Feature Request: Make negative coordinates possible on (full) Graphic LCDs

[AnHardt]

Make negative coordinates possible on (full) Graphic LCDs.

[thinkyhead]

Is this still not done? It should be a pretty quick fix, yes?

[AnHardt]

No space. For negative numbers we have to drop a digit.
Did not make sense to me before #2989 (or one of the predecessors) was merged (changing the same lines of code).

[Roxy-3D]

Maybe the number could be done in inverse video to indicate it has flipped to minus? That is kind of a kludged solution, but if there is no space for a minus sign... and the feature is needed, some way needs to be found to indicate the status....

[AnHardt]

#2675 (comment)
is already a reasonable plan i think. For that small numbers between -100 to -999 you don't need the last digit - if displaying the x/y-coordinates makes sense at all.

[Roxy-3D]

The LCD Panels are slow enough as it is... But with a proportional font, digits (and decimal point) would pack tighter together. But "Yes!" When you are in the range of -100 to -999 you can afford to lose a digit.

[thinkyhead]

Yeah, I was thinking also, just drop a digit. But for a very big delta, -100 might just be far from center. Hmm....

[AnHardt]

display_error = abs(position - displayed_postition)
position = -100.1
displayed_position "100.1" > display_error = 200.2
displayed_position "-100." > display_error = 0.1

position = -998.9
displayed_position "998.9" > display_error = 1,997.8
displayed_position "-999." > display_error = 0.1

Even in a bad implementation the display_error is never larger than 1.
The sign is much more important, than to know about the digits behind the dot.

If you want to know a more exact reading you could go to the move_menu, where we have infinite room to display digits.

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