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CircumferencePoint.js
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CircumferencePoint.js
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/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2020 Photon Storm Ltd.
* @license {@link https://opensource.org/licenses/MIT|MIT License}
*/
var Point = require('../point/Point');
/**
* Returns a Point object containing the coordinates of a point on the circumference of the Ellipse based on the given angle.
*
* @function Phaser.Geom.Ellipse.CircumferencePoint
* @since 3.0.0
*
* @generic {Phaser.Geom.Point} O - [out,$return]
*
* @param {Phaser.Geom.Ellipse} ellipse - The Ellipse to get the circumference point on.
* @param {number} angle - The angle from the center of the Ellipse to the circumference to return the point from. Given in radians.
* @param {(Phaser.Geom.Point|object)} [out] - A Point, or point-like object, to store the results in. If not given a Point will be created.
*
* @return {(Phaser.Geom.Point|object)} A Point object where the `x` and `y` properties are the point on the circumference.
*/
var CircumferencePoint = function (ellipse, angle, out)
{
if (out === undefined) { out = new Point(); }
var halfWidth = ellipse.width / 2;
var halfHeight = ellipse.height / 2;
out.x = ellipse.x + halfWidth * Math.cos(angle);
out.y = ellipse.y + halfHeight * Math.sin(angle);
return out;
};
module.exports = CircumferencePoint;