imagetestappletwithdynamicupdate.java

来自「awt图形界面的生成」· Java 代码 · 共 30 行

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;

public class ImageTestAppletWithDynamicUpdate extends Applet {
 	private Image im;

	public void init() {
		im = getImage(getCodeBase(), "saint.gif");

		System.out.print  ("Image width=" + im.getWidth(this));
		System.out.println(" height=" + im.getHeight(this));
	}
	public void paint(Graphics g) {
	  g.drawImage(im,0,0,this);
	}
	public boolean imageUpdate(Image image, int flags, 
							   int x, int y, int w, int h)
	{
 		System.out.println("imageUpdate():  x=" + x + ", y=" + 
		                    y + "  w=" + w + ",h=" + h);
		repaint();

		if((flags & ALLBITS) == 0)  
			return true;			// need more updates 
		else  
			return false;			// image is fully loaded
	}
}