bullet.py

import pygame
from sys import exit
import math
from settings import *

class Bullet(pygame.sprite.Sprite):
    def __init__(self, x, y, angle, enemy_group, player):
        super().__init__()
        self.image = pygame.image.load("assets/1.png").convert_alpha()
        self.image = pygame.transform.rotozoom(self.image, 0, BULLET_SCALE)
        self.rect = self.image.get_rect()
        self.rect.center = (x, y)
        self.x = x
        self.y = y
        self.angle = angle
        self.speed = BULLET_SPEED
        self.x_vel = math.cos(self.angle * (2*math.pi/360)) * self.speed
        self.y_vel = math.sin(self.angle * (2*math.pi/360)) * self.speed
        self.bullet_lifetime = BULLET_LIFETIME
        self.spawn_time = pygame.time.get_ticks()  # gets the specific time that the bullet was created
        self.enemy_group = enemy_group  # Group of enemies
        self.kills = 0
        self.player = player


    def bullet_movement(self):  
        self.x += self.x_vel
        self.y += self.y_vel

        self.rect.x = int(self.x)
        self.rect.y = int(self.y)

        if pygame.time.get_ticks() - self.spawn_time > self.bullet_lifetime:
            self.kill() 

    def update(self):
        self.bullet_movement()
        hit_enemies = pygame.sprite.spritecollide(self, self.enemy_group, False)
        if hit_enemies:
            for enemy in hit_enemies:
                if enemy.alive: 
                    enemy.alive = False
                    enemy.score -= DEATH_PENALTY
                    self.kills += 1
                    self.player.kills += 1
                    self.player.score += KILL_REWARD