ufocanvas.java

该项目适合于J2ME的游戏开发初学者

package src;

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import java.util.*;
import java.io.*;

public class UFOCanvas extends GameCanvas implements Runnable {

    private Display display;
    private boolean sleeping;
    private long frameDelay;
    private Random rand;
    private Sprite ufoSprite;
    private int ufoXSpeed,  ufoYSpeed;
    private Sprite[] roidSprite = new Sprite[5];//绮剧伒鏁扮粍
    private long gametime;
    private long gametimeoffset;
    /**娓告垙鏆傚仠鍙橀噺*/
    public boolean isPaused = false;
    String pauseStr = "鏆傚仠";
    String continueStr = "缁х画";
    /**娓告垙缁撴潫鍙橀噺*/
    boolean gameOver = false;
    int width;
    int height;

    public UFOCanvas(Display d) {
        super(false);
        width = getWidth();
        height = getHeight();
        display = d;
        gametime = 0;

        // Set the frame rate (30 fps)
        frameDelay = 33;
    }

    public void start() {
        // Set the canvas as the current screen
        display.setCurrent(this);

        // Initialize the random number generator
        rand = new Random();
        this.gametimeoffset = System.currentTimeMillis();

        // Initialize the UFO and roids sprites
        ufoXSpeed = ufoYSpeed = 0;
        try {
            ufoSprite = new Sprite(Image.createImage("/Saucer.png"));
            ufoSprite.setPosition((getWidth() - ufoSprite.getWidth()) / 2,
                    (getHeight() - ufoSprite.getHeight()) / 2);//鍒濆