Superscript / subscript text in button?

[Everto Rex]

Hello people, can I attach text in superscript or subscript to a button? I'm working in a little project and I need put several chemical products names like  Fe₃(SO4)₃ or KNO₃

Well, is posible do that or I need write a new class based in Fl_Button.*? Any suggestions are welcome. Thanks !!

[Ian MacArthur]

On Thu Mar 19 2015 21:49:13, Everto Rex wrote:
> Hello people, can I attach text in superscript or subscript to a button? I'm working in a little project and I need put several chemical products names like Fe₃(SO4)₃ or KNO₃
>
> Well, is posible do that or I need write a new class based in Fl_Button.*? Any suggestions are welcome. Thanks !!

Fltk doesn’t have any complex text layout engine, so formatting text for super/sub-script, etc., is not handled by fltk.
You can of course generate all the necessary symbols and glyphs, but you will probably need to do the actual layout yourself...

I think creating your own label class might be the way to go, then call that from your button to render the requisite label as needed.

[Greg Ercolano]

I must say I don't think I've ever seen super/subscript inside FLTK
during utf8 tests, but haven't actually tried the Unicode super/subscript modes
described here: http://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts

[Edzard Egberts]

Everto Rex wrote:
> Hello people, can I attach text in superscript or subscript to a button?
> I'm working in a little project and I need put several chemical products
> names like Fe₃(SO4)₃ or KNO₃
>
> Well, is posible do that or I need write a new class based in
> Fl_Button.*?

I wrote this kind of class for a Fl_Box. You only need to derive it from
Fl_Button instead of Fl_Box. It's not a nice piece of software and just
was developed to the point it barely works, but it works. When you find
some improvements I would be glad to get some code back. ;o)

[dori...@gmail.com]

You could create images of button labels with some other software (such as Photoshop), and put those images on the buttons.

[Everto Rex]

On Thursday, March 19, 2015 at 6:51:31 PM UTC-3, Everto Rex wrote:

Hello people, can I attach text in superscript or subscript to a button? I'm working in a little project and I need put several chemical products names like  Fe₃(SO4)₃ or KNO₃

Well, is posible do that or I need write a new class based in Fl_Button.*? Any suggestions are welcome. Thanks !!

 Well, thanks for answering my question. As Ian says, I must develop a class for the superscript / subscript text, and this work has been done by ed_09. Following the suggestion of Greg and ed_09's class, I made a demo
dori, I can not use images because text changes dynamically.

[Greg Ercolano]

On 03/20/15 12:23, Everto Rex wrote:
> Well, thanks for answering my question. As Ian says, I must develop a class
> for the superscript / subscript text, and this work has been done by ed_09.
> Following the suggestion of Greg and ed_09's class, I made a demo

Seems to compile and run pretty well here on linux; looks good!
Screenshot of the resulting app attached.. very cool.

[crocher...@gmail.com]

Just jumping in the discussion for a quick suggestion: your Scientific _Button looks really good, why not using a more standard syntax, Latex like, for this:  _ for subscript and ^ for superscript ? "Fe~t3~.(SO~t4~.) (PO~t4~.)~h-3~." would became "Fe_3 (SO_4) (PO_4)^{-3}" or "Fe_{3} (SO_{4}) (PO_{4})^{-3}" depending how the parsing is done.

[Ian MacArthur]

On Fri Mar 20 2015 23:32:32, crocher...@gmail.com wrote:
> Just jumping in the discussion for a quick suggestion: your Scientific _Button looks really good, why not using a more standard syntax, Latex like, for this: _ for subscript and ^ for superscript ? "Fe~t3~.(SO~t4~.) (PO~t4~.)~h-3~." would became "Fe_3 (SO_4) (PO_4)^{-3}" or "Fe_{3} (SO_{4}) (PO_{4})^{-3}" depending how the parsing is done.

I had wondered if some html-inspired syntax might be more useful; but the “Latex style" does look more readable.

That said, I’ve never been that keen on Latex...

[Daniel Rubén Ome]

El viernes, 20 de marzo de 2015, 20:32:32 (UTC-3), crocher...@gmail.com escribió:

Just jumping in the discussion for a quick suggestion: your Scientific _Button looks really good, why not using a more standard syntax, Latex like, for this:  _ for subscript and ^ for superscript ? "Fe~t3~.(SO~t4~.) (PO~t4~.)~h-3~." would became "Fe_3 (SO_4) (PO_4)^{-3}" or "Fe_{3} (SO_{4}) (PO_{4})^{-3}" depending how the parsing is done.

I made a few changes to code for use the Latex style.

[crocher...@gmail.com]

Looks really nice ! At least to me but I certainly have a biased in favour of this syntax since I'm a Latex user, but if I'm correct that's the same syntax used by MS Office or Open/Libre Office equations editors so I feel it's more "standard".

Anyway, I need to find a project in which I need that widgets !

[bat]

Those buttons do look lovely but the frustrated chemist in me says shouldn't they be 3- rather than -3 ;-?

[Greg Ercolano]

On 03/25/15 09:37, bat wrote:
> Those buttons do look lovely but the frustrated chemist in me says shouldn't they be 3- rather than -3 ;-?

Marking this off topic, and I'm not the OP,
but I'm thinking you're right.

What's the rule on that exactly? I'm thinking the sign on superscripts
appear: as a suffix for negative ions, and a prefix for positive ions?

I've definitely seen in the same book:

SO_4^+2
SO_4^2-

(using the ^ and _ notation for super- and sub-scripts respectively)

Oddly, my AP chem book from the 70's doesn't seem to cover these
nuances, and I've been away from this stuff far too long to remember..

[bat]

I have only ever seen the number before the sign for both + and - charges of ions. I think it helps to avoid confusion with + and - powers e.g. kg m^-3 being kg per cubic metre, etc,... no doubt preaching to the converted again.

On Thursday, 19 March 2015 21:51:31 UTC, Everto Rex wrote: