gamelayer.java

一个非常不错的J2ME坦克大战的游戏,可以在机顶盒上实际运行.

package com.ipanel.games.tank;

import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;

import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite;
import javax.microedition.lcdui.game.TiledLayer;

public class GameLayer {

	/**
	 * 0，empty； 1，砖墙； 2，树林； 3，钢墙； 4，水域。
	 */
	public static final int CELL_EMPTY = 0;

	public static final int CELL_BRICK = 1;

	public static final int CELL_GREEN = 2;

	public static final int CELL_IRON = 3;

	public static final int CELL_WATER = 4;

	/**
	 * dataViewLayer是View的数据存储； 程序用View作为Presentation；
	 * 程序不会用dataViewLayer来检测collidesWith()，但是程序行为引起的相关Data以至于View的变化需要被体现出来。
	 */
	private int[][] dataViewLayer = {
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 4, 0, 2, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 4, 0, 2, 0, 0, 0, 0, 0 },
			{ 3, 0, 1, 1, 0, 4, 0, 2, 0, 1, 1, 0, 3 },
			{ 0, 0, 1, 1, 0, 4, 0, 2, 0, 1, 1, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 } };

	/**
	 * dataTankLayer是针对Tank的TiledLayer的数据存储，它构成的TiledLayer将用来检测Tank的collidesWith()；
	 * 另外，程序的行为引起的相关Data的变化需要和dataTankLayer同步。
	 * 
	 * 相对于dataViewLayer，这个数据存储将其中的"2"（即"树林"）置换成为"0"。
	 */
	private int[][] dataTankLayer = {
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0 },
			{ 3, 0, 1, 1, 0, 4, 0, 0, 0, 1, 1, 0, 3 },
			{ 0, 0, 1, 1, 0, 4, 0, 0, 0, 1, 1, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 } };

	/**
	 * dataBulletLayer是针对Bullet的TiledLayer的数据存储，它构成的TiledLayer将用来检测Bullet的collidesWith()；
	 * 另外，程序的行为引起的相关Data的变化需要和dataBulletLayer同步。
	 * 相对于dataViewLayer，这个数据存储将其中的"2"（即"树林"）和"4"（即"水域"）置换成为"0"。
	 * 
	 * 对于Bullets之间以及和Tank的collidesWith()不由这个int[][]存储，而由它们（Sprite）之间处理。
	 */
	private int[][] dataBulletLayer = {
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 3, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 3, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 3 },
			{ 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0 },
			{ 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 },
			{ 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 } };

	/**
	 * 以下三个常数设置可供调整： 存储TiledLayer的int[][]的维，相应的图片的pixel数值。
	 * 
	 * 宽： 46*13＝598； 高： 16*32＝512； 宽： 9*5*13＝9*65＝585； 高： 4*4*32＝4*128＝512；
	 */
	private static final int ARRAY_COLUMN = 13;

	private static final int ARRAY_ROW = 32;

	private static final int IMAGE_WIDTH = 46;

	private static final int IMAGE_HEIGHT = 16;

	public static final int AREA_UP_LEFT_X = 0;

	public static final int AREA_UP_LEFT_Y = 0;

	public static final int AREA_WIDTH = IMAGE_WIDTH * ARRAY_COLUMN;

	public static final int AREA_HEIGHT = IMAGE_HEIGHT * ARRAY_ROW;

	private static final int PLAYER_REMAIN_X_BASE = AREA_WIDTH + 5;

	public static final int SPRITE_DIRCTION_UP = 1;

	public static final int SPRITE_DIRCTION_DOWN = 2;

	public static final int SPRITE_DIRCTION_LEFT = 3;

	public static final int SPRITE_DIRCTION_RIGHT = 4;

	/**
	 * SIZE/STEP的定义应该和Sprite的像素width/height有关： 需要保证不会出现"吃包子馅"的错误。
	 * 
	 * 实际运行中，要求定义的值为（所有collision范畴的最小图片像素size）/2 － 1。
	 */
	public static final int SPRITE_COLLISION_MIN_SIZE = 3;

	private Image imageBoard = null;

	/**
	 * 以下三个TiledLayer分别面向View、Tank、Bullet。
	 */
	private TiledLayer viewLayer = null;

	private TiledLayer tankLayer = null;

	private TiledLayer bulletLayer = null;

	/**
	 * 存储游戏中的Objects。
	 */
	private Vector vPlayerBullets = new Vector();

	private Vector vGameBullets = new Vector();

	private Vector vPlayerTanks = new Vector();

	private Vector vGameTanks = new Vector();

	/**
	 * 存储要求DrawBoom的boomDrawer。
	 */
	private Vector vDrawer = new Vector();

	/**
	 * 为了使Boom图片在flush时候（持续）可见，需要在多次flush的时候paint；这里定义flush的次数。
	 */
	public static final int BOOM_DRAW_TIMES = 3;

	private IPTankGameCanvas canvas = null;

	public GameLayer() {
		super();
	}

	public GameLayer(IPTankGameCanvas canvas) {
		this();
		this.canvas = canvas;
		init();
	}

	private void init() {
		try {
			imageBoard = Image.createImage("/res/Board.png");
		} catch (IOException e) {
			paintException("Exception when createImage in GameLayer()!");
		}

		viewLayer = new TiledLayer(ARRAY_COLUMN, ARRAY_ROW, imageBoard,
				IMAGE_WIDTH, IMAGE_HEIGHT);
		tankLayer = new TiledLayer(ARRAY_COLUMN, ARRAY_ROW, imageBoard,
				IMAGE_WIDTH, IMAGE_HEIGHT);
		bulletLayer = new TiledLayer(ARRAY_COLUMN, ARRAY_ROW, imageBoard,
				IMAGE_WIDTH, IMAGE_HEIGHT);

		initLayer(viewLayer, dataViewLayer);
		initLayer(tankLayer, dataTankLayer);
		initLayer(bulletLayer, dataBulletLayer);
	}

	/**
	 * 将int[][]的数据存储设置为TiledLayer的初始化；这以后，三个TiledLayer就不同了。
	 */