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Clean up easing functions #8518

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merged 2 commits into from
Feb 24, 2021
Merged

Clean up easing functions #8518

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be48838
Clean up easing functions
kurkle Feb 24, 2021
d8fdce3
Remove leftover comment
kurkle Feb 24, 2021
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233 changes: 60 additions & 173 deletions src/helpers/helpers.easing.js
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Original file line number Diff line number Diff line change
@@ -1,194 +1,84 @@
import {PI, TAU, HALF_PI} from './helpers.math';

const atEdge = (t) => t === 0 || t === 1;
const elasticIn = (t, s, p) => -(Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * TAU / p));
const elasticOut = (t, s, p) => Math.pow(2, -10 * t) * Math.sin((t - s) * TAU / p) + 1;

/**
* Easing functions adapted from Robert Penner's easing equations.
* @namespace Chart.helpers.easing.effects
* @see http://www.robertpenner.com/easing/
*/
const effects = {
linear(t) {
return t;
},
linear: t => t,

easeInQuad(t) {
return t * t;
},
easeInQuad: t => t * t,

easeOutQuad(t) {
return -t * (t - 2);
},
easeOutQuad: t => -t * (t - 2),

easeInOutQuad(t) {
if ((t /= 0.5) < 1) {
return 0.5 * t * t;
}
return -0.5 * ((--t) * (t - 2) - 1);
},
easeInOutQuad: t => ((t /= 0.5) < 1)
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? 0.5 * t * t
: -0.5 * ((--t) * (t - 2) - 1),

easeInCubic(t) {
return t * t * t;
},
easeInCubic: t => t * t * t,

easeOutCubic(t) {
return (t -= 1) * t * t + 1;
},
easeOutCubic: t => (t -= 1) * t * t + 1,

easeInOutCubic(t) {
if ((t /= 0.5) < 1) {
return 0.5 * t * t * t;
}
return 0.5 * ((t -= 2) * t * t + 2);
},
easeInOutCubic: t => ((t /= 0.5) < 1)
? 0.5 * t * t * t
: 0.5 * ((t -= 2) * t * t + 2),

easeInQuart(t) {
return t * t * t * t;
},
easeInQuart: t => t * t * t * t,
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easeOutQuart(t) {
return -((t -= 1) * t * t * t - 1);
},
easeOutQuart: t => -((t -= 1) * t * t * t - 1),

easeInOutQuart(t) {
if ((t /= 0.5) < 1) {
return 0.5 * t * t * t * t;
}
return -0.5 * ((t -= 2) * t * t * t - 2);
},
easeInOutQuart: t => ((t /= 0.5) < 1)
? 0.5 * t * t * t * t
: -0.5 * ((t -= 2) * t * t * t - 2),

easeInQuint(t) {
return t * t * t * t * t;
},
easeInQuint: t => t * t * t * t * t,

easeOutQuint(t) {
return (t -= 1) * t * t * t * t + 1;
},
easeOutQuint: t => (t -= 1) * t * t * t * t + 1,

easeInOutQuint(t) {
if ((t /= 0.5) < 1) {
return 0.5 * t * t * t * t * t;
}
return 0.5 * ((t -= 2) * t * t * t * t + 2);
},
easeInOutQuint: t => ((t /= 0.5) < 1)
? 0.5 * t * t * t * t * t
: 0.5 * ((t -= 2) * t * t * t * t + 2),

easeInSine(t) {
return -Math.cos(t * HALF_PI) + 1;
},
easeInSine: t => -Math.cos(t * HALF_PI) + 1,

easeOutSine(t) {
return Math.sin(t * HALF_PI);
},
easeOutSine: t => Math.sin(t * HALF_PI),

easeInOutSine(t) {
return -0.5 * (Math.cos(PI * t) - 1);
},
easeInOutSine: t => -0.5 * (Math.cos(PI * t) - 1),

easeInExpo(t) {
return (t === 0) ? 0 : Math.pow(2, 10 * (t - 1));
},
easeInExpo: t => (t === 0) ? 0 : Math.pow(2, 10 * (t - 1)),

easeOutExpo(t) {
return (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1;
},
easeOutExpo: t => (t === 1) ? 1 : -Math.pow(2, -10 * t) + 1,

easeInOutExpo(t) {
if (t === 0) {
return 0;
}
if (t === 1) {
return 1;
}
if ((t /= 0.5) < 1) {
return 0.5 * Math.pow(2, 10 * (t - 1));
}
return 0.5 * (-Math.pow(2, -10 * --t) + 2);
},
easeInOutExpo: t => atEdge(t) ? t : t < 0.5
? 0.5 * Math.pow(2, 10 * (t * 2 - 1))
: 0.5 * (-Math.pow(2, -10 * (t * 2 - 1)) + 2),

easeInCirc(t) {
if (t >= 1) {
return t;
}
return -(Math.sqrt(1 - t * t) - 1);
},
easeInCirc: t => (t >= 1) ? t : -(Math.sqrt(1 - t * t) - 1),

easeOutCirc(t) {
return Math.sqrt(1 - (t -= 1) * t);
},
easeOutCirc: t => Math.sqrt(1 - (t -= 1) * t),

easeInOutCirc(t) {
if ((t /= 0.5) < 1) {
return -0.5 * (Math.sqrt(1 - t * t) - 1);
}
return 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1);
},
easeInOutCirc: t => ((t /= 0.5) < 1)
? -0.5 * (Math.sqrt(1 - t * t) - 1)
: 0.5 * (Math.sqrt(1 - (t -= 2) * t) + 1),

easeInElastic(t) {
let s = 1.70158;
let p = 0;
let a = 1;
if (t === 0) {
return 0;
}
if (t === 1) {
return 1;
}
if (!p) {
p = 0.3;
}
if (a < 1) {
a = 1;
s = p / 4;
} else {
s = p / TAU * Math.asin(1 / a);
}
return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * TAU / p));
},
easeInElastic: t => atEdge(t) ? t : elasticIn(t, 0.075, 0.3),

easeOutElastic(t) {
let s = 1.70158;
let p = 0;
let a = 1;
if (t === 0) {
return 0;
}
if (t === 1) {
return 1;
}
if (!p) {
p = 0.3;
}
if (a < 1) {
a = 1;
s = p / 4;
} else {
s = p / TAU * Math.asin(1 / a);
}
return a * Math.pow(2, -10 * t) * Math.sin((t - s) * TAU / p) + 1;
},
easeOutElastic: t => atEdge(t) ? t : elasticOut(t, 0.075, 0.3),

easeInOutElastic(t) {
let s = 1.70158;
let p = 0;
let a = 1;
if (t === 0) {
return 0;
}
if ((t /= 0.5) === 2) {
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return 1;
}
if (!p) {
p = 0.45;
}
if (a < 1) {
a = 1;
s = p / 4;
} else {
s = p / TAU * Math.asin(1 / a);
}
if (t < 1) {
return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * TAU / p));
}
return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t - s) * TAU / p) * 0.5 + 1;
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const s = 0.1125;
const p = 0.45;
return atEdge(t) ? t :
t < 0.5
? 0.5 * elasticIn(t * 2, s, p)
: 0.5 + 0.5 * elasticOut(t * 2 - 1, s, p);
},

easeInBack(t) {
const s = 1.70158;
return t * t * ((s + 1) * t - s);
Expand All @@ -207,29 +97,26 @@ const effects = {
return 0.5 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2);
},

easeInBounce(t) {
return 1 - effects.easeOutBounce(1 - t);
},
easeInBounce: t => 1 - effects.easeOutBounce(1 - t),

easeOutBounce(t) {
if (t < (1 / 2.75)) {
return 7.5625 * t * t;
const m = 7.5625;
const d = 2.75;
if (t < (1 / d)) {
return m * t * t;
}
if (t < (2 / 2.75)) {
return 7.5625 * (t -= (1.5 / 2.75)) * t + 0.75;
if (t < (2 / d)) {
return m * (t -= (1.5 / d)) * t + 0.75;
}
if (t < (2.5 / 2.75)) {
return 7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375;
if (t < (2.5 / d)) {
return m * (t -= (2.25 / d)) * t + 0.9375;
}
return 7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375;
return m * (t -= (2.625 / d)) * t + 0.984375;
},

easeInOutBounce(t) {
if (t < 0.5) {
return effects.easeInBounce(t * 2) * 0.5;
}
return effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5;
}
easeInOutBounce: t => (t < 0.5)
? effects.easeInBounce(t * 2) * 0.5
: effects.easeOutBounce(t * 2 - 1) * 0.5 + 0.5,
};

export default effects;