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/*
* Tween.js - Licensed under the MIT license
* https://github.com/tweenjs/tween.js
*/
/**
* Easing Function :<br>
* <p>
* Easing.Linear.None<br>
* Easing.Quadratic.In<br>
* Easing.Quadratic.Out<br>
* Easing.Quadratic.InOut<br>
* Easing.Cubic.In<br>
* Easing.Cubic.Out<br>
* Easing.Cubic.InOut<br>
* Easing.Quartic.In<br>
* Easing.Quartic.Out<br>
* Easing.Quartic.InOut<br>
* Easing.Quintic.In<br>
* Easing.Quintic.Out<br>
* Easing.Quintic.InOut<br>
* Easing.Sinusoidal.In<br>
* Easing.Sinusoidal.Out<br>
* Easing.Sinusoidal.InOut<br>
* Easing.Exponential.In<br>
* Easing.Exponential.Out<br>
* Easing.Exponential.InOut<br>
* Easing.Circular.In<br>
* Easing.Circular.Out<br>
* Easing.Circular.InOut<br>
* Easing.Elastic.In<br>
* Easing.Elastic.Out<br>
* Easing.Elastic.InOut<br>
* Easing.Back.In<br>
* Easing.Back.Out<br>
* Easing.Back.InOut<br>
* Easing.Bounce.In<br>
* Easing.Bounce.Out<br>
* Easing.Bounce.InOut
* </p>
* @public
* @constant
* @enum {Function}
* @name Easing
* @memberof Tween
*/
export let Easing = {
Linear: {
/** @ignore */
None: function (k) {
return k;
}
},
Quadratic: {
/** @ignore */
In: function (k) {
return k * k;
},
/** @ignore */
Out: function (k) {
return k * (2 - k);
},
/** @ignore */
InOut: function (k) {
if ((k *= 2) < 1) return 0.5 * k * k;
return - 0.5 * (--k * (k - 2) - 1);
}
},
Cubic: {
/** @ignore */
In: function (k) {
return k * k * k;
},
/** @ignore */
Out: function (k) {
return --k * k * k + 1;
},
/** @ignore */
InOut: function (k) {
if ((k *= 2) < 1) return 0.5 * k * k * k;
return 0.5 * ((k -= 2) * k * k + 2);
}
},
Quartic: {
/** @ignore */
In: function (k) {
return k * k * k * k;
},
/** @ignore */
Out: function (k) {
return 1 - (--k * k * k * k);
},
/** @ignore */
InOut: function (k) {
if ((k *= 2) < 1) return 0.5 * k * k * k * k;
return - 0.5 * ((k -= 2) * k * k * k - 2);
}
},
Quintic: {
/** @ignore */
In: function (k) {
return k * k * k * k * k;
},
/** @ignore */
Out: function (k) {
return --k * k * k * k * k + 1;
},
/** @ignore */
InOut: function (k) {
if ((k *= 2) < 1) return 0.5 * k * k * k * k * k;
return 0.5 * ((k -= 2) * k * k * k * k + 2);
}
},
Sinusoidal: {
/** @ignore */
In: function (k) {
return 1 - Math.cos(k * Math.PI / 2);
},
/** @ignore */
Out: function (k) {
return Math.sin(k * Math.PI / 2);
},
/** @ignore */
InOut: function (k) {
return 0.5 * (1 - Math.cos(Math.PI * k));
}
},
Exponential: {
/** @ignore */
In: function (k) {
return k === 0 ? 0 : Math.pow(1024, k - 1);
},
/** @ignore */
Out: function (k) {
return k === 1 ? 1 : 1 - Math.pow(2, - 10 * k);
},
/** @ignore */
InOut: function (k) {
if (k === 0) return 0;
if (k === 1) return 1;
if ((k *= 2) < 1) return 0.5 * Math.pow(1024, k - 1);
return 0.5 * (- Math.pow(2, - 10 * (k - 1)) + 2);
}
},
Circular: {
/** @ignore */
In: function (k) {
return 1 - Math.sqrt(1 - k * k);
},
/** @ignore */
Out: function (k) {
return Math.sqrt(1 - (--k * k));
},
/** @ignore */
InOut: function (k) {
if ((k *= 2) < 1) return - 0.5 * (Math.sqrt(1 - k * k) - 1);
return 0.5 * (Math.sqrt(1 - (k -= 2) * k) + 1);
}
},
Elastic: {
/** @ignore */
In: function (k) {
if (k === 0) {
return 0;
}
if (k === 1) {
return 1;
}
return -Math.pow(2, 10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI);
},
/** @ignore */
Out: function (k) {
if (k === 0) {
return 0;
}
if (k === 1) {
return 1;
}
return Math.pow(2, -10 * k) * Math.sin((k - 0.1) * 5 * Math.PI) + 1;
},
/** @ignore */
InOut: function (k) {
if (k === 0) {
return 0;
}
if (k === 1) {
return 1;
}
k *= 2;
if (k < 1) {
return -0.5 * Math.pow(2, 10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI);
}
return 0.5 * Math.pow(2, -10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI) + 1;
}
},
Back: {
/** @ignore */
In: function (k) {
const s = 1.70158;
return k * k * ((s + 1) * k - s);
},
/** @ignore */
Out: function (k) {
const s = 1.70158;
return --k * k * ((s + 1) * k + s) + 1;
},
/** @ignore */
InOut: function (k) {
const s = 1.70158 * 1.525;
if ((k *= 2) < 1) return 0.5 * (k * k * ((s + 1) * k - s));
return 0.5 * ((k -= 2) * k * ((s + 1) * k + s) + 2);
}
},
Bounce: {
/** @ignore */
In: function (k) {
return 1 - Easing.Bounce.Out(1 - k);
},
/** @ignore */
Out: function (k) {
if (k < (1 / 2.75)) {
return 7.5625 * k * k;
} else if (k < (2 / 2.75)) {
return 7.5625 * (k -= (1.5 / 2.75)) * k + 0.75;
} else if (k < (2.5 / 2.75)) {
return 7.5625 * (k -= (2.25 / 2.75)) * k + 0.9375;
} else {
return 7.5625 * (k -= (2.625 / 2.75)) * k + 0.984375;
}
},
/** @ignore */
InOut: function (k) {
if (k < 0.5) return Easing.Bounce.In(k * 2) * 0.5;
return Easing.Bounce.Out(k * 2 - 1) * 0.5 + 0.5;
}
}
};