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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from gym_minigrid.minigrid import *
from gym_minigrid.register import register
class FourRoomsEnv(MiniGridEnv):
"""
Classic 4 rooms gridworld environment.
Can specify agent and goal position, if not it set at random.
"""
def __init__(self, agent_pos=None, goal_pos=None):
self._agent_default_pos = agent_pos
self._goal_default_pos = goal_pos
super().__init__(grid_size=19, max_steps=100)
def _gen_grid(self, width, height):
# Create the grid
self.grid = Grid(width, height)
# Generate the surrounding walls
self.grid.horz_wall(0, 0)
self.grid.horz_wall(0, height - 1)
self.grid.vert_wall(0, 0)
self.grid.vert_wall(width - 1, 0)
room_w = width // 2
room_h = height // 2
# For each row of rooms
for j in range(0, 2):
# For each column
for i in range(0, 2):
xL = i * room_w
yT = j * room_h
xR = xL + room_w
yB = yT + room_h
# Bottom wall and door
if i + 1 < 2:
self.grid.vert_wall(xR, yT, room_h)
pos = (xR, self._rand_int(yT + 1, yB))
self.grid.set(*pos, None)
# Bottom wall and door
if j + 1 < 2:
self.grid.horz_wall(xL, yB, room_w)
pos = (self._rand_int(xL + 1, xR), yB)
self.grid.set(*pos, None)
# Randomize the player start position and orientation
if self._agent_default_pos is not None:
self.agent_pos = self._agent_default_pos
self.grid.set(*self._agent_default_pos, None)
self.agent_dir = self._rand_int(0, 4) # assuming random start direction
else:
self.place_agent()
if self._goal_default_pos is not None:
goal = Goal()
self.put_obj(goal, *self._goal_default_pos)
goal.init_pos, goal.cur_pos = self._goal_default_pos
else:
self.place_obj(Goal())
self.mission = 'Reach the goal'
def step(self, action):
obs, reward, done, info = MiniGridEnv.step(self, action)
return obs, reward, done, info
register(
id='MiniGrid-FourRooms-v0',
entry_point='gym_minigrid.envs:FourRoomsEnv'
)
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