easing-js
Version:
Penner easing functions for node
225 lines (223 loc) • 6.16 kB
JavaScript
;
exports.__esModule = true;
var Easing = {
linear: function linear(t, b, c, d) {
return c * t / d + b;
},
easeInQuad: function easeInQuad(t, b, c, d) {
return c * (t /= d) * t + b;
},
easeOutQuad: function easeOutQuad(t, b, c, d) {
return -c * (t /= d) * (t - 2) + b;
},
easeInOutQuad: function easeInOutQuad(t, b, c, d) {
if ((t /= d / 2) < 1) {
return c / 2 * t * t + b;
} else {
return -c / 2 * (--t * (t - 2) - 1) + b;
}
},
easeInCubic: function easeInCubic(t, b, c, d) {
return c * (t /= d) * t * t + b;
},
easeOutCubic: function easeOutCubic(t, b, c, d) {
return c * ((t = t / d - 1) * t * t + 1) + b;
},
easeInOutCubic: function easeInOutCubic(t, b, c, d) {
if ((t /= d / 2) < 1) {
return c / 2 * t * t * t + b;
} else {
return c / 2 * ((t -= 2) * t * t + 2) + b;
}
},
easeInQuart: function easeInQuart(t, b, c, d) {
return c * (t /= d) * t * t * t + b;
},
easeOutQuart: function easeOutQuart(t, b, c, d) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
},
easeInOutQuart: function easeInOutQuart(t, b, c, d) {
if ((t /= d / 2) < 1) {
return c / 2 * t * t * t * t + b;
} else {
return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
}
},
easeInQuint: function easeInQuint(t, b, c, d) {
return c * (t /= d) * t * t * t * t + b;
},
easeOutQuint: function easeOutQuint(t, b, c, d) {
return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
},
easeInOutQuint: function easeInOutQuint(t, b, c, d) {
if ((t /= d / 2) < 1) {
return c / 2 * t * t * t * t * t + b;
} else {
return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
}
},
easeInSine: function easeInSine(t, b, c, d) {
return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
},
easeOutSine: function easeOutSine(t, b, c, d) {
return c * Math.sin(t / d * (Math.PI / 2)) + b;
},
easeInOutSine: function easeInOutSine(t, b, c, d) {
return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
},
easeInExpo: function easeInExpo(t, b, c, d) {
var _ref;
return (_ref = t === 0) !== null ? _ref : {
b: c * Math.pow(2, 10 * (t / d - 1)) + b
};
},
easeOutExpo: function easeOutExpo(t, b, c, d) {
var _ref;
return (_ref = t === d) !== null ? _ref : b + {
c: c * (-Math.pow(2, -10 * t / d) + 1) + b
};
},
easeInOutExpo: function easeInOutExpo(t, b, c, d) {
if (t === 0) {
b;
}
if (t === d) {
b + c;
}
if ((t /= d / 2) < 1) {
return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
} else {
return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
}
},
easeInCirc: function easeInCirc(t, b, c, d) {
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
},
easeOutCirc: function easeOutCirc(t, b, c, d) {
return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
},
easeInOutCirc: function easeInOutCirc(t, b, c, d) {
if ((t /= d / 2) < 1) {
return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
} else {
return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
}
},
easeInElastic: function easeInElastic(t, b, c, d) {
var a, p, s;
s = 1.70158;
p = 0;
a = c;
if (t === 0) {
b;
} else if ((t /= d) === 1) {
b + c;
}
if (!p) {
p = d * 0.3;
}
if (a < Math.abs(c)) {
a = c;
s = p / 4;
} else {
s = p / (2 * Math.PI) * Math.asin(c / a);
}
return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
},
easeOutElastic: function easeOutElastic(t, b, c, d) {
var a, p, s;
s = 1.70158;
p = 0;
a = c;
if (t === 0) {
b;
} else if ((t /= d) === 1) {
b + c;
}
if (!p) {
p = d * 0.3;
}
if (a < Math.abs(c)) {
a = c;
s = p / 4;
} else {
s = p / (2 * Math.PI) * Math.asin(c / a);
}
return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
},
easeInOutElastic: function easeInOutElastic(t, b, c, d) {
var a, p, s;
s = 1.70158;
p = 0;
a = c;
if (t === 0) {
b;
} else if ((t /= d / 2) === 2) {
b + c;
}
if (!p) {
p = d * (0.3 * 1.5);
}
if (a < Math.abs(c)) {
a = c;
s = p / 4;
} else {
s = p / (2 * Math.PI) * Math.asin(c / a);
}
if (t < 1) {
return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
} else {
return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * 0.5 + c + b;
}
},
easeInBack: function easeInBack(t, b, c, d, s) {
if (s === void 0) {
s = 1.70158;
}
return c * (t /= d) * t * ((s + 1) * t - s) + b;
},
easeOutBack: function easeOutBack(t, b, c, d, s) {
if (s === void 0) {
s = 1.70158;
}
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
},
easeInOutBack: function easeInOutBack(t, b, c, d, s) {
if (s === void 0) {
s = 1.70158;
}
if ((t /= d / 2) < 1) {
return c / 2 * (t * t * (((s *= 1.525) + 1) * t - s)) + b;
} else {
return c / 2 * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b;
}
},
easeInBounce: function easeInBounce(t, b, c, d) {
var v;
v = Easing.easeOutBounce(d - t, 0, c, d);
return c - v + b;
},
easeOutBounce: function easeOutBounce(t, b, c, d) {
if ((t /= d) < 1 / 2.75) {
return c * (7.5625 * t * t) + b;
} else if (t < 2 / 2.75) {
return c * (7.5625 * (t -= 1.5 / 2.75) * t + 0.75) + b;
} else if (t < 2.5 / 2.75) {
return c * (7.5625 * (t -= 2.25 / 2.75) * t + 0.9375) + b;
} else {
return c * (7.5625 * (t -= 2.625 / 2.75) * t + 0.984375) + b;
}
},
easeInOutBounce: function easeInOutBounce(t, b, c, d) {
var v;
if (t < d / 2) {
v = Easing.easeInBounce(t * 2, 0, c, d);
return v * 0.5 + b;
} else {
v = Easing.easeOutBounce(t * 2 - d, 0, c, d);
return v * 0.5 + c * 0.5 + b;
}
}
};
exports.default = Easing;
module.exports = exports["default"];