeight);
			int x=0;
			while(x<=iWidth/2)
			{
				for(int i=0;i<=iHeight-1;i  )
				{
					bitmap.SetPixel(x,i,MyBitmap.GetPixel(x,i));
				}
				for(int i=0;i<=iHeight-1;i  )
				{
					bitmap.SetPixel(iWidth-x-1,i,
						MyBitmap.GetPixel(iWidth-x-1,i));
				}
				x  ;
				this.pictureBox1.Refresh();
				this.pictureBox1.Image=bitmap;
			}

		}

	
	}
}