[NTG-context] text flowing around images

Henning Hraban Ramm texml at fiee.net
Wed Feb 6 10:03:13 CET 2019


Am 2019-02-06 um 00:19 schrieb Aditya Mahajan <adityam at umich.edu>:

> On Tue, 5 Feb 2019, Wolfgang Schuster wrote:
> 
>>>> Am 2019-02-04 um 11:10 schrieb Henning Hraban Ramm <texml at fiee.net>:
>>>> 
>>>>> Ahoi,
>>>>> 
>>>>> in my current project I must include a bunch of illustrations in my 
>> layout, and the text should flow around their irregular shapes (side placement in single text column only).
>>>>> I got the pictures as TIFFs with alpha channel, but of course I can 
>> change that.
>>>>> 
>>>>> I’m quite sure I remember that it was possible to let text flow around 
>> shapes somehow, but I can’t find documentation or a sample.
>>>>> I’d be thankful for hints.
>>>>> 
>> The metafun manual should have a few examples.
>> 
> See https://tex.stackexchange.com/a/32308/323 which is based on an example in the metafun manual.

Thank you all!

I guess I can reduce the flow cases to <10 and use \parshape directly; thinking in lines looks a bit easier than the MetaPost way.

Calculating the MP path from the TIFF alpha channel would be interesting, but is way above my head.

I guess it would work like:
* preprocessing:
  - find the outer contour of the image (after some threshold value of color value or alpha channel)
  - simplify and vectorize that (I remember there were different OS tools/libraries used with FontForge or Inkscape)
  - convert this outline (SVG or EPS I guess) into MP
* within the ConTeXt run:
  - place the (scaled) picture
  - preliminary page/paragraph breaking to find where there might be overlaps
  - calculate the fitting paragraph shape (rectangle minus overlapping part of the scaled outline)
  - probably some new line/paragraph breaking?


Greetlings, Hraban
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