From: Wolfgang Schuster <schuster.wolfgang@googlemail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: Henning Hraban Ramm <hraban@fiee.net>
Subject: Re: blurred shadow on images?
Date: Wed, 30 Jun 2010 22:47:58 +0200 [thread overview]
Message-ID: <4C2BAD7E.9090004@googlemail.com> (raw)
In-Reply-To: <2AB09333-C25D-4034-865C-B5A4557B6193@fiee.net>
Am 30.06.10 14:39, schrieb Henning Hraban Ramm:
> Am 2010-06-21 um 08:42 schrieb Taco Hoekwater:
>> Creating a semi-transparent backdrop with metapost is quite simple,
>> but I am not sure whether that works with cmyk, you'll have to try
>> yourself. Code goes something like this:
>
> For the records: This is, how I'll use it:
>
> \startuniqueMPgraphic{texthole}
> for dx = 0 upto 40:
> dy := dx;
> wa := 10 + dx;
> wb := \overlaywidth - dx - 10;
> ha := dy + 10;
> hb := \overlayheight - dy - 10;
> fill (wa,ha)--(wb,ha)--(wb,hb)--(wa,hb)--cycle
> withcolor transparent("normal", .04, black);
> endfor;
> \stopuniqueMPgraphic
>
> \defineoverlay[shaded][\useMPgraphic{texthole}]
>
> \starttext
>
> \rotate[rotation=12]{%
> \framed[height=50mm, width=50mm, frame=off, background=shaded,
> backgroundoffset=5mm, align=middle]%
> {\offset[x=1mm,y=-2mm]{\externalfigure[koe][width=50mm]}}%
> }
>
> \stoptext
>
> I'm glad I found \offset, because framed's offset parameter can't
> distinguish x and y offset.
> Positive offset moves right and down, negative offset moves just up -
> I guess that's a buglet.
You can change the boundingbox in the metapost graphic (the white
background was required
for the cow figure because it has a transparent background)
\startuniqueMPgraphic{shadow}
for dx = 0 upto 40:
dy := dx ;
wa := dx - 10 ;
wb := \overlaywidth - dx + 10 ;
ha := dy - 10 ;
hb := \overlayheight - dy + 10 ;
fill (wa,ha)--(wb,ha)--(wb,hb)--(wa,hb)--cycle
withcolor transparent("normal", .04, black);
endfor;
setbounds currentpicture to OverlayBox ;
\stopuniqueMPgraphic
\defineoverlay[shadow][\useMPgraphic{shadow}]
\starttext
\externalfigure[cow][width=50mm,background={shadow,color},backgroundcolor=white]
\stoptext
Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2010-06-30 20:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-20 13:37 Henning Hraban Ramm
2010-06-21 6:42 ` Taco Hoekwater
2010-06-22 20:58 ` Henning Hraban Ramm
2010-06-30 12:39 ` Henning Hraban Ramm
2010-06-30 20:47 ` Wolfgang Schuster [this message]
2010-07-01 8:58 ` Henning Hraban Ramm
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4C2BAD7E.9090004@googlemail.com \
--to=schuster.wolfgang@googlemail.com \
--cc=hraban@fiee.net \
--cc=ntg-context@ntg.nl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).