feat(tractor): implement tank controls

src/tractor.py

@@ -25,19 +25,19 @@ class Tractor(pygame.sprite.Sprite):
         surface.blit(self.image, self.rect)
 
 
-    def move(self, direction):
-        if direction == "up" and self.rect.y > 0:
+    def move(self):
+        if self.direction == "north" and self.rect.y > 0:
             self.rect.y -= TILE_SIZE
             self.log_info()
-        elif direction == "down" and self.rect.y < 15 * TILE_SIZE:
+        elif self.direction == "south" and self.rect.y < 15 * TILE_SIZE:
             self.rect.y += TILE_SIZE
             self.log_info()
-        elif direction == "left" and self.rect.x > 0:
+        elif self.direction == "west" and self.rect.x > 0:
             self.rect.x -= TILE_SIZE
             self.log_info()
-        elif direction == "right" and self.rect.x < 15 * TILE_SIZE:
+        elif self.direction == "east" and self.rect.x < 15 * TILE_SIZE:
             self.rect.x += TILE_SIZE
-            self.log_info()        
+            self.log_info()
 
 
     def update(self):
@@ -47,9 +47,7 @@ class Tractor(pygame.sprite.Sprite):
         if keys[pygame.K_RIGHT]:
             self.rotate('right')
         if keys[pygame.K_UP]:
-            self.move('up')
-        if keys[pygame.K_DOWN]:
-            self.move('down')
+            self.move()
         if keys[pygame.K_r]:
             self.water = 50
             print(f"💧 replenished water level: {self.water} litres\n")