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aliens.py
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aliens.py
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#!/usr/bin/env python
""" pygame.examples.aliens
Shows a mini game where you have to defend against aliens.
What does it show you about pygame?
* pg.sprite, the difference between Sprite and Group.
* dirty rectangle optimization for processing for speed.
* music with pg.mixer.music, including fadeout
* sound effects with pg.Sound
* event processing, keyboard handling, QUIT handling.
* a main loop frame limited with a game clock from pg.time.Clock
* fullscreen switching.
Controls
--------
* Left and right arrows to move.
* Space bar to shoot
* f key to toggle between fullscreen.
"""
import random
import os
# import basic pygame modules
import pygame as pg
from telemetry import Telemetry
# see if we can load more than standard BMP
if not pg.image.get_extended():
raise SystemExit("Sorry, extended image module required")
# game constants
MAX_SHOTS = 2 # most player bullets onscreen
ALIEN_ODDS = 22 # chances a new alien appears
BOMB_ODDS = 60 # chances a new bomb will drop
ALIEN_RELOAD = 12 # frames between new aliens
SCREENRECT = pg.Rect(0, 0, 640, 480)
SCORE = 0
main_dir = os.path.split(os.path.abspath(__file__))[0]
def load_image(file):
""" loads an image, prepares it for play
"""
file = os.path.join(main_dir, "data", file)
try:
surface = pg.image.load(file)
except pg.error:
raise SystemExit('Could not load image "%s" %s' % (file, pg.get_error()))
return surface.convert()
def load_sound(file):
""" because pygame can be be compiled without mixer.
"""
if not pg.mixer:
return None
file = os.path.join(main_dir, "data", file)
try:
sound = pg.mixer.Sound(file)
return sound
except pg.error:
print("Warning, unable to load, %s" % file)
return None
# Each type of game object gets an init and an update function.
# The update function is called once per frame, and it is when each object should
# change it's current position and state.
#
# The Player object actually gets a "move" function instead of update,
# since it is passed extra information about the keyboard.
class Player(pg.sprite.Sprite):
""" Representing the player as a moon buggy type car.
"""
player_name = None
speed = 10
bounce = 24
gun_offset = -11
images = []
def __init__(self, player_name):
pg.sprite.Sprite.__init__(self, self.containers)
self.image = self.images[0]
self.rect = self.image.get_rect(midbottom=SCREENRECT.midbottom)
self.reloading = 0
self.origtop = self.rect.top
self.facing = -1
self.player_name = player_name
# @Telemetry.collect_telemetry_on_move
def move(self, direction):
if direction:
self.facing = direction
self.rect.move_ip(direction * self.speed, 0)
self.rect = self.rect.clamp(SCREENRECT)
if direction < 0:
self.image = self.images[0]
elif direction > 0:
self.image = self.images[1]
self.rect.top = self.origtop - (self.rect.left // self.bounce % 2)
def gunpos(self):
pos = self.facing * self.gun_offset + self.rect.centerx
return pos, self.rect.top
class Alien(pg.sprite.Sprite):
""" An alien space ship. That slowly moves down the screen.
"""
speed = 13
animcycle = 12
images = []
def __init__(self):
pg.sprite.Sprite.__init__(self, self.containers)
self.image = self.images[0]
self.rect = self.image.get_rect()
self.facing = random.choice((-1, 1)) * Alien.speed
self.frame = 0
if self.facing < 0:
self.rect.right = SCREENRECT.right
def update(self):
self.rect.move_ip(self.facing, 0)
if not SCREENRECT.contains(self.rect):
self.facing = -self.facing
self.rect.top = self.rect.bottom + 1
self.rect = self.rect.clamp(SCREENRECT)
self.frame = self.frame + 1
self.image = self.images[self.frame // self.animcycle % 3]
class Explosion(pg.sprite.Sprite):
""" An explosion. Hopefully the Alien and not the player!
"""
defaultlife = 12
animcycle = 3
images = []
def __init__(self, actor):
pg.sprite.Sprite.__init__(self, self.containers)
self.image = self.images[0]
self.rect = self.image.get_rect(center=actor.rect.center)
self.life = self.defaultlife
def update(self):
""" called every time around the game loop.
Show the explosion surface for 'defaultlife'.
Every game tick(update), we decrease the 'life'.
Also we animate the explosion.
"""
self.life = self.life - 1
self.image = self.images[self.life // self.animcycle % 2]
if self.life <= 0:
self.kill()
class Shot(pg.sprite.Sprite):
""" a bullet the Player sprite fires.
"""
speed = -11
images = []
@Telemetry.collect_telemetry_shot
def __init__(self, pos):
pg.sprite.Sprite.__init__(self, self.containers)
self.image = self.images[0]
self.rect = self.image.get_rect(midbottom=pos)
def update(self):
""" called every time around the game loop.
Every tick we move the shot upwards.
"""
self.rect.move_ip(0, self.speed)
if self.rect.top <= 0:
self.kill()
class Bomb(pg.sprite.Sprite):
""" A bomb the aliens drop.
"""
speed = 9
images = []
def __init__(self, alien):
pg.sprite.Sprite.__init__(self, self.containers)
self.image = self.images[0]
self.rect = self.image.get_rect(midbottom=alien.rect.move(0, 5).midbottom)
def update(self):
""" called every time around the game loop.
Every frame we move the sprite 'rect' down.
When it reaches the bottom we:
- make an explosion.
- remove the Bomb.
"""
self.rect.move_ip(0, self.speed)
if self.rect.bottom >= 470:
Explosion(self)
self.kill()
@Telemetry.collect_telemetry_kill
def kill(self):
super().kill()
class Score(pg.sprite.Sprite):
""" to keep track of the score.
"""
def __init__(self):
pg.sprite.Sprite.__init__(self)
self.font = pg.font.Font(None, 20)
self.font.set_italic(1)
self.color = pg.Color("white")
self.lastscore = -1
self.update()
self.rect = self.image.get_rect().move(10, 450)
def update(self):
""" We only update the score in update() when it has changed.
"""
if SCORE != self.lastscore:
self._update()
@Telemetry.collect_telemetry_score
def _update(self):
self.lastscore = SCORE
msg = "Score: %d" % SCORE
self.image = self.font.render(msg, 0, self.color)
def main(winstyle=0):
from gdpr_consents import gdpr_concents
player_name, consent = gdpr_concents()
Telemetry(player_name, consent)
# Initialize pygame
if pg.get_sdl_version()[0] == 2:
pg.mixer.pre_init(44100, 32, 2, 1024)
pg.init()
if pg.mixer and not pg.mixer.get_init():
print("Warning, no sound")
pg.mixer = None
pg.mixer = None
fullscreen = False
# Set the display mode
winstyle = 0 # |FULLSCREEN
bestdepth = pg.display.mode_ok(SCREENRECT.size, winstyle, 32)
screen = pg.display.set_mode(SCREENRECT.size, winstyle, bestdepth)
# Load images, assign to sprite classes
# (do this before the classes are used, after screen setup)
img = load_image("player1.gif")
Player.images = [img, pg.transform.flip(img, 1, 0)]
img = load_image("explosion1.gif")
Explosion.images = [img, pg.transform.flip(img, 1, 1)]
Alien.images = [load_image(im) for im in ("alien1.gif", "alien2.gif", "alien3.gif")]
Bomb.images = [load_image("bomb.gif")]
Shot.images = [load_image("shot.gif")]
# decorate the game window
icon = pg.transform.scale(Alien.images[0], (32, 32))
pg.display.set_icon(icon)
pg.display.set_caption("Pygame Aliens")
pg.mouse.set_visible(0)
# create the background, tile the bgd image
bgdtile = load_image("background.gif")
background = pg.Surface(SCREENRECT.size)
for x in range(0, SCREENRECT.width, bgdtile.get_width()):
background.blit(bgdtile, (x, 0))
screen.blit(background, (0, 0))
pg.display.flip()
# load the sound effects
boom_sound = load_sound("boom.wav")
shoot_sound = load_sound("car_door.wav")
if pg.mixer:
music = os.path.join(main_dir, "data", "house_lo.wav")
pg.mixer.music.load(music)
pg.mixer.music.play(-1)
# Initialize Game Groups
aliens = pg.sprite.Group()
shots = pg.sprite.Group()
bombs = pg.sprite.Group()
all = pg.sprite.RenderUpdates()
lastalien = pg.sprite.GroupSingle()
# assign default groups to each sprite class
Player.containers = all
Alien.containers = aliens, all, lastalien
Shot.containers = shots, all
Bomb.containers = bombs, all
Explosion.containers = all
Score.containers = all
# Create Some Starting Values
global score
alienreload = ALIEN_RELOAD
clock = pg.time.Clock()
# initialize our starting sprites
global SCORE
player = Player(player_name)
Alien() # note, this 'lives' because it goes into a sprite group
if pg.font:
all.add(Score())
# Run our main loop whilst the player is alive.
while player.alive():
# get input
for event in pg.event.get():
if event.type == pg.QUIT:
return
if event.type == pg.KEYDOWN and event.key == pg.K_ESCAPE:
return
elif event.type == pg.KEYDOWN:
if event.key == pg.K_f:
if not fullscreen:
print("Changing to FULLSCREEN")
screen_backup = screen.copy()
screen = pg.display.set_mode(
SCREENRECT.size, winstyle | pg.FULLSCREEN, bestdepth
)
screen.blit(screen_backup, (0, 0))
else:
print("Changing to windowed mode")
screen_backup = screen.copy()
screen = pg.display.set_mode(
SCREENRECT.size, winstyle, bestdepth
)
screen.blit(screen_backup, (0, 0))
pg.display.flip()
fullscreen = not fullscreen
keystate = pg.key.get_pressed()
# clear/erase the last drawn sprites
all.clear(screen, background)
# update all the sprites
all.update()
# handle player input
direction = keystate[pg.K_RIGHT] - keystate[pg.K_LEFT]
player.move(direction)
firing = keystate[pg.K_SPACE]
if not player.reloading and firing and len(shots) < MAX_SHOTS:
Shot(player.gunpos())
if pg.mixer:
shoot_sound.play()
player.reloading = firing
# Create new alien
if alienreload:
alienreload = alienreload - 1
elif not int(random.random() * ALIEN_ODDS):
Alien()
alienreload = ALIEN_RELOAD
# Drop bombs
if lastalien and not int(random.random() * BOMB_ODDS):
Bomb(lastalien.sprite)
# Detect collisions between aliens and players.
for alien in pg.sprite.spritecollide(player, aliens, 1):
if pg.mixer:
boom_sound.play()
Explosion(alien)
Explosion(player)
SCORE = SCORE + 1
player.kill()
# See if shots hit the aliens.
for alien in pg.sprite.groupcollide(shots, aliens, 1, 1).keys():
if pg.mixer:
boom_sound.play()
Explosion(alien)
SCORE = SCORE + 1
# See if alien boms hit the player.
for bomb in pg.sprite.spritecollide(player, bombs, 1):
if pg.mixer:
boom_sound.play()
Explosion(player)
Explosion(bomb)
player.kill()
fps = pg.font.Font(None, 30).render(str(int(clock.get_fps())), True, pg.Color('white'))
screen.blit(fps, (50, 50))
# draw the scene
dirty = all.draw(screen)
pg.display.update(dirty)
# cap the framerate at 40fps. Also called 40HZ or 40 times per second.
clock.tick(40)
if pg.mixer:
pg.mixer.music.fadeout(1000)
pg.time.wait(1000)
pg.quit()
# call the "main" function if running this script
if __name__ == "__main__":
main()