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From: Peter van Oosterom <Peter.van.Oosterom@tnofel.fel.tno.nl>
Subject: problem with point-in-polygon
To: postgres@postgres.berkeley.edu
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To: postgres@postgres.berkeley.edu
Date: Fri, 7 Feb 92 14:49:35 MET
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Dear Postgres-group,

Some strange results are obtained with the point-in-polygon function
(function name is on_ppath and operator is ---`).  For example:


Go
* retrieve (test=("(0,0)"::point ---` "(1,3,0,1,1,1,1,0)"::path))\g

Query sent to backend is "retrieve (test=("(0,0)"::point ---` "(1,3,0,1,1,1,1,0)
"::path))"
---------------
| test        |
---------------
| t           |
---------------

This is not correct as (0,0) lies outside the triangle (0,1) (1,1) (1,0).
The triangle lies in the upper-right corner of the unit-square.

Kind regards, Peter van Oosterom.