On Feb 5, 2008 3:58 PM, John Hunter <[EMAIL PROTECTED]> wrote:
> On Feb 2, 2008 8:48 AM, Gael Varoquaux <[EMAIL PROTECTED]> wrote:
>
> > Here is the new patch. I added visual feedback when accumulating points.
> > I hope the docstrings are clear.
>
> Great -- thanks again. I applied this patch and created a new example
> ginput_demo.py
Jack replied to me offlist so I am going to paste in his post below.
Perhaps you and Gael can consult on the ideal functionality of ginput
vis-a-vis optional line segment drawing, etc...
From Jack Sankey <[EMAIL PROTECTED]>
to John Hunter <[EMAIL PROTECTED]>,
date Feb 5, 2008 4:02 PM
subject Re: [matplotlib-devel] ginput: blocking call for mouse input
mailed-by gmail.com
Woa, it's working on GTKAgg using wx.Yield()? You must have added some voodoo :)
Also, my version of GaelInput has seemed to stop evolving. This
version has the option to draw lines between clicks, which I use a
lot. Also, the default timeout is 0 now, since you can always
right-click to abort.
-Jack
class GaelInput(object):
"""
Class that create a callable object to retrieve mouse click in a
blocking way, a la MatLab. 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
lines = False # if we should draw the lines
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])
# now if we're supposed to draw lines, do so
if self.lines and len(self.clicks) > 1:
event.inaxes.plot([self.clicks[-1][0], self.clicks[-2][0]],
[self.clicks[-1][1], self.clicks[-2][1]],
color='w', linewidth=2.0,
scalex=False, scaley=False)
event.inaxes.plot([self.clicks[-1][0], self.clicks[-2][0]],
[self.clicks[-1][1], self.clicks[-2][1]],
color='k', linewidth=1.0,
scalex=False, scaley=False)
_pylab.draw()
# 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=0, debug=False, lines=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
lines=False draw lines between clicks
"""
# just for printing the coordinates
self.debug = debug
# for drawing lines
self.lines = lines
# 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 _numpy.array(self.clicks)
def ginput(n=1, timeout=0, show=True, lines=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
show=True print the clicks as they are received
lines=False draw lines between clicks
"""
x = GaelInput()
return x(n, timeout, show, lines)
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