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/**
* 动画运行方式库
* - Pow
* - Expo
* - Circ
* - Sine
* - Back
* - Bounce
* - Elastic
* - Quad
* - Cubic
* - Quart
* - Quint
* @module fx/transitions
* @see [mootools/Fx.Transitions](https://mootools.net/core/docs/1.6.0/Fx/Fx.Transitions#Fx-Transitions)
* @example
* var $fx = require('@spore-ui/kit/packages/fx/fx');
* var $transitions = require('@spore-ui/kit/packages/fx/transitions');
* new $fx({
* transition : $transitions.Sine.easeInOut
* });
* new $fx({
* transition : 'Sine:In'
* });
* new $fx({
* transition : 'Sine:In:Out'
* });
*/
var $type = require('../obj/type');
var $assign = require('../obj/assign');
var $fx = require('./fx');
$fx.Transition = function (transition, params) {
Eif ($type(params) !== 'array') {
params = [params];
}
var easeIn = function (pos) {
return transition(pos, params);
};
return $assign(easeIn, {
easeIn: easeIn,
easeOut: function (pos) {
return 1 - transition(1 - pos, params);
},
easeInOut: function (pos) {
return (
(pos <= 0.5
? transition(2 * pos, params)
: 2 - transition(2 * (1 - pos), params)) / 2
);
},
});
};
var Transitions = {
linear: function (zero) {
return zero;
},
};
Transitions.extend = function (transitions) {
Object.keys(transitions).forEach(function (transition) {
Transitions[transition] = new $fx.Transition(transitions[transition]);
});
};
Transitions.extend({
Pow: function (p, x) {
return Math.pow(p, (x && x[0]) || 6);
},
Expo: function (p) {
return Math.pow(2, 8 * (p - 1));
},
Circ: function (p) {
return 1 - Math.sin(Math.acos(p));
},
Sine: function (p) {
return 1 - Math.cos(p * Math.PI / 2);
},
Back: function (p, x) {
x = (x && x[0]) || 1.618;
return Math.pow(p, 2) * ((x + 1) * p - x);
},
Bounce: function (p) {
var value;
var a = 0;
var b = 1;
while (p < (7 - 4 * a) / 11) {
value = b * b - Math.pow((11 - 6 * a - 11 * p) / 4, 2);
a += b;
b /= 2;
}
value = b * b - Math.pow((11 - 6 * a - 11 * p) / 4, 2);
return value;
},
Elastic: function (p, x) {
return (
// eslint-disable-next-line no-plusplus
Math.pow(2, 10 * --p)
* Math.cos(20 * p * Math.PI * ((x && x[0]) || 1) / 3)
);
},
});
['Quad', 'Cubic', 'Quart', 'Quint'].forEach(function (transition, i) {
Transitions[transition] = new $fx.Transition(function (p) {
return Math.pow(p, i + 2);
});
});
$fx.statics({
getTransition: function () {
var trans = this.options.transition || Transitions.Sine.easeInOut;
if (typeof trans === 'string') {
var data = trans.split(':');
trans = Transitions;
trans = trans[data[0]] || trans[data[0]];
Eif (data[1]) {
trans = trans['ease' + data[1] + (data[2] ? data[2] : '')];
}
}
return trans;
},
});
module.exports = Transitions;
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