#simple enemy class

import pygame, pygame.image
from pygame.locals import *

import gfx, game

images = []

def load_game_resources():
    #load shot graphics
    global images
    for i in range(1,5):
        img = gfx.load('bullet.gif')
        images.append(img)
    

class Shot:
    def __init__(self, pos, move):
        self.move = move
        self.image = images[0]
        self.rect = self.image.get_rect()
        self.rect.center = pos
        self.lastrect = None
        self.dead = 0
        self.pos = list(self.rect.topleft)

    def prep(self, screen):
        pass

    def erase(self, background):
        if self.lastrect:
            background(self.lastrect)
            if self.dead:
                gfx.dirty(self.lastrect)
                self.lastrect = None

    def draw(self, gfx):
        r = gfx.surface.blit(self.image, self.rect)            
        gfx.dirty2(r, self.lastrect)
        self.lastrect = r

    def tick(self, speedadjust = 1.0):
        self.pos[0] += self.move[0] * speedadjust
        self.pos[1] += self.move[1] * speedadjust
        self.rect.topleft = self.pos
        if not gfx.rect.colliderect(self.rect):
            self.dead = 1
        return self.dead