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animate.html
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animate.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>animate</title>
<style>
* {margin:0;padding:0;border:0;}
ul {list-style: none}
.wrapper {
padding: 10px 30px;
}
.go-btn {
background: #86c927;
color: #fff;
font-size: 14px;
padding: 10px 20px;
margin: 10px 10px;
border-radius: 8px;
outline: none;
cursor: pointer;
}
.ball-list li{
margin-top: 30px;
}
.ball-list li p {
margin-bottom: 10px;
}
.ball {
position: relative;
width: 50px;
height: 50px;
background: #2a2;
border-radius:100%;
cursor: pointer;
left: 0px;
margin-bottom: 2px;
}
.ball-css {
transition: all 1.5s cubic-bezier(0.42,0,0.58,1);
left: 800px;
}
#bezier-canvas {
border: 1px solid #e8e8e8;
}
</style>
</head>
<body>
<div class="wrapper">
<canvas id="bezier-canvas" width="150" height="150"></canvas>
<!-- <button class="go-btn">Go</button> -->
<ul class="ball-list">
<li>
<p>bezierCustom</p>
<div class="ball" data-timing="bezierCustom"></div>
<div class="ball" data-timing="bezierCustom"></div>
</li>
<li>
<p>linear</p>
<div class="ball" data-timing="linear"></div>
</li>
<li>
<p>bezierLinear</p>
<div class="ball" data-timing="bezierLinear"></div>
</li>
<li>
<p>bezierEase</p>
<div class="ball" data-timing="bezierEase"></div>
</li>
<li>
<p>bezierEaseIn</p>
<div class="ball" data-timing="bezierEaseIn"></div>
</li>
<li>
<p>quad</p>
<div class="ball" data-timing="quad"></div>
</li>
<li>
<p>bezierEaseOut</p>
<div class="ball" data-timing="bezierEaseOut"></div>
</li>
<li>
<p>quadOut</p>
<div class="ball" data-timing="quadOut"></div>
</li>
<li>
<p>bezierEaseInOut</p>
<div class="ball" data-timing="bezierEaseInOut"></div>
</li>
<li>
<p>quadInOut</p>
<div class="ball" data-timing="quadInOut"></div>
</li>
</ul>
</div>
<script>
function bezier(points, percent) {
var len = points.length
if (len < 2) return // 至少两个点
// 计算公式的多项式常数（杨辉三角规律）
var c_n_k = calcYHTriangle(len);
var x = 0, y = 0;
var temp;
// 遍历控制点
for (var j = 0; j < len; j++) {
temp = (c_n_k[j] * Math.pow((1 - percent), (len - 1) - j) * Math.pow(percent, j))
x += temp * points[j].x
y += temp * points[j].y
}
return {x: x, y: y}
}
// 贝塞尔曲线公式多项式系数常数符合杨辉三角规律
// 杨辉三角: https://baike.baidu.com/item/%E6%9D%A8%E8%BE%89%E4%B8%89%E8%A7%92
// 通过第i行，j列的数字等于 第i-1行 第j-1列 + 第j列数字的和
// 的特性，计算杨辉三角n层的数据（贝塞尔公式的每一项的常数项系数）
function calcYHTriangle(n) {
if (n == 1) return [1]
var prev;
var arr = [1, 1]; // 第二层的数据
// 第三层开始遍历
for (var i = 3; i <= n; i++) {
// 拷贝上一层的数据
prev = arr.slice(0)
// 第一个值永远是1
arr[0] = 1
// 当前层的第j个位置的值等于上一层的j-1位置 + j位置的值
// arr[j] = prev[j - 1] + prev[j]
for (var j = 1; j < i - 1; j++) {
arr[j] = prev[j - 1] + prev[j]
}
// 最后一个值永远是1
arr.push(1)
}
return arr
}
// 使用二分法，根据X的值，求出对应的t
function getTForX(points, x, epsilon) {
var t0 = 0.0
var t1 = 1.0
var t2 = 0.5
var x1;
var i = 0;
// var maxRound = 20
if (x == t0 || x == t1) {
return x
}
while(t0 < t1/* && i < maxRound*/) {
x1 = bezier(points, t2).x
if (Math.abs(x1 - x) < epsilon) {
// return t2
break;
}
if (x1 > x) {
t1 = t2
} else {
t0 = t2
}
t2 = t0 + (t1 - t0) / 2
i++
}
console.log('loop times:', i, 'x:'+x, 'x1:'+x1, 'result: ' + (x - x1))
return t2
}
function cubicBezier(x1, y1, x2, y2) {
var points = [{x:0, y:0}, {x:x1, y:y1}, {x:x2, y:y2}, {x:1, y:1}]
return function(x) {
var t = getTForX(points, x, 0.001)
return bezier(points, t).y
}
}
var Tween = {
/**
* 匀速运动
* t：已经执行时间，b：初始位置，c：总距离，d: 总时间
*/
linear: function(t, b, c, d) {
return t * c / d + b; // v = c / d 是速度，t * v 是 t时间内经过的距离，加上初始距离b，等于t时间后到达的总距离
},
/**
* 二次缓动（二次方曲线 p(t) = t ^ 2）
*/
quad: function(t, b, c, d) {
return c * (t / d) * (t / d) + b
},
quadOut: function(t, b, c, d) {
return c * (-Math.pow(t / d - 1, 2) + 1) + b
},
quadInOut: function(t, b, c, d) {
var p = t / d
if (p < 0.5) {
// 时间乘以2，位移再除以二，是为了确保一半的时间可以经过一半的距离
p = p * 2
return c * p * p / 2 + b
}
// 时间乘以2，位移再除以二，是为了确保一半的时间可以经过一半的距离
p = (p - 0.5) * 2
return c / 2 + c * (-Math.pow(p - 1, 2) + 1) / 2 + b
// 简化后就是下面的公式 ↓
// t = t / d * 2
// // 时间一半之前使用quad的公式，加速
// if (t < 1) {
// // 位移只能取一半
// return (c * t * t) / 2 + b;
// }
// // 时间一半之后用quadOut公式，减速
// // return -c / 2 * ((--t) * (t-2) - 1) + b;
// // 通俗易懂版本
// if (t / d < 0.5) {
// return this.quad(t, b, c / 2, d / 2)
// }
// return this.quadOut(t - d / 2, c / 2 + b, c / 2, d / 2)
},
bezierLinear: function(t, b, c, d) {
var point = bezier([{x:0, y:0}, {x:1, y:1}], t / d)
return point.x * c + b
},
bezierEase: function(t, b, c, d) {
var point = bezier([{x:0, y:0}, {x:0.25, y:0.1}, {x:0.25, y:1}, {x:1, y:1}], t / d)
return point.y * c + b
},
bezierEaseIn: function(t, b, c, d) {
var point = bezier([{x:0, y:0}, {x:0.42, y:0}, {x:1, y:1}, {x:1, y:1}], t / d)
return point.y * c + b
},
bezierEaseOut: function(t, b, c, d) {
var point = bezier([{x:0, y:0}, {x:0, y:0}, {x:0.58, y:1}, {x:1, y:1}], t / d)
return point.y * c + b
},
bezierEaseInOut: function(t, b, c, d) {
var point = bezier([{x:0, y:0}, {x:0.42, y:0}, {x:0.58, y:1}, {x:1, y:1}], t / d)
return point.y * c + b
},
bezierCustom: (function() {
var bezierFn = cubicBezier(0.5,1.56,0.99,0)
return function(t, b, c, d) {
return bezierFn(t / d) * c + b
}
})()
};
var requestAnimationFrame = window.requestAnimationFrame || function(fn) { setTimeout(fn, 16) };
function animate(opt) {
var startTime = Date.now();
var duration = opt.duration;
var subs = opt.subs || [];
var timer;
(function go() {
var past = Math.min(Date.now() - startTime, duration);
var percent = duration == 0 ? 1 : past / duration;
subs.forEach(function(sub) {
var distance = Tween[sub.easing || opt.easing || 'linear'](past, sub.from, sub.to, duration)
sub.step && sub.step(distance, percent)
})
if (percent == 1) {
cancelAnimationFrame(timer)
return ;
}
timer = requestAnimationFrame(go)
})()
}
var goBtn = document.querySelector('.go-btn')
var $balls = document.querySelectorAll('.ball')
var $canvas = document.querySelector('#bezier-canvas')
var ctx = $canvas.getContext('2d')
var prevDis = 0
$balls.forEach(function($ball) {
$ball.addEventListener('click', function() {
ctx.clearRect(0,0,1000,1000)
var cssBall = $ball.nextElementSibling
cssBall && cssBall.setAttribute('class', 'ball')
setTimeout(function() {
cssBall && cssBall.setAttribute('class', 'ball ball-css')
animate({
duration: 1500,
easing: $ball.getAttribute('data-timing'),
subs: [{
from: 0,
to: 800,
step: function(distance, percent) {
// console.log('dis:', distance)
prevDis = distance
$ball.style.transform = 'translateX(' + distance + 'px)'
}
}]
})
})
})
})
function sleep(time) {
console.log('sleep ' + time + 'ms start')
var now = Date.now()
while(1) {
if (Date.now() - now >= time) {
break
}
}
console.log('sleep ' + time + 'ms end')
}
</script>
</body>
</html>