烟花代码"/>
动态爱心和3D旋转烟花代码
动态爱心
（可直接复制到txt记事本中，保存后把文件后缀.txt改为.html点击即可通过浏览器打开）
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
html, body {height: 100%;padding: 0;margin: 0;background: #000;
}
canvas {position: absolute;width: 70%;height: 100%;
}</style>
</head>
<body><canvas id="pinkboard"></canvas><script>
/** Settings*/
var settings = {particles: {length: 500, // maximum amount of particlesduration: 2, // particle duration in secvelocity: 100, // particle velocity in pixels/seceffect: -0.75, // play with this for a nice effectsize: 30, // particle size in pixels},
};/** RequestAnimationFrame polyfill by Erik M?ller*/
(function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());/** Point class*/
var Point = (function() {function Point(x, y) {this.x = (typeof x !== 'undefined') ? x : 0;this.y = (typeof y !== 'undefined') ? y : 0;}Point.prototype.clone = function() {return new Point(this.x, this.y);};Point.prototype.length = function(length) {if (typeof length == 'undefined')return Math.sqrt(this.x * this.x + this.y * this.y);this.normalize();this.x *= length;this.y *= length;return this;};Point.prototype.normalize = function() {var length = this.length();this.x /= length;this.y /= length;return this;};return Point;
})();/** Particle class*/
var Particle = (function() {function Particle() {this.position = new Point();this.velocity = new Point();this.acceleration = new Point();this.age = 0;}Particle.prototype.initialize = function(x, y, dx, dy) {this.position.x = x;this.position.y = y;this.velocity.x = dx;this.velocity.y = dy;this.acceleration.x = dx * settings.particles.effect;this.acceleration.y = dy * settings.particles.effect;this.age = 0;};Particle.prototype.update = function(deltaTime) {this.position.x += this.velocity.x * deltaTime;this.position.y += this.velocity.y * deltaTime;this.velocity.x += this.acceleration.x * deltaTime;this.velocity.y += this.acceleration.y * deltaTime;this.age += deltaTime;};Particle.prototype.draw = function(context, image) {function ease(t) {return (--t) * t * t + 1;}var size = image.width * ease(this.age / settings.particles.duration);context.globalAlpha = 1 - this.age / settings.particles.duration;context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);};return Particle;
})();/** ParticlePool class*/
var ParticlePool = (function() {var particles,firstActive = 0,firstFree = 0,duration = settings.particles.duration;function ParticlePool(length) {// create and populate particle poolparticles = new Array(length);for (var i = 0; i < particles.length; i++)particles[i] = new Particle();}ParticlePool.prototype.add = function(x, y, dx, dy) {particles[firstFree].initialize(x, y, dx, dy);// handle circular queuefirstFree++;if (firstFree == particles.length) firstFree = 0;if (firstActive == firstFree ) firstActive++;if (firstActive == particles.length) firstActive = 0;};ParticlePool.prototype.update = function(deltaTime) {var i;// update active particlesif (firstActive < firstFree) {for (i = firstActive; i < firstFree; i++)particles[i].update(deltaTime);}if (firstFree < firstActive) {for (i = firstActive; i < particles.length; i++)particles[i].update(deltaTime);for (i = 0; i < firstFree; i++)particles[i].update(deltaTime);}// remove inactive particleswhile (particles[firstActive].age >= duration && firstActive != firstFree) {firstActive++;if (firstActive == particles.length) firstActive = 0;}};ParticlePool.prototype.draw = function(context, image) {// draw active particlesif (firstActive < firstFree) {for (i = firstActive; i < firstFree; i++)particles[i].draw(context, image);}if (firstFree < firstActive) {for (i = firstActive; i < particles.length; i++)particles[i].draw(context, image);for (i = 0; i < firstFree; i++)particles[i].draw(context, image);}};return ParticlePool;
})();/** Putting it all together*/
(function(canvas) {var context = canvas.getContext('2d'),particles = new ParticlePool(settings.particles.length),particleRate = settings.particles.length / settings.particles.duration, // particles/sectime;// get point on heart with -PI <= t <= PIfunction pointOnHeart(t) {return new Point(160 * Math.pow(Math.sin(t), 3),130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25);}// creating the particle image using a dummy canvasvar image = (function() {var canvas = document.createElement('canvas'),context = canvas.getContext('2d');canvas.width = settings.particles.size;canvas.height = settings.particles.size;// helper function to create the pathfunction to(t) {var point = pointOnHeart(t);point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;return point;}// create the pathcontext.beginPath();var t = -Math.PI;var point = to(t);context.moveTo(point.x, point.y);while (t < Math.PI) {t += 0.01; // baby steps!point = to(t);context.lineTo(point.x, point.y);}context.closePath();// create the fillcontext.fillStyle = '#ea80b0';context.fill();// create the imagevar image = new Image();image.src = canvas.toDataURL();return image;})();// render that thing!function render() {// next animation framerequestAnimationFrame(render);// update timevar newTime = new Date().getTime() / 1000,deltaTime = newTime - (time || newTime);time = newTime;// clear canvascontext.clearRect(0, 0, canvas.width, canvas.height);// create new particlesvar amount = particleRate * deltaTime;for (var i = 0; i < amount; i++) {var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());var dir = pos.clone().length(settings.particles.velocity);particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);}// update and draw particlesparticles.update(deltaTime);particles.draw(context, image);}// handle (re-)sizing of the canvasfunction onResize() {canvas.width = canvas.clientWidth;canvas.height = canvas.clientHeight;}window.onresize = onResize;// delay rendering bootstrapsetTimeout(function() {onResize();render();}, 10);
})(document.getElementById('pinkboard'));</script></body>
</html>3D旋转烟花
（方法同上）
<!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="/";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>
<div style="text-align:center;">
</div>
</body>
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动态爱心和3D旋转烟花代码
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