首先的准备工作：
要有 jquery.min.js??和? ?jquery.qrcode.min.js 这两个JS文件
?
script.js 的源码：
var RENDERER = {
MAX_GENERATOR_COUNT : 5,
GENERATOR_AREA_WIDTH : 300,
init : function(){
this.setParameters();
this.setup();
this.reconstructMethods();
this.bindEvent();
this.render();
},
setParameters : function(){
this.$window = $(window);
this.$container = $('#jsi-sparkler-container');
this.$canvas = $('<canvas />');
this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
this.generators= [];
this.resizeIds = [];
},
setup : function(){
this.generators.length = 0;
this.resizeIds.length = 0;
this.width = this.$container.width();
this.height = this.$container.height();
this.timeCount = this.TIME_COUNT;
this.$canvas.attr({width : this.width, height : this.height});
this.createGenerators();
},
createGenerators : function(){
var count = Math.max(1, Math.min(Math.floor(this.width / this.GENERATOR_AREA_WIDTH), this.MAX_GENERATOR_COUNT));
this.generatorAreaWidth = this.width / count;
for(var i = 0; i < count; i++){
this.generators.push(new GENERATOR(this, i));
}
},
watchWindowSize : function(){
while(this.resizeIds.length > 0){
clearTimeout(this.resizeIds.pop());
}
this.tmpWidth = this.$window.width();
this.tmpHeight = this.$window.height();
this.resizeIds.push(setTimeout(this.jdugeToStopResize, this.RESIZE_INTERVAL));
},
jdugeToStopResize : function(){
var width = this.$window.width(),
height = this.$window.height(),
stopped = (width == this.tmpWidth && height == this.tmpHeight);
this.tmpWidth = width;
this.tmpHeight = height;
if(stopped){
this.setup();
}
},
reconstructMethods : function(){
this.watchWindowSize = this.watchWindowSize.bind(this);
this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
this.render = this.render.bind(this);
},
bindEvent : function(){
this.$window.on('resize', this.watchWindowSize);
},
render : function(){
requestAnimationFrame(this.render);
this.context.clearRect(0, 0, this.width, this.height);
for(var i = 0, count = this.generators.length; i < count; i++){
this.generators[i].render(this.context);
}
}
};
var GENERATOR = function(renderer, index){
this.renderer = renderer;
this.index = index;
this.init();
};
GENERATOR.prototype = {
MAX_GENERATION_COUNT : 5,
GENERATION_RATE : 0.01,
MAX_STABILITY_COUNT : 20,
MAX_VELOCITY : 6,
CORE_RADIUS : 8,
MAX_CORE_LUMINANCE : 90,
DELTA_CORE_LUMIMANCE : 0.8,
GRAVITY : 0.1,
init : function(){
this.status = 0;
this.x = Math.round(this.renderer.generatorAreaWidth * (this.index + 0.5 + this.getRandomValue(-1, 1) / 5));
this.y = -this.CORE_RADIUS;
this.maxY = this.renderer.height * this.getRandomValue(2, 3) / 5;
this.maxTimeCount = Math.ceil((this.maxY + this.CORE_RADIUS) / (this.MAX_VELOCITY / this.getRandomValue(1, 3)));
this.timeCount = 0;
this.coreY = -this.CORE_RADIUS;
this.coreVy = 0;
this.hue = Math.round(this.getRandomValue(0, 360));
this.generationRate = 0;
this.generationCount = 0;
this.stabilityCount = this.MAX_STABILITY_COUNT / this.getRandomValue(1, 2);
this.coreLuminance = 30;
this.particles = [];
},
createParticles : function(){
for(var i = 0, count = this.generationCount; i < count; i++){
this.particles.push(new PARTICLE(this));
}
},
getRandomValue : function(min, max){
return min + (max - min) * Math.random();
},
controlStatus : function(){
switch(this.status){
case 0:
this.timeCount++;
this.y = this.maxY * this.easeInOutQuad(this.timeCount / this.maxTimeCount);
this.coreY = this.y;
if(this.timeCount == this.maxTimeCount){
this.status = 1;
}
break;
case 1:
this.coreLuminance += this.DELTA_CORE_LUMIMANCE;
if(this.coreLuminance >= this.MAX_CORE_LUMINANCE){
this.status = 2;
}
break;
case 2:
this.generationRate += this.GENERATION_RATE;
this.generationCount = Math.pow(this.generationRate, 3) * this.MAX_GENERATION_COUNT;
if(this.generationCount >= this.MAX_GENERATION_COUNT){
this.status = 3;
}
break;
case 3:
if(--this.stabilityCount <= 0){
this.status = 4;
}
break;
case 4:
this.generationRate -= this.GENERATION_RATE;
this.generationCount = Math.pow(this.generationRate, 3) * this.MAX_GENERATION_COUNT;
if(this.generationCount <= 0){
this.status = 5;
}
break;
case 5:
if(this.timeCount > 0){
this.timeCount--;
}
this.y = this.maxY * this.easeInOutQuad(this.timeCount / this.maxTimeCount);
this.coreY += this.coreVy;
this.coreVy += this.GRAVITY;
if(this.timeCount <= 0 && this.coreY > this.renderer.height + this.CORE_RADIUS && this.particles.length == 0){
this.init();
}
}
},
easeInOutQuad: function(t){
return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
},
render : function(context){
var gradient = context.createLinearGradient(0, 0, 0, this.y);
gradient.addColorStop(0, 'hsl(' + this.hue + ', 60%, ' + 10 * (1 + 2 * (1 - this.y / (this.renderer.height * 3 / 5))) + '%)');
gradient.addColorStop(1, 'hsl(' + this.hue + ', 60%, 30%)');
context.strokeStyle = gradient;
context.lineWidth = 3;
context.beginPath();
context.moveTo(this.x, 0);
context.lineTo(this.x, this.y);
context.stroke();
gradient = context.createRadialGradient(0, 0, 0, 0, 0, this.CORE_RADIUS);
gradient.addColorStop(0, 'hsl(' + this.hue + ', 60%, ' + this.coreLuminance + '%)');
gradient.addColorStop(0.5, 'hsl(' + this.hue + ', 60%, ' + this.coreLuminance * 2 / 3 + '%)');
gradient.addColorStop(1, 'hsl(' + this.hue + ', 60%, ' + this.coreLuminance / 2 + '%)');
context.save();
context.fillStyle = gradient;
context.translate(this.x, this.coreY);
context.scale(0.5, 1);
context.beginPath();
context.arc(0, 0, this.CORE_RADIUS, 0, Math.PI * 2, false);
context.fill();
context.restore();
if(this.status >= 2 && this.status <= 5){
context.save();
context.globalCompositeOperation = 'lighter';
for(var i = this.particles.length - 1; i >= 0; i--){
if(!this.particles[i].render(context)){
this.particles.splice(i, 1);
}
}
context.restore();
this.createParticles();
}
this.controlStatus();
}
};
var PARTICLE = function(generator){
this.generator = generator;
this.init();
};
PARTICLE.prototype = {
RADIUS : 15,
MAX_STROKE_COUNT : 8,
MAX_VELOCITY : 3,
MAX_OFFSET : 5,
SCALE_RATE : 0.01,
GRAVITY : 0.08,
FRICTION : 0.99,
init : function(){
var velocity = this.generator.getRandomValue(this.MAX_VELOCITY / 2, this.MAX_VELOCITY),
theta = this.generator.getRandomValue(0, Math.PI * 2),
offset = this.generator.getRandomValue(0, this.MAX_OFFSET);
this.x = this.generator.x + offset * Math.cos(theta);
this.y = this.generator.y + offset * Math.sin(theta);
this.radius = this.RADIUS;
this.strokeCount = Math.round(this.generator.getRandomValue(4, this.MAX_STROKE_COUNT)) * 2;
this.radian = Math.PI * 2 / this.strokeCount;
this.vx = velocity * Math.cos(theta);
this.vy = velocity * Math.sin(theta);
this.theta = 0;
this.scale = 1;
},
render : function(context){
context.save();
context.translate(this.x, this.y);
context.scale(this.scale, this.scale);
context.rotate(this.theta);
if(Math.random() > 0.3){
context.fillStyle = 'hsl(' + this.generator.hue + ', 60%, 30%)';
context.beginPath();
context.moveTo(0, -this.radius);
for(var i = 0, count = this.strokeCount; i < count; i++){
var radius = this.radius / ((i % 2 == 0) ? 1 : 5);
context.lineTo(radius * Math.sin(this.radian * i), -radius * Math.cos(this.radian * i));
}
context.closePath();
context.fill();
}
context.restore();
this.x += this.vx;
this.y += this.vy;
this.vy += this.GRAVITY;
this.vx *= this.FRICTION;
this.vy *= this.FRICTION;
this.scale -= this.SCALE_RATE;
this.theta += Math.PI / 100 * this.vx;
this.theta %= Math.PI * 2;
return this.scale >= 0;
}
};
$(function(){
RENDERER.init();
});?
HTML的源代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>3D烟花</title>
<style>
html,body{
margin:0px;
width:100%;
height:100%;
overflow:hidden;
background:#000;
}
#canvas{
width:100%;
height:100%;
}
</style>
</head>
<body>
<canvas id="canvas"></canvas><script>
function initVars(){
pi=Math.PI;
ctx=canvas.getContext("2d");
canvas.width=canvas.clientWidth;
canvas.height=canvas.clientHeight;
cx=canvas.width/2;
cy=canvas.height/2;
playerZ=-25;
playerX=playerY=playerVX=playerVY=playerVZ=pitch=yaw=pitchV=yawV=0;
scale=600;
seedTimer=0;seedInterval=5,seedLife=100;gravity=.02;
seeds=new Array();
sparkPics=new Array();
s="https://cantelope.org/NYE/";
for(i=1;i<=10;++i){
sparkPic=new Image();
sparkPic.src=s+"spark"+i+".png";
sparkPics.push(sparkPic);
}
sparks=new Array();
pow1=new Audio(s+"pow1.ogg");
pow2=new Audio(s+"pow2.ogg");
pow3=new Audio(s+"pow3.ogg");
pow4=new Audio(s+"pow4.ogg");
frames = 0;
}
function rasterizePoint(x,y,z){
var p,d;
x-=playerX;
y-=playerY;
z-=playerZ;
p=Math.atan2(x,z);
d=Math.sqrt(x*x+z*z);
x=Math.sin(p-yaw)*d;
z=Math.cos(p-yaw)*d;
p=Math.atan2(y,z);
d=Math.sqrt(y*y+z*z);
y=Math.sin(p-pitch)*d;
z=Math.cos(p-pitch)*d;
var rx1=-1000,ry1=1,rx2=1000,ry2=1,rx3=0,ry3=0,rx4=x,ry4=z,uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1);
if(!uc) return {x:0,y:0,d:-1};
var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;
var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;
if(!z)z=.000000001;
if(ua>0&&ua<1&&ub>0&&ub<1){
return {
x:cx+(rx1+ua*(rx2-rx1))*scale,
y:cy+y/z*scale,
d:Math.sqrt(x*x+y*y+z*z)
};
}else{
return {
x:cx+(rx1+ua*(rx2-rx1))*scale,
y:cy+y/z*scale,
d:-1
};
}
}
function spawnSeed(){
seed=new Object();
seed.x=-50+Math.random()*100;
seed.y=25;
seed.z=-50+Math.random()*100;
seed.vx=.1-Math.random()*.2;
seed.vy=-1.5;//*(1+Math.random()/2);
seed.vz=.1-Math.random()*.2;
seed.born=frames;
seeds.push(seed);
}
function splode(x,y,z){
t=5+parseInt(Math.random()*150);
sparkV=1+Math.random()*2.5;
type=parseInt(Math.random()*3);
switch(type){
case 0:
pic1=parseInt(Math.random()*10);
break;
case 1:
pic1=parseInt(Math.random()*10);
do{ pic2=parseInt(Math.random()*10); }while(pic2==pic1);
break;
case 2:
pic1=parseInt(Math.random()*10);
do{ pic2=parseInt(Math.random()*10); }while(pic2==pic1);
do{ pic3=parseInt(Math.random()*10); }while(pic3==pic1 || pic3==pic2);
break;
}
for(m=1;m<t;++m){
spark=new Object();
spark.x=x; spark.y=y; spark.z=z;
p1=pi*2*Math.random();
p2=pi*Math.random();
v=sparkV*(1+Math.random()/6)
spark.vx=Math.sin(p1)*Math.sin(p2)*v;
spark.vz=Math.cos(p1)*Math.sin(p2)*v;
spark.vy=Math.cos(p2)*v;
switch(type){
case 0: spark.img=sparkPics[pic1]; break;
case 1:
spark.img=sparkPics[parseInt(Math.random()*2)?pic1:pic2];
break;
case 2:
switch(parseInt(Math.random()*3)){
case 0: spark.img=sparkPics[pic1]; break;
case 1: spark.img=sparkPics[pic2]; break;
case 2: spark.img=sparkPics[pic3]; break;
}
break;
}
spark.radius=25+Math.random()*50;
spark.alpha=1;
spark.trail=new Array();
sparks.push(spark);
}
switch(parseInt(Math.random()*4)){
case 0: pow=new Audio(s+"pow1.ogg"); break;
case 1: pow=new Audio(s+"pow2.ogg"); break;
case 2: pow=new Audio(s+"pow3.ogg"); break;
case 3: pow=new Audio(s+"pow4.ogg"); break;
}
d=Math.sqrt((x-playerX)*(x-playerX)+(y-playerY)*(y-playerY)+(z-playerZ)*(z-playerZ));
pow.volume=1.5/(1+d/10);
pow.play();
}
function doLogic(){
if(seedTimer<frames){
seedTimer=frames+seedInterval*Math.random()*10;
spawnSeed();
}
for(i=0;i<seeds.length;++i){
seeds[i].vy+=gravity;
seeds[i].x+=seeds[i].vx;
seeds[i].y+=seeds[i].vy;
seeds[i].z+=seeds[i].vz;
if(frames-seeds[i].born>seedLife){
splode(seeds[i].x,seeds[i].y,seeds[i].z);
seeds.splice(i,1);
}
}
for(i=0;i<sparks.length;++i){
if(sparks[i].alpha>0 && sparks[i].radius>5){
sparks[i].alpha-=.01;
sparks[i].radius/=1.02;
sparks[i].vy+=gravity;
point=new Object();
point.x=sparks[i].x;
point.y=sparks[i].y;
point.z=sparks[i].z;
if(sparks[i].trail.length){
x=sparks[i].trail[sparks[i].trail.length-1].x;
y=sparks[i].trail[sparks[i].trail.length-1].y;
z=sparks[i].trail[sparks[i].trail.length-1].z;
d=((point.x-x)*(point.x-x)+(point.y-y)*(point.y-y)+(point.z-z)*(point.z-z));
if(d>9){
sparks[i].trail.push(point);
}
}else{
sparks[i].trail.push(point);
}
if(sparks[i].trail.length>5)sparks[i].trail.splice(0,1);
sparks[i].x+=sparks[i].vx;
sparks[i].y+=sparks[i].vy;
sparks[i].z+=sparks[i].vz;
sparks[i].vx/=1.075;
sparks[i].vy/=1.075;
sparks[i].vz/=1.075;
}else{
sparks.splice(i,1);
}
}
p=Math.atan2(playerX,playerZ);
d=Math.sqrt(playerX*playerX+playerZ*playerZ);
d+=Math.sin(frames/80)/1.25;
t=Math.sin(frames/200)/40;
playerX=Math.sin(p+t)*d;
playerZ=Math.cos(p+t)*d;
yaw=pi+p+t;
}
function rgb(col){
var r = parseInt((.5+Math.sin(col)*.5)*16);
var g = parseInt((.5+Math.cos(col)*.5)*16);
var b = parseInt((.5-Math.sin(col)*.5)*16);
return "#"+r.toString(16)+g.toString(16)+b.toString(16);
}
function draw(){
ctx.clearRect(0,0,cx*2,cy*2);
ctx.fillStyle="#ff8";
for(i=-100;i<100;i+=3){
for(j=-100;j<100;j+=4){
x=i;z=j;y=25;
point=rasterizePoint(x,y,z);
if(point.d!=-1){
size=250/(1+point.d);
d = Math.sqrt(x * x + z * z);
a = 0.75 - Math.pow(d / 100, 6) * 0.75;
if(a>0){
ctx.globalAlpha = a;
ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
}
}
ctx.globalAlpha=1;
for(i=0;i<seeds.length;++i){
point=rasterizePoint(seeds[i].x,seeds[i].y,seeds[i].z);
if(point.d!=-1){
size=200/(1+point.d);
ctx.fillRect(point.x-size/2,point.y-size/2,size,size);
}
}
point1=new Object();
for(i=0;i<sparks.length;++i){
point=rasterizePoint(sparks[i].x,sparks[i].y,sparks[i].z);
if(point.d!=-1){
size=sparks[i].radius*200/(1+point.d);
if(sparks[i].alpha<0)sparks[i].alpha=0;
if(sparks[i].trail.length){
point1.x=point.x;
point1.y=point.y;
switch(sparks[i].img){
case sparkPics[0]:ctx.strokeStyle="#f84";break;
case sparkPics[1]:ctx.strokeStyle="#84f";break;
case sparkPics[2]:ctx.strokeStyle="#8ff";break;
case sparkPics[3]:ctx.strokeStyle="#fff";break;
case sparkPics[4]:ctx.strokeStyle="#4f8";break;
case sparkPics[5]:ctx.strokeStyle="#f44";break;
case sparkPics[6]:ctx.strokeStyle="#f84";break;
case sparkPics[7]:ctx.strokeStyle="#84f";break;
case sparkPics[8]:ctx.strokeStyle="#fff";break;
case sparkPics[9]:ctx.strokeStyle="#44f";break;
}
for(j=sparks[i].trail.length-1;j>=0;--j){
point2=rasterizePoint(sparks[i].trail[j].x,sparks[i].trail[j].y,sparks[i].trail[j].z);
if(point2.d!=-1){
ctx.globalAlpha=j/sparks[i].trail.length*sparks[i].alpha/2;
ctx.beginPath();
ctx.moveTo(point1.x,point1.y);
ctx.lineWidth=1+sparks[i].radius*10/(sparks[i].trail.length-j)/(1+point2.d);
ctx.lineTo(point2.x,point2.y);
ctx.stroke();
point1.x=point2.x;
point1.y=point2.y;
}
}
}
ctx.globalAlpha=sparks[i].alpha;
ctx.drawImage(sparks[i].img,point.x-size/2,point.y-size/2,size,size);
}
}
}
function frame(){
if(frames>100000){
seedTimer=0;
frames=0;
}
frames++;
draw();
doLogic();
requestAnimationFrame(frame);
}
window.addEventListener("resize",()=>{
canvas.width=canvas.clientWidth;
canvas.height=canvas.clientHeight;
cx=canvas.width/2;
cy=canvas.height/2;
});
initVars();
frame();</script>
</body>
</html>
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效果图：
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