HTML5实现动态爱⼼⽹页代码
HTML5 实现动态爱⼼⽹页代码
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代码如下：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>canvas爱⼼</title>
<style>
html, body {
height:100%;
padding:0;
margin:0;
background: #000;
}
canvas {
position: absolute;
width:100%;
height:100%;
}</style>
</head>
<body>
<canvas id="pinkboard"></canvas>
<script>
/*
* Settings
*/
var settings ={
particles:{
length:500,// maximum amount of particles
duration:2,// particle duration in sec
velocity:100,// particle velocity in pixels/sec
effect:-0.75,// play with this for a nice effect
size: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&&!questAnimationFrame;++a){questAnimationFrame=windo w[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"] }if(!questAnimationFrame){questAnimationFrame=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')
if(typeof length =='undefined')
return Math.sqrt(this.x * this.x + this.y * this.y);
this.x *= length;
this.y *= length;
return this;
};
alize =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 pool
particles = new Array(length);
for(var i =0; i < particles.length; i++)
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 queue
firstFree++;
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 particles
if(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 particles
while(particles[firstActive].age >= duration && firstActive != firstFree){
firstActive++;
if(firstActive == particles.length) firstActive =0;
}
};
ParticlePool.prototype.draw =function(context, image){
// draw active particles
if(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 = Context('2d'),
particles = new ParticlePool(settings.particles.length),
particleRate = settings.particles.length / settings.particles.duration,// particles/sec
time;
// get point on heart with -PI <= t <= PI
function pointOnHeart(t){
return new Point(
160* Math.pow(Math.sin(t),3),
130* s(t)-50* s(2* t)-20* s(3* t)-10* s(4* t)+25 );
);
}
// creating the particle image using a dummy canvas
var image =(function(){
var canvas  = ateElement('canvas'),
context = Context('2d');
canvas.width  = settings.particles.size;
canvas.height = settings.particles.size;
// helper function to create the path
function 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 path
context.beginPath();
var t =-Math.PI;
var point =to(t);
while(t < Math.PI){
t +=0.01;// baby steps!
html framepoint =to(t);
context.lineTo(point.x, point.y);
}
context.closePath();
// create the fill
context.fillStyle ='#ea80b0';
context.fill();
// create the image
var image = new Image();
image.src = DataURL();
return image;
})();
// render that thing!
function render(){
// next animation frame
requestAnimationFrame(render);
// update time
var newTime  = new Date().getTime()/1000,
deltaTime = newTime -(time || newTime);
time = newTime;
// clear canvas
context.clearRect(0,0, canvas.width, canvas.height);
// create new particles
var 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 particles
particles.update(deltaTime);
particles.draw(context, image);
}
/
/ handle (re-)sizing of the canvas
function onResize(){
canvas.width  = canvas.clientWidth;
canvas.height = canvas.clientHeight;
canvas.height = canvas.clientHeight;
}
// delay rendering bootstrap
setTimeout(function(){
onResize();
render();
},10);
})(ElementById('pinkboard'));</script>
</body>
</html>

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