* what is nxy?
@ 2000-10-18 20:41 Denis B. Roegel
2000-10-19 9:10 ` Hans Hagen
0 siblings, 1 reply; 2+ messages in thread
From: Denis B. Roegel @ 2000-10-18 20:41 UTC (permalink / raw)
Cc: Denis B. Roegel
If I go back to the example of an earlier question of mine,
I see that
1) I don't understand what `nxy' is; as far as I can see,
it is not explained in the metafun manual;
2) I don't understand why the connection between the first
and the second word goes from center to center,
and this may have something to do with 1).
Thanks!
Denis
\starttext
\startMPpositiongraphic{mypos:circle}
initialize_box(\MPpos{\MPvar{self}});
path p; p:=llxy..lrxy..urxy..ulxy..cycle;
pickup pencircle scaled 1pt;
fill p withcolor .800white;
draw p withcolor .625yellow;
anchor_box(\MPanchor{\MPvar{self}});
\stopMPpositiongraphic
\startMPpositiongraphic{mypos:line}
path pa, pb, pab ; numeric na, nb;
initialize_box(\MPpos{\MPvar{from}});
na := nxy ; pa := llxy..lrxy..urxy..ulxy..cycle ;
initialize_box(\MPpos{\MPvar{to}});
nb := nxy ; pb := llxy..lrxy..urxy..ulxy..cycle ;
if na=nb :
pab := center pa -- center pb ;
pab := pab cutbefore (pab intersectionpoint pa) ;
pab := pab cutafter (pab intersectionpoint pb) ;
pickup pencircle scaled 1pt;
drawarrow pab withcolor .625yellow;
anchor_box(\MPanchor{\MPvar{from}});
fi;
\stopMPpositiongraphic
\startpositionoverlay{backgraphics}
\setMPpositiongraphic{X-1}{mypos:circle}
\setMPpositiongraphic{X-2}{mypos:circle}
\setMPpositiongraphic{X-3}{mypos:circle}
\stoppositionoverlay
\startpositionoverlay{foregraphics}
\setMPpositiongraphic{X-1}{mypos:line}{to=X-2}
\setMPpositiongraphic{X-2}{mypos:line}{to=X-3}
\stoppositionoverlay
\defineoverlay [foregraphics] [\positionoverlay{foregraphics}]
\defineoverlay [backgraphics] [\positionoverlay{backgraphics}]
\setupbackgrounds
[page]
[background={backgraphics,foreground,foregraphics}]
In a previous section we saw that some \hpos {X-1} {words} were
\hpos {X-2} {circled} and connected by an \hpos {X-3} {arrow}.
As with most things in \CONTEXT, marking these words is separated
from declaring what to do with those words.
\stoptext
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: what is nxy?
2000-10-18 20:41 what is nxy? Denis B. Roegel
@ 2000-10-19 9:10 ` Hans Hagen
0 siblings, 0 replies; 2+ messages in thread
From: Hans Hagen @ 2000-10-19 9:10 UTC (permalink / raw)
Cc: ntg-context, Denis B. Roegel
At 10:41 PM 10/18/00 +0200, Denis B. Roegel wrote:
>If I go back to the example of an earlier question of mine,
>I see that
>
> 1) I don't understand what `nxy' is; as far as I can see,
> it is not explained in the metafun manual;
> 2) I don't understand why the connection between the first
> and the second word goes from center to center,
> and this may have something to do with 1).
>\startMPpositiongraphic{mypos:line}
> path pa, pb, pab ; numeric na, nb;
> initialize_box(\MPpos{\MPvar{from}});
> na := nxy ; pa := llxy..lrxy..urxy..ulxy..cycle ;
The initialize_box macro sets a bunch of vars [still to be explained in
this chapter btw] and nxy is the pagenumber associates with the pos.
> initialize_box(\MPpos{\MPvar{to}});
> nb := nxy ; pb := llxy..lrxy..urxy..ulxy..cycle ;
> if na=nb :
So, we only draw a graphic when both positions are on the same page. [i do
have an alternative that handles multiple pages]. In the background graphic
that goes behind the text [area] this page number info is used to let the
background cross the page.
Concerning (2): the "center" directive makes that happen
Hans
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