[geos-devel] Comparing two QuadEdge objects

vishal tiwari hi.vishal123 at gmail.com
Fri Jul 12 06:50:54 PDT 2013

The method quadedge::QuadEdgeSubdivision::getVoronoiCellPolygon, requires a
comparison between two QuadEdge objects for not being equal, that's y i
need a comparison operator. I think CompareTo is implemented in
Coordinate[1]. And the code is trying to compare the origin and destination
coordinates of two QuadEdge. Should i compare the origin and destination
coordinates to be same, in order to say the QuadEdges are the same?



On 12 July 2013 18:12, Sandro Santilli <strk at keybit.net> wrote:

> On Fri, Jul 12, 2013 at 05:45:14PM +0530, vishal tiwari wrote:
> > Hey,
> >
> > If i want to compare two QuadEdge objects, then i am comparing the
> elements
> > _rot , next , isAlive, data and vertex. As _rot and next are also
> > QuadEdges, it goes into a recursion, so i am using the break condition as
> > when both objects are NULL.
> >
> > I just want to know if this is the correct way to do it? I am asking this
> > because i am having troubles in overloading the != operator for QuadEdge.
> What do you need comparison operator for ?
> When needsd JTS implements a compareTo method, but I don't see any here:
> https://jts-topo-suite.svn.sourceforge.net/svnroot/jts-topo-suite/trunk/jts/java/src/com/vividsolutions/jts/triangulate/quadedge/QuadEdge.java
> --strk;
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Vishal Tiwari
Computer Science and Engineering
Lab for Spatial Informatics
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