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# encoding: utf-8
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"""
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Enable pyglet to be used interactively by setting PyOS_InputHook.
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Authors
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-------
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* Nicolas P. Rougier
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* Fernando Perez
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import os
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import sys
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import time
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from timeit import default_timer as clock
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import pyglet
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#-----------------------------------------------------------------------------
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# Platform-dependent imports and functions
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#-----------------------------------------------------------------------------
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if os.name == 'posix':
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import select
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def stdin_ready():
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infds, outfds, erfds = select.select([sys.stdin],[],[],0)
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if infds:
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return True
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else:
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return False
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elif sys.platform == 'win32':
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import msvcrt
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def stdin_ready():
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return msvcrt.kbhit()
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# On linux only, window.flip() has a bug that causes an AttributeError on
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# window close. For details, see:
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# http://groups.google.com/group/pyglet-users/browse_thread/thread/47c1aab9aa4a3d23/c22f9e819826799e?#c22f9e819826799e
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if sys.platform.startswith('linux'):
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def flip(window):
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try:
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window.flip()
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except AttributeError:
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pass
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else:
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def flip(window):
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window.flip()
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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def inputhook_pyglet():
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"""Run the pyglet event loop by processing pending events only.
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This keeps processing pending events until stdin is ready. After
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processing all pending events, a call to time.sleep is inserted. This is
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needed, otherwise, CPU usage is at 100%. This sleep time should be tuned
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though for best performance.
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"""
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# We need to protect against a user pressing Control-C when IPython is
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# idle and this is running. We trap KeyboardInterrupt and pass.
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try:
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t = clock()
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while not stdin_ready():
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pyglet.clock.tick()
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for window in pyglet.app.windows:
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window.switch_to()
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window.dispatch_events()
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window.dispatch_event('on_draw')
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flip(window)
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# We need to sleep at this point to keep the idle CPU load
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# low. However, if sleep to long, GUI response is poor. As
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# a compromise, we watch how often GUI events are being processed
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# and switch between a short and long sleep time. Here are some
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# stats useful in helping to tune this.
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# time CPU load
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# 0.001 13%
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# 0.005 3%
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# 0.01 1.5%
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# 0.05 0.5%
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used_time = clock() - t
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if used_time > 10.0:
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# print 'Sleep for 1 s' # dbg
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time.sleep(1.0)
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elif used_time > 0.1:
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# Few GUI events coming in, so we can sleep longer
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# print 'Sleep for 0.05 s' # dbg
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time.sleep(0.05)
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else:
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# Many GUI events coming in, so sleep only very little
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time.sleep(0.001)
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except KeyboardInterrupt:
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pass
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return 0
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