On Thu, 6 Dec 2012, Peter Rolf wrote:
Hi all,
a first version of the 'drops'-module (MkIV only) is available at
https://www.wuala.com/indiego/public/ConTeXt/drops/?key=caiCGLasLFmJ
Taken from the included documentation..
[..]
'drops' is a small extension for ConTeXt, that allows you to add drop
shadows to rectangular regions (so called boxshadows). A working
installation of ImageMagick (IM) is required to create the shadow
graphics. The supported color spaces are CMYK, RGB and Gray, the file
formats are limited to PNG and JPG.
[..]
Read the manual for detailed information.
Nice.
The attached example is just a small test file for the 'rotation'
parameter (a compensation for the object rotation, so that the shadow
stays at the given direction). You will find other examples in the
documentation and there is also a 'pile' example with the complete
source. The 'presets' pdf contains the predefined setups for different
shadow (or frame) types and it's source is a good starting point for
your own experiments.
This is a first draft, but most things work quite stable. If you want to
help, test as much as possible. :-)
*You need a recent version of ImageMagick for this module.*
I always thought that shadows were possible to do in PDF
(after all TikZ does it using some type of PDF primitives). Since you are
the PDF expert, I am interested in knowing why you choose to go the
ImageMagic route.
In terms of interface, wouldn't it be better if this somehow interfaced
with the background/overlay mechanism. For example,
\definedropshadow[identifier][...options...]
which will define an overlay that will call ImageMagic with appropriate
parameters (and caching the results if speed is a concern),
and then
\externalfigure[name][background=identifier]
should draw a dropped shadow around the image
Aditya
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