var easingFuncs = {
|
linear: function (k) {
|
return k;
|
},
|
quadraticIn: function (k) {
|
return k * k;
|
},
|
quadraticOut: function (k) {
|
return k * (2 - k);
|
},
|
quadraticInOut: function (k) {
|
if ((k *= 2) < 1) {
|
return 0.5 * k * k;
|
}
|
return -0.5 * (--k * (k - 2) - 1);
|
},
|
cubicIn: function (k) {
|
return k * k * k;
|
},
|
cubicOut: function (k) {
|
return --k * k * k + 1;
|
},
|
cubicInOut: function (k) {
|
if ((k *= 2) < 1) {
|
return 0.5 * k * k * k;
|
}
|
return 0.5 * ((k -= 2) * k * k + 2);
|
},
|
quarticIn: function (k) {
|
return k * k * k * k;
|
},
|
quarticOut: function (k) {
|
return 1 - (--k * k * k * k);
|
},
|
quarticInOut: function (k) {
|
if ((k *= 2) < 1) {
|
return 0.5 * k * k * k * k;
|
}
|
return -0.5 * ((k -= 2) * k * k * k - 2);
|
},
|
quinticIn: function (k) {
|
return k * k * k * k * k;
|
},
|
quinticOut: function (k) {
|
return --k * k * k * k * k + 1;
|
},
|
quinticInOut: function (k) {
|
if ((k *= 2) < 1) {
|
return 0.5 * k * k * k * k * k;
|
}
|
return 0.5 * ((k -= 2) * k * k * k * k + 2);
|
},
|
sinusoidalIn: function (k) {
|
return 1 - Math.cos(k * Math.PI / 2);
|
},
|
sinusoidalOut: function (k) {
|
return Math.sin(k * Math.PI / 2);
|
},
|
sinusoidalInOut: function (k) {
|
return 0.5 * (1 - Math.cos(Math.PI * k));
|
},
|
exponentialIn: function (k) {
|
return k === 0 ? 0 : Math.pow(1024, k - 1);
|
},
|
exponentialOut: function (k) {
|
return k === 1 ? 1 : 1 - Math.pow(2, -10 * k);
|
},
|
exponentialInOut: 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);
|
},
|
circularIn: function (k) {
|
return 1 - Math.sqrt(1 - k * k);
|
},
|
circularOut: function (k) {
|
return Math.sqrt(1 - (--k * k));
|
},
|
circularInOut: 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);
|
},
|
elasticIn: function (k) {
|
var s;
|
var a = 0.1;
|
var p = 0.4;
|
if (k === 0) {
|
return 0;
|
}
|
if (k === 1) {
|
return 1;
|
}
|
if (!a || a < 1) {
|
a = 1;
|
s = p / 4;
|
}
|
else {
|
s = p * Math.asin(1 / a) / (2 * Math.PI);
|
}
|
return -(a * Math.pow(2, 10 * (k -= 1))
|
* Math.sin((k - s) * (2 * Math.PI) / p));
|
},
|
elasticOut: function (k) {
|
var s;
|
var a = 0.1;
|
var p = 0.4;
|
if (k === 0) {
|
return 0;
|
}
|
if (k === 1) {
|
return 1;
|
}
|
if (!a || a < 1) {
|
a = 1;
|
s = p / 4;
|
}
|
else {
|
s = p * Math.asin(1 / a) / (2 * Math.PI);
|
}
|
return (a * Math.pow(2, -10 * k)
|
* Math.sin((k - s) * (2 * Math.PI) / p) + 1);
|
},
|
elasticInOut: function (k) {
|
var s;
|
var a = 0.1;
|
var p = 0.4;
|
if (k === 0) {
|
return 0;
|
}
|
if (k === 1) {
|
return 1;
|
}
|
if (!a || a < 1) {
|
a = 1;
|
s = p / 4;
|
}
|
else {
|
s = p * Math.asin(1 / a) / (2 * Math.PI);
|
}
|
if ((k *= 2) < 1) {
|
return -0.5 * (a * Math.pow(2, 10 * (k -= 1))
|
* Math.sin((k - s) * (2 * Math.PI) / p));
|
}
|
return a * Math.pow(2, -10 * (k -= 1))
|
* Math.sin((k - s) * (2 * Math.PI) / p) * 0.5 + 1;
|
},
|
backIn: function (k) {
|
var s = 1.70158;
|
return k * k * ((s + 1) * k - s);
|
},
|
backOut: function (k) {
|
var s = 1.70158;
|
return --k * k * ((s + 1) * k + s) + 1;
|
},
|
backInOut: function (k) {
|
var 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);
|
},
|
bounceIn: function (k) {
|
return 1 - easingFuncs.bounceOut(1 - k);
|
},
|
bounceOut: 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;
|
}
|
},
|
bounceInOut: function (k) {
|
if (k < 0.5) {
|
return easingFuncs.bounceIn(k * 2) * 0.5;
|
}
|
return easingFuncs.bounceOut(k * 2 - 1) * 0.5 + 0.5;
|
}
|
};
|
export default easingFuncs;
|
