[NTG-context] Bounding box of picture returned by textext() in METAPOST

[Gerben Wierda]

Nobody?

> On 4 Apr 2020, at 22:58, Gerben Wierda <gerben.wierda at rna.nl> wrote:
> 
> I have this METAPOST macro:
> 
> vardef makeTeXLabel( expr w, h, name) =
>   if debugProgram or debugLabels: show "NAME makeTeXLabel:", name, tostring 0.8w, tostring 0.8h; fi
>   save p; picture p;
>   p := textext( "\startframedtext[middle]" &
>     "[align=middle,frame=on" &
>     ",width=" & tostring 0.8w & "bp" &
>     ",height=" & tostring 0.8h & "bp]" &
>     name & "\stopframedtext");
>   save b; path b; b := boundingbox p;
>   save dim; pair dim;
>   dim := (urcorner b) - (llcorner b);
>   save width, height; numeric width, height;
>   width := xpart dim;
>   height = ypart dim;
>   if debugLabels: show "PLACE:", w, h, width, height; fi
>   if (width > 0.8w) or (height > 0.8h):
>     if (width > height):
>       if debugLabels: show "XSCALING:", (0.8w/width,0.8w/width); fi
>       p:= p xyscaled (0.8w/width,0.8w/width);
>     else:
>       if debugLabels: show "YSCALING:", (0.8h/height,0.8h/height); fi
>       p:= p xyscaled (0.8h/height,0.8h/height);
>     fi
>   fi
>   p
> enddef;
> 
> It gets called with w=133 and h=53 (I am working in METAPOST native units, so bp)
> 
> So, the textext() command gets something like 106bp x 42bp, which seems to be the case:
> 
> metapost log    > >> "NAME makeTeXLabel:"
> metapost log    > >> "My 'Application' Function"
> metapost log    > >> "106.40000000000001"
> cld             > tex > w : - : \MPLIBsetNtextX{1}{\startframedtext [middle][align=middle,frame=on,width=106.40000000000001bp,height=42.400000000000006bp]My 'Application' Function\stopframedtext }
> cld             > tex > F : - : \startblankhandling
> cld             > tex > w : - : \setblankcategory{6}
> cld             > tex > F : - : \flushblankhandling
> cld             > tex > F : - : \stopblankhandling
> metapost log    > >> "42.400000000000006"
> metapost log    > >> "PLACE:"
> metapost log    > >> 133
> metapost log    > >> 53
> metapost log    > >> 511.08659908200002
> metapost log    > >> 42.399990514000002
> 
> But the bounding box is 511bp wide (something like 7in or 18cm, probably textwidth) but I’m asking for a box that is 106bp wide.
> 
> What happens here? And how do I get it right? 
> 
> G
> 
> 
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