imagetest.java

孙鑫JAVA从入门到精通配套练习程序。所有程序都实际运行过

//动画演示程序
import java.awt.*;
import java.applet.*;
public class ImageTest extends Applet
{
	private Image[] imgs;
	private int totalImage = 10;
	private int currentImage;
	private Image imgBuf;
	private Graphics gBuf;
	private MediaTracker mt = new MediaTracker(this);
	public void init()
	{
		//创建屏幕外图像并获取其图像上下文
		imgBuf = createImage(600, 400);
		gBuf = imgBuf.getGraphics();
		gBuf.setColor(Color.white);
		gBuf.fillRect(0, 0, 600, 400);
		imgs = new Image[totalImage];
		for (int i=0; i<totalImage; i++)
		{
			imgs[i] = getImage(getDocumentBase(), "T" + (i+1) + ".gif");
			mt.addImage(imgs[i], i);
		}
		try
		{
			//确保所有图像都已经加载完成
			mt.waitForAll();
		}
		catch(InterruptedException ex)
		{
			ex.printStackTrace();
		}
	}
	public void start()
	{
		currentImage = 0;
		gBuf.drawImage(imgs[currentImage],0,0,this);
		currentImage = 1;
	}
	public void paint(Graphics g)
	{
		g.drawImage(imgBuf,0,0,this);
		gBuf.fillRect(0, 0, 600, 400);
		gBuf.drawImage(imgs[currentImage], 0, 0, this);
		currentImage = ++currentImage % 10;
		try
		{
			Thread.sleep(500);
		}
		catch(InterruptedException ex)
		{
			ex.printStackTrace();
		}
		repaint();
	}
	public void update(Graphics g)
	{
		paint(g);
	}
}