car can turn

main.py

@@ -41,7 +41,8 @@ class Car(pygame.sprite.Sprite):
     def update_position(self):
         vec = angle_to_vector(self.heading)
         old_center = self.rect.center
-        self.rect.center = (self.speed * vec[0] + old_center[0], self.speed * vec[1] + old_center[1])
+        self.rect.center = (self.speed * vec[0] + old_center[0], -self.speed * vec[1] + old_center[1])
+        # print(self.rect.center)
 
     def update(self):
 
@@ -50,21 +51,23 @@ class Car(pygame.sprite.Sprite):
         self.image = pygame.transform.rotate(self.original_image, self.heading)
         self.rect = self.image.get_rect()
         self.rect.center = old_center
-        # self.update_position()
+        self.update_position()
 
         self.heading += self.heading_change
         self.heading = self.heading % 360
         # self.rect = self.image.get_rect(center=self.rect.center)
-        self.rect.x += self.speed
+        # self.rect.x += self.speed
 
 
 screen = pygame.display.set_mode((GX, GY), FLAGS)
 all_cars = pygame.sprite.Group()
-car = Car()
-all_cars.add(car)
+# car = Car()
+# car.heading = 0
+# all_cars.add(car)
 car2 = Car()
-car2.heading_change = 5
-car2.speed = -2
+car2.heading = 270
+car2.heading_change = 3
+car2.speed = 5
 all_cars.add(car2)