copy method

@override GridDijkstraState copy()

Implementation

@override
GridDijkstraState copy() {
  var newState = GridDijkstraState(
    start: start,
    target: target,
    grid: List.generate(grid.length, (i) => List.from(grid[i])),
    parents: HashMap.from(parents),
    dirs: List.from(dirs),
    gCost: HashMap.from(gCost),
    open: PriorityQueue<GridPoint>((a, b) => gCost[a]!.compareTo(gCost[b]!)),
    status: status,
  );

  newState.open = PriorityQueue<GridPoint>(
      (a, b) => newState.gCost[a]!.compareTo(newState.gCost[b]!));
  newState.open.addAll(
    open.toList(),
  );

  return newState;
}