RE: [OpenJade] OpenJade 1.2.2 Released

[Avi Kivity <Avi@xxxxxxxxxxxxx>]

On Friday, July 23, 1999 18:44, Chris Maden [SMTP:crism@xxxxxxxxxxx] wrote:
> [Avi Kivity]
> > * + and - return a length-spec if any of there arguments is a
> > length-spec.
> 
> How does that work?  I assume the numbers are coerced into lengths,
> but with what units?  E.g., given:
> 
> (+ 2.54cm
>    1in
>    5)
> 
> what is the result?
A runtime error.
 
You're confusing dimensions and length-spec-ism:
  5 --> quantity, dimension 0
  1in --> quantity, dimension 1
  2.54cm --> ditto
  (display-size) --> length-spec

You can't add quantities of mixed dimensions. You can, however add a
length-spec to a quantity of dimension 1.
A length-spec is a quantity of dimension 1 whose value is not known at
processing time, similar to (inherited-*).

It appears that the only way to generate a length-spec which is not a linear
combination of other length-specs is to use the (display-size) procedure.

See 12.5.2.

- Avi
--
"The only words which have meaning are the last ones spoken"


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