[JAVA100例]028、图片的处理[Java编程]

import javax.swing.*;
import java.awt.*;
/**
* <p>Title: 图片的处理,</p>
* <p>Description: 将图片放大和翻转显示</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: ImgDemo.java</p>
* @version 1.0
*/
class ImgDemo extends JFrame {
Image image;
/**
*<br>办法阐明:构造器,显示窗体
*<br>输入参数:
*<br>返回范例:
*/
ImgDemo(String filename) {
setTitle("drawImage Example");
try {
　image = getToolkit().getImage(filename);
　setIconImage(image);
} catch (Exception e) {
　e.printStackTrace();
}


setSize(600, 250);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
show();
}
/**
*<br>办法阐明:绘制图象
*<br>输入参数:
*<br>返回范例:
*/
public void paint(Graphics g) {
　Insets insets = getInsets();
　int x = insets.left, y = insets.top;
　//获得图片尺寸
　int w = image.getWidth(this);
　int h = image.getHeight(this);
　//正常显示图片
　g.drawImage(image, x, y, this);
　//缩小图形
　g.drawRect(x, y, w/4+1, h/4+1);//画一个框
　g.drawImage(image, x+1, y+1, w/4, h/4, this);
　//水平翻转
　g.drawImage(image, x+w, y, x+2*w, y+h, w, 0, 0, h, this);
}
/**
*<br>办法阐明:主办法,承受参数
*<br>输入参数:
*<br>返回范例:
*/
public static void main(String[] args) {
if (args.length == 1) {
　new ImgDemo(args[0]);
} else {
　System.err.println("usage: java ImgDemo images-name ");
}
}
}