类似卫星扫描效果

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核心提示：/*Wireless java 2nd edition Jonathan KnudsenPublisher: APRessISBN: 1590590775 */import javax.microedition.lcdui.*;import javax.microedition.lcdui.game.*;import

/*
Wireless java 2nd edition
Jonathan Knudsen
Publisher: APRess
ISBN: 1590590775
*/

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import javax.microedition.midlet.*;

public class SweepGame extends MIDlet {
public void startApp() {
　 final SweepGameCanvas sweeper = new SweepGameCanvas();
　 sweeper.start();
　
　 sweeper.addCommand(new Command("Exit", Command.EXIT, 0));
　 sweeper.setCommandListener(new CommandListener() {
　　 public void commandAction(Command c, Displayable s) {
　　　 sweeper.stop();
　　　 notifyDestroyed();
　　 }
　 });
　
　 Display.getDisplay(this).setCurrent(sweeper);
}

public void pauseApp() {}

public void destroyApp(boolean unconditional) {}
}

class SweepGameCanvas extends GameCanvas implements Runnable {
private boolean mTrUCking;
private int mTheta;
private int mBorder;
private int mDelay;

public SweepGameCanvas() {
　 super(true);
　 mTheta = 0;
　 mBorder = 10;
　 mDelay = 50;
}

public void start() {
　 mTrucking = true;
　 Thread t = new Thread(this);
　 t.start();
}

public void stop() {
　 mTrucking = false;
}
　
public void render(Graphics g) {
　 int width = getWidth();
　 int height = getHeight();
　
　 // Clear the Canvas.
　 g.setGrayScale(255);
　 g.fillRect(0, 0, width - 1, height - 1);
　
　 int x = mBorder;
　 int y = mBorder;
　 int w = width - mBorder * 2;
　 int h = height - mBorder * 2;
　 for (int i = 0; i < 8; i++) {
　　 g.setGrayScale((8 - i) * 32 - 16);
　　 g.fillArc(x, y, w, h, mTheta + i * 10, 10);
　　 g.fillArc(x, y, w, h, (mTheta + 180) % 360 + i * 10, 10);
　 }
}

public void run() {
　 Graphics g = getGraphics();
　 while (mTrucking) {
　　 mTheta = (mTheta + 1) % 360;
　　 render(g);
　　 flushGraphics();
　　 try { Thread.sleep(mDelay); }
　　 catch (InterruptedException ie) {}
　 }
}
}类似卫星扫描效果