phaser/src/gameobjects/tilemap/components/SetCollisionFromCollisionGroup.js

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

/**
 * Sets collision on the tiles within a layer by checking if the tile has a collision group
 * (typically defined in Tiled within the tileset collision editor). If any collision objects are
 * found, the tile's colliding information will be set. The `collides` parameter controls if
 * collision will be enabled (true) or disabled (false).
 *
 * @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 SetCollisionFromCollisionGroup = function (collides, recalculateFaces, layer)
{
    if (collides === undefined) { collides = true; }
    if (recalculateFaces === undefined) { recalculateFaces = true; }

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

            if (!tile) { continue; }

            var collisionGroup = tile.getCollisionGroup();

            // It's possible in Tiled to have a collision group without any shapes, e.g. create a
            // shape and then delete the shape.
            if (collisionGroup && collisionGroup.objects && collisionGroup.objects.length > 0)
            {
                SetTileCollision(tile, collides);
            }
        }
    }

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

module.exports = SetCollisionFromCollisionGroup;