mirror of
https://github.com/photonstorm/phaser
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43 lines
1.6 KiB
JavaScript
43 lines
1.6 KiB
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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/**
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* Takes an array of Game Objects and positions them on evenly spaced points around the perimeter of a Circle.
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*
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* If you wish to pass a `Phaser.GameObjects.Circle` Shape to this function, you should pass its `geom` property.
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*
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* @function Phaser.Actions.PlaceOnCircle
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* @since 3.0.0
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*
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* @generic {Phaser.GameObjects.GameObject[]} G - [items,$return]
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*
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* @param {(array|Phaser.GameObjects.GameObject[])} items - An array of Game Objects. The contents of this array are updated by this Action.
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* @param {Phaser.Geom.Circle} circle - The Circle to position the Game Objects on.
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* @param {number} [startAngle=0] - Optional angle to start position from, in radians.
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* @param {number} [endAngle=6.28] - Optional angle to stop position at, in radians.
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*
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* @return {(array|Phaser.GameObjects.GameObject[])} The array of Game Objects that was passed to this Action.
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*/
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var PlaceOnCircle = function (items, circle, startAngle, endAngle)
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{
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if (startAngle === undefined) { startAngle = 0; }
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if (endAngle === undefined) { endAngle = 6.28; }
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var angle = startAngle;
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var angleStep = (endAngle - startAngle) / items.length;
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for (var i = 0; i < items.length; i++)
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{
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items[i].x = circle.x + (circle.radius * Math.cos(angle));
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items[i].y = circle.y + (circle.radius * Math.sin(angle));
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angle += angleStep;
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}
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return items;
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};
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module.exports = PlaceOnCircle;
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