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@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@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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