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;
  }
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.