metaobj and transparent colors with \MPcolor
Hi, 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})"; 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
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? 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})";
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
On Fri, Jul 23, 2004 at 11:45:32AM +0200, 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.
The graphics won't compile without metaobj, which is a very nice macro package for metapost, available at CTAN/graphics/metapost/contrib/macros/metaobj/
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?
During a texexec run, inline MP graphics are automatically generated and converted in case of PDF output, provided that you have configured your texexec to do so. Definitions enclosed in \startMPenvironment ... \stopMPenvironment are made available not only inside MP graphics, but also for the main document by the [global] option. In this case, I use it to maintainn color consistency between metapost and tex. Without \startMPenvironment, the color definition would be available in context only, not for inline graphics. -- Eckhart
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.
The graphics won't compile without metaobj, which is a very nice macro package for metapost, available at CTAN/graphics/metapost/contrib/macros/metaobj/
I, of course, checked if the package metaobj is installed and loaded. Perhaps my is too old (v0.83)? I had a look to metaobj manual and it is good to know about it. Thank you. Vit Zyka
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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On Fri, Jul 23, 2004 at 11:38:28AM -0700, Hans Hagen Outside wrote:
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) ;
Here is my current file, which just gives a white background in the box. \setupcolors[state=start] \setupbackgrounds[page][background=color,backgroundcolor=red] \definecolor[Transparent][r=0,g=1,b=1,t=0,a=normal] \startreusableMPgraphic{test} input metaobj; color t; t:=\MPcolor{Transparent}; setObjectDefaultOption("Box")("fillcolor")(t); newBox.test(btex Transparent? etex) "filled(true)"; Obj(test).c=origin; drawObj(test); \stopreusableMPgraphic \starttext \reuseMPgraphic{test} \stoptext Experimenting with default degrees of transparency, e.g. t=0.5, I have noticed that the object is indeed filled using the Transparent color. The problem seems to be that all objects in metaobj are filled using a non-transparent white by default. Subsequent filling with a completely transparent color then of course gives just white. Well, I just want to see my normal page background through the object. Can I achieve this? -- Eckhart
Eckhart Guthöhrlein wrote:
The problem seems to be that all objects in metaobj are filled using a non-transparent white by default. Subsequent filling with a completely transparent color then of course gives just white.
ah, maybe denis uses the metapost 'backgroundcolor' which is white; i'd say: never use that ! just don't fill! btw, i recently introduced nocolor, being (-1,-1,-1) Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
On Fri, Jul 23, 2004 at 09:53:22AM +0200, Eckhart Guthöhrlein wrote:
Hi,
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:
Hi, I have never considered transparency in metaobj, and each part of an object is merely drawn, in some order depending on that object, and with some (opaque) color. It seems some serious surgery would be needed to seamlessly add transparency handling. It can certainly be done, be it only by working on an object structure, but I don't see a quick fix. Denis Roegel
Denis Roegel wrote:
On Fri, Jul 23, 2004 at 09:53:22AM +0200, Eckhart Guthöhrlein wrote:
Hi,
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:
Hi,
I have never considered transparency in metaobj, and each part of an object is merely drawn, in some order depending on that object, and with some (opaque) color. It seems some serious surgery would be needed to seamlessly add transparency handling. It can certainly be done, be it only by working on an object structure, but I don't see a quick fix.
no, transparency is handled by the colors themselves so if metaobj can carry along a color it's should work ok Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
participants (5)
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Denis Roegel -
Eckhart Guthöhrlein -
Hans Hagen -
Hans Hagen Outside
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Vit Zyka