RE: [Groff] Piic behaviour

[Ted Harding]

On 03-Aug-07 15:10:06, Udo Krebelder wrote:
> Hi,
> 
> I have a strange problem with pic.  Here is the code:
> 
> ********************************
> .de PS
> ..
> .de PE
> ..
> .PS
> scale = 25.4
># draw right dimension arrow
> define LinR {[
>       X: line from $1 right 10
>       Y: line from $2 right 10
>       line <--> from X.center to Y.center sprintf("%g", $3) ljust
> ]}
># draw upper dimension arrow
> define LinU {[
>       X: line from $1 up 10
>       Y: line from $2 up 10
>       line <--> from X.center to Y.center sprintf("%g", $3) above
> ]}
> A: box wid 80 ht 100
> LinR(A.ne, A.se, A.ht)
> LinU(A.nw, A.ne, A.wid)
> .PE
> **********************************
> 
> I am not shure if i do something wrong, but the result are not two
> dimension arrows on the right and upper side of the rectangle
> (groff version 1.19.2).

Your mistake was to bracket the bodies of LinL and LinR within [...],
thus making each into a "block". In particular, names etc. occurring
within a block are local to the block, so inside the [...] the
block would not see "A" when passed "A.nw", for instance.


The cure is to remove the "[" and "]":

.PS
scale = 25.4
# draw right dimension arrow
define LinR {
        X: line from $1 right 10
        Y: line from $2 right 10
        line <--> from X.center to Y.center sprintf("%g", $3) ljust
}

# draw upper dimension arrow
define LinU {
        X: line from $1 up 10
        Y: line from $2 up 10
        line <--> from X.center to Y.center sprintf("%g", $3) above
}

A: box wid 80 ht 100
LinR(A.ne, A.se, A.ht)
LinU(A.nw, A.ne, A.wid)
.PE

Best wsihes,
Ted.

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Date: 03-Aug-07                                       Time: 17:19:54
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