pocket-friends/pocket_friends/game.py

import pygame
import os
import pocket_friends
import importlib

valid_surfaces = [
    '_dev_menu',
    '_black_screen',
    '_error_screen',
    'title',
    'egg_select',
    'selection_info',
]

# Add all the surface modules to a dictionary for easy switching
surface_modules = {}
for module in valid_surfaces:
    if module[0] == '_':
        surface_modules[module] = importlib.import_module('pocket_friends._development.surfaces.{0}'.format(module))
    else:
        surface_modules[module] = importlib.import_module('pocket_friends.surfaces.{0}'.format(module))

# FPS for the game to run at.
game_fps = 16
# The internal resolution of the game
game_res = 80

# Get the path for where all game resources are (images, fonts, sounds, etc.)
script_dir = os.path.dirname(os.path.abspath(__file__))
resources_dir = script_dir + '/resources'

# Makes Pygame draw on the display of the RPi.
os.environ['SDL_FBDEV'] = '/dev/fb1'


def start_game(resolution, dev):
    """
    Starts the game.

    Args:
        resolution (int, optional): Resolution to display the game at. Defaults to 240.
        dev (bool): Boolean to enable the developer menu at start or not
    """

    pygame.init()

    # Hide the cursor for the Pi display.
    pygame.mouse.set_visible(False)

    if dev:
        starting_surface = '_dev_menu'
    else:
        starting_surface = 'title'

    window = pygame.display.set_mode((resolution, resolution))
    surface = surface_modules.get(starting_surface).Surface((game_res, game_res), resources_dir, game_fps)

    # Only really useful for PCs. Does nothing on the Raspberry Pi.
    pygame.display.set_caption('Pocket Friends {0}'.format(pocket_friends.__version__))

    # Add an icon to the pygame window.
    icon = pygame.image.load(resources_dir + '/icon/icon.png').convert_alpha()
    pygame.display.set_icon(icon)

    running = True

    while running:
        surface.update()

        # The game is only 80x80px, however it is upscaled to whatever the running resolution is.
        frame = pygame.transform.scale(surface, (resolution, resolution))
        window.blit(frame, frame.get_rect())

        # When the current surface is not running, check to make sure that the next surface will be valid
        if not surface.running:
            # Force the dev menu to appear if the flag has been passed
            if surface.dev_override:
                next_surface = '_dev_menu'
            else:
                next_surface = surface.next_surface

            # Send to the error screen if the given surface isn't a valid one
            if next_surface not in valid_surfaces:
                next_surface = '_error_screen'

            # Get the additional args to pass on from the ending surface to the next one
            additional_args = surface.additional_args
            # Create the new surface and pass through the additional argss
            surface = surface_modules.get(next_surface).Surface((game_res, game_res), resources_dir,
                                                                game_fps, **additional_args)
        pygame.display.flip()

    pygame.quit()