Linking events in skimage.viewer

[Nadav Horesh]

Thanks Steve. It works also on my system (linux). I'll look over why
II had a problem in my original application.

Sorry for the late response,

 Nadav

2013/12/23 Steven Silvester <steven.silvester at gmail.com>:
> Nadav,
>
> You want the slider to update the value as it is moving? If so, pass
> update_on="move" to Slider(). I tried your example, and my view does update
> on key presses. I am using skimage 0.9.3 on Windows 7.
>
> import matplotlib.pyplot as plt
> from skimage import data
> from skimage import viewer
> from skimage.viewer.plugins.overlayplugin import OverlayPlugin
> from skimage.viewer.widgets import Slider
>
> class Cimage(object):
>
>     def __init__(self):
>         self.recname = 'howdy'
>         self.rgb_image = data.camera()
>         self.gamma = 1
>
>     def key_press(self, event):
>         self.view.image = self.view.image[::-1]
>
>     def image_update(self, image, **kwargs):
>         return image[::-1] - int(kwargs['gamma']) * 5
>
>     def create_window(self):
>         self.view = viewer.ImageViewer(self.rgb_image)
>
>         plugin = OverlayPlugin(image_filter=self.image_update)
>         plugin += Slider('gamma', 1.0, 3.0
> , value=self.gamma,
> orientation='vertical', update_on='move')
>         plugin += Slider('mat mix', 0.0, 1.0, value=0.0,
> update_on='move', orientation='vertical')
>         plugin += Slider('wb mix', 0.0, 1.0, value=0.0,
> update_on='move', orientation='horizontal')
>
>         self.view += plugin
>         self.view.connect_event('key_press_event', self.key_press)
>         self.view.setWindowTitle(self.recname)
>         self.view.show()
>
> def main():
>     a = Cimage()
>     a.create_window()
>
> if __name__ == '__main__':
>     main()
>
> About my earlier example, you would need to call f.canvas.show instead of
> plt.show (I ran the code this time). But, if the MPLCanvas methods work, I’d
> stick with those.
>
> Cheers,
> Steve
>
>
>
> On Mon, Dec 23, 2013 at 8:10 AM, Nadav Horesh <nadavh.horesh at gmail.com>
> wrote:
>>
>> Tony,
>> I found the .connect_event method of the ImageViewer class just before
>> I got the reply from you, and it roughly works. I say roughly because
>> in the application there are some sliders that I added (not a part of
>> the built-in plugins), and what I see that I see an image update only
>> after I touch the sliders. In the linetool, however, the response is
>> immediate.
>>
>> Code snippet:
>>
>> class Cimage:
>> .
>> .
>> .
>>     def create_window(self):
>>         self.view = viewer.ImageViewer(self.rgb_image)
>>
>>         plugin = OverlayPlugin(image_filter=self.image_update)
>>         plugin += Slider('gamma', 1.0, 3.0, value=self.gamma,
>> orientation='vertical')
>>         plugin += Slider('mat mix', 0.0, 1.0, value=0.0,
>> update_on='move', orientation='vertical')
>>         plugin += Slider('wb mix', 0.0, 1.0, value=0.0,
>> update_on='move', orientation='horizontal')
>>
>>         self.view += plugin
>>         self.view.connect_event('key_press_event', self.key_press)
>>         self.view.setWindowTitle(self.recname)
>>         self.view.show()
>> .
>> .
>> .
>> in the key_press method execution chain I have
>> self.view.image = new_image
>>
>> so the image is updated, but it does not trigger a display update.
>>
>>
>>
>> Steve,
>> Here is your code after some typos correction:
>>
>> #! /usr/bin/python
>>
>> from __future__ import print_function
>>
>> from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg
>> import matplotlib.pyplot as plt
>> from skimage import data
>>
>>
>> class MyCanvas(FigureCanvasQTAgg):
>>
>>     def mousePressEvent(self, event):
>>         #pass
>>         print('press')
>>         self.image = self.image[::-1]
>>
>> def main():
>>     image = data.camera()
>>     f, ax = plt.subplots()
>>     f.canvas = MyCanvas(f)
>>     ax.imshow(image, interpolation='nearest')
>>     h, w = image.shape
>>     plt.show()
>>
>>
>> if __name__ == '__main__':
>>     main()
>>
>> Running it I see that the method mousePressEvent is not being called
>>
>>  I'll be happy to know if there is something to follow and build an
>> application based on the viewer module.
>>
>> Thank you both very much
>>
>> Nadav
>>
>>
>> 2013/12/23 Steven Silvester <steven.silvester at gmail.com>:
>> > Nadav,
>> >
>> > The canvas itself is a
>> > matplotlib.backends.backend_qt4agg.FigureCanvasQTAgg.
>> > If you wanted, you could subclass that class and provide your own
>> > mousePressEvent and friends. Something like:
>> >
>> > from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg
>> > import matplotlib.pyplot as plt
>> > from skimage import data
>> >
>> >
>> > class MyCanvas(FigureCanvasQtAgg):
>> >
>> >     def mousePressEvent(self, event):
>> >         pass
>> >
>> > def main():
>> >     image = data.camera()
>> >     f, ax = plt.subplots()
>> >     f.canvas = MyCanvas()
>> >     ax.imshow(image, interpolation='nearest')
>> >     h, w = image.shape
>> >     plt.show()
>> >
>> > On Wednesday, December 18, 2013 2:13:02 AM UTC-6, Nadav Horesh wrote:
>> >>
>> >> I
>> >> I started to build an interactive image exploration utility based on
>> >> matplotlib.  Recently, following a link on this list, I encountered
>> >> skimage.viewer, and found that the plugins architecture matches my
>> >> needs.
>> >> I could not find how to link keyboard and mouse events (and maybe
>> >> buttons)
>> >> to plugins. Any suggestions?
>> >>
>> >> I am using version 0.93 on linux (I can install the pre 0.10, if
>> >> needed)
>> >>
>> >>  Thanks,
>> >>
>> >>     Nadav
>> >
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