Re: Passing text to Metapost functions

[Willi Egger <w.egger@boede.nl>]

Hi David,

Put the "x" into a variable:

\setMPtext{1}{x}

you can define the \stetMPtext within the \starttext \stoptext or outside

Call
create_axes(xmin,xmax,ymin,ymax,ux,uy)(\MPbetex{1});
 

Willi

David Arnold wrote:

> Hans,
>
> I've tried various things without much success. I cannot seem to  
> access the contents of xlbl below.
>
> Is this approach ever going to work?
>
> Note: I am trying to pass the string "x" to the parameter xlbl.
>
> %output=pdf
>
> \setupcolors[state=start]
>
> \definecolor[gridlines][s=0.7]
>
> \startMPinclusions
>
> color gridlines; gridlines:=\MPcolor{gridlines};
>
> vardef create_grid(expr xxmin,xxmax,xxscl,yymin,yymax,yyscl,uux,uuy)=
>   for k=xxmin step xxscl until xxmax:
>     draw (xmin*uux,k*uuy)--(xmax*uux,k*uuy) withcolor \MPcolor 
> {gridlines};
>     draw (k*uux,ymin*uuy)--(k*uux,ymax*uuy) withcolor \MPcolor 
> {gridlines};
>   endfor;
> enddef;
>
> vardef create_axes (expr xxmin,xxmax,yymin,yymax,uux,uuy) (text xlbl)  =
>   drawdblarrow (1.05*xxmin*uux,0)--(1.05*xxmax*uux,0);
>   draw textext.origin(\MPstring{xlbl});
>   drawdblarrow (0,1.05*yymin*uuy)--(0,1.05*yymax*uuy);
> enddef;
>
> \stopMPinclusions
>
>
> \starttext
>
> \startMPpage
>
> %initialize window parameters
> numeric xmin, xmax, xscl, ymin, ymax, yscl;
> xmin:=-5;
> xmax:=5;
> xscl:=1;
> ymin:=-5;
> ymax:=5;
> yscl:=1;
>
> %initialize scale
> numeric ux, uy;
> (xmax-xmin)*ux=4in; (ymax-ymin)*uy=3in;
>
> %create the grid
> create_grid(xmin,xmax,xscl,ymin,ymax,yscl,ux,uy);
>
> %create the axes
> create_axes(xmin,xmax,ymin,ymax,ux,uy)(x);
>
> \stopMPpage
>
> \stoptext
>
> %%% Local Variables:
> %%% mode: conTeXt-en
> %%% End:
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