fix planting chomper at the wrong grid

source/component/plant.py

@@ -115,7 +115,7 @@ class Plant(pg.sprite.Sprite):
         self.frame_num = len(self.frames)
         self.image = self.frames[self.frame_index]
         self.rect = self.image.get_rect()
-        self.rect.x = x
+        self.rect.centerx = x
         self.rect.bottom = y
         
         self.name = name

source/state/level.py

@@ -202,7 +202,7 @@ class Level(tool.State):
 
         if self.hint_image is None:
             self.setupHintImage()
-        x, y = self.hint_rect.x, self.hint_rect.bottom
+        x, y = self.hint_rect.centerx, self.hint_rect.bottom
         map_x, map_y = self.map.getMapIndex(x, y)
         if self.plant_name == c.SUNFLOWER:
             new_plant = plant.SunFlower(x, y, self.sun_group)