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Easing.generateExponential() #619

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c7cf6e2
Easing.generateExponential()
trusktr Aug 2, 2021
634965f
update hello world example to use both `Exponential` and `generateExp…
trusktr Aug 2, 2021
c749e8d
Merge branch 'master' into generateExponential
trusktr Aug 2, 2021
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76 changes: 38 additions & 38 deletions examples/00_hello_world.html
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Original file line number Diff line number Diff line change
Expand Up @@ -4,73 +4,73 @@
<title>Tween.js / hello world!</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="css/style.css" media="screen" rel="stylesheet" type="text/css" />
<style>
.threedee {
position: absolute;
transform-style: preserve-3d;
transform: translate3d(0, 0, 0.1px);
}
.box {
width: 100px;
height: 100px;
padding: 1em;
box-sizing: border-box;
}
</style>
</head>
<body>
<body style="transform-style: preserve-3d; perspective: 800px;">
<div id="info">
<h1><a href="http://github.com/tweenjs/tween.js">tween.js</a></h1>
<h2>00 _ hello world</h2>
<p>Simple example for illustrating the creation and chaining of tweens.</p>
</div>
<div
id="target"
style="
position: absolute;
top: 100px;
left: 100px;
width: 100px;
height: 100px;
background: #a0dde9;
padding: 1em;
"
>
hello world!

<div class="threedee" style="transform: translate3d(0, 0, 0.1px);">
<div id="target" class="box" style="background: #a0dde9;">hello world!</div>
</div>

<div class="threedee" style="transform: translate3d(0, 120px, 0.1px);">
<div id="target2" class="box" style="background: #b0a0e9;">hello world again!</div>
</div>

<script src="../dist/tween.umd.js"></script>
<script src="js/RequestAnimationFrame.js"></script>
<script>
var position
var target
var tween, tweenBack

init()
init(document.getElementById('target'))
init(document.getElementById('target2'))
// init2()
animate()

function init() {
position = {x: 100, y: 100, rotation: 0}
target = document.getElementById('target')
tween = new TWEEN.Tween(position)
.to({x: 700, y: 200, rotation: 359}, 2000)
.delay(1000)
.easing(TWEEN.Easing.Elastic.InOut)
function init(target) {
const position = {x: 0, y: 0, rotation: 0}
const tween = new TWEEN.Tween(position)
.to({x: 700, y: 200, rotation: 360}, 2000)
.easing(TWEEN.Easing.Exponential.InOut)
.onUpdate(update)

tweenBack = new TWEEN.Tween(position)
.to({x: 100, y: 100, rotation: 0}, 3000)
.easing(TWEEN.Easing.Elastic.InOut)
const tweenBack = new TWEEN.Tween(position)
.to({x: 0, y: 0, rotation: 0}, 2000)
.easing(TWEEN.Easing.Exponential.InOut)
.onUpdate(update)

tween.chain(tweenBack)
tweenBack.chain(tween)

tween.start()

function update() {
target.style.transform = `translate3d(${position.x}px, ${position.y}px, 0.01px) rotateY(${position.rotation}deg)`
}
}

//If we register the callback animate, but the TWEEN.update(time) returns false,
//cancel/unregister the handler
function animate(time) {
var id = requestAnimationFrame(animate)

var result = TWEEN.update(time)

if (!result) cancelAnimationFrame(id)
}
var keepGoing = TWEEN.update(time)

function update() {
target.style.left = position.x + 'px'
target.style.top = position.y + 'px'
target.style.webkitTransform = 'rotate(' + Math.floor(position.rotation) + 'deg)'
target.style.MozTransform = 'rotate(' + Math.floor(position.rotation) + 'deg)'
if (!keepGoing) cancelAnimationFrame(id)
}
</script>
</body>
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1 change: 0 additions & 1 deletion package.json
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Expand Up @@ -23,7 +23,6 @@
"tween",
"interpolation"
],
"dependencies": {},
"scripts": {
"dev": "(npm run tsc-watch -- --preserveWatchOutput & p1=$!; npm run rollup-build -- --watch & p2=$!; wait $p1 $p2)",
"build": "rimraf dist .tmp && node scripts/write-version.js && npm run tsc && npm run rollup-build",
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60 changes: 60 additions & 0 deletions src/Easing.ts
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Expand Up @@ -219,6 +219,66 @@ const Easing = {
},
}
},
generateExponential: function (
// A value of 300 is makes the curve very close to Exponential with its value of 1024.
base = 300,
): {
In(amount: number): number
Out(amount: number): number
InOut(amount: number): number
} {
// https://www.desmos.com/calculator/pioplwo3zq

if (base <= 0) {
console.warn(
'base should be larger than 0. You might like to try between 20 and 400, maybe more. Setting a default value of 300.',
)
base = 300
}

function In(amount: number): number {
// Start similar to Exponential
let expo = base ** (amount - 1)

// adjust so it hits 0 when amount is 0
expo = expo - expo * (1 - amount)

return expo
}

function Out(amount: number): number {
// translate X by 1
amount = amount + 1

// Similar to In, but negate power to make the graph have a negative slope instead of positive.
let expo = base ** -(amount - 1)

// adjust so it hits 1 when amount is 1
expo = expo - expo * -(1 - amount)

// Flip it upside down, move it up by 1.
return -expo + 1
}

function InOut(amount: number): number {
amount *= 2

if (amount < 1) return In(amount) / 2

// Similar to In, but negate power to make the graph have a negative slope instead of positive.
let expo = base ** -(amount - 1)

// adjust so it hits 1 when amount is 1
expo = expo - expo * -(1 - amount)

// Flip it upside down, move it up by 2.
expo = -expo + 2

return expo / 2
}

return {In, Out, InOut}
},
}

export default Easing