From 7fa0403a2887309d42a5ccbaef678f379ccd1c49 Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Thu, 24 Jul 2025 00:48:51 -0400
Subject: [PATCH] Pulling the pathing code out into a separate module is
 better.

---
 phase_13/ecs.py     | 42 ++----------------------------------------
 phase_13/pathing.py | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 40 deletions(-)
 create mode 100644 phase_13/pathing.py

diff --git a/phase_13/ecs.py b/phase_13/ecs.py
index c1c8386..39d56d4 100644
--- a/phase_13/ecs.py
+++ b/phase_13/ecs.py
@@ -1,5 +1,6 @@
 import utils
 import numpy as np
+import pathing
 
 class Player:
     def __init__(self, x, y):
@@ -48,50 +49,11 @@ class Systems:
         self.width = self.map.width
         self.paths = np.full((self.height, self.width), utils.PATH_LIMIT, dtype=int)
 
-    def add_neighbors(self, neighbors, closed, near_y, near_x):
-        points = utils.compass(near_x, near_y)
-
-        for x,y in points:
-            if self.map.inbounds(x,y) and closed[y, x] == utils.SPACE:
-                closed[y, x] = utils.WALL
-                neighbors.append([x,y])
-
-    def path_enemies(self, in_grid):
-        self.paths.fill(utils.PATH_LIMIT)
-        closed = self.map.map.copy()
-        starting_pixels = []
-        open_pixels = []
-
-        counter = 0
-        while counter < self.height * self.width:
-            x = counter % self.width
-            y = counter // self.width
-            if in_grid[y, x] == 0:
-                self.paths[y, x] = 0
-                closed[y, x] = utils.WALL
-                starting_pixels.append([x,y])
-            counter += 1
-
-        for x, y in starting_pixels:
-            self.add_neighbors(open_pixels, closed, y, x)
-
-        counter = 1
-        while counter < utils.PATH_LIMIT and open_pixels:
-            next_open = []
-            for x,y in open_pixels:
-                self.paths[y, x] = counter
-                self.add_neighbors(next_open, closed, y, x)
-            open_pixels = next_open
-            counter += 1
-
-        for x, y in open_pixels:
-            self.paths[y, x] = counter
-
     def move_enemies(self):
         in_grid = np.full((self.map.height, self.map.width), 1, dtype=int)
         in_grid[self.player.y, self.player.x] = 0
 
-        self.path_enemies(in_grid)
+        pathing.calculate_paths(self.map, self.paths, in_grid)
         # for every enemy (actors[0] is player)
         for enemy in self.actors[1:]:
             nearby = utils.compass(enemy.x, enemy.y)
diff --git a/phase_13/pathing.py b/phase_13/pathing.py
new file mode 100644
index 0000000..9b15181
--- /dev/null
+++ b/phase_13/pathing.py
@@ -0,0 +1,41 @@
+import utils
+
+def add_neighbors(the_map, neighbors, closed, near_y, near_x):
+    points = utils.compass(near_x, near_y)
+
+    for x,y in points:
+        if the_map.inbounds(x,y) and closed[y, x] == utils.SPACE:
+            closed[y, x] = utils.WALL
+            neighbors.append([x,y])
+
+def calculate_paths(the_map, paths, in_grid):
+    height, width = paths.shape
+    paths.fill(utils.PATH_LIMIT)
+    closed = the_map.map.copy()
+    starting_pixels = []
+    open_pixels = []
+
+    counter = 0
+    while counter < height * width:
+        x = counter % width
+        y = counter // width
+        if in_grid[y, x] == 0:
+            paths[y, x] = 0
+            closed[y, x] = utils.WALL
+            starting_pixels.append([x,y])
+        counter += 1
+
+    for x, y in starting_pixels:
+        add_neighbors(the_map, open_pixels, closed, y, x)
+
+    counter = 1
+    while counter < utils.PATH_LIMIT and open_pixels:
+        next_open = []
+        for x,y in open_pixels:
+            paths[y, x] = counter
+            add_neighbors(the_map, next_open, closed, y, x)
+        open_pixels = next_open
+        counter += 1
+
+    for x, y in open_pixels:
+        paths[y, x] = counter