2022跨年烟花代码HTML5夜景放烟花绽放动画效果
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html5夜景放烟花绽放动画效果
html代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
<style>
bodymargin:0;padding:0;overflow: hidden;
.citywidth:100%;position:fixed;bottom: 0px;z-index: 100;
.city imgwidth: 100%;
</style>
<title>html5夜景放烟花绽放动画效果</title>
</head>
<body onselectstart = "return false">
<div style="height:700px;overflow:hidden;">
<canvas id='cas' style="background-color:rgba(0,5,24,1);">浏览器不支持canvas</canvas>
<div class="city"><img src="img/city.png" alt="" /></div>
<img src="img/moon.png" alt="" id="moon" style="visibility: hidden;"/>
<div style="display:none">
<div class="shape">新年快乐</div>
<div class="shape">合家幸福</div>
<div class="shape">万事如意</div>
<div class="shape">心想事成</div>
<div class="shape">财源广进</div>
</div>
</div>
<script>
var canvas = document.getElementById("cas");
var ocas = document.createElement("canvas");
var octx = ocas.getContext("2d");
var ctx = canvas.getContext("2d");
ocas.width = canvas.width = window.innerWidth;
ocas.height = canvas.height = 700;
var bigbooms = [];
window.onload = function()
initAnimate()
function initAnimate()
drawBg();
lastTime = new Date();
animate();
var lastTime;
function animate()
ctx.save();
ctx.fillStyle = "rgba(0,5,24,0.1)";
ctx.fillRect(0,0,canvas.width,canvas.height);
ctx.restore();
var newTime = new Date();
if(newTime-lastTime>500+(window.innerHeight-767)/2)
var random = Math.random()*100>2?true:false;
var x = getRandom(canvas.width/5 , canvas.width*4/5);
var y = getRandom(50 , 200);
if(random)
var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , x:x , y:y);
bigbooms.push(bigboom)
else
var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , x:canvas.width/2 , y:200 , document.querySelectorAll(".shape")[parseInt(getRandom(0, document.querySelectorAll(".shape").length))]);
bigbooms.push(bigboom)
lastTime = newTime;
console.log(bigbooms)
stars.foreach(function()
this.paint();
)
drawMoon();
bigbooms.foreach(function(index)
var that = this;
if(!this.dead)
this._move();
this._drawLight();
else
this.booms.foreach(function(index)
if(!this.dead)
this.moveTo(index);
else if(index === that.booms.length-1)
bigbooms[bigbooms.indexOf(that)] = null;
)
);
raf(animate);
function drawMoon()
var moon = document.getElementById("moon");
var centerX = canvas.width-200 , centerY = 100 , width = 80;
if(moon.complete)
ctx.drawImage(moon , centerX , centerY , width , width )
else
moon.onload = function()
ctx.drawImage(moon ,centerX , centerY , width , width)
var index = 0;
for(var i=0;i<10;i++)
ctx.save();
ctx.beginPath();
ctx.arc(centerX+width/2 , centerY+width/2 , width/2+index , 0 , 2*Math.PI);
ctx.fillStyle="rgba(240,219,120,0.005)";
index+=2;
ctx.fill();
ctx.restore();
Array.prototype.foreach = function(callback)
for(var i=0;i<this.length;i++)
if(this[i]!==null) callback.apply(this[i] , [i])
var raf = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) window.setTimeout(callback, 1000 / 60); ;
canvas.onclick = function()
var x = event.clientX;
var y = event.clientY;
var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , x:x , y:y);
bigbooms.push(bigboom)
// canvas.addEventLisener("touchstart" , function(event)
// var touch = event.targetTouches[0];
// var x = event.pageX;
// var y = event.pageY;
// var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , x:x , y:y);
// bigbooms.push(bigboom)
// )
var Boom = function(x,r,c,boomArea,shape)
this.booms = [];
this.x = x;
this.y = (canvas.height+r);
this.r = r;
this.c = c;
this.shape = shape || false;
this.boomArea = boomArea;
this.theta = 0;
this.dead = false;
this.ba = parseInt(getRandom(80 , 200));
Boom.prototype =
_paint:function()
ctx.save();
ctx.beginPath();
ctx.arc(this.x,this.y,this.r,0,2*Math.PI);
ctx.fillStyle = this.c;
ctx.fill();
ctx.restore();
,
_move:function()
var dx = this.boomArea.x - this.x , dy = this.boomArea.y - this.y;
this.x = this.x+dx*0.01;
this.y = this.y+dy*0.01;
if(Math.abs(dx)<=this.ba && Math.abs(dy)<=this.ba)
if(this.shape)
this._shapBoom();
else this._boom();
this.dead = true;
else
this._paint();
,
_drawLight:function()
ctx.save();
ctx.fillStyle = "rgba(255,228,150,0.3)";
ctx.beginPath();
ctx.arc(this.x , this.y , this.r+3*Math.random()+1 , 0 , 2*Math.PI);
ctx.fill();
ctx.restore();
,
_boom:function()
var fragNum = getRandom(30 , 200);
var style = getRandom(0,10)>=5? 1 : 2;
var color;
if(style===1)
color =
a:parseInt(getRandom(128,255)),
b:parseInt(getRandom(128,255)),
c:parseInt(getRandom(128,255))
var fanwei = parseInt(getRandom(300, 400));
for(var i=0;i<fragNum;i++)
if(style===2)
color =
a:parseInt(getRandom(128,255)),
b:parseInt(getRandom(128,255)),
c:parseInt(getRandom(128,255))
var a = getRandom(-Math.PI, Math.PI);
var x = getRandom(0, fanwei) * Math.cos(a) + this.x;
var y = getRandom(0, fanwei) * Math.sin(a) + this.y;
var radius = getRandom(0 , 2)
var frag = new Frag(this.x , this.y , radius , color , x , y );
this.booms.push(frag);
,
_shapBoom:function()
var that = this;
putValue(ocas , octx , this.shape , 5, function(dots)
var dx = canvas.width/2-that.x;
var dy = canvas.height/2-that.y;
for(var i=0;i<dots.length;i++)
color = a:dots[i].a,b:dots[i].b,c:dots[i].c
var x = dots[i].x;
var y = dots[i].y;
var radius = 1;
var frag = new Frag(that.x , that.y , radius , color , x-dx , y-dy);
that.booms.push(frag);
)
function putValue(canvas , context , ele , dr , callback)
context.clearRect(0,0,canvas.width,canvas.height);
var img = new Image();
if(ele.innerHTML.indexOf("img")>=0)
img.src = ele.getElementsByTagName("img")[0].src;
imgload(img , function()
context.drawImage(img , canvas.width/2 - img.width/2 , canvas.height/2 - img.width/2);
dots = getimgData(canvas , context , dr);
callback(dots);
)
else
var text = ele.innerHTML;
context.save();
var fontSize =200;
context.font = fontSize+"px 宋体 bold";
context.textAlign = "center";
context.textBaseline = "middle";
context.fillStyle = "rgba("+parseInt(getRandom(128,255))+","+parseInt(getRandom(128,255))+","+parseInt(getRandom(128,255))+" , 1)";
context.fillText(text , canvas.width/2 , canvas.height/2);
context.restore();
dots = getimgData(canvas , context , dr);
callback(dots);
function imgload(img , callback)
if(img.complete)
callback.call(img);
else
img.onload = function()
callback.call(this);
function getimgData(canvas , context , dr)
var imgData = context.getImageData(0,0,canvas.width , canvas.height);
context.clearRect(0,0,canvas.width , canvas.height);
var dots = [];
for(var x=0;x<imgData.width;x+=dr)
for(var y=0;y<imgData.height;y+=dr)
var i = (y*imgData.width + x)*4;
if(imgData.data[i+3] > 128)
var dot = x:x , y:y , a:imgData.data[i] , b:imgData.data[i+1] , c:imgData.data[i+2];
dots.push(dot);
return dots;
function getRandom(a , b)
return Math.random()*(b-a)+a;
var maxRadius = 1 , stars=[];
function drawBg()
for(var i=0;i<100;i++)
var r = Math.random()*maxRadius;
var x = Math.random()*canvas.width;
var y = Math.random()*2*canvas.height - canvas.height;
var star = new Star(x , y , r);
stars.push(star);
star.paint()
var Star = function(x,y,r)
this.x = x;this.y=y;this.r=r;
Star.prototype =
paint:function()
ctx.save();
ctx.beginPath();
ctx.arc(this.x , this.y , this.r , 0 , 2*Math.PI);
ctx.fillStyle = "rgba(255,255,255,"+this.r+")";
ctx.fill();
ctx.restore();
var focallength = 250;
var Frag = function(centerX , centerY , radius , color ,tx , ty)
this.tx = tx;
this.ty = ty;
this.x = centerX;
this.y = centerY;
this.dead = false;
this.centerX = centerX;
this.centerY = centerY;
this.radius = radius;
this.color = color;
Frag.prototype =
paint:function()
ctx.save();
ctx.beginPath();
ctx.arc(this.x , this.y , this.radius , 0 , 2*Math.PI);
ctx.fillStyle = "rgba("+this.color.a+","+this.color.b+","+this.color.c+",1)";
ctx.fill()
ctx.restore();
,
moveTo:function(index)
this.ty = this.ty+0.3;
var dx = this.tx - this.x , dy = this.ty - this.y;
this.x = Math.abs(dx)<0.1 ? this.tx : (this.x+dx*0.1);
this.y = Math.abs(dy)<0.1 ? this.ty : (this.y+dy*0.1);
if(dx===0 && Math.abs(dy)<=80)
this.dead = true;
this.paint();
</script>
</body>
</html>
新建文件夹img把以下两张图片放进去
city.png
moon.png
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