From: Hans Hagen <pragma@wxs.nl>
To: ntg-context@ntg.nl
Subject: Re: Shading to transparent using withshademethod
Date: Thu, 28 Jan 2016 18:26:28 +0100 [thread overview]
Message-ID: <56AA4F44.4060709@wxs.nl> (raw)
In-Reply-To: <20160128153444.2de05353@homerow>
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
\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;
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}
;
\stopMPcode
\stoptext
\stopbuffer
\starttext
\typebuffer\getbuffer
\stoptext
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Hans Hagen | PRAGMA ADE
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next prev parent reply other threads:[~2016-01-28 17:26 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 [this message]
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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