From: Marco Patzer <lists@homerow.info>
To: ntg-context@ntg.nl
Subject: Re: Shading to transparent using withshademethod
Date: Thu, 28 Jan 2016 19:09:50 +0100 [thread overview]
Message-ID: <20160128190950.5cec1cf9@homerow> (raw)
In-Reply-To: <56AA4F44.4060709@wxs.nl>
On Thu, 28 Jan 2016 18:26:28 +0100
Hans Hagen <pragma@wxs.nl> wrote:
> On 1/28/2016 3:34 PM, Marco Patzer wrote:
> > On Thu, 28 Jan 2016 14:45:13 +0100
> > Hans Hagen <pragma@wxs.nl> wrote:
> >
> >> On 1/28/2016 1:53 PM, Marco Patzer wrote:
> >>> On Thu, 28 Jan 2016 12:33:39 +0100
> >>> Hans Hagen <pragma@wxs.nl> wrote:
> >>>
> >>>>>>> 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?
> >>>>
> >>>> that isn't how shading works,
> >>>
> >>> …any longer. I just confirmed that it used to work on an older
> >>> installation. Just sayin'
> >>
> >> are you sure?
> >
> > See the attached example. The shade seems to go from black to fully
> > transparent. So regardless of the background colour the shade looks
> > fine. I can't replicate this with the new mechanism.
>
> a matter of choosing the colors
Indeed, if you choose the colours wisely you don't necessarily need
transparency (at least in my use case).
> \unprotect
>
> \def\MPcoloronly#1%
> {\clf_mpcolor
> \attribute\colormodelattribute
> \colo_helpers_inherited_current_ca{#1} %
> \zerocount}
>
> \def\MPtransparency#1%
> {\clf_mpcolor
> \zerocount
> \zerocount
> \colo_helpers_inherited_current_ta{#1} }
>
> \protect
>
> \startbuffer
> \definecolor[tex:bg][s=.85]
> \definecolor[mp:fg] [s=.85,t=1,a=1]
> \setupbackgrounds [page] [background=color,backgroundcolor=tex:bg]
> \starttext
> \contextversion\crlf
> \startMPcode
> % lightgray = 0.85white;
^^^ That looks more like Tex's lightgray
> fill fullsquare xyscaled (12cm, 12cm)
> withshademethod "linear"
> withshadevector (-1,0)
> % withshadecolors (black,lightgray)
> % withtransparency (1,1)
> withshadecolors (black,\MPcoloronly{mp:fg})
> withtransparency \MPtransparencyonly{mp:fg}
^^^^^ Typo or new feature?
looks like \MPtransparency
should be sufficient
> ;
> \stopMPcode
> \stoptext
> \stopbuffer
>
> \starttext
> \typebuffer\getbuffer
> \stoptext
I'll play with the code in the new beta.
Marco
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next prev parent reply other threads:[~2016-01-28 18:09 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
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 [this message]
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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