SetCollision.js

var SetTileCollision = require('./SetTileCollision');
var CalculateFacesWithin = require('./CalculateFacesWithin');
var SetLayerCollisionIndex = require('./SetLayerCollisionIndex');

/**
 * Sets collision on the given tile or tiles within a layer by index. You can pass in either a
 * single numeric index or an array of indexes: [2, 3, 15, 20]. The `collides` parameter controls if
 * collision will be enabled (true) or disabled (false).
 *
 * @param {integer|array} indexes - Either a single tile index, or an array of tile indexes.
 * @param {boolean} [collides=true] - If true it will enable collision. If false it will clear
 * collision.
 * @param {boolean} [recalculateFaces=true] - Whether or not to recalculate the tile faces after the
 * update.
 * @param {LayerData} layer - [description]
 */
var SetCollision = function (indexes, collides, recalculateFaces, layer)
{
    if (collides === undefined) { collides = true; }
    if (recalculateFaces === undefined) { recalculateFaces = true; }
    if (!Array.isArray(indexes)) { indexes = [ indexes ]; }

    // Update the array of colliding indexes
    for (var i = 0; i < indexes.length; i++)
    {
        SetLayerCollisionIndex(indexes[i], collides, layer);
    }

    // Update the tiles
    for (var ty = 0; ty < layer.height; ty++)
    {
        for (var tx = 0; tx < layer.width; tx++)
        {
            var tile = layer.data[ty][tx];

            if (tile && indexes.indexOf(tile.index) !== -1)
            {
                SetTileCollision(tile, collides);
            }
        }
    }

    if (recalculateFaces) { CalculateFacesWithin(0, 0, layer.width, layer.height, layer); }
};

module.exports = SetCollision;