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from ctypes import cdll, c_int, c_uint, c_void_p, byref, Structure, Union
libspnav = cdll.LoadLibrary('libspnav.so')
SPNAV_EVENT_ANY = 0
SPNAV_EVENT_MOTION = 1
SPNAV_EVENT_BUTTON = 2
class spnav_event_motion(Structure):
_fields_ = [('type', c_int),
('x', c_int),
('y', c_int),
('z', c_int),
('rx', c_int),
('ry', c_int),
('rz', c_int),
('period', c_uint),
('data', c_void_p)]
class spnav_event_button(Structure):
_fields_ = [('type', c_int),
('press', c_int),
('bnum', c_int)]
class spnav_event(Union):
_fields_ = [('type', c_int),
('motion', spnav_event_motion),
('button', spnav_event_button) ]
def __str__(self):
if self.type == SPNAV_EVENT_ANY:
return 'SPNAV_EVENT_ANY'
elif self.type == SPNAV_EVENT_MOTION:
m = self.motion
return 'SPNAV_EVENT_MOTION t(%d,%d,%d) r(%d,%d,%d)' % (m.x, m.y, m.z, m.rx, m.ry, m.rz)
elif self.type == SPNAV_EVENT_BUTTON:
if self.button.press:
state = 'down'
else:
state = 'up'
return 'SPNAV_EVENT_BUTTON %d %s' % (self.button.bnum, state)
def spnav_open():
if libspnav.spnav_open() == -1:
raise Exception('failed to connect to the space navigator daemon')
def spnav_close():
libspnav.spnav_close()
def spnav_fd():
return libspnav.spnav_fd()
def spnav_wait_event():
ev = spnav_event()
ret = libspnav.spnav_wait_event(byref(ev))
if ret:
return ev
else:
raise Exception('non-zero return code from spnav_wait_event()')
def spnav_poll_event():
ev = spnav_event()
ret = libspnav.spnav_poll_event(byref(ev))
if ret == 0:
return None
else:
return ev
def spnav_remove_events(event_type):
return libspnav.spnav_remove_events(event_type)
if __name__ == '__main__':
spnav_open()
try:
while True:
ev = spnav_wait_event()
print ev
finally:
spnav_close()
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