On Tue, 29 Dec 2020, Garulfo wrote:
> Which process would you advice to add « drop shadows » to any kind of metafun
> / metapost figures like:
> picture p;
> p := textext("MetaPost is fun!") shifted (10cm,10cm);
>
> My current understanding of the required steps :
>
>
> 1- fill p with the shadow color
>
> 2- write it to an external metapost file (with savebuffer ?) ready for png
> export (outputformat := "png »;)
>
> 3- with lua, os.execute, and imagemagick prepare the shadow
> - extent the png file with a transparent background, to have room for
> blurring
> - blur it
>
> 4- import this png in context / Metapost (externalfigure), and center it with
> p figure
>
> 5- shift it according to the desired shadows distance and angle
>
> 6- apply the initial bounding box of p to the shadow, draw the shadow, draw
> the p picture
>
>
> Actually, all this seems long and tedious, and contrasts with the already
> existing links between MetaPost / MetaFun and cairo + libpng.
There was a drops module by Peter Rolf, which provides exactly these features:
https://mailman.ntg.nl/pipermail/ntg-context/2016/084242.html
It is not part of modules.contextgarden.net and the url in the previous post is
no longer valid.
I am CC:ing Peter and perhaps he can point to the updated location for the
module.
Aditya
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