def create_hearts(num_of_hearts):
global hearts
reset_hearts()
for i in range(num_of_hearts):
heart = Object("images/heart.png", STARTINGXPOS -
XDISTACEBETWEENHEARTS * i, STARTINGYPOS)
hearts.append(heart)
def create_powerup():
random_powerup_index = random.randint(0, len(powerup_types) - 1)
random_powerup_type = powerup_types[random_powerup_index]
random_x = random.random() * WINDOWSWIDTH - 64
if random_powerup_type == "heart":
heart = Object("images/heart.png", x=random_x, y=0, scale=1.5)
powerups.append(heart)
engine.on_collision(heart, player, heart_player_colllision)
elif random_powerup_type == "ammo":
ammo = Object("images/ammo.png", x=random_x, y=0, scale=1.5)
powerups.append(ammo)
engine.on_collision(obj_1=ammo, obj_2=player,
handler=ammo_player_collision)
elif random_powerup_type == "speed":
speed = Object("images/speed.png", x=random_x, y=0, scale=1.5)
powerups.append(speed)
engine.on_collision(speed, player, speed_player_collision)
create_powerup_timer()
def fire_bullet():
global can_shoot
if can_shoot or ammo_collected:
bullet = Object("Images/bullet.png", player.pos_x +
16, player.pos_y - 32, scale=SCALEFACTOR)
bullets.append(bullet)
laser_sound = Audio("audio/laser.wav", False, True, 0.15)
for enemy in enemies:
engine.on_collision(bullet, enemy, bullet_enemy_collision)
can_shoot = False
engine.add_timer(0.5, set_can_shoot_to_true)
def spawn_enemies():
columns_of_enemies = (int(COLLUMNS * columns_of_enemies_multiplier))
if columns_of_enemies > MAXCOLUMNS_O_ENEMIES:
columns_of_enemies = MAXCOLUMNS_O_ENEMIES
rows_of_enemies = (int(ROWS * rows_of_enemies_multiplier))
if rows_of_enemies > MAXROWS_O_ENEMIES:
rows_of_enemies = MAXROWS_O_ENEMIES
for row in range(rows_of_enemies):
for column in range(columns_of_enemies):
enemy = Object("images/ufo.png", FIRSTENEMYXPOS +
column * XDISTANCEBETWEENENEMIES, FIRSTENEMYYPOS + row * YDISTANCEBETWEENENEMIES, scale=SCALEFACTOR)
enemies.append(enemy)
set_timer_to_drop_bomb(enemy)
engine.on_collision(player, enemy, player_enemy_collision)
def start_game():
global player, score_text, username
space_invaders_text.destroy()
play_button.destroy()
username = username_input_box.text
username_input_box.destroy()
engine.set_background("images/background.png")
background_music = Audio("audio/background.wav", True, True, 0.15)
player = Object("images/spaceship.png", 400-32, 450, 0.5)
create_hearts(STARTINGNUMOFHEARTS)
score_text = Text("Score: " + str(score))
engine.on_key_pressed(pygame.K_SPACE, fire_bullet)
engine.on_key_down(pygame.K_a, move_left)
engine.on_key_down(pygame.K_d, move_right)
create_powerup_timer()
spawn_enemies()
def drop_bomb(enemy):
if not enemy.destroyed:
bomb = Object("images/bomb.png", enemy.pos_x, enemy.pos_y)
bombs.append(bomb)
engine.on_collision(bomb, player, bomb_player_collision)
set_timer_to_drop_bomb(enemy)
def set_background(self, background_path):
if self.background is not None:
self.background.destroy()
self.background = Object(background_path, 0, 0, 1.0, 0.0, False, None,
100)