Re: withshade (mlib)

[Peter Rolf <indiego@gmx.net>]

Peter Rolf schrieb:
> Hans Hagen schrieb:
>> Peter Rolf wrote:
>>> Hi,
>>>
>>> there are some problems in combination with the 'withshade' operator in 
>>> mlib.
>>>
>>> this must be patched in mp-mlib.mp (':=' instead of '='; too much lua ;)
>> indeed
>>
>>
>>> i still get an error after this patch, because '_defined_cs_' is not 
>>> increased somehow (donno why, not my day; cleared mem, remade formats). 
>>> _defined_cs_pre_0 is of course undefined.
>> did you delete the cont-en-metafun format in the cache?
>>
> yes, several times. if it works for you, i just have bad luck. as said: 
> not my day..

don't know if i'm still out of luck or if it's a general problem
(luatex trunc, context beta 03.05.2008).

there was also some 'hide' missing, but anyway i still get the same 
error. code looks ok to me, but i'm no experienced mp programmer. maybe 
a luatex/mplib problem with vardef grouping? i'm puzzled.


vardef define_linear_shade (expr a, b, ca, cb) =
     hide (_defined_cs_ := _defined_cs_ + 1 ;
         _defined_cs_pre_ [_defined_cs_] := "ls" ;
         _defined_cs_post_[_defined_cs_] := "0 1 " & decimal shadefactor 
& " " &
             colordecimals ca & " " & ddecimal (a shifted shadeoffset) & " "
             colordecimals cb & " " & ddecimal (b shifted shadeoffset) )
     _defined_cs_
enddef ;

same for define_circular_shade...

% testfile ---------------------------------
% engine=luatex
\setupcolors[state=start]
\starttext

\null
\startMPcode
     path p;
     p:= unitsquare xyscaled(10cm,1cm);
     fill p withshade
     define_linear_shade(p,1,red,blue);
\stopMPcode

\stoptext

% results in --------------------------------
[..]
systems        : begin file shade at line 3
mplib          : making format: metafun.mp, name: 
r:/tex/luatex-cache/context/be74c9ce1715b7e02ccf1b16a39c2fc2/formats/cont-en-metafun.mem
mplib          : loading format: metafun.mp, name: 
r:/tex/luatex-cache/context/be74c9ce1715b7e02ccf1b16a39c2fc2/formats/cont-en-metafun.mem
report >> mp terminal: ! Missing argument to withshade.
<to be read again>
                    define_linear_shade
<*> ...,1cm); fill p withshade define_linear_shade
                                                   (p,1,red,blue); ;
 >> unknown string _defined_cs_pre_0
! Improper type.
<to be read again>
                    withpostscript
withshade->...fined_cs_pre_[(EXPR0)]withpostscript
 
._defined_cs_post_[(EXPR0)]
<to be read again>
                    define_linear_shade
<*> ...,1cm); fill p withshade define_linear_shade
                                                   (p,1,red,blue); ;
 >> _defined_cs_post_0define_linear_shade
! Improper type.
<to be read again>
                    (
<*> ...1cm); fill p withshade define_linear_shade(
                                                   p,1,red,blue); ;
! Extra tokens will be flushed.
<to be read again>
                    (
<*> ...1cm); fill p withshade define_linear_shade(
                                                   p,1,red,blue); ;

report >> mp error: unknown, no error, terminal or log messages
fonts          : resetting map file list
[..]


any help welcome.

peter
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