对图像进行水平镜像和垂直镜像!

//Mirror.java/* 程序说明：对图像进行水平镜像和垂直镜像!  最后修改时间：2003-12  作者：haibin */ import java.awt.*;import java.awt.event.*;import java.awt.image.*;import javax.swing.*; public class Mirror extends Frame { Image im,tmp; int iw,ih; int[] pixels; boolean flagLoad=false;  public Mirror(){  this.setTitle("图像的水平和垂直镜像");  Panel pdown;  Button load,horizon,vertical,quit;    //添加窗口监听事件  addWindowListener(new WindowAdapter(){   public void windowClosing(WindowEvent e){    System.exit(0);   }  });    pdown = new Panel();  pdown.setBackground(Color.lightGray);    load=new Button("加载图像");  horizon=new Button("水平镜像");  vertical= new Button("垂直镜像");  quit=new Button("退出");    this.add(pdown,BorderLayout.SOUTH);    pdown.add(load);  pdown.add(horizon);  pdown.add(vertical);  pdown.add(quit);    load.addActionListener(new ActionListener(){   public void actionPerformed(ActionEvent e){    jLoad_ActionPerformed(e);   }  });    horizon.addActionListener(new ActionListener(){   public void actionPerformed(ActionEvent e){    jHorizon_ActionPerformed(e);   }  });    vertical.addActionListener(new ActionListener(){  public void actionPerformed(ActionEvent e){    jVertical_ActionPerformed(e);   }  });    quit.addActionListener(new ActionListener(){  public void actionPerformed(ActionEvent e){    jQuit_ActionPerformed(e);   }  }); }  public void jLoad_ActionPerformed(ActionEvent e){  //利用MediaTracker跟踪图像的加载  MediaTracker tracker = new MediaTracker(this);  im=Toolkit.getDefaultToolkit().getImage("Miss.jpg");  tracker.addImage(im,0);   //等待图像的完全加载  try{  tracker.waitForID(0);   }catch(InterruptedException e2){ e2.printStackTrace();}     //获取图像的宽度iw和高度ih  iw=im.getWidth(this);  ih=im.getHeight(this);  pixels=new int[iw*ih];    try{  PixelGrabber pg=new PixelGrabber(im,0,0,iw,ih,pixels,0,iw);  pg.grabPixels();  }catch (InterruptedException e3) {   e3.printStackTrace();  }   //将数组中的象素产生一个图像  ImageProducer ip=new MemoryImageSource(iw,ih,pixels,0,iw);  tmp=createImage(ip);  flagLoad=true;  repaint(); }  public  void jHorizon_ActionPerformed(ActionEvent e){  if(flagLoad){  //可以进行连续的镜像!  /*  try{  PixelGrabber pg=new PixelGrabber(im,0,0,iw,ih,pixels,0,iw);  pg.grabPixels();  }catch (InterruptedException e3) {   e3.printStackTrace();  }  */      //对图像进行水平镜像，Alpha值保持不变  int [] tempPixels=new int[iw*ih];  for(int i=0;i<iw*ih;i++)  {   tempPixels[i]=pixels[i];  }    for(int i=0;i<ih;i++)  {   for(int j=0;j<iw;j++)   {    //核心算法:第一列变为最后一列    pixels[i*iw+j]=tempPixels[i*iw+(iw-j-1)];   }  }    //将数组中的象素产生一个图像  ImageProducer ip=new MemoryImageSource(iw,ih,pixels,0,iw);  tmp=createImage(ip);  repaint();  }else{   JOptionPane.showMessageDialog(null,"请先打开一幅图片!",                         "Alert",JOptionPane.WARNING_MESSAGE);  } }   public void jVertical_ActionPerformed(ActionEvent e){  if(flagLoad){  //可以进行连续的镜像  /*  try{  PixelGrabber pg=new PixelGrabber(im,0,0,iw,ih,pixels,0,iw);  pg.grabPixels();  }catch (InterruptedException e3) {   e3.printStackTrace();  }  */  //对图像进行垂直镜像，Alpha值保持不变  int [] tempPixels=new int[iw*ih];  for(int i=0;i<iw*ih;i++)  {   tempPixels[i]=pixels[i];  }     for(int i=0;i<ih;i++)  {   for(int j=0;j<iw;j++)   {    //核心算法:第一行变为最后一行    pixels[i*iw+j]=tempPixels[(ih-i-1)*iw+j];   }  }    //将数组中的象素产生一个图像  ImageProducer ip=new MemoryImageSource(iw,ih,pixels,0,iw);  tmp=createImage(ip);  repaint();  }else{   JOptionPane.showMessageDialog(null,"请先打开一幅图片!",                         "Alert",JOptionPane.WARNING_MESSAGE);    } }  //程序退出 public void jQuit_ActionPerformed(ActionEvent e){  //System.exit(0);  JOptionPane op =new JOptionPane();  int exit=op.showConfirmDialog(this,"你要退出吗? ? ?","退出",JOptionPane.YES_NO_OPTION);    if(exit==JOptionPane.YES_OPTION)  {   System.exit(0);     }else{ }  }  //调用paint()方法，显示图像信息。 public void paint(Graphics g){  if(flagLoad){   g.drawImage(tmp,10,20,this);  }  else{ } }  //定义main方法，设置窗口的大小，显示窗口 public static void main(String[] args) {  Mirror mirror = new Mirror();  mirror.setLocation(50,50);  mirror.setSize(500,400);  mirror.show(); } }