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From: Garulfo <garulfo@azules.eu>
To: ntg-context@ntg.nl
Subject: drop shadows with metapost/ metafun
Date: Tue, 29 Dec 2020 22:56:40 +0100	[thread overview]
Message-ID: <CFAD7E2B-C80E-4412-8412-20BCD98282A9@azules.eu> (raw)


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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.

Thanks again for your help.

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             reply	other threads:[~2020-12-29 21:56 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-29 21:56 Garulfo [this message]
2021-01-01  7:09 ` Aditya Mahajan
2021-01-01  7:15   ` Aditya Mahajan
2021-01-02 10:38 ` Henning Hraban Ramm

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