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"""pygame support for pippy."""
# Copyright (C) 2007,2008 One Laptop per Child Association, Inc.
# Written by C. Scott Ananian <cscott@laptop.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
def pause():
"""Display a "Paused" screen and suspend."""
from gettext import gettext as _
import pygame
caption, icon_caption = pygame.display.get_caption()
screen = pygame.display.get_surface()
old_screen = screen.copy() # save this for later.
# dim the screen and display the 'paused' message in the center.
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
dimmed = screen.copy()
dimmed.set_alpha(128)
screen.fill(BLACK)
screen.blit(dimmed, (0, 0))
font = pygame.font.Font(None, 36) # 36px high
msg = _("PAUSED")
msg_surf = font.render(msg, True, BLACK, WHITE)
def center(rect, screen):
rect.center = (screen.get_width() / 2, screen.get_height() / 2)
rect = pygame.Rect((0, 0), msg_surf.get_size())
rect.inflate_ip(rect.width, rect.height)
center(rect, screen)
screen.fill(WHITE, rect)
rect = msg_surf.get_rect()
center(rect, screen)
screen.blit(msg_surf, rect)
pygame.display.flip()
# SUSPEND
try:
raise RuntimeError() # XXX don't try this yet. we should use ohm.
open('/sys/power/state', 'w').write('mem')
except: # couldn't suspend (no permissions?)
pygame.event.post(pygame.event.wait())
pygame.display.set_caption(caption, icon_caption)
screen.blit(old_screen, (0, 0))
pygame.display.flip()
_last_event_time = 0
_default_clock = None
def next_frame(max_fps=20, idle_timeout=20, clock=None, pause=pause):
"""Limit maximum frame rate of pygame. Returns True.
If idle longer than the idle_timeout (in seconds), then we'll put up a
"paused" message and the XO will suspend. This ensures that we don't
burn up all of our battery running an animation!"""
import pygame
global _last_event_time, _default_clock
if _default_clock is None:
_default_clock = pygame.time.Clock()
if clock is None:
clock = _default_clock
clock.tick(max_fps)
if pygame.event.peek(xrange(pygame.NOEVENT, pygame.USEREVENT)):
# we're not idle anymore.
_last_event_time = pygame.time.get_ticks()
elif (pygame.time.get_ticks() - _last_event_time) >= idle_timeout * 1000:
# we've been idle for a long time. Pause & suspend.
pause()
_last_event_time = pygame.time.get_ticks()
return True
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