[geos-devel] [GEOS] #732: BufferOp(0.0) makes the attached polygon "miss"!

GEOS geos-trac at osgeo.org
Sun Jul 19 23:44:34 PDT 2015

#732: BufferOp(0.0) makes the attached polygon "miss"!
 Reporter:  jiangdaidai  |       Owner:  geos-devel@…
     Type:  defect       |      Status:  new
 Priority:  major        |   Milestone:  3.4.3
Component:  Default      |     Version:  3.4.2
 Severity:  Critical     |  Resolution:
 Keywords:  BufferOp     |

Comment (by jiangdaidai):

 I find the reason: my polygon self-intersectes and is_ccw(my polygon)
 makes the key unexpected performance. During the learning of GEOS, I think
 there may be one bug :
 SegmentIntersector.cpp Line 114, according to the algorithm logical,
 int maxSegIndex=e0->getNumPoints()-1; -->
 int maxSegIndex=e0->getNumPoints()-2;

Ticket URL: <http://trac.osgeo.org/geos/ticket/732#comment:2>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).

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