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| from gym_minigrid.minigrid import Ball | |
| from gym_minigrid.roomgrid import RoomGrid | |
| from gym_minigrid.register import register | |
| class BlockedUnlockPickup(RoomGrid): | |
| """ | |
| Unlock a door blocked by a ball, then pick up a box | |
| in another room | |
| """ | |
| def __init__(self, seed=None): | |
| room_size = 6 | |
| super().__init__( | |
| num_rows=1, | |
| num_cols=2, | |
| room_size=room_size, | |
| max_steps=16*room_size**2, | |
| seed=seed | |
| ) | |
| def _gen_grid(self, width, height): | |
| super()._gen_grid(width, height) | |
| # Add a box to the room on the right | |
| obj, _ = self.add_object(1, 0, kind="box") | |
| # Make sure the two rooms are directly connected by a locked door | |
| door, pos = self.add_door(0, 0, 0, locked=True) | |
| # Block the door with a ball | |
| color = self._rand_color() | |
| self.grid.set(pos[0]-1, pos[1], Ball(color)) | |
| # Add a key to unlock the door | |
| self.add_object(0, 0, 'key', door.color) | |
| self.place_agent(0, 0) | |
| self.obj = obj | |
| self.mission = "pick up the %s %s" % (obj.color, obj.type) | |
| def step(self, action): | |
| obs, reward, done, info = super().step(action) | |
| if action == self.actions.pickup: | |
| if self.carrying and self.carrying == self.obj: | |
| reward = self._reward() | |
| done = True | |
| return obs, reward, done, info | |
| register( | |
| id='MiniGrid-BlockedUnlockPickup-v0', | |
| entry_point='gym_minigrid.envs:BlockedUnlockPickup' | |
| ) | |