[Matplotlib-users] ginput with undefined number of points
Hi, I trying to define an area in a pcolor plot (several plots) using the ginput(). However since it is an irregular shape and will be different in each plot so I cant define how many points there will be before hand, I've tried the following but it requires a double click at each point, which I would like to avoid as it duplicates points |x = randn(10,10) imshow(x) button = False points = [] while button == False: points.append(ginput(1)) button = waitforbuttonpress() | Anyone know a better way to go about this?? thanks Dave -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] ginput with undefined number of points
On Thu, Jun 7, 2012 at 9:07 AM, David Craig dcdavem...@gmail.com wrote:
Hi,
I trying to define an area in a pcolor plot (several plots) using the
ginput(). However since it is an irregular shape and will be different in
each plot so I cant define how many points there will be before hand, I've
tried the following but it requires a double click at each point, which I
would like to avoid as it duplicates points
x = randn(10,10)
imshow(x)
button = False
points = []
while button == False:
points.append(ginput(1))
button = waitforbuttonpress()
Anyone know a better way to go about this??
thanks
Dave
I would utilize the event handling mechanism within mpl to do this. You
can create a function that would append the xy coordinates to points at
each call. Here is a mockup.
def on_press(event) :
on_press.points.append((event.xdata, event.ydata))
on_press.points = []
Then, you would need some way to indicate that you want to start and
finish, such as some sort of key press:
def key_press(event) :
if event.key == 'a' :
if key_press.active :
key_press.mouse_cid =
key_press.fig.canvas.mpl_connect('button_press_event', on_press)
else :
key_press.fig.canvas.mpl_disconnect(key_press.mouse_cid)
key_press.active = not key_press.active
key_press.active = False
key_press.fig = plt.figure()
key_press.fig.canvas.mpl_connect('key_press_event', key_press)
There are some more elegant ways of doing this, particularly by creating
some sort of object to hold these variables, but this is a quick and dirty
way of doing it.
I hope that helps!
Ben Root
--
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
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will include endpoint security, mobile security and the latest in malware
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Re: [Matplotlib-users] ginput with undefined number of points
Le jeudi 07 juin 2012 à 14:07 +0100, David Craig a écrit : Hi, I trying to define an area in a pcolor plot (several plots) using the ginput(). However since it is an irregular shape and will be different in each plot so I cant define how many points there will be before hand, I've tried the following but it requires a double click at each point, which I would like to avoid as it duplicates points |x = randn(10,10) imshow(x) button = False points = [] while button == False: points.append(ginput(1)) button = waitforbuttonpress() | Anyone know a better way to go about this?? thanks Dave ginput has a way to do it. From docs: If n is zero or negative, accumulate clicks until a middle click (or potentially both mouse buttons at once) terminates the input. http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.ginput Pressing [enter] also terminates the points acquisition. -- Fabrice Silva si...@lma.cnrs-mrs.fr LMA UPR CNRS 7051 -- Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
