2 u010090347 u010090347 于 2013.10.27 21:04 提问

求大神帮忙,关于java.awt.Graphics中的g.copyArea()

import java.awt.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;

/**

  • @version 1.33 2007-04-14
  • @author Cay Horstmann */ public class ImageTest { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { ImageFrame frame = new ImageFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); } }

/**

  • A frame with an image component
    */
    class ImageFrame extends JFrame
    {
    public ImageFrame()
    {
    setTitle("ImageTest");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    // add component to frame

    ImageComponent component = new ImageComponent();
    add(component);
    }

    public static final int DEFAULT_WIDTH = 300;
    public static final int DEFAULT_HEIGHT = 200;
    }

/**

  • A component that displays a tiled image
    */
    class ImageComponent extends JComponent
    {
    public ImageComponent()
    {
    // acquire the image
    try
    {
    image = ImageIO.read(new File("blue-ball.gif"));
    }
    catch (IOException e)
    {
    e.printStackTrace();
    }
    }

    public void paintComponent(Graphics g)
    {
    if (image == null) return;

    int imageWidth = image.getWidth(this);
    int imageHeight = image.getHeight(this);

    // draw the image in the upper-left corner

    g.drawImage(image, 0, 0, null);
    // tile the image 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);
    }

    private Image image;
    }

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