Update.

[picoclvr.git] / maze.py

diff --git a/maze.py b/maze.py
index 8ac9fce..d5662f0 100755 (executable)
--- a/maze.py
+++ b/maze.py
@@ -15,11 +15,11 @@ v_empty, v_wall, v_start, v_goal, v_path = 0, 1, 2, 3, 4
 def create_maze(h=11, w=17, nb_walls=8):
     assert h % 2 == 1 and w % 2 == 1
 
-    a, k = 0, 0
+    nb_attempts, nb_added_walls = 0, 0
 
-    while k < nb_walls:
+    while nb_added_walls < nb_walls:
         while True:
-            if a == 0:
+            if nb_attempts == 0:
                 m = torch.zeros(h, w, dtype=torch.int64)
                 m[0, :] = 1
                 m[-1, :] = 1
@@ -29,6 +29,7 @@ def create_maze(h=11, w=17, nb_walls=8):
             r = torch.rand(4)
 
             if r[0] <= 0.5:
+                # Add a vertical wall
                 i1, i2, j = (
                     int((r[1] * h).item()),
                     int((r[2] * h).item()),
@@ -36,10 +37,14 @@ def create_maze(h=11, w=17, nb_walls=8):
                 )
                 i1, i2, j = i1 - i1 % 2, i2 - i2 % 2, j - j % 2
                 i1, i2 = min(i1, i2), max(i1, i2)
+
+                # If this wall does not hit another one, add it
                 if i2 - i1 > 1 and i2 - i1 <= h / 2 and m[i1 : i2 + 1, j].sum() <= 1:
                     m[i1 : i2 + 1, j] = 1
                     break
+
             else:
+                # Add an horizontal wall
                 i, j1, j2 = (
                     int((r[1] * h).item()),
                     int((r[2] * w).item()),
@@ -47,15 +52,18 @@ def create_maze(h=11, w=17, nb_walls=8):
                 )
                 i, j1, j2 = i - i % 2, j1 - j1 % 2, j2 - j2 % 2
                 j1, j2 = min(j1, j2), max(j1, j2)
+
+                # If this wall does not hit another one, add it
                 if j2 - j1 > 1 and j2 - j1 <= w / 2 and m[i, j1 : j2 + 1].sum() <= 1:
                     m[i, j1 : j2 + 1] = 1
                     break
-            a += 1
 
-            if a > 10 * nb_walls:
-                a, k = 0, 0
+            nb_attempts += 1
+
+            if nb_attempts > 10 * nb_walls:
+                nb_attempts, nb_added_walls = 0, 0
 
-        k += 1
+        nb_added_walls += 1
 
     return m