lint: ruff-clean testbed (blocking file write to thread, unused vars)

testbed/room/render.py

@@ -13,7 +13,7 @@ import math
 
 from PIL import Image
 
-from testbed.room.world import ROOM_HEIGHT, ROOM_SIZE, Box, Room
+from testbed.room.world import ROOM_HEIGHT, ROOM_SIZE, Room
 
 # Palette
 FOG = (14, 14, 20)
@@ -83,10 +83,10 @@ class Raycaster:
 
             row_top = self._row_of(ROOM_HEIGHT, t_wall, eye, tan_pitch)
             row_bot = self._row_of(0.0, t_wall, eye, tan_pitch)
-            r_top = max(0, int(math.ceil(min(row_top, row_bot))))
-            r_bot = min(h, int(math.floor(max(row_top, row_bot))))
+            r_top = max(0, math.ceil(min(row_top, row_bot)))
+            r_bot = min(h, math.floor(max(row_top, row_bot)))
 
-            base = c * 3
+            c * 3
             for r in range(h):
                 v = self.tan_fy * (1.0 - 2.0 * (r + 0.5) / h)
                 down = v + tan_pitch
@@ -252,7 +252,7 @@ class Raycaster:
         return _fog(col, dist)
 
     def _shade_floor(self, wx: float, wz: float, t: float) -> tuple[int, int, int]:
-        cell = int(math.floor(wx)) + int(math.floor(wz))
+        cell = math.floor(wx) + math.floor(wz)
         col = FLOOR_A if cell % 2 == 0 else FLOOR_B
         fx = wx - math.floor(wx)
         fz = wz - math.floor(wz)
@@ -285,8 +285,7 @@ class Raycaster:
         vv = (b.height - eye) / along - tan_pitch
         row_c = (1.0 - vv / self.tan_fy) / 2.0 * h
         r_px = b.radius / along / self.tan_fx * w / 2.0
-        if r_px < 1.2:
-            r_px = 1.2
+        r_px = max(r_px, 1.2)
         glow = r_px * 3.4
 
         pulse = 1.0