From: Marco Patzer <lists@homerow.info>
To: ntg-context@ntg.nl
Subject: Re: Shading to transparent using withshademethod
Date: Thu, 28 Jan 2016 11:45:53 +0100 [thread overview]
Message-ID: <20160128114553.3e4fb3a7@homerow> (raw)
In-Reply-To: <56A9D4AC.6030100@wxs.nl>
On Thu, 28 Jan 2016 09:43:24 +0100
Hans Hagen <pragma@wxs.nl> wrote:
> On 1/27/2016 10:05 PM, Marco Patzer wrote:
> > The new code appears to work in general, but only if no shading to
> > transparent is being used:
> >
> > \definecolor [trans] [a=multiply, t=.5, s=.5]
> > \starttext
> > \startMPcode
> > % works
> > fill fullcircle scaled 10cm withcolor \MPcolor{trans};
> >
> > fill fullsquare xyscaled (15cm, 15cm)
> > withshademethod "linear"
> > withshadevector (0,1)
> > % works
> > withshadecolors (red,\MPcolor{blue})
> > % fails
> > %% withshadecolors (red,\MPcolor{trans})
> > ;
> > \stopMPcode
> > \stoptext
> >
> > How to make transparent shadings work with the new mechanism?
>
> withtransparency (1,.5)
However, this makes the entire shade transparent. How to shade from
one colour to transparent using withtransparency to achieve an
effect like in the example below?
\definecolor [trans] [a=multiply, t=0]
\setupbackgrounds [page] [background=color, backgroundcolor=lightgray]
\starttext
\startMPcode
fill fullsquare xyscaled (15cm, 15cm)
withshademethod "linear"
withshadevector (0, 1)
%% colour doens't match
%% withshadecolors (red, lightgray)
%% output is ok with \MPcolor
withshadecolors (red, \MPcolor{lightgray})
%% ??
%% withtransparency (1, .5)
;
\stopMPcode
\stoptext
Furthermore, why do the tex and MP colours differ? Wouldn't it make
sense to use the same colour definitions? Or was that intentional?
Marco
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next prev parent reply other threads:[~2016-01-28 10:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-27 21:05 Marco Patzer
2016-01-28 8:43 ` Hans Hagen
2016-01-28 10:45 ` Marco Patzer [this message]
2016-01-28 11:33 ` Hans Hagen
2016-01-28 12:53 ` Marco Patzer
2016-01-28 13:45 ` Hans Hagen
2016-01-28 14:34 ` Marco Patzer
2016-01-28 17:26 ` Hans Hagen
2016-01-28 18:09 ` Marco Patzer
2016-01-28 11:29 ` Hans Hagen
2016-01-28 13:02 ` Marco Patzer
2016-01-28 15:16 ` Hans Hagen
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