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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>大鱼吃小鱼</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
overflow: hidden;
}
canvas {
background: url(img/bg.jpg)no-repeat center;
background-size: cover;
}
</style>
</head>
<body>
<canvas id="can"></canvas>
<script>
var obj = document.getElementById("can"),
hb = obj.getContext("2d"),
h = obj.height = window.innerHeight,
w = obj.width = window.innerWidth,
my = {
img: [
createImage('img/me.png'),
createImage('img/me_1.png')
],
x: 0,
y: 0,
sw: 50,
sh: 25,
endx:0,
endy:0,
lift:0
},
arr = [],
maxD = 15,//定义 最大15条鱼
Dsmall = [
'img/small_1.png',
'img/small_2.png',
'img/small_3.png',
'img/small_4.png',
'img/small_5.png',
'img/z_1.png',
'img/z_2.png',
'img/z_3.png',
'img/z_4.png',
'img/z_5.png',
'img/big_1.png',
'img/big_2.png',
'img/big_3.png',
]
//设置随机数
function random(max,min){
return Math.random(max - min) + min;
}
//构造函数，创建所有敌人的鱼
function creatfoot(){
}
creatfoot.prototype = {
int:function(){//敌人鱼的初始化参数
var num = Math.floor(Math.random()*Dsmall.length);
switch(num){
case 0://小虾米
this.src = createImage(Dsmall[0]);
this.w = 20;
this.h = 10;
this.sd = 1;
this.lift = 11;
break;
case 1://小鱼一级
this.src = createImage(Dsmall[1]);
this.w = 24;
this.h = 12;
this.sd = 1.2;
this.lift = 10;
break;
case 2://小鱼二级
this.src = createImage(Dsmall[2]);
this.w = 28;
this.h = 14;
this.sd = 1.3;
this.lift = 10;
break;
case 3://小鱼三级
this.src = createImage(Dsmall[3]);
this.w = 30;
this.h = 16;
this.sd = 1.35;
this.lift = 4;
break;
case 4://小鱼四级
this.src = createImage(Dsmall[4]);
this.w = 34;
this.h = 17;
this.sd = 0.9;
this.lift = 5;
break;
case 5://中鱼一级
this.src = createImage(Dsmall[5]);
this.w = 40;
this.h = 22;
this.sd = 0.65;
this.lift = 10;
break;
case 6://中鱼二级
this.src = createImage(Dsmall[6]);
this.w = 46;
this.h = 25;
this.sd = 0.82;
this.lift = 12;
break;
case 7://中鱼三级
this.src = createImage(Dsmall[7]);
this.w = 55;
this.h = 29;
this.sd = 1.5;
this.lift = 16;
break;
case 8://中鱼四级
this.src = createImage(Dsmall[8]);
this.w = 62;
this.h = 33;
this.sd = 1.22;
this.lift = 18;
break;
case 9://中鱼五级
this.src = createImage(Dsmall[9]);
this.w = 70;
this.h = 40;
this.sd = 0.85;
this.lift = 20;
break;
case 10://大鱼一级
this.src = createImage(Dsmall[10]);
this.w = 120;
this.h = 70;
this.sd = 1.44;
this.lift = 25;
break;
case 11://大鱼二级
this.src = createImage(Dsmall[11]);
this.w = 200;
this.h = 100;
this.sd = 0.8;
this.lift = 50;
break;
case 12://大鱼三级
this.src = createImage(Dsmall[12]);
this.w = 230;
this.h = 160;
this.sd = 1.3;
this.lift = 100;
break;
}
this.x = getFx('x',-this.w);
this.y = getFx('y');
this.sdx = this.x <= this.w ? Math.random() * (this.sd - 0.5) + 0.5 : Math.random() * -(this.sd - 0.5) - 0.5;
this.sdy = this.y < h / 2 - 100 ? Math.random() * (this.sd - 0.5) : Math.random() * -(this.sd - 0.5);
},
draw:function(){
this.x += this.sdx;
this.y += this.sdy;
if(this.x >= my.x && this.x + this.w <= my.x + my.sw && this.y >= my.y && this.y + this.h <= my.y + my.sh){
my.lift += this.lift;
this.int();
}
this.pengzhuang();
hb.drawImage(this.src, this.x, this.y, this.w, this.h);
},
pengzhuang:function(){
if(this.x > w || this.x < -this.w){
this.int();
}
}
}
function Dyd(){
for(x in arr){
arr[x].draw();
}
}
//刚出来的敌人鱼的坐标
function getFx(a,b){
if(a == 'x'){
var arr1 = [b,w];
return arr1[Math.floor(Math.random()*2)];
}else{
return Math.random()*h;
}
}
//创建图片对象的方法
function createImage(src) {
var o = new Image();
o.src = src;
return o;
}
//自己鱼的方法
function chi(){
if(my.lift >= 10 && my.lift < 50){
my.sw = 70;
my.sh = 35;
}else if(my.lift >= 50 && my.lift < 100){
my.sw = 100;
my.sh = 50;
}else if(my.lift >= 100 && my.lift < 200){
my.sw = 120;
my.sh = 60;
}else if(my.lift >= 200 && my.lift < 300){
my.sw = 150;
my.sh = 75;
}else if(my.lift >= 300 && my.lift < 400){
my.sw = 200;
my.sh = 100;
}else if(my.lift >= 400 && my.lift < 500){
my.sw = 250;
my.sh = 125;
}
}
//自己鱼移动的方法
document.addEventListener('mousemove',function(e){
my.endx = e.clientX;
my.endy = e.clientY;
},false)
//每个敌人鱼对象的方法
window.onload = function(){
for(var i=0; i<maxD; i++){
(function(j){
setTimeout(function(){
var o = new creatfoot();
o.int();
arr.push(o);
},500 * j)
})(i)
}
//console.log(arr)
}
var timer = setInterval(function(){
hb.clearRect(0,0,w,h);
my.x += (my.endx - my.x)/100;
my.y += (my.endy - my.y)/100;
my.x = Math.min(my.x , w - my.sw);//不超出屏幕宽度
my.y = Math.min(my.y , h - my.sh);//不超出屏幕高度
Dyd()
chi()
if(my.endx - my.x > 0){
hb.drawImage(my.img[1], my.x, my.y, my.sw, my.sh);//向右走
}else{
hb.drawImage(my.img[0], my.x, my.y, my.sw, my.sh);//向左走
}
// if((my.x + my.sw) > w){//不超出屏幕宽度
// my.x = w - my.sw;
// }
// if((my.y + my.sh) > h){//不超出屏幕高度
// my.y = h - my.sh;
// }
},20)
</script>
</body>
</html>