#Image Variables
bg = 'bg.jpg'
bunk = 'bunker.png'
enemytank = 'enemy-tank.png'

#Import Pygame Modules
import pygame, sys
from pygame.locals import *

#Initializing the Screen
pygame.init()
screen = pygame.display.set_mode((640,360), 0, 32)

background = pygame.image.load(bg).convert()



bunker_x, bunker_y = (160,0)



class EnemyTank(pygame.sprite.Sprite):
    e_tank = pygame.image.load(enemytank).convert_alpha()
    def __init__(self, startpos):
        pygame.sprite.Sprite.__init__(self, self.groups)
        self.pos = startpos
        self.image = EnemyTank.image
        self.rect = self.image.get_rect()
    def update(self):
        self.rect.center = self.pos

class Bunker(pygame.sprite.Sprite):
    bunker = pygame.image.load(bunk).convert_alpha()
    def __init__(self, startpos):
        pygame.spriter.Sprite.__init__(self, self.groups)
        self.pos = startpos
        self.image = Bunker.image
        self.rect = self.image.get_rect()
    def getCollisionObjects(self, EnemyTank):
        if (EnemyTank not in self._allgroup, False):
            return False
        self._allgroup.remove(EnemyTank)
        result = pygame.sprite.spritecollide(EnemyTank, self._allgroup, False)
        self._allgroup.add(EnemyTank)
    def update(self):
        self.rect.center = self.pos


#Setting Up The Animation
x = 0
clock = pygame.time.Clock()
speed = 250

allgroup = pygame.sprite.Group()
EnemyTank = allgroup
Bunker = allgroup

e_tank = EnemyTank()
bunker = Bunker()5

#Main Loop
while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    screen.blit(background, (0,0))
    screen.blit(bunker, (bunker_x, bunker_y))
    screen.blit(e_tank, (x, 0))
    pygame.display.flip()

    #Animation
    milli = clock.tick()
    seconds = milli/1000.
    dm = seconds*speed
    x += dm

    if x>640:
        x=0


    #Update the Screen
    pygame.display.update()