#!/usr/bin/env python
"""This is a much simpler version of the aliens.py example. It makes a good place for beginners to get used to the way pygame works. Gameplay is pretty similar, but there are a lot less object types to worry about, and it makes no attempt at using the optional pygame modules. It does provide a good method for using the updaterects to only update the changed parts of the screen, instead of the entire screen surface. This has large speed benefits and should be used whenever the fullscreen isn't being changed."""
#import import random, os.path, sys import pygame from pygame.locals import *
if not pygame.image.get_extended(): raise SystemExit("Requires the extended image loading from SDL_image")
#constants FRAMES_PER_SEC = 40 PLAYER_SPEED = 12 MAX_SHOTS = 2 SHOT_SPEED = 10 ALIEN_SPEED = 12 ALIEN_ODDS = 45 EXPLODE_TIME = 6 SCREENRECT = Rect(0, 0, 640, 480)
#some globals for friendly access dirtyrects = [] # list of update_rects next_tick = 0 # used for timing class Img: pass # container for images main_dir = os.path.split(os.path.abspath(__file__))[0] # Program's diretory
#first, we define some utility functions def load_image(file, transparent): "loads an image, prepares it for play" file = os.path.join(main_dir, 'data', file) try: surface = pygame.image.load(file) except pygame.error: raise SystemExit('Could not load image "%s" %s' % (file, pygame.get_error())) if transparent: corner = surface.get_at((0, 0)) surface.set_colorkey(corner, RLEACCEL) return surface.convert()
# The logic for all the different sprite types
class Actor: "An enhanced sort of sprite class" def __init__(self, image): self.image = image self.rect = image.get_rect() def update(self): "update the sprite state for this frame" pass def draw(self, screen): "draws the sprite into the screen" r = screen.blit(self.image, self.rect) dirtyrects.append(r) def erase(self, screen, background): "gets the sprite off of the screen" r = screen.blit(background, self.rect, self.rect) dirtyrects.append(r)
class Player(Actor): "Cheer for our hero" def __init__(self): Actor.__init__(self, Img.player) self.alive = 1 self.reloading = 0 self.rect.centerx = SCREENRECT.centerx self.rect.bottom = SCREENRECT.bottom - 10
def move(self, direction): self.rect = self.rect.move(direction*PLAYER_SPEED, 0).clamp(SCREENRECT)
class Alien(Actor): "Destroy him or suffer" def __init__(self): Actor.__init__(self, Img.alien) self.facing = random.choice((-1,1)) * ALIEN_SPEED if self.facing < 0: self.rect.right = SCREENRECT.right def update(self): global SCREENRECT self.rect[0] = self.rect[0] + self.facing if not SCREENRECT.contains(self.rect): self.facing = -self.facing; self.rect.top = self.rect.bottom + 3 self.rect = self.rect.clamp(SCREENRECT)
class Explosion(Actor): "Beware the fury" def __init__(self, actor): Actor.__init__(self, Img.explosion) self.life = EXPLODE_TIME self.rect.center = actor.rect.center def update(self): self.life = self.life - 1
class Shot(Actor): "The big payload" def __init__(self, player): Actor.__init__(self, Img.shot) self.rect.centerx = player.rect.centerx self.rect.top = player.rect.top - 10
def update(self): self.rect.top = self.rect.top - SHOT_SPEED
def main(): "Run me for adrenaline" global dirtyrects
# Initialize SDL components pygame.init() screen = pygame.display.set_mode(SCREENRECT.size, 0) clock = pygame.time.Clock()
# Load the Resources Img.background = load_image('background.gif', 0) Img.shot = load_image('shot.gif', 1) Img.bomb = load_image('bomb.gif', 1) Img.danger = load_image('danger.gif', 1) Img.alien = load_image('alien1.gif', 1) Img.player = load_image('oldplayer.gif', 1) Img.explosion = load_image('explosion1.gif', 1)
# Create the background background = pygame.Surface(SCREENRECT.size) for x in range(0, SCREENRECT.width, Img.background.get_width()): background.blit(Img.background, (x, 0)) screen.blit(background, (0,0)) pygame.display.flip()
# Initialize Game Actors player = Player() aliens = [Alien()] shots = [] explosions = []
# Main loop while player.alive or explosions: clock.tick(FRAMES_PER_SEC)
# Gather Events pygame.event.pump() keystate = pygame.key.get_pressed() if keystate[K_ESCAPE] or pygame.event.peek(QUIT): break
# Clear screen and update actors for actor in [player] + aliens + shots + explosions: actor.erase(screen, background) actor.update() # Clean Dead Explosions and Bullets for e in explosions: if e.life <= 0: explosions.remove(e) for s in shots: if s.rect.top <= 0: shots.remove(s)
# Move the player direction = keystate[K_RIGHT] - keystate[K_LEFT] player.move(direction)
# Create new shots if not player.reloading and keystate[K_SPACE] and len(shots) < MAX_SHOTS: shots.append(Shot(player)) player.reloading = keystate[K_SPACE]
# Create new alien if not int(random.random() * ALIEN_ODDS): aliens.append(Alien())
# Detect collisions alienrects = [] for a in aliens: alienrects.append(a.rect)
hit = player.rect.collidelist(alienrects) if hit != -1: alien = aliens[hit] explosions.append(Explosion(alien)) explosions.append(Explosion(player)) aliens.remove(alien) player.alive = 0 for shot in shots: hit = shot.rect.collidelist(alienrects) if hit != -1: alien = aliens[hit] explosions.append(Explosion(alien)) shots.remove(shot) aliens.remove(alien) break
# Draw everybody for actor in [player] + aliens + shots + explosions: actor.draw(screen)
pygame.display.update(dirtyrects) dirtyrects = []
pygame.time.wait(50)
#if python says run, let's run! if __name__ == '__main__': main()
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