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From "Curtis Jensen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-668) Polygon difference function produces erroneous results with certain polygons
Date Mon, 12 Sep 2011 15:40:09 GMT

    [ https://issues.apache.org/jira/browse/MATH-668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102737#comment-13102737
] 

Curtis Jensen commented on MATH-668:
------------------------------------

Never mind on testdifference1.  I think I see the problem (bottom left corner of outer polygon
is ambiguous).  I'll work on creating a better example.  Though, testdifference2 is still
an interesting case.

> 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
>              Labels: difference, math,, polygon,
>         Attachments: 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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