mirror of
https://github.com/photonstorm/phaser
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48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2019 Photon Storm Ltd.
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* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
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*/
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var GetPoint = require('./GetPoint');
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var Perimeter = require('./Perimeter');
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// Return an array of points from the perimeter of the rectangle
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// each spaced out based on the quantity or step required
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/**
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* Return an array of points from the perimeter of the rectangle, each spaced out based on the quantity or step required.
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*
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* @function Phaser.Geom.Rectangle.GetPoints
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* @since 3.0.0
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*
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* @generic {Phaser.Geom.Point[]} O - [out,$return]
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*
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* @param {Phaser.Geom.Rectangle} rectangle - The Rectangle object to get the points from.
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* @param {number} step - Step between points. Used to calculate the number of points to return when quantity is falsy. Ignored if quantity is positive.
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* @param {integer} quantity - The number of evenly spaced points from the rectangles perimeter to return. If falsy, step param will be used to calculate the number of points.
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* @param {(array|Phaser.Geom.Point[])} [out] - An optional array to store the points in.
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*
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* @return {(array|Phaser.Geom.Point[])} An array of Points from the perimeter of the rectangle.
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*/
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var GetPoints = function (rectangle, quantity, stepRate, out)
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{
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if (out === undefined) { out = []; }
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// If quantity is a falsey value (false, null, 0, undefined, etc) then we calculate it based on the stepRate instead.
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if (!quantity)
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{
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quantity = Perimeter(rectangle) / stepRate;
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}
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for (var i = 0; i < quantity; i++)
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{
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var position = i / quantity;
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out.push(GetPoint(rectangle, position));
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}
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return out;
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};
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module.exports = GetPoints;
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