phaser
Version:
A fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers from the team at Phaser Studio Inc.
37 lines (34 loc) • 909 B
JavaScript
/**
* @author Richard Davey <rich@phaser.io>
* @copyright 2013-2026 Phaser Studio Inc.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
/**
* Applies a sinusoidal ease-in/out to the given value. The motion starts slowly,
* accelerates through the midpoint, and decelerates back to a stop at the end,
* producing a smooth S-curve transition. This is useful for animations that
* need a natural, symmetrical feel with gentle starts and endings.
*
* @function Phaser.Math.Easing.Sine.InOut
* @since 3.0.0
*
* @param {number} v - The value to be eased, in the range [0, 1].
*
* @return {number} The eased value, in the range [0, 1].
*/
var InOut = function (v)
{
if (v === 0)
{
return 0;
}
else if (v === 1)
{
return 1;
}
else
{
return 0.5 * (1 - Math.cos(Math.PI * v));
}
};
module.exports = InOut;