[Therion] How to draw water area with an island

[Bill Gee]

Thanks Bruce and Torquin!  The drawing method you proposed works for my 
need.

The discussion in the wiki about the order in which objects are dran is 
interesting.  It supports my habit both in the cave and in Therion of 
drawing the cave from the ground up.  I always draw the walls first, 
then floor details, then mid-level stuff like overhangs.  Last is 
ceiling features like steps, stalactites, soda straws etc.

The Wiki page talking about various PDF view programs needs some 
updating.  It does not mention Okular at all.  There was a time up to 
about 2 years ago when Okular (and anything else that depended on 
Poppler) was so slow that it was not usable.  Some of my maps would take 
10 to 15 minutes to render, and that much more again every time you 
changed the zoom level or scrolled around.

I mentioned it somewhere that got the attention of a Fedora developer 
named Albert Astals Cid.  He found a rather simple change in Poppler 
that dropped the rendering time for a Therion map by several orders of 
magnitude.  That change landed in production packages a few months 
later.  Okular still has some problems (water is not blue!) but mostly 
it works very well.  I think almost all PDF viewers in Linux use Poppler.

I have SumatraPDF on a virtual Windows 10 machine.  It also does not 
show water as blue.

===============
Bill Gee

On 11/14/24 12:22, Bruce Mutton wrote:
> Bill
> 
> Each pdf viewer renders differently. See lower down this page https:// 
> therion.speleo.sk/wiki/contrib:externalviewers#for_pdf_files <https:// 
> therion.speleo.sk/wiki/contrib:externalviewers#for_pdf_files>
> 
> This might be helpful. https://therion.speleo.sk/wiki/ 
> tips#drawing_order_how_to_draw_symbols_over_or_under_an_area <https:// 
> therion.speleo.sk/wiki/ 
> tips#drawing_order_how_to_draw_symbols_over_or_under_an_area>
> 
> Drawing islands has been discussed from time to time on the forum, but I 
> think the above pages and the idea you came up with about covers it.  
> Maybe an annular water body is an improvement on the two water bodies hack.
> 
> Adding an -outline in or out option to a line effectively makes it a 
> wall (the outside of a passage/scrap), so not what you are looking for.
> 
> Bruce
> 
> -----Original Message-----
> From: Therion <therion-bounces at speleo.sk> On Behalf Of Bill Gee
> Sent: Friday, 15 November 2024 04:24
> To: Therion Mail List <therion at speleo.sk>
> Subject: [Therion] How to draw water area with an island
> 
> Is there a way to draw a large area of water, then draw an exclusion or 
> island in the middle of it?
> 
> I drew some rocks in the middle of a water area.  They partially block 
> the water symbol - but not entirely.
> 
> I drew a border around the island area.  If I use either -outline in or 
> -outline out, then the entire area becomes opaque to everything.  It is 
> drawn like it is a column.  If I do not use the -outline option, then it 
> has no effect at all.
> 
> I also tried making the island border part of the water area.  No change.
> 
> One way I can think of to do this is to draw the water as two areas, 
> each of which goes half-way around the island.  It would work but seems 
> a bit complicated.
> 
> Suggestions?
> 
> --
> 
> ===============
> 
> Bill Gee
> 
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