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import?javax.imageio.*;

import?javax.swing.*;

import?java.awt.*;

import?java.awt.event.*;

import?java.awt.geom.*;

import?java.io.*;

import?java.util.*;

/**

*?@author?Hardneedl

*/

final?class?PicDemo?extends?JFrame?{

public?String?getTitle()?{return?"PicDemo";}

static?private?final?Dimension?size?=?new?Dimension(600,400);

public?Dimension?getPreferredSize()?{return?size;}

public?Dimension?getMaximumSize()?{return?size;}

public?Dimension?getMinimumSize()?{return?size;}

public?Dimension?getSize(){return?size;}

private?interface?Brush?extends?Observer{

void?paint(Graphics?g);

}

private?class?Canvas?extends?JComponent{

private?Brush?b;

private?Observable?observable=new?Observable(){

public?void?notifyObservers(Object?arg)?{

setChanged();

super.notifyObservers(arg);

}

};

void?setBrush(Brush?b){

this.b=b;

observable.deleteObservers();

observable.addObserver(b);

if(isVisible())repaint();

}

private?Canvas()?{

addMouseListener(new?MouseAdapter(){

public?void?mouseClicked(MouseEvent?e)?{

observable.notifyObservers(e.getPoint());

repaint();

}

});

}

protected?void?paintComponent(Graphics?g)?{

super.paintComponent(g);

if(b!32313133353236313431303231363533e78988e69d8331333332623931=null)b.paint(g);

}

}

private?class?ImageBrush?implements?Brush{

private?boolean?drawTilEnabled;

private?Image?mainImg,til;

private?Point?p=new?Point();

private?void?setTil(Image?til)?{this.til?=?til;}

private?void?setMainImg(Image?mainImg)?{this.mainImg?=?mainImg;}

public?void?paint(Graphics?g)?{

Graphics2D?g2=?(Graphics2D)?g.create();

g2.drawImage(mainImg,0,0,null);

if(drawTilEnabled)

g2.drawImage(til,?AffineTransform.getTranslateInstance(p.x-(til.getWidth(null)>>1),?p.y-(til.getHeight(null)>>1)),null);

g2.dispose();

}

public?void?update(Observable?o,?Object?arg)?{

if(arg?instanceof?Point){

drawTilEnabled=true;

p.setLocation((Point)?arg);

}

}

}

private?Canvas?canvas;

PicDemo()?throws?HeadlessException?{

init();

attachListeners();

doLay();

}

private?void?init(){

canvas=new?Canvas();

ImageBrush?brush=new?ImageBrush();

try?{

brush.setMainImg(ImageIO.read(new?File("b.png")));

brush.setTil(ImageIO.read(new?File("unknown.png")));

}?catch?(IOException?e)?{

e.printStackTrace();

}

canvas.setBrush(brush);

}

private?void?attachListeners(){

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private?void?doLay(){

final?Container?container?=?getContentPane();

container.add(canvas,BorderLayout.CENTER);

pack();

setVisible(true);

}

public?static?void?main(String...args)?{

System.setProperty("swing.defaultlaf","com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

SwingUtilities.invokeLater(

new?Runnable(){

public?void?run()?{

new?PicDemo();

}

}

);

}

}

總結

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