/**
 * 静态变量
 */

var SCREEN_WIDTH = 512; //屏幕宽
var SCREEN_HEIGHT = 448;//屏幕高


/**************图片资源*****************/
var MENU_IMAGE = new Image();
MENU_IMAGE.src = "images/menu.gif";
var RESOURCE_IMAGE = new Image();
RESOURCE_IMAGE.src = "images/tankAll.gif";


/**************各个图块在图片中的位置*****************/
var POS = new Array();
POS["selectTank"] = [128,96];
POS["stageLevel"] = [396,96];
POS["num"] = [256,96];
POS["map"] = [0,96];
POS["home"] = [256,0];
POS["score"] = [0,112];
POS["player"] = [0,0];
POS["protected"] = [160,96];
POS["enemyBefore"] = [256,32];
POS["enemy1"] = [0,32];
POS["enemy2"] = [128,32];
POS["enemy3"] = [0,64];
POS["bullet"] = [80,96];
POS["tankBomb"] = [0,160];
POS["bulletBomb"] = [320,0];
POS["over"] = [384,64];
POS["prop"] = [256,110];

/**************声音资源*****************/
var START_AUDIO = new Audio("audio/start.mp3");
var BULLET_DESTROY_AUDIO = new Audio("audio/bulletCrack.mp3");
var TANK_DESTROY_AUDIO = new Audio("audio/tankCrack.mp3");
var PLAYER_DESTROY_AUDIO = new Audio("audio/playerCrack.mp3");
var MOVE_AUDIO = new Audio("audio/move.mp3");
var ATTACK_AUDIO = new Audio("audio/attack.mp3");
var PROP_AUDIO = new Audio("audio/prop.mp3");


/**************游戏状态*****************/
var GAME_STATE_MENU = 0;
var GAME_STATE_INIT = 1;
var GAME_STATE_START = 2;
var GAME_STATE_OVER = 3;
var GAME_STATE_WIN = 4;

/**************地图块*****************/
var WALL = 1;
var GRID = 2;
var GRASS = 3;
var WATER = 4;
var ICE = 5;
var HOME = 9;
var ANOTHREHOME = 8;

/**************坦克及子弹的四个方向*****************/
var UP = 0;
var DOWN = 1;
var LEFT = 2;
var RIGHT = 3;

/**************坦克及子弹的四个方向*****************/
var ENEMY_LOCATION = [192,0,384]; //相对与主游戏区

/**************子弹类型*****************/
var BULLET_TYPE_PLAYER = 1;
var BULLET_TYPE_ENEMY = 2;
/**************爆炸类型****************/
var CRACK_TYPE_TANK = "tank";
var CRACK_TYPE_BULLET = "bullet";