import java.applet.*;
import java.awt.*;
import java.net.*;
//图片火焰效果
//Download by http://www.codefans.net
public class FirePicApplet extends Applet implements Runnable{
private Image backImage,foreImage; //前景和背景Image对象
private Image image,fireImage; //Applet和绘制火焰的效果的Image对象
private Graphics graphics,fireGraphics; //Applet和绘制火焰的效果的Graphics对象
private Thread thread; //火焰效果的线程
private MediaTracker imageTracker; //装载图片
private int height,width; //Applet的高度,宽度
public void init() {
Dimension dim=getSize(); //得到Applet的尺寸
width = dim.width; //得到宽度值
height = dim.height; //得到高度值
backImage = getImage(getDocumentBase(),"back.jpg"); //得到图片
foreImage = getImage(getDocumentBase(),"image1.gif");
imageTracker = new MediaTracker(this); //实例化MediaTracker对象
imageTracker.addImage(backImage,0); //增加图片到图片装载器
imageTracker.addImage(foreImage,0);
try{
imageTracker.waitForID(0); //装载图片
}
catch(InterruptedException e){}
image = createImage(width,height); //得到Image对象实例
graphics = image.getGraphics(); //得到Graphics对象实例
fireImage=createImage(width*2,height*2);
fireGraphics=fireImage.getGraphics();
}
public void start(){
if(thread == null){
thread = new Thread(this); //实例化线程
thread.start(); //运行线程
}
}
public void run(){
int x= 0, y=0; //绘制火焰效果的X坐标,Y坐标
int tileWidth = backImage.getWidth(this); //背景图片的宽度
int tileHeight= backImage.getHeight(this); //背景图片的高度
while(thread != null) {
x=fireImage.getWidth(this)-width; //得到X坐标,Y坐标值
y=fireImage.getHeight(this)-height;
for(;(x>0)&&(y>0); x--,y--) {
if((x==0)||(y==0)) { //坐标回到零时,重新设置
x=fireImage.getWidth(this)-width;
y=fireImage.getHeight(this)-height;
}
for(int j=0; j < fireImage.getHeight(this); j = j + tileHeight){
for(int i=0; i < fireImage.getWidth(this); i = i + tileWidth){
fireGraphics.drawImage(backImage, i, j, this); //绘制背景图片
}
}
fireGraphics.drawImage(foreImage, x, y,width,height,this); //绘制前景图片
graphics.drawImage(fireImage,-x,-y,this); //绘制火焰效果Image
repaint(); //重绘屏幕
}
}
}
public void update(Graphics g){
paint(g);
}
public void paint(Graphics g){
g.drawImage(image,0,0,this); //绘制Image
}
}
