[Octave-patch-tracker] [patch #8722] implement impixelinfo and impixelinfoval

[Carnë Draug]

Update of patch #8722 (project octave):

                 Summary: For image() and imagesc(), added value readout in
status bar when mousing over a figure => implement impixelinfo and
impixelinfoval

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Follow-up Comment #6:

This behaviour needs to be implemented in the image package as impixelinfoval
and impixelinfo.

I believe that the development versions of octave make this possible. You will
need to create a uicontrol object of type text. Then you need to set a
listener on the image that changes the text as the mouse moves over the
image.

After looking at the two functions, might be easier to implement
impixelinfoval first. The function impixelinfo can then make use of
impixelinfoval.

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