[geos-devel] Perhaps a stupid question about polygons...

Martin Davis mbdavis at VividSolutions.com
Mon Jun 28 18:26:14 EDT 2004

Yup, absolutely.  

This shouldn't be too much of a showstopper tho.  It's easy to write
code to detect which is the outer shell.  I think the easiest algorithm
would just be to take the ring with the largest x or y extent.

Martin Davis, Senior Technical Architect
Vivid Solutions Inc.      www.vividsolutions.com
Suite #1A-2328 Government Street Victoria, B.C. V8T 5G5
Phone: (250) 385 6040 - Local 308 Fax: (250) 385 6046

> -----Original Message-----
> From: Stephen Lime [mailto:sdlime at comcast.net] 
> Sent: June 28, 2004 3:20 PM
> To: geos-devel at geos.refractions.net
> Subject: [geos-devel] Perhaps a stupid question about polygons...
> Hi all: The recent thread about polygons and holes got me thinking.  
> Does building polygons in geos require the client to know if 
> a ring in 
> a particular polygon is inner vs. outer? MapServer makes no provision 
> for this since it's not necessary for rendering features nor simple 
> intersection tests.
> Steve 
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