feat: add connected indicator on car

src/camera.py

@@ -45,3 +45,6 @@ class Camera:
         screen_delta: Vec = Vec(dx, dy) * self.zoom * self.UNIT_RATIO
         screen_pos: Vec = self.car_screen_pos + screen_delta
         return screen_pos
+
+    def size2screen(self, size: float) -> float:
+        return size * self.zoom * self.UNIT_RATIO

src/car.py

@@ -16,6 +16,7 @@ class Car:
     MAX_BACK_SPEED = -3
     ROTATE_SPEED = 1
     COLOR = (230, 150, 80)
+    CTRL_COLOR = (80, 230, 150)
     WIDTH = 0.4
     LENGTH = 0.6
     COLLISION_MARGIN = 0.4
@@ -82,6 +83,14 @@ class Car:
         pts = [camera.world2screen(p) for p in pts]
         pygame.draw.polygon(surf, self.COLOR, pts)
 
+        if self.controller.is_connected:
+            pygame.draw.circle(
+                surf,
+                self.CTRL_COLOR,
+                camera.world2screen(self.pos),
+                camera.size2screen(self.WIDTH / 4),
+            )
+
     def get_corners(self) -> list[Vec]:
         u: Vec = self.direction * self.LENGTH / 2
         v: Vec = self.direction.perp * self.WIDTH / 2

src/remote_controller.py

@@ -35,6 +35,10 @@ class RemoteController:
         self.client_thread: Optional[threading.Thread] = None
         self.client: Optional[socket.socket] = None
 
+    @property
+    def is_connected(self) -> bool:
+        return self.client is not None
+
     def wait_for_connections(self):
         self.server.bind(("", self.port))
         self.server.listen(1)