void SimplePlatformerScene::drawCollisionTiles()
{
    TMXLayer* collisionLayer = _tileMapNode->getLayer("edgeLayer");
    auto mapSize = _tileMapNode->getMapSize();
    auto tileSize = _tileMapNode->getTileSize();
    Sprite* tile = nullptr;
    Point pos;
    for(int i = 0; i < mapSize.width; i++)
    {
        for(int j = 0; j < mapSize.height; j++)
        {
            tile = collisionLayer->getTileAt(Point(i, j));
            if(tile != nullptr)
            {
                const ValueMap property = _tileMapNode->getPropertiesForGID(collisionLayer->getTileGIDAt(Point(i, j))).asValueMap();
                bool collidable = property.at("collidable").asBool();
                if(collidable)
                {
                    pos = collisionLayer->getPositionAt(Point(i, j));
                    makeBoxObjAt(tile, tileSize, false, PhysicsMaterial(0.2f, 0.5f, 0.5f));
                }
            }
        }
    }
}