Add the Player class and the Up key binding

Task: MIL-003#1
Task: MIL-003#2
Task: MIL-003#3

src/main.py

@@ -1,27 +1,31 @@
-"""@file main.py
-@brief Entry point: sets up the screen and runs the game loop.
-"""
-
-import time
-from turtle import Screen
-
-from car_manager import CarManager
-from constants import LOOP_DELAY, SCREEN_HEIGHT, SCREEN_WIDTH
-from player import Player
-from scoreboard import Scoreboard
-
-
-def main() -> None:
-    """@brief Run the game until the player is hit by a car."""
-    screen = Screen()
-    screen.setup(width=SCREEN_WIDTH, height=SCREEN_HEIGHT)
-    screen.tracer(0)
-
-    game_is_on = True
-    while game_is_on:
-        time.sleep(LOOP_DELAY)
-        screen.update()
-
-
-if __name__ == "__main__":
-    main()
+"""@file main.py
+@brief Entry point: sets up the screen and runs the game loop.
+"""
+
+import time
+from turtle import Screen
+
+from car_manager import CarManager
+from constants import LOOP_DELAY, SCREEN_HEIGHT, SCREEN_WIDTH
+from player import Player
+from scoreboard import Scoreboard
+
+
+def main() -> None:
+    """@brief Run the game until the player is hit by a car."""
+    screen = Screen()
+    screen.setup(width=SCREEN_WIDTH, height=SCREEN_HEIGHT)
+    screen.tracer(0)
+
+    player = Player()
+    screen.listen()
+    screen.onkey(player.go_up, "Up")
+
+    game_is_on = True
+    while game_is_on:
+        time.sleep(LOOP_DELAY)
+        screen.update()
+
+
+if __name__ == "__main__":
+    main()

src/player.py

@@ -2,6 +2,21 @@
 @brief The turtle the user controls.
 """
 
+from turtle import Turtle
 
-class Player:
-    """@brief Placeholder, implemented in milestone MIL-003."""
+from constants import MOVE_DISTANCE, STARTING_POSITION
+
+
+class Player(Turtle):
+    """@brief The turtle that crosses the road; it can only move forward (north)."""
+
+    def __init__(self) -> None:
+        """@brief Create the player at the starting position, facing north."""
+        super().__init__(shape="turtle")
+        self.penup()
+        self.setheading(90)
+        self.goto(STARTING_POSITION)
+
+    def go_up(self) -> None:
+        """@brief Move one step north."""
+        self.forward(MOVE_DISTANCE)