code: function _quadCollision(corners, quadCorners) {
      var indexes = [];
  
      // Iterating through quads
      for (var i = 0; i < 4; i++)
        if (_geom.collision(corners, quadCorners[i]))
          indexes.push(i);
  
      return indexes;
    }
docs: Get a list of indexes of nodes containing a non-axis-aligned rectangle
  
  @param  {array}  corners      An array containing each corner of the
  rectangle defined by its coordinates (x, y).
  @param  {array}  quadCorners  An array of the quad nodes' corners.
  @return {array}               An array of indexes containing one to
  four integers.