Condiotional Formatting a Calculation Field

I am running Filemaker Pro v8.5 under Win XP.
How can I conditionally colour the output of a Calculation Field?

I have been using the following formulation (kindly received from this forum) to conditionally colour the text in a Text input field.  I use the Auto-enter Calculation Tab, then declick the do not replace existing value.

Case(Field="U";Colour Choice[1];
Field="D";Colour Choice[2];
"")

It works well, but I have not found a way to use the idea in a Calculation Field, which (obviously) already has a calculation in it.  I have tried using "AND" after the original calculation formula, and then inserting this idea, but I cannot get it to work, and it seems in fact to mess up the recalculation of the calculation field when that is otherwise necessary.

Would appreciate guidance.
aws148Asked:
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lesouefCommented:
this won't work, there is an overlap in between 0 and 0.1
if that would be red for negative and blue for 0 and positive values:

result=
If ((number1 - number2) < 0 ;
TextColor ( number1 - number2; RGB ( 255; 0; 0) ) ;
TextColor ( number1 - number2; RGB ( 0;0; 255) )
)
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lesouefCommented:
give me yr calc formula, I'll modify it to get it coloured.
and tell me the criteria to switch colours depending on the calc. value
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aws148Author Commented:
Thanks.
The calculation formula is simply Number Field 1 - Number Field 2
I want to colour RED when result is <0.1 and BLUE when result is >0
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aws148Author Commented:
Sorry for delay, I was called away to do some firefighting.
Thanks for the proposal, but I don't fully understand it.
I want this Calculation field (a) show the result of the calculation, which will be an integer, and (b) to colour the result red or blue.
As I understand your code it only does (b).
Could you clarify?
Thanks
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lesouefCommented:
no, fm is quite clever on this, you can still manipulate the coloured expression as a number.
of course, the colour attribute will be lost in a further calculation, but you have nothing to do, it does a kind of automatic getasnumber() function on it if you use it a further calculation
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aws148Author Commented:
Well that's a surprise.  I'd never have guessed that, but can confirm that it's working for me.
Thanks very much
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