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https://github.com/photonstorm/phaser
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42 lines
960 B
JavaScript
42 lines
960 B
JavaScript
/**
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* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2020 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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var Length = require('../line/Length');
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var Line = require('../line/Line');
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/**
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* Returns the perimeter of the given Polygon.
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*
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* @function Phaser.Geom.Polygon.Perimeter
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* @since 3.12.0
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*
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* @param {Phaser.Geom.Polygon} polygon - The Polygon to get the perimeter of.
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*
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* @return {number} The perimeter of the Polygon.
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*/
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var Perimeter = function (polygon)
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{
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var points = polygon.points;
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var perimeter = 0;
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for (var i = 0; i < points.length; i++)
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{
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var pointA = points[i];
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var pointB = points[(i + 1) % points.length];
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var line = new Line(
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pointA.x,
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pointA.y,
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pointB.x,
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pointB.y
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);
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perimeter += Length(line);
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}
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return perimeter;
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};
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module.exports = Perimeter;
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