Hello again,
Just an update to the ginput() I'm using now. If you clicked really
fast using the previous version, the event queue would fill up and
you'd wind up getting extra clicks in your list. This version fixes
that and adds the ability to (a) terminate the collection process with
a right click, and (b) set n=0 to keep collecting clicks indefinitely
until you right click. It also now returns a 2-d list rather than a
list of (,)'s.
Cheers,
Jack
class GaelInput(object):
"""
Class that creates a callable object to retrieve mouse click in a
blocking way, as in MatLab. This is based on Gael Varoquaux's
almost-working object. Thanks Gael! I've wanted to get this
working for years!
-Jack
"""
debug = False
cid = None # event connection object
clicks = [] # list of click coordinates
n = 1 # number of clicks we're waiting for
def on_click(self, event):
"""
Event handler that will be passed to the current figure to
retrieve clicks.
"""
# write the debug information if we're supposed to
if self.debug: print "button "+str(event.button)+":
"+str(event.xdata)+", "+str(event.ydata)
# if this event's a right click we're done
if event.button == 3:
self.done = True
return
# if it's a valid click (and this isn't an extra event
# in the queue), append the coordinates to the list
if event.inaxes and not self.done:
self.clicks.append([event.xdata, event.ydata])
# if we have n data points, we're done
if len(self.clicks) >= self.n and self.n is not 0:
self.done = True
return
def __call__(self, n=1, timeout=30, debug=False):
"""
Blocking call to retrieve n coordinate pairs through mouse clicks.
n=1 number of clicks to collect. Set n=0 to keep collecting
points until you click with the right mouse button.
timeout=30 maximum number of seconds to wait for clicks
before giving up.
timeout=0 to disable
debug=False show each click event coordinates
"""
# just for printing the coordinates
self.debug = debug
# connect the click events to the on_click function call
self.cid = _pylab.connect('button_press_event', self.on_click)
# initialize the list of click coordinates
self.clicks = []
# wait for n clicks
self.n = n
self.done = False
t = 0.0
while not self.done:
# key step: yield the processor to other threads
_wx.Yield();
_time.sleep(0.1)
# check for a timeout
t += 0.1
if timeout and t > timeout: print "ginput timeout"; break;
# All done! Disconnect the event and return what we have
_pylab.disconnect(self.cid)
self.cid = None
return self.clicks
def ginput(n=1, timeout=30, debug=False):
"""
Simple functional call for physicists. This will wait for n clicks
from the user and
return a list of the coordinates of each click.
n=1 number of clicks to collect
timeout=30 maximum number of seconds to wait for clicks
before giving up.
timeout=0 to disable
debug=False show debug information
"""
x = GaelInput()
return x(n, timeout, debug)
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