Re: [NTG-context] shading with stitching functions
Mojca Miklavec wrote:
Hello,
I'm still trying to get shading in MetaPost as the one in the attached
eps file, but I don't manage to decipher the way how other shandings
are done.
There's a .tex file attached with a failed (hardcoded) example tries
but I don't know where to explore further.
well, 'where' coul dbe spec-tpd, or the pdftex manual -)
{\immediate\pdfobj stream attr
{/FunctionType 0
/Order 1
/BitsPerSample 8
/Domain [\gMPs1 \gMPs2]
/Decode [ 0 1 0 1 0 1 ]
/Range [ 0 1 0 1 0 1 ]
/Size [ 11 ]}
{00 00 00
51 00 96
71 02 f3
8c 07 f3
a1 10 96
b4 20 00
c6 37 00
d5 57 00
e4 83 00
f2 ba 00
ff ff 00}%
you can try to define a stream but then you also must maks sure that there is a
corresponding length key
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
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Re: [NTG-context] shading with stitching functions
Hi Mojca, this is also on my wishlist (and christmas is over). Currently I use several color gradients in a row, to simulate the same effect. But sadly this way is too viewer dependent (rendering is a matter of luck with every new version), not to mention the big size. So if there would be a cleaner solution, I would be a happy man. I'm willing to help, but I haven't looked into specials yet. Give me some time for reading and some more time for understanding... ;) Greetings, Peter Mojca Miklavec wrote: Hello, I'm still trying to get shading in MetaPost as the one in the attached eps file, but I don't manage to decipher the way how other shandings are done. There's a .tex file attached with a failed (hardcoded) example tries ... but I don't know where to explore further. I would appreciate any hints, Mojca ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] shading with stitching functions
On 12/27/06, Peter Rolf wrote:
Hi Mojca,
this is also on my wishlist (and christmas is over). Currently I use
several color gradients in a row, to simulate the same effect. But sadly
this way is too viewer dependent (rendering is a matter of luck with
every new version), not to mention the big size. So if there would be a
cleaner solution, I would be a happy man.
I'm willing to help, but I haven't looked into specials yet. Give me
some time for reading and some more time for understanding... ;)
With Hans's hint I finally got some kind of result. However, the
numbers in the stream seem to influence the colors, but not in the way
I want them to. I have to do some further explorations. Does anyone
know how to convert PS to PDF without compression?
Btw: TikZ supports such shadings, so if you don't necessary need a
metapost graphic, you can take a look at it as well. Here's an example
from the manual:
\usemodule[tikz]
\starttext
\pgfdeclarehorizontalshading{myshadingA}
{1cm}{rgb(0cm)=(1,0,0); color(2cm)=(green); color(4cm)=(blue)}
\pgfuseshading{myshadingA}
\stoptext
(I've just found out that it uses another aproach for sampled
functions, perhaps I'll have more chances to figure out how to
implement it that way.)
Mojca
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Re: [NTG-context] shading with stitching functions
Mojca Miklavec wrote:
On 12/27/06, Peter Rolf wrote:
Hi Mojca,
this is also on my wishlist (and christmas is over). Currently I use
several color gradients in a row, to simulate the same effect. But sadly
this way is too viewer dependent (rendering is a matter of luck with
every new version), not to mention the big size. So if there would be a
cleaner solution, I would be a happy man.
I'm willing to help, but I haven't looked into specials yet. Give me
some time for reading and some more time for understanding... ;)
With Hans's hint I finally got some kind of result. However, the
numbers in the stream seem to influence the colors, but not in the way
I want them to. I have to do some further explorations. Does anyone
know how to convert PS to PDF without compression?
I used
\pdfcompresslevel=0
with your example code.
Btw: TikZ supports such shadings, so if you don't necessary need a
metapost graphic, you can take a look at it as well. Here's an example
from the manual:
I need them as mp graphic, but it shouldn't hurt to look into that.
\usemodule[tikz]
\starttext
\pgfdeclarehorizontalshading{myshadingA}
{1cm}{rgb(0cm)=(1,0,0); color(2cm)=(green); color(4cm)=(blue)}
\pgfuseshading{myshadingA}
\stoptext
(I've just found out that it uses another aproach for sampled
functions, perhaps I'll have more chances to figure out how to
implement it that way.)
Mojca
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