Copy.js

var GetTilesWithin = require('./GetTilesWithin');
var CalculateFacesWithin = require('./CalculateFacesWithin');

/**
 * Copies the tiles in the source rectangular area to a new destination (all specified in tile
 * coordinates) within the layer. This copies all tile properties & recalculates collision
 * information in the destination region.
 *
 * @param {integer} srcTileX - [description]
 * @param {integer} srcTileY - [description]
 * @param {integer} width - [description]
 * @param {integer} height - [description]
 * @param {integer} destTileX - [description]
 * @param {integer} destTileY - [description]
 * @param {integer} destTileY - [description]
 * @param {boolean} [recalculateFaces=true] - [description]
 * @param {LayerData} layer - [description]
 */
var Copy = function (srcTileX, srcTileY, width, height, destTileX, destTileY, recalculateFaces, layer)
{
    if (srcTileX < 0) { srcTileX = 0; }
    if (srcTileY < 0) { srcTileY = 0; }
    if (recalculateFaces === undefined) { recalculateFaces = true; }

    var srcTiles = GetTilesWithin(srcTileX, srcTileY, width, height, null, layer);

    var offsetX = destTileX - srcTileX;
    var offsetY = destTileY - srcTileY;

    for (var i = 0; i < srcTiles.length; i++)
    {
        var tileX = srcTiles[i].x + offsetX;
        var tileY = srcTiles[i].y + offsetY;
        if (tileX >= 0 && tileX < layer.width && tileY >= 0 && tileY < layer.height)
        {
            if (layer.data[tileY][tileX])
            {
                layer.data[tileY][tileX].copy(srcTiles[i]);
            }
        }
    }

    if (recalculateFaces)
    {
        // Recalculate the faces within the destination area and neighboring tiles
        CalculateFacesWithin(destTileX - 1, destTileY - 1, width + 2, height + 2, layer);
    }
};

module.exports = Copy;