[mapserver-users] hatch symbol edge effects when rendering tiles with TilecCache

[thomas bonfort]

there's ticket http://trac.osgeo.org/mapserver/ticket/3847 for this
issue. It should be implemented in the coming days/weeks.

regards,
thomas

On Thu, Nov 10, 2011 at 09:24, SQ9MEV <groups at sq9mev.info> wrote:
> Hi all!
>
> Working on my first webgis app, I use mapserver with python mapscript to
> generate WMS tiles. I use metatiling (5x5), but
>
> I'm struggling with edge effects when using hatch filled polygons - hatch
> pattern is moved by some offset on neighbouring tiles (I use metatiling, but
> it cannot resolve my problem, as polygons share several metatiles
> sometimes).
>
> The problem is somehow mentioned in MS RFC 45:
> http://mapserver.org/development/rfc/ms-rfc-45.html?highlight=hatch#polygon-fill-symbols
>
> but not a word about how to get rid of the edge effect.
>
> Any hints how to achieve repeating hatching accros many tiles?
>
> I think the pattern should have stable geographical origin as it's mentioned
> or at least "stable tile origin".
>
> I do not need continous hatch pattern, so as for now i use workaround:
>
> SYMBOL 'hatch-test'
> PATTERN 2 3 1 4 2 4 2 3 2 END
>
> The gaps are more or lesl random, so edge effect is not so visible as with
> continous hatch, but it is.
>
> Anyway, my map looks reasonable, so thanks guys for your work on MapServer.
>
> --
> Bart
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