A question on drawing functions in MetaFun

[Jin-Hwan Cho <chofchof@ktug.or.kr>]

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I tried to generate "Figure 9.2 An example of a graphic with labels
along the axes." in metafun-p.pdf (p.209), but could get only graphics
without labels.

I used the codes in the page 208 as follows (see the attached file)

\startMPpage
StartPage ;
... codes in p.208 here ...
StopPage ;
\stopMPpage

In this case, the generated MPS file (ch93-1-mpgraph.1) had the bounding
box (0, 0, 420, 596).

When I used \startuseMPgraphic instead of \startMPpage, the generated
MPS file had the different bounding box (-47, -17, 300, 575), and I
could see the right one.

Please tell me what I missed.

Best, ChoF.
~~~~~~~~~~~~~~~~~~~~~~~~~   ***
| Cho, Jin-Hwan == ChoF |   ^ ^
~~~~~~~~~~~~~~~~~~~~~~~~~~~  o
| Dept. of Mathematics    | ---
| The University of Suwon |  |
~~~~~~~~~~~~~~~~~~~~~~~~~~~  |
| Korean TeX Users Group  |  |
| http://www.ktug.or.kr   |  |
~~~~~~~~~~~~~~~~~~~~~~~~~~~  |
| chofchof@ktug.or.kr |     ***
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


[-- Attachment #2: ch93-1.tex --]
[-- Type: application/octet-stream, Size: 1202 bytes --]

% Chapter 9. Functions
%
% 9.3 Drawing functions
\setupcolors [state=start]

\starttext

  % If \startMPpage is used, the generating mps graphic does not have
  % accurate bounding box. Why?

  %\startuseMPgraphic{function demo}
  \startMPpage 
    StartPage ; 
      drawoptions(withpen pencircle scaled .25pt withcolor .5white) ; 

      draw hlingrid (0, 20, .2, 20cm, 10cm) ; 
      draw vloggrid (0, 10, .5, 10cm, 20cm) ; 

      drawoptions(withpen pencircle scaled .50pt) ; 

      draw hlingrid (0, 20, 1, 20cm, 10cm) ; 
      draw vloggrid (0, 10, 1, 10cm, 20cm) ; 

      fmt_pictures := false ;     % use the TeX as formatting engine 
      textextoffset := ExHeight ; % a variable set by ConTeXt 

      draw hlintext.lft(0, 20, 5, 20cm, "@3e") ; 
      draw vlogtext.bot(0, 10, 9, 10cm, "@3e") ; 

      draw 
        function(1,"log(x)","x",1,10,1) xyscaled (10cm,2cm) 
        withpen pencircle scaled 5mm withcolor transparent(1,.5,yellow) ; 
      draw 
        function(2,".5log(x)","x",1,10,1) xyscaled (10cm,2cm) 
        withpen pencircle scaled 5mm withcolor transparent(1,.5,blue) ; 
    StopPage ; 
  \stopMPpage 
  %\stopuseMPgraphic

  \useMPgraphic{function demo}

\stoptext

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