Делаю физический движок

tank.py

@@ -5,16 +5,17 @@ from bonus import Bonus
 
 class Tank():
   ls = list()
-  def __init__(self,x,y,type='enemy'):
+  def __init__(self,x,y,type='enemy',max_health=100,speed = 5):
     self.sp_body = arcade.SpriteList()
     self.sp_gun = arcade.SpriteList()
     self.type = type
     self.x = x
     self.y = y
     self.gun_angle = 0
-    self.speed = 5
-    self.health = 100
-    self.max_health = 100
+    self.speed = speed
+    self.max_health = max_health
+    self.health = self.max_health
+    self.power = 10
     if type == 'player':
       body = arcade.Sprite(
         './assets/tankBody_blue.png',
@@ -43,6 +44,8 @@ class Tank():
     self.sp_gun.append(gun)
     
     Tank.ls.append(self)
+  def get_sprite(self):
+    return self.sp_body[0]
   def gun_to_xy(self,x,y):
     for gun in self.sp_gun:
       gun.angle = math.atan2(x-gun.center_x,y-gun.center_y) * 180 / math.pi
@@ -53,15 +56,17 @@ class Tank():
       if dx != 0 or dy != 0:
         body.angle = math.atan2(dx,dy) * 180 / math.pi
     for gun in self.sp_gun:
-      gun.change_x = dx*self.speed
-      gun.change_y = dy*self.speed
+      gun.change_x = self.sp_body[0].change_x
+      gun.change_y = self.sp_body[0].change_y
   def shoot(self):
     for gun in self.sp_gun:
       Bullet(
         gun.center_x,
         gun.center_y,
         gun.angle,
-        shift = 50
+        shift = 20+self.power*0.6,
+        power = self.power,
+        owner=self
         )
   def destroy(self):
     Tank.ls.remove(self)
@@ -77,17 +82,17 @@ class Tank():
       for bonus in colls:
         if bonus.type == 'star':
             for gun in tank.sp_gun:
-              if gun.cur > len(gun.textures):
-                gun.cur = 0
-                gun.set_texture(gun.cur)
-              else:
+              if gun.cur < len(gun.textures)-1:
                 gun.cur += 1
                 gun.set_texture(gun.cur)
+                tank.power *= 2
         bonus.destroy()
       #Столкновения с пулями
       colls = Bullet.get_colls(tank.sp_body[0])
       for bullet in colls:
-        tank.health -= 10
+        if tank == bullet.owner:
+          continue
+        tank.health -= bullet.power
         bullet.destroy()
         if tank.health <= 0:
             tank.destroy()