revamp GridRoomsUndirected and GridRoomsDirected (#154)

* add GridRoomsUndirectedModule.GridRoomsUndirected

* add GridRoomsDirectedModule.GridRoomsDirected

* remove old GridRoomsUndirected & GridRoomsDirected

* fix getting started in README

* fix door placing in GridRoomsUndirected

* forward show method for RLBaseGridWorld to inner env

* change MIME("text/plain") to MIME"text/plain"()

* forward play! methods for RLBaseGridWorld to inner env

* rename RLBaseGridWorld to RLBaseEnv

* update README

README.md

@@ -14,6 +14,8 @@ This package is inspired by [gym-minigrid](https://github.com/maximecb/gym-minig
 [List of Environments](#list-of-environments)
 1. [SingleRoomUndirected](#singleroomundirected)
 1. [SingleRoomDirected](#singleroomdirected)
+1. [GridRoomsUndirected](#gridroomsundirected)
+1. [GridRoomsDirected](#gridroomsdirected)
 
 ## Getting Started
 
@@ -34,7 +36,7 @@ GW.Play.play!(env, file_name = "recording.txt")
 
 # replay the recording inside the terminal at given frame rate
 
-GW.Play.repay("recording.txt", frame_rate = 2)
+GW.Play.replay("recording.txt", frame_rate = 2)
 
 # manually step through the recording
 
@@ -44,16 +46,18 @@ GW.Play.replay("recording.txt", frame_rate = nothing)
 
 import ReinforcementLearningBase as RLBase
 
-RLBase.reset!(env)
-RLBase.state(env)
-RLBase.action_space(env)
-RLBase.reward(env)
-RLBase.is_terminated(env)
+rlbase_env = GW.RLBaseEnvModule.RLBaseEnv(env)
 
-env(1) # move up
-env(2) # move down
-env(3) # move left
-env(4) # move right
+RLBase.reset!(rlbase_env)
+RLBase.state(rlbase_env)
+RLBase.action_space(rlbase_env)
+RLBase.reward(rlbase_env)
+RLBase.is_terminated(rlbase_env)
+
+rlbase_env(1) # move up
+rlbase_env(2) # move down
+rlbase_env(3) # move left
+rlbase_env(4) # move right
 ```
 
 ## Playing and Recording
@@ -75,3 +79,11 @@ Here is an example:
 1. ### SingleRoomDirected
 
     <img src="https://user-images.githubusercontent.com/32610387/124130952-efed6d00-da9c-11eb-84fa-0caf856a2580.gif">
+
+1. ### GridRoomsUndirected
+
+    <img src="https://user-images.githubusercontent.com/32610387/124348535-1d0a5e80-dc08-11eb-9cfb-7c5f40e9c5c9.gif">
+
+1. ### GridRoomsDirected
+
+    <img src="https://user-images.githubusercontent.com/32610387/124348551-298eb700-dc08-11eb-835a-ee4b80a5b1b4.gif">

src/envs/envs.jl

@@ -29,6 +29,23 @@ function place_room!(world::GridWorldBase, room::Room)
     world[WALL, top:bottom, right] .= true
 end
 
+function sample_empty_position(rng, tile_map, max_tries = 1024)
+    _, height, width = size(tile_map)
+    position = CartesianIndex(rand(rng, 1:height), rand(rng, 1:width))
+
+    for i in 1:1000
+        if any(@view tile_map[:, position])
+            position = CartesianIndex(rand(rng, 1:height), rand(rng, 1:width))
+        else
+            return position
+        end
+    end
+
+    @warn "Returning non-empty position: $(position)"
+
+    return position
+end
+
 function sample_two_positions_without_replacement(rng, region)
     position1 = rand(rng, region)
     position2 = rand(rng, region)
@@ -40,7 +57,6 @@ function sample_two_positions_without_replacement(rng, region)
     return position1, position2
 end
 
-include("grid_rooms.jl")
 include("sequential_rooms.jl")
 include("maze.jl")
 include("go_to_target.jl")
@@ -54,3 +70,5 @@ include("transport.jl")
 include("collect_gems_undirected_multi_agent.jl")
 include("single_room_undirected.jl")
 include("single_room_directed.jl")
+include("grid_rooms_undirected.jl")
+include("grid_rooms_directed.jl")