phaser/src/actions/PlaceOnRectangle.js
2018-01-09 21:43:56 +00:00

47 lines
1.3 KiB
JavaScript

var MarchingAnts = require('../geom/rectangle/MarchingAnts');
var RotateLeft = require('../utils/array/RotateLeft');
var RotateRight = require('../utils/array/RotateRight');
// Place the items in the array around the perimeter of the given rectangle.
// Placement starts from the top-left of the rectangle, and proceeds in a
// clockwise direction. If the shift parameter is given you can offset where
// placement begins.
/**
* [description]
*
* @function Phaser.Actions.PlaceOnRectangle
* @since 3.0.0
*
* @param {array} items - An array of Game Objects. The contents of this array are updated by this Action.
* @param {Phaser.Geom.Rectangle} rect - [description]
* @param {integer} [shift=1] - [description]
*
* @return {array} The array of Game Objects that was passed to this Action.
*/
var PlaceOnRectangle = function (items, rect, shift)
{
if (shift === undefined) { shift = 0; }
var points = MarchingAnts(rect, false, items.length);
if (shift > 0)
{
RotateLeft(points, shift);
}
else if (shift < 0)
{
RotateRight(points, Math.abs(shift));
}
for (var i = 0; i < items.length; i++)
{
items[i].x = points[i].x;
items[i].y = points[i].y;
}
return items;
};
module.exports = PlaceOnRectangle;