[Octave-bug-tracker] [bug #46084] image package: imcrop() doesn't work any more

[Hartmut]

Follow-up Comment #3, bug #46084 (project octave):

Thanks for this patch!

I have tested it. And I think it fully solves the original issue of this bug
report. You can interactivly crop images (I tested grayscale and rgb) with
this patch, now.

Testing the patch, I noticed two (hopefully easy) improvements, that would
make this interactive use of the imcrop function even more useful:

* Couldn't we display a short text message on the console, before the user
then needs to click twice into the displayed image? Something like this:
"Please click twice into the image figure in order to mark two corners of the
area you want to crop out."

* Currently you first need to click into the upper left corner of your
intended crop region, and afterwards into the lower right corner. If you do it
the other way round, you will only get an error message. Couldn't we easily
resort the return values of ginput in order to make the two clicks work
properly, even if they are in the "wrong" order?

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