[NTG-context] metaobj and transparent colors with \MPcolor

Hans Hagen Outside pragma at wxs.nl
Fri Jul 23 20:38:28 CEST 2004


Vit Zyka wrote:

> Sorry, I can not reproduce your example. I get only red page with 
> black page number in header. No white box. And I do not known metaobj 
> macro.
>
> But I have a question. It is really needed to surround \definecolor by 
> \startMPenvironment? Since \definecolor has to result to \pdfobj and 
> \pdfliteral (pdftex primitives) and propagation to mpost (which is EPS 
> not PDF generator) has no sence. Only reference to color is needed and 
> it is done via \MPcolor. Am I right?

only things that are needed in btex ... etex or textext(..) need to be 
put into \startMPenvironment, so in your case the color def can stay 
outside the env.

> Vit Zyka
>
>> I try to achieve transparently filled objects using the metaobj package.
>> However, transparency is ignored completely in the output, I just get a
>> normal white. Here is my test file:
>>
>> \setupcolors[state=start]
>> \setupbackgrounds[page][background=color,backgroundcolor=red]
>>
>> \startMPenvironment[global]
>>   \definecolor[Durchsichtig][r=1.0,g=1.0,b=1.0,t=0.0,a=normal]
>> \stopMPenvironment
>>
>> \startreusableMPgraphic{test}
>>     input metaobj;
>>     setObjectDefaultOption("Box")("fillcolor")(\MPcolor{Durchsichtig});
>>     newBox.test(btex Transparent? etex) "filled(true)";
>>     Obj(test).c=origin;
>>     drawObj(test);
>> \stopreusableMPgraphic
>>
>> \starttext
>>     \reuseMPgraphic{test}
>> \stoptext
>>
>>
>> If I use the fillcolor as an argument to the object
>>
>>     newBox.test(btex Transparent? etex) "filled(true)"
>>         "fillcolor(\MPcolor{Durchsichtig})";
>
can you try
                 fillcolor \MPcolor{...}

or maybe

color xxxx ; xxxx := \MPcolor{...} ; fillcolor(xxxx) ;

>>
>> I get error messages from the mpost run. So it seems that metaobj and
>> \MPcolor don't like each other.
>> Any ideas how to circumvent this problem?
>>
>> Regards,
>> Eckhart
>
>
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