Set AStarGrid2D path as unidirectional

[ssaenger]

Why doesn't AStarGrid2D have a method to set a path between two cells as unidirectional? This seems possible in AStar2D, but why not AStarGrid2D? Looking at the a_star_grid_2d source code, it does have logic to check for a path in all directions, so it seems doable to add a new check to check if a direction is allowed that the user can set. A new method could be created to set a direction as unidirectional:

bool set_point_direction(from_id: Vector2i, to_id: Vector2i)

[ssaenger]

@Chaosus I see you are a major contributor to AStarGrid2D. Could you enlighten me if there is a limitation with setting a path between two points as a unidirectional path. Is this possible? I appreciate it.

[Chaosus]

@ssaenger I think there is no limitation for this. In fact, I prepared a branch for this: https://github.com/Chaosus/godot/tree/astargrid_portals. I didn't create a PR since there is no much interest from the community.

The only hard part with this is a "jump" function support, which should work correctly with these "portals".

[ssaenger]

Oh this is perfect! It does more than what I was seeking. These portals provide a functionality that is just not possible with the current AStarGrid2D. I have interest in this.