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From "Thomas Neidhart (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-668) Polygon difference function produces erroneous results with certain polygons
Date Tue, 24 Jan 2012 11:50:41 GMT

    [ https://issues.apache.org/jira/browse/MATH-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192076#comment-13192076
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Thomas Neidhart commented on MATH-668:
--------------------------------------

I have checked the attached test cases:

 - circle test: you remove the outer circle from the inner one, resulting in an empty polygon
set, which is correct behaviour. If you switch the two circles, the correct result is returned:
a PolygonsSet with two loops: the two circles itself.

 - testdifference2: the described behaviour is implementation specific due to the way the
hyperplane is cut when subtracting the two regions.
                
> Polygon difference function produces erroneous results with certain polygons
> ----------------------------------------------------------------------------
>
>                 Key: MATH-668
>                 URL: https://issues.apache.org/jira/browse/MATH-668
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>            Reporter: Curtis Jensen
>            Assignee: Luc Maisonobe
>              Labels: difference, math,, polygon,
>             Fix For: 3.0
>
>         Attachments: PolygonsSetCircleTest.java, PolygonsSetTest.java
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> For some polygons, the difference function produces erroneous results.  This appears
to happen when one polygon is completely encompassed in another, and the outer has multiple
concave sections.

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