[Octave-bug-tracker] [bug #44959] Display coordinates of mouse cursor in QtHandles figures

[Martin Kunz]

Follow-up Comment #15, bug #44959 (project octave):

I cannot test the patch, but I would like to add my thoughts about the
question of precision of the displayed coordinates.
Do 6 digits hurt anybody? Probably not. However, I have regretted FLTKs lower
precision several times, because I could not see the differences between two
points of a curve in the coordinates. I do favour 6 digits!

This depends a lot on what you plot, but in case of real data you can easily
be interested in what happens after the 4th digit. Take for example a 16bit
analog to digital converter, which is nothing fancy nowadays. One least
significant bit translates to a relative change of 0.000015, so you need 7 of
those steps to see any difference in a 4 digit coordinate display.

Of course, someone using 24bit data might step forward now and demand 8
digits... Well, I'm not against it. ;-) But I understand that there are
practical limits - a 2x15 digits display is annoying and needs too much space
in the figure window. So what we need is a reasonable balance. For what I have
seen so far, 6 digits would be a good compromise.

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