一个很简单的canvas来实现的.
首先,先来看下效果图.
演示地址:点击跳转
源地址: https://www.baiyeovo.cn/love/1.html
代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>我不说我爱你,哈哈哈</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
*/
/**
* @description: Le西屿
* @param {type} new Data
* @return: 爱心代码
*/
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 Möller
*/
; (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 pool
particles = 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 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 = canvas.getContext('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 * 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 canvas
var 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 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)
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 fill
context.fillStyle = '#ea80b0'
context.fill()
// create the image
var image = new Image()
image.src = canvas.toDataURL()
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
}
window.onresize = onResize
// delay rendering bootstrap
setTimeout(function () {
onResize()
render()
}, 10)
})(document.getElementById('pinkboard'))
</script>
</body>
</html>
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