<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>五彩纸屑</title>
<style>
body {
background: #333;
}</style>
</head>
<body>
<script>
'use strict'
var _createClass = (function () { function defineProperties (target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor) } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor } }())
function _classCallCheck (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function') } }
var Progress = (function () {
function Progress () {
var param = arguments.length <= 0 || arguments[0] === undefined ? {} : arguments[0]
_classCallCheck(this, Progress)
this.timestamp = null
this.duration = param.duration || Progress.CONST.DURATION
this.progress = 0
this.delta = 0
this.progress = 0
this.isLoop = !!param.isLoop
this.reset()
}
Progress.prototype.reset = function reset () {
this.timestamp = null
}
Progress.prototype.start = function start (now) {
this.timestamp = now
}
Progress.prototype.tick = function tick (now) {
if (this.timestamp) {
this.delta = now - this.timestamp
this.progress = Math.min(this.delta / this.duration, 1)
if (this.progress >= 1 && this.isLoop) {
this.start(now)
}
return this.progress
} else {
return 0
}
}
_createClass(Progress, null, [{
key: 'CONST',
get: function get () {
return {
DURATION: 1000
}
}
}])
return Progress
}())
var Confetti = (function () {
function Confetti (param) {
_classCallCheck(this, Confetti)
this.parent = param.elm || document.body
this.canvas = document.createElement('canvas')
this.ctx = this.canvas.getContext('2d')
this.width = param.width || this.parent.offsetWidth
this.height = param.height || this.parent.offsetHeight
this.length = param.length || Confetti.CONST.PAPER_LENGTH
this.yRange = param.yRange || this.height * 2
this.progress = new Progress({
duration: param.duration,
isLoop: false
})
this.rotationRange = typeof param.rotationLength === 'number' ? param.rotationRange : 10
this.speedRange = typeof param.speedRange === 'number' ? param.speedRange : 10
this.sprites = []
this.canvas.style.cssText = ['display: block', 'position: absolute', 'top: 0', 'left: 0', 'pointer-events: none'].join(';')
this.render = this.render.bind(this)
this.build()
this.parent.append(this.canvas)
this.progress.start(performance.now())
requestAnimationFrame(this.render)
}
Confetti.prototype.build = function build () {
for (var i = 0; i < this.length; ++i) {
var canvas = document.createElement('canvas')
var ctx = canvas.getContext('2d')
canvas.width = Confetti.CONST.SPRITE_WIDTH
canvas.height = Confetti.CONST.SPRITE_HEIGHT
canvas.position = {
initX: Math.random() * this.width,
initY: -canvas.height - Math.random() * this.yRange
}
canvas.rotation = this.rotationRange / 2 - Math.random() * this.rotationRange
canvas.speed = this.speedRange / 2 + Math.random() * (this.speedRange / 2)
ctx.save()
ctx.fillStyle = Confetti.CONST.COLORS[Math.random() * Confetti.CONST.COLORS.length | 0]
ctx.fillRect(0, 0, canvas.width, canvas.height)
ctx.restore()
this.sprites.push(canvas)
}
}
Confetti.prototype.render = function render (now) {
var progress = this.progress.tick(now)
this.canvas.width = this.width
this.canvas.height = this.height
for (var i = 0; i < this.length; ++i) {
this.ctx.save()
this.ctx.translate(this.sprites[i].position.initX + this.sprites[i].rotation * Confetti.CONST.ROTATION_RATE * progress, this.sprites[i].position.initY + progress * (this.height + this.yRange))
this.ctx.rotate(this.sprites[i].rotation)
this.ctx.drawImage(this.sprites[i], -Confetti.CONST.SPRITE_WIDTH * Math.abs(Math.sin(progress * Math.PI * 2 * this.sprites[i].speed)) / 2, -Confetti.CONST.SPRITE_HEIGHT / 2, Confetti.CONST.SPRITE_WIDTH * Math.abs(Math.sin(progress * Math.PI * 2 * this.sprites[i].speed)), Confetti.CONST.SPRITE_HEIGHT)
this.ctx.restore()
}
requestAnimationFrame(this.render)
}
_createClass(Confetti, null, [{
key: 'CONST',
get: function get () {
return {
SPRITE_WIDTH: 9,
SPRITE_HEIGHT: 16,
PAPER_LENGTH: 100,
DURATION: 4000,
ROTATION_RATE: 50,
COLORS: ['#EF5350', '#EC407A', '#AB47BC', '#7E57C2', '#5C6BC0', '#42A5F5', '#29B6F6', '#26C6DA', '#26A69A', '#66BB6A', '#9CCC65', '#D4E157', '#FFEE58', '#FFCA28', '#FFA726', '#FF7043', '#8D6E63', '#BDBDBD', '#78909C']
}
}
}])
return Confetti
}());
((elm) => {
var DURATION = 8000
var LENGTH = 100
/* eslint-disable no-new */
new Confetti({
elm: elm,
width: window.innerWidth,
height: window.innerHeight,
length: LENGTH,
duration: DURATION
})
setTimeout(function () {
new Confetti({
elm: elm,
width: window.innerWidth,
height: window.innerHeight,
length: LENGTH,
duration: DURATION
})
}, DURATION / 2)
})()
</script>
</div>
</body>
</html>
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