Am Freitag, den 21.10.2011, 01:14 +0200 schrieb Paul Menzel: > Dear ConTeXt/MetaFun folks, > > > looking at the example for grid and functions in the MetaFun manual [1] > section 9.3 > > 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 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) ; > > I am confused how the resulting function is scaled correctly. The > resulting dimensions seem to be 10cm and 18 cm. So I guess the 2 cm mean > to shift it up some how. > > Could someone please explain to me how `xyscaled` works in this case > please. I though `xyscaled (αcm, ζcm)` would set the object/path to a > width of α cm and a height of ζ cm.
Looking up the definition of the macro `xyscaled` it is indeed just a
short version of `xscaled αcm yscaled ζcm`.
$ more mp-tool.mp
[…]
%D More robust:
% let normalscaled = scaled ;
% let normalxscaled = xscaled ;
% let normalyscaled = yscaled ;
%
% def scaled expr s = normalscaled (s) enddef ;
% def xscaled expr s = normalxscaled (s) enddef ;
% def yscaled expr s = normalyscaled (s) enddef ;
%D Shorter
primarydef p xyscaled q =
begingroup ; save qq ; pair qq ; qq = paired(q) ;
( p
if xpart qq<>0 : xscaled (xpart qq) fi
if ypart qq<>0 : yscaled (ypart qq) fi )
endgroup
enddef ;
[…]
I am still confused though what happens in the above example scaling the
path of the function.
Trying
\starttext
\startMPcode
draw fullsquare xscaled 10cm yscaled 2cm;
\stopMPcode
\stoptext
the resulting rectangle has the dimensions of 10 cm width and 2 cm
height but the path of the function above does not.
Thanks,
Paul
> [1] http://www.pragma-ade.com/general/manuals/metafun-s.pdf
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