mirror of
https://github.com/photonstorm/phaser
synced 2024-11-23 21:24:09 +00:00
36 lines
619 B
TypeScript
36 lines
619 B
TypeScript
/// <reference path="../../Game.ts" />
|
|
|
|
/**
|
|
* Phaser - Easing - Exponential
|
|
*
|
|
* For use with Phaser.Tween
|
|
*/
|
|
|
|
module Phaser.Easing {
|
|
|
|
export class Exponential {
|
|
|
|
public static In(k) {
|
|
|
|
return k === 0 ? 0 : Math.pow(1024, k - 1);
|
|
|
|
}
|
|
|
|
public static Out(k) {
|
|
|
|
return k === 1 ? 1 : 1 - Math.pow(2, -10 * k);
|
|
|
|
}
|
|
|
|
public static InOut(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);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|