Re[3]: Backgrounds

[Giuseppe Bilotta <gip.bilotta@iol.it>]

Thursday, April 10, 2003 Hans Hagen wrote:

HH> \startuseMPgraphic{mpos:par:columnset}
HH>     path q ; picture r ; color framecolor, backgroundcolor ;
HH>     cornerradius := 5pt ; offset := 7.5pt ;
HH>     framecolor := red ; framethickness := 2pt ;
HH>     backgroundcolor := lightgray ;
HH>     for i := 1 upto nofmultipars :
HH>       multipars[i] := multipars[i] enlarged offset ;
HH>       if multilocs[i] = 1 : % top
HH>         q := multipars[i] bottomenlarged (4cornerradius) ;
HH>       elseif multilocs[i] = 2 :
HH>         q := multipars[i] bottomenlarged (4cornerradius) ;
HH>         q := q topenlarged (4cornerradius) ;
HH>       else:
HH>         q := multipars[i] topenlarged (4cornerradius) ;
HH>       fi ;
HH>       q := q smoothed (2cornerradius) ;
HH>       r := image
HH>         ( fill q withcolor backgroundcolor ;
HH>           draw q withcolor framecolor
HH>             withpen pencircle scaled framethickness ; ) ;
HH>       clip r to boundingbox multipars[i] ;
HH>       addto currentpicture also r ;
HH>     endfor ;
HH> \stopuseMPgraphic

HH> watch the usage of "enlarged" and the "smoothed"

I think I see; instead of drawing only the needed parts you draw
the whole frame and then cut the unwanted parts off. Is this more
efficient than drawing only the needed parts?

And what about the way to determine when there is a split or not?
Could you please put a boolean that reveals it, in the next beta?
(even if I'm still convinced that using a multilocs of 0 would be
enough ... ok, it would break backwards compatibility, but how
many people are using this mechanism already?)

-- 
Giuseppe "Oblomov" Bilotta