图片查看器

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.filechooser.FileFilter;//过滤器、有关使用文件扩展名进行过滤的实现
import java.awt.image.*;//图形图像的所有类的超类。必须以特定于平台的方式获取图像。 
import java.awt.geom.AffineTransform;
import java.io.*;//数据流、序列化和文件系统提供系统输入和输出
import java.util.ArrayList;//最大限度地减少实现“随机访问”数据存储（如数组）支持的该接口所需的工作。
import java.awt.image.ConvolveOp;
import java.awt.Point;//坐标
import java.awt.geom.*;


public class ImageViewer extends JFrame
{
 private Image img;
 private JButton b1,b2,b3,b4,b5,b6,b7,b8;
 private JPanel panel;
 Container c;
 DrawPanel dp;
 public boolean start=false;
 public int flag=0;
 String name="c:\\aa.jpg";
 
 
 
 @SuppressWarnings("deprecation")
public ImageViewer()
 {
  super("ImageViewer");
  c=getContentPane();
  panel=new JPanel();
  dp=new DrawPanel(name);
  c.add(dp,BorderLayout.CENTER);
  
  final MouseHandler handler=new MouseHandler(dp);
  dp.addMouseMotionListener(handler);
  dp.addMouseListener(handler);
 
  b1=new JButton("打开");
  panel.add(b1);
  
  b1.addActionListener(new ActionListener()
  {
   public void actionPerformed(ActionEvent e)
   {
    JFileChooser chooser=new JFileChooser();
    chooser.setCurrentDirectory(new File("."));
    final ExtensionFileFilter filter=new ExtensionFileFilter();
    filter.addExtension("jpg");
    filter.addExtension("jpeg");
    filter.addExtension("gif");
    filter.setdescription("Image Files");
    chooser.setFileFilter(filter);
    int result=chooser.showOpenDialog(dp);
    if(result==JFileChooser.APPROVE_OPTION)
    {
     name=chooser.getSelectedFile().getPath();
     getContentPane().remove(dp);
     removeMouseListener(handler);
     dp = new DrawPanel(name);     
     getContentPane().add(dp, BorderLayout.CENTER);
     MouseHandler handler=new MouseHandler(dp);
     dp.addMouseMotionListener(handler);
     dp.addMouseListener(handler);
     dp.revalidate();
     


    }
   
   }
  });
  
  
 


  b2=new JButton("缩放");
  panel.add(b2);
  b2.addActionListener(new Handler2());
 
  
  b3=new JButton("翻转");
  panel.add(b3);
  b3.addActionListener(new Handler3());
  
  
  
  b4=new JButton("移动");
  panel.add(b4);
  b4.addActionListener(new Handler4());
  
  
  b5=new JButton("还原");
  panel.add(b5);
  b5.addActionListener(new Handler5());
  
  b6=new JButton("边缘");
  panel.add(b6);
  b6.addActionListener(new Handler6());
  
  b7=new JButton("画图");
  panel.add(b7);
  b7.addActionListener(new Handler7());
  
  
  b8=new JButton("退出");
  panel.add(b8);
  b8.addActionListener(new ActionListener()
  {
   public void actionPerformed(ActionEvent e)
   {
    System.exit(0);
   }
  });
  
  
  
  c.add(panel,BorderLayout.SOUTH);
  
  
 
  setSize(550,350);
  show();
 }
 
 
 
 
 private class Handler2 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   String str=JOptionPane.showInputDialog(null,"Please input zoom factor","Message",1);
   System.out.println(str);
   if((str==null)||(str.length()==0))
   JOptionPane.showMessageDialog(null,"The data cannot be null","Message",1);
   else
   dp.zoom(Double.parseDouble(str));
   
  }
 }
 
 
 
 private class Handler3 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   String str=JOptionPane.showInputDialog(null,"Please input flip angle","Message",1);
   if((str==null)||(str.length()==0))
   JOptionPane.showMessageDialog(null,"The data cannot be null","Message",1);
   else
   dp.rotate(Integer.parseInt(str));
  }
 }
 
 
 
 
 private class Handler4 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   dp.flag=3;
  }
 }
 
 
 private class Handler5 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   dp.OriginalImage();
  }
 }
 
 
 private class Handler6 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   dp.Edge();
  }
 }
 
 
 private class Handler7 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   dp.flag=5;
  }
 }
private static  class ExtensionFileFilter extends FileFilter
{
 private String description="";
 private ArrayList extensions=new ArrayList();
 public void addExtension(String extension)
 {
  if(!extension.startsWith("."))
  extension="."+extension;
  extensions.add(extension.toLowerCase());
 }
 
 
 public void setdescription(String aDescription)
 {
  description=aDescription;
 }
 
 public String getDescription()
 {
  return description;
 }
 
 public boolean accept(File f)
 {
  if(f.isDirectory())
  return true;
  String name=f.getName().toLowerCase();
  for(int i=0;i<extensions.size();i++)
  if(name.endsWith((String)extensions.get(i)))
  return true;
  return false;
  
 }
}


 


 public static void main(String[] args)
 {
  ImageViewer app=new ImageViewer();
  app.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
 }
 
}


 


  class MouseHandler extends MouseInputAdapter
 {
  
  private Point currentPos,lastPos;
  private DrawPanel drawpanel;
  public  MouseHandler(DrawPanel panel)
  {
   this.drawpanel=panel;
  }
  public void mousePressed(MouseEvent e)
  {
   currentPos=e.getPoint();
   lastPos=e.getPoint();
   drawpanel.drawIt(lastPos,currentPos);
   
  }
  
  
  public void mouseDragged(MouseEvent e)
  {
   
   currentPos=e.getPoint();
   drawpanel.drawIt(lastPos,currentPos);
   lastPos=currentPos;
  
  }
 }
 
class DrawPanel extends JPanel
{
 
 public Image img;
 BufferedImage bi,bi1,bi2,biEdge,bimg,buffer;
 int newX=400,newY=400;
 int flag=0;
 int x, y;
 private Point currentPos,lastPos;
 MouseHandler mousehandler;
 Graphics2D bufferG;
 public DrawPanel(String name)
 {
  img=Toolkit.getDefaultToolkit().getImage(name);
  this.addMouseMotionListener(new MouserMotionHandler());
  MediaTracker mt=new MediaTracker(this);
  mt.addImage(img,1);
  try
  {
   mt.waitForAll();
  }catch(Exception e)
  {
   System.out.println("Exception While Loading.");
  }
  if(img.getWidth(this)==-1)
  {
   System.out.println("***make sure you have the textture image"+"*.jpg file in the same directory.***");
   System.exit(0);
  
  }
  if(img.getWidth(this)!=0 && img.getHeight(this)!=0)
  bi=new BufferedImage(img.getWidth(this),img.getHeight(this),BufferedImage.TYPE_INT_ARGB);
        Graphics2D big=bi.createGraphics();
        big.drawImage(img,0,0,this);
        bi1=bi; 
        bi2=bi;
        biEdge=bi;
 }   
 
 
 
 private class MouserMotionHandler extends MouseMotionAdapter
 {
  public void mouseDragged(MouseEvent e)
  {
   x=e.getX();
   y=e.getY();
   repaint();
   
  }
 }
 
 
 
 
 
 public void zoom(double factor)
 {
  int w=img.getWidth(this);
  int h=img.getHeight(this);
  
   newX=(int)(w*factor);
   newY=(int)(h*factor);
   
   bi1=new BufferedImage(newX,newY,BufferedImage.TYPE_INT_ARGB);
   Graphics2D big=bi1.createGraphics();
   big.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
   big.drawImage(img,0,0,newX,newY,this);
   repaint();
   flag=1;
   
 }
 
 
 public void rotate(int degree)
 {
  int angle=degree%360;
  int w=img.getWidth(this);
  int h=img.getHeight(this);
  if(img.getWidth(this)!=0 && img.getHeight(this)!=0)
  bi2=new BufferedImage(bi.getWidth(this),bi.getHeight(this),BufferedImage.TYPE_INT_ARGB);
  Graphics2D big1=bi2.createGraphics();
  AffineTransform at=new AffineTransform();
  at.translate(w/10,h/10);
  at.rotate(Math.toRadians(angle));
  big1.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  big1.drawImage(img,at,this);
  repaint();
  flag=2;


  
 }
 
 public void OriginalImage()
 {
  flag=0;
  repaint();
 }
 
 
 
 public void drawIt(Point lastPos,Point currentPos)
 {
  this.currentPos=currentPos;
  this.lastPos=lastPos;
  repaint();
 }
 


 
 public void Edge()
 {
  float elements[]={0.0f,-1.0f,0.0f,-1.0f,4.0f,-1.0f,0.0f,-1.0f,0.0f};
  int w=img.getWidth(this);
  int h=img.getHeight(this);
  if(img.getWidth(this)!=0 && img.getHeight(this)!=0)
  biEdge=new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB);
  Graphics2D bigEdge=biEdge.createGraphics();
  bigEdge.drawImage(img,0,0,this);
  BufferedImageOp biop=null;
  AffineTransform at=new AffineTransform();
  if(img.getWidth(this)!=0 && img.getHeight(this)!=0)
  bimg=new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB);
  Kernel kernel=new Kernel(3,3,elements);
  ConvolveOp cop=new ConvolveOp(kernel,ConvolveOp.EDGE_NO_OP,null);
  cop.filter(biEdge,bimg);
  biop=new AffineTransformOp(at,AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
  repaint();
  flag=4;
 }
 
 public void paintComponent(Graphics g)
 {
  
  super.paintComponent(g);
  Graphics2D g2D=(Graphics2D)g;
  if(flag==0)
  g2D.drawImage(bi,0,0,this);
  else if(flag==1)
  g2D.drawImage(bi1,0,0,this);
  else if(flag==2)
  g2D.drawImage(bi2,0,0,this);
  else if(flag==3)
  g2D.drawImage(bi,x,y,this);
  else if(flag==4)
  g2D.drawImage(bimg,0,0,this);
  else if(flag==5)
  {
  if(buffer==null)
  {
    buffer=(BufferedImage)this.createImage(this.getWidth(),this.getHeight());
    bufferG=buffer.createGraphics();
  }
  
  if(currentPos!=null && lastPos!=null)
  bufferG.draw(new Line2D.Double(lastPos,currentPos));
  g2D.drawImage(buffer,0,0,this);
  
  }
 
 }
}