bc518174
 王天杨
提交两个项目文件
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import {tpmt} from "./math.js";
var tau = 2 * Math.PI,
amplitude = 1,
period = 0.3;
export var elasticIn = (function custom(a, p) {
var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);
function elasticIn(t) {
return a * tpmt(-(--t)) * Math.sin((s - t) / p);
}
elasticIn.amplitude = function(a) { return custom(a, p * tau); };
elasticIn.period = function(p) { return custom(a, p); };
return elasticIn;
})(amplitude, period);
export var elasticOut = (function custom(a, p) {
var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);
function elasticOut(t) {
return 1 - a * tpmt(t = +t) * Math.sin((t + s) / p);
}
elasticOut.amplitude = function(a) { return custom(a, p * tau); };
elasticOut.period = function(p) { return custom(a, p); };
return elasticOut;
})(amplitude, period);
export var elasticInOut = (function custom(a, p) {
var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);
function elasticInOut(t) {
return ((t = t * 2 - 1) < 0
? a * tpmt(-t) * Math.sin((s - t) / p)
: 2 - a * tpmt(t) * Math.sin((s + t) / p)) / 2;
}
elasticInOut.amplitude = function(a) { return custom(a, p * tau); };
elasticInOut.period = function(p) { return custom(a, p); };
return elasticInOut;
})(amplitude, period);
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