Created
January 9, 2019 06:24
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Confetti
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class Progress { | |
constructor(param = {}) { | |
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(); | |
} | |
static get CONST() { | |
return { | |
DURATION : 1000 | |
}; | |
} | |
reset() { | |
this.timestamp = null; | |
} | |
start(now) { | |
this.timestamp = now; | |
} | |
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; | |
} | |
} | |
} | |
class Confetti { | |
constructor(param) { | |
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 : true | |
}); | |
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.appendChild(this.canvas); | |
this.progress.start(performance.now()); | |
requestAnimationFrame(this.render); | |
} | |
static get CONST() { | |
return { | |
SPRITE_WIDTH : 9, | |
SPRITE_HEIGHT : 16, | |
PAPER_LENGTH : 100, | |
DURATION : 8000, | |
ROTATION_RATE : 50, | |
COLORS : [ | |
"#EF5350", | |
"#EC407A", | |
"#AB47BC", | |
"#7E57C2", | |
"#5C6BC0", | |
"#42A5F5", | |
"#29B6F6", | |
"#26C6DA", | |
"#26A69A", | |
"#66BB6A", | |
"#9CCC65", | |
"#D4E157", | |
"#FFEE58", | |
"#FFCA28", | |
"#FFA726", | |
"#FF7043", | |
"#8D6E63", | |
"#BDBDBD", | |
"#78909C" | |
] | |
}; | |
} | |
build() { | |
for (let i = 0; i < this.length; ++i) { | |
let canvas = document.createElement("canvas"), | |
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); | |
} | |
} | |
render(now) { | |
let progress = this.progress.tick(now); | |
this.canvas.width = this.width; | |
this.canvas.height = this.height; | |
for (let 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); | |
} | |
} | |
(() => { | |
const DURATION = 8000, | |
LENGTH = 120; | |
new Confetti({ | |
width : window.innerWidth, | |
height : window.innerHeight, | |
length : LENGTH, | |
duration : DURATION | |
}); | |
setTimeout(() => { | |
new Confetti({ | |
width : window.innerWidth, | |
height : window.innerHeight, | |
length : LENGTH, | |
duration : DURATION | |
}); | |
}, DURATION / 2); | |
})(); |
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body { | |
background: #333; | |
} |
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