[OpenJDK 2D-Dev] [OpenJDK Rasterizer] Path2d needRoom very slow for huge paths

[Andrea Aime]

On Fri, Apr 3, 2015 at 3:22 PM, Laurent Bourgès <bourges.laurent at gmail.com>
wrote:

> All of your comments are spot on (modulo the confusion over Pisces/Marlin
>> vs Path2D).  And you are right that 500 seems pretty lean to me.  800K path
>> segments seems to be a pretty large outlier, though, do we really see paths
>> that large other than via a test case?
>>
>
> Yes, my spiral test is insane !
> but it may happen sometimes in GIS to have huge polygons ~ 300 000
> segments.
>

Nah, your spiral is still in the sane zone. A few days ago someone on
GeoServer user list complained its 100MB shapefile
was slow to draw (and 100MB is not that much) so we checked, it contained
only 5 geometries, here is a query
returning the number of points from each of them:

> select st_npoints(geom) from puffer;
 st_npoints
------------
     183783
     538938
     709089
     933145
    3213841
    1127425

Want insane? Try 3 million points like in the second to last geometry :-)

Cheers
Andrea

PS: GeoServer will clip and simplify the  geometry before throwing it at
java2d, exactly because we know
java2d is not so good at handling this  kind of complexity


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Ing. Andrea Aime
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