phaser
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A fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers from the team at Phaser Studio Inc.
27 lines (23 loc) • 731 B
JavaScript
/**
* @author Richard Davey <rich@phaser.io>
* @copyright 2013-2025 Phaser Studio Inc.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
/**
* Returns the circumference of the given Ellipse.
*
* @function Phaser.Geom.Ellipse.Circumference
* @since 3.0.0
*
* @param {Phaser.Geom.Ellipse} ellipse - The Ellipse to get the circumference of.
*
* @return {number} The circumference of th Ellipse.
*/
var Circumference = function (ellipse)
{
var rx = ellipse.width / 2;
var ry = ellipse.height / 2;
var h = Math.pow((rx - ry), 2) / Math.pow((rx + ry), 2);
return (Math.PI * (rx + ry)) * (1 + ((3 * h) / (10 + Math.sqrt(4 - (3 * h)))));
};
module.exports = Circumference;