簡介

java 核心編程

code

/*

* @Author: your name

* @Date: 2020-10-28 22:38:26

* @LastEditTime: 2020-10-28 22:45:52

* @LastEditors: Please set LastEditors

* @Description: In User Settings Edit

* @FilePath: /java/ImageTest.java

*/

import java.awt.*;

import javax.swing.*;

public class ImageTest {

public static void main(String[] args){

EventQueue.invokeLater(()->{

JFrame frame = new ImageFrame();

frame.setTitle("ImageTest");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

});;

}

}

class ImageFrame extends JFrame {

public ImageFrame() {

add(new ImageComponent());

pack();

}

}

class ImageComponent extends JComponent {

private static final int DEFAULT_WIDTH = 300;

private static final int DEFAULT_HEIGHT = 200;

private Image image;

public ImageComponent(){

image = new ImageIcon("test.gif").getImage();

}

public void paintComponent(Graphics g) {

if (image == null)

return;

int imageWidth = image.getWidth(this);

int imageHeight = image.getHeight(this);

// draw the iamge in the upper-left cornet

g.drawImage(image, 0, 0, null);

// tile the iamge across the component

for (int i = 0; i * imageWidth <= getWidth(); i++) {

for (int j = 0; j * imageHeight <= getHeight(); j++) {

if (i + j > 0) {

g.copyArea(0, 0, imageWidth, imageHeight, i * imageWidth, j * imageHeight);

}

}

}

}

public Dimension getPreferredSize() {

return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT);

}

}

image

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