Change the font to courier

Author: yanfengliu

PROGRESS.md

@@ -53,3 +53,4 @@
 - Kept unlock milestone economics by using incremental line purchase prices derived from `[0, 90, 300, 650]`.
 - Added locked-button hover buy hints with two lines of text (`Buy` and price), using gray text when unaffordable and black text when affordable.
 - Updated game rules docs for purchase-based line unlocks and the new locked-button hover/click behavior.
+- Changed UI font usage to `courier` via shared `font_name` config.

src/config.py

@@ -84,6 +84,7 @@
 path_button_buy_text_font_size = 26
 
 # text
+font_name = "courier"
 score_font_size = 50
 score_display_coords = (20, 20)
 game_over_font_size = 120

src/mediator.py

@@ -5,6 +5,7 @@
 
 import pygame
 from config import (
+    font_name,
     max_waiting_passengers,
     initial_num_stations,
     num_metros,
@@ -71,10 +72,10 @@ def __init__(self) -> None:
         self.path_buttons = get_path_buttons(self.num_paths)
         self.path_to_button: Dict[Path, PathButton] = {}
         self.buttons = [*self.path_buttons]
-        self.font = pygame.font.SysFont("arial", score_font_size)
-        self.game_over_font = pygame.font.SysFont("arial", game_over_font_size)
+        self.font = pygame.font.SysFont(font_name, score_font_size)
+        self.game_over_font = pygame.font.SysFont(font_name, game_over_font_size)
         self.game_over_hint_font = pygame.font.SysFont(
-            "arial", game_over_hint_font_size
+            font_name, game_over_hint_font_size
         )
         self.game_over_restart_rect: pygame.Rect | None = None
         self.game_over_exit_rect: pygame.Rect | None = None

src/ui/path_button.py

@@ -4,6 +4,7 @@
 from config import (
     button_color,
     button_size,
+    font_name,
     path_button_buffer,
     path_button_buy_text_color,
     path_button_buy_text_disabled_color,
@@ -110,7 +111,7 @@ def draw(
             if self.show_cross and locked_purchase_price is not None:
                 if self.buy_text_font is None:
                     self.buy_text_font = pygame.font.SysFont(
-                        "arial", path_button_buy_text_font_size
+                        font_name, path_button_buy_text_font_size
                     )
                 text_color = (
                     path_button_buy_text_color