You guys are definitely over my head, but it sounds like I should hold off on commiting Larry's file. Is this correct?
If Larry is still working on a fix I can wait until he tells me it is ready to be commited. The Sunburned Surveyor On Fri, Apr 4, 2008 at 12:14 PM, Larry Becker <[EMAIL PROTECTED]> wrote: > Well, I have already found problems with this mod. I incorrectly assumed > that the clock-ness of the shells that were added as holes would be fixed by > later methods. That appears not to be true. Even though the mod makes the > holes appear correct, they still test bad with the QA tool. I'll have to > uncomment out the reverseRing loop. > > @Michaël, surely you didn't make the mistake of thinking I knew what I was > doing? ;-) My check for ((shells.size()>1) && (holes.size()== 0)) is > simply an attempt to minimize any damage my hack might do. Sorry the code > had so many changes. I knew I needed to subroutine the inline code so I > copied the work that was already done in geotools 2.5. > > regards, > Larry > > > > On Fri, Apr 4, 2008 at 2:00 PM, Michaël Michaud <[EMAIL PROTECTED]> > wrote: > > Martin Davis a écrit : > > > > > > > > > > >Michaël Michaud wrote: > > > > > > > > >>... about the second point, as you know SFS a no one, you may have an > > >>answer to the following question : > > >>why polylines may be made of lines sharing their boundaries > > >>and multipolygons cannot be made of polygons sharing their edges (if > > >>that's what "shells can touch at any finite number of points" means) > > >> > > >> > > >> > > >That *is* what I meant by "shells can touch at any finite number of > points". > > > > > >I can't see into the minds of the standards authors, but speaking as a > > >developer who has implemented the standard, the restriction on how > > >polygon shells touch makes for nicer topological assumptions, and hence > > >simpler code. With this rule you can assume that all edges in polygon > > >geometries are truly on the topological boundary - i.e that they divide > > >the polygon interior from the exterior. Without this assumption, you > > >have to basically do a "dissolve" to remove "interior" edges before > > >doing any further processing. > > > > > >Polylines don't offer quite such a strong topological distinction (they > > >don't divide the world into interior and exterior), so there aren't any > > >unpleasant implications to just letting their linework "go anywhere it > > >wants to". > > > > > >There are other assumptions which SFS could have made to make processing > > >simpler - such as enforcing an orientation for polygon rings. But I > > >guess they wanted to open the model up as much as reasonable, so as not > > >to make a whole bunch of geometry invalid. Although then they could > > >have allowed "inverted" polygons (self-touching at a point - ArcSDE > > >style) as well. > > > > > >M > > > > > > > > All that makes sense to me. > > Thanks for the detailed answer. > > > > Michaël > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ------------------------------------------------------------------------- > > Check out the new SourceForge.net Marketplace. > > It's the best place to buy or sell services for > > just about anything Open Source. > > > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > > _______________________________________________ > > Jump-pilot-devel mailing list > > Jump-pilot-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > -- > http://amusingprogrammer.blogspot.com/ > ------------------------------------------------------------------------- > Check out the new SourceForge.net Marketplace. > It's the best place to buy or sell services for > just about anything Open Source. > http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
