/** * @author Richard Davey * @copyright 2018 Photon Storm Ltd. * @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License} */ var Vector2 = require('../math/Vector2'); // Iterate through items changing the position of each element to // be that of the element that came before it in the array (or after it if direction = 1) // The first items position is set to x/y. // The final x/y coords are returned /** * [description] * * @function Phaser.Actions.ShiftPosition * @since 3.0.0 * * @param {array} items - An array of Game Objects. The contents of this array are updated by this Action. * @param {number} x - [description] * @param {number} y - [description] * @param {integer} [direction=0] - [description] * @param {Phaser.Math.Vector2|object} [output] - [description] * * @return {Phaser.Math.Vector2} The output vector. */ var ShiftPosition = function (items, x, y, direction, output) { if (direction === undefined) { direction = 0; } if (output === undefined) { output = new Vector2(); } var px; var py; if (items.length > 1) { var i; var cx; var cy; var cur; if (direction === 0) { // Bottom to Top var len = items.length - 1; px = items[len].x; py = items[len].y; for (i = len - 1; i >= 0; i--) { // Current item cur = items[i]; // Get current item x/y, to be passed to the next item in the list cx = cur.x; cy = cur.y; // Set current item to the previous items x/y cur.x = px; cur.y = py; // Set current as previous px = cx; py = cy; } // Update the head item to the new x/y coordinates items[len].x = x; items[len].y = y; } else { // Top to Bottom px = items[0].x; py = items[0].y; for (i = 1; i < items.length; i++) { // Current item cur = items[i]; // Get current item x/y, to be passed to the next item in the list cx = cur.x; cy = cur.y; // Set current item to the previous items x/y cur.x = px; cur.y = py; // Set current as previous px = cx; py = cy; } // Update the head item to the new x/y coordinates items[0].x = x; items[0].y = y; } } else { px = items[0].x; py = items[0].y; items[0].x = x; items[0].y = y; } // Return the final set of coordinates as they're effectively lost from the shift and may be needed output.x = px; output.y = py; return output; }; module.exports = ShiftPosition;