/*
游戏引擎
*/
var Engine = {
//刚开始的游戏状态
gameStatus:false,
//所以敌机
enemy:{},
//子弹
bullet:{},
//得分
scroe:0,
//背景图片
game:document.querySelector('.game'),
//页面得分
textScroe:document.querySelector('.score'), //初始化
init:function(){
this.gameStart();
},
//游戏开始
gameStart:function(){
var _this = this;
//点击图片的时候判断游戏状态
this.game.onclick = function(){
if(!_this.gameStatus){
_this.gameStatus = true;
//移动移动
_this.bgMove();
_this.handleMove();
_this.createPlane();
}
}
},
//背景移动
bgMove:function(){
var y=0;
var _this = this;
this.bgTimer = setInterval(function(){
y+=2;
_this.game.style['background-position-y']=y+'px';
},50)
},
createPlane:function(){
//创建敌机和英雄机
Hero.init(); //创建敌机
this.createTimer = setInterval(function(){
var num = parseInt(Math.random()*15)+1;
switch (num) {
case 1:
case 3:
case 5:
case 7:
case 9:
new SmallEnemy().init();
break;
case 2:
case 4:
case 6:
new MiddleEnemy().init();
case 8:
case 12:
new LargeEnemy().init(); }
},500)
},
//所有敌机和子弹都要动
handleMove:function(){
var _this=this;
this.moveTimer = setInterval(function(){
//创建所有子弹
for(var i in _this.bullet){
_this.bullet[i].move()
}
//c创建所有敌机动
for(var i in _this.enemy){
_this.enemy[i].move()
} },30)
},
//碰撞检测
isCompact:function(obj1,obj2){
var l1 = obj1.offsetLeft>obj2.offsetLeft+obj2.offsetWidth;
var l2 = obj2.offsetLeft>obj1.offsetLeft+obj1.offsetWidth;
var t1 = obj1.offsetTop>obj2.offsetTop+obj2.offsetHeight;
var t2 = obj2.offsetTop>obj1.offsetTop+obj1.offsetHeight;
if(l1||l2||t1||t2){
return false;
}else{
return true;
}
},
//更新得分
updateScroe:function(scroe){ this.scroe+=scroe; this.textScroe.innerHTML="分数"+this.scroe;
},
gameOver:function(){
//停止创建敌机
clearInterval(this.createTimer); //子弹停止
clearInterval(this.moveTimer);
}
};
Engine.init();
子弹停止
/*
英雄机：因为英雄机只有一辆所以不需要用构造函数
*/
var Hero = {
//初始图片
self:null,
//初始left
left:0,
//初始top
top:0,
//生命值
life:3,
//加载进来的图和爆照的图
imgs:['image/hero.gif','image/hero-bang.gif'],
//获得到自己的红星
allHero:document.querySelectorAll('.life>img'),
//初始化
init:function(){
//创建一个元素
var img = document.createElement('img');
//将图片路径赋值给它
img.src=this.imgs[0];
//插入到game中
Engine.game.appendChild(img);
//赋值给英雄机的初始图片
this.self = img;
//当图片加载完成以后获取图片的高度和宽度
var _this = this;//在函数里面this的指向会改变，所以我们提前报存下来
img.onload = function(){
//因为上面的属性有this.left所以我们应该和图片一样赋值给它
_this.left = (Engine.game.offsetWidth-img.offsetWidth)/2;//英雄机的left中心点等于（game的宽度-英雄机的宽度）除以2
_this.top = Engine.game.offsetHeight-img.offsetHeight;
img.style.left = _this.left+'px';
img.style.top = _this.top+'px';
//初始化的时候调用move
_this.move();
_this.shoot();
}; },
//鼠标移动的时候英雄机也要移动
move:function(){
//类似于放大镜
var _this = this;
document.onmousemove = function(e){
var e = e||event;
var l = e.clientX - Engine.game.offsetLeft - _this.self.offsetWidth/2;
var t = e.clientY - Engine.game.offsetTop - _this.self.offsetHeight/2;
//边界处理
var lmax = Engine.game.offsetWidth-_this.self.offsetWidth;//最大边界 var bmax = Engine.game.offsetHeight-_this.self.offsetHeight;//最大边界
l = l < 0 ? 0 : (l > lmax ? lmax : l);
t = t < 0 ? 0 : (t > bmax ? bmax : t); //赋值
_this.self.style.left = l+'px';
_this.self.style.top = t+'px'; //更新left top
_this.left = l;
_this.top = t;
}
},
//发子弹
shoot:function(){
//每隔100毫秒发一次子弹
var _this = this;
this.shootTimer = setInterval(function(){
var l = _this.left+_this.self.offsetWidth/2
new Bullet(l,_this.top).init();
},100)
},
bang:function(){
var img = document.createElement('img');
img.src = this.imgs[1];
img.style.left = this.left+'px';
img.style.top = this.top+'px';
Engine.game.appendChild(img)
setTimeout(function(){
img.remove();
},1000)
},
die:function(){
this.life--;
this.allHero = document.querySelectorAll('.life img');
this.allHero[0].remove(); console.log(this.allHeart,this.allHero[0])
if(this.life<=0){
this.destroy();
}
},
destroy:function(){
this.self.remove();
this.bang();
clearInterval(this.shootTimer);
//游戏结束
this.gameOver();
}
}
//在游戏没开始的时候不能出现英雄机和子弹所以要放在引擎里面
//Hero.init();