1 files changed, 61 insertions, 0 deletions
diff --git a/library/pippy/game.py b/library/pippy/game.py
new file mode 100644
index 0000000..e5996fa
--- /dev/null
+++ b/library/pippy/game.py
@@ -0,0 +1,61 @@
+"""pygame support for pippy."""
+
+import pygame
+
+def pause():
+    # display a "Paused" screen and suspend.
+    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(WHITE)
+    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:
+        open('/sys/power/state','w').write('mem')
+    except: # XXX: 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
+def next_frame(max_fps=20, idle_timeout=20, clock=pygame.time.Clock()):
+    """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!"""
+    global _last_event_time
+    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