retrieve method Null safety

List<O> retrieve(
  1. Rect bounds
)

Return all objects that could collide with the given object, given bounds.

Implementation

List<O> retrieve(Rect bounds) {
  final quadrants = getQuadrants(bounds);
  final List<O> objects = [...this.objects];

  /// Recursively retrieve objects from subnodes in the relevant quadrants.
  if (nodes.isNotEmpty) {
    for (final q in quadrants) {
      objects.addAll(nodes[q]!.retrieve(bounds));
    }
  }

  objects.removeDuplicates();
  return objects;
}