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Improve description of geometric operators.
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‎doc/src/sgml/func.sgml

Lines changed: 48 additions & 33 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.141 2003/02/19 03:12:22 momjian Exp $
2+
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.142 2003/03/03 03:31:23 tgl Exp $
33
PostgreSQL documentation
44
-->
55

@@ -5436,94 +5436,109 @@ SELECT TIMESTAMP 'now';
54365436
<entry>Number of points in path or polygon</entry>
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<entry><literal># '((1,0),(0,1),(-1,0))'</literal></entry>
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</row>
5439+
<row>
5440+
<entry> @-@ </entry>
5441+
<entry>Length or circumference</entry>
5442+
<entry><literal>@-@ path '((0,0),(1,0))'</literal></entry>
5443+
</row>
5444+
<row>
5445+
<entry> @@ </entry>
5446+
<entry>Center of</entry>
5447+
<entry><literal>@@ circle '((0,0),10)'</literal></entry>
5448+
</row>
54395449
<row>
54405450
<entry> ## </entry>
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<entry>Point of closest proximity</entry>
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<entry><literal>point '(0,0)' ## lseg '((2,0),(0,2))'</literal></entry>
54435453
</row>
5454+
<row>
5455+
<entry> &lt;-&gt; </entry>
5456+
<entry>Distance between</entry>
5457+
<entry><literal>circle '((0,0),1)' &lt;-&gt; circle '((5,0),1)'</literal></entry>
5458+
</row>
54445459
<row>
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<entry> &amp;&amp; </entry>
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<entry>Overlaps?</entry>
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<entry><literal>box '((0,0),(1,1))' &amp;&amp; box '((0,0),(2,2))'</literal></entry>
54485463
</row>
54495464
<row>
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<entry> &amp;&lt; </entry>
5451-
<entry>Overlaps to left?</entry>
5466+
<entry>Overlaps or is left of?</entry>
54525467
<entry><literal>box '((0,0),(1,1))' &amp;&lt; box '((0,0),(2,2))'</literal></entry>
54535468
</row>
54545469
<row>
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<entry> &amp;&gt; </entry>
5456-
<entry>Overlaps to right?</entry>
5471+
<entry>Overlaps or is right of?</entry>
54575472
<entry><literal>box '((0,0),(3,3))' &amp;&gt; box '((0,0),(2,2))'</literal></entry>
54585473
</row>
5459-
<row>
5460-
<entry> &lt;-&gt; </entry>
5461-
<entry>Distance between</entry>
5462-
<entry><literal>circle '((0,0),1)' &lt;-&gt; circle '((5,0),1)'</literal></entry>
5463-
</row>
54645474
<row>
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<entry> &lt;&lt; </entry>
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<entry>Left of?</entry>
54675477
<entry><literal>circle '((0,0),1)' &lt;&lt; circle '((5,0),1)'</literal></entry>
54685478
</row>
5469-
<row>
5470-
<entry> &lt;^ </entry>
5471-
<entry>Is below?</entry>
5472-
<entry><literal>circle '((0,0),1)' &lt;^ circle '((0,5),1)'</literal></entry>
5473-
</row>
54745479
<row>
54755480
<entry> &gt;&gt; </entry>
5476-
<entry>Is right of?</entry>
5481+
<entry>Right of?</entry>
54775482
<entry><literal>circle '((5,0),1)' &gt;&gt; circle '((0,0),1)'</literal></entry>
54785483
</row>
5484+
<row>
5485+
<entry> &lt;^ </entry>
5486+
<entry>Below?</entry>
5487+
<entry><literal>circle '((0,0),1)' &lt;^ circle '((0,5),1)'</literal></entry>
5488+
</row>
54795489
<row>
54805490
<entry> &gt;^ </entry>
5481-
<entry>Is above?</entry>
5491+
<entry>Above?</entry>
54825492
<entry><literal>circle '((0,5),1)' >^ circle '((0,0),1)'</literal></entry>
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</row>
54845494
<row>
54855495
<entry> ?# </entry>
5486-
<entry>Intersects or overlaps</entry>
5496+
<entry>Intersect?</entry>
54875497
<entry><literal>lseg '((-1,0),(1,0))' ?# box '((-2,-2),(2,2))'</literal></entry>
54885498
</row>
54895499
<row>
54905500
<entry> ?- </entry>
5491-
<entry>Is horizontal?</entry>
5492-
<entry><literal>point '(1,0)' ?- point '(0,0)'</literal></entry>
5501+
<entry>Horizontal?</entry>
5502+
<entry><literal>?- lseg '((-1,0),(1,0))'</literal></entry>
54935503
</row>
54945504
<row>
5495-
<entry> ?-| </entry>
5496-
<entry>Is perpendicular?</entry>
5497-
<entry><literal>lseg '((0,0),(0,1))' ?-| lseg '((0,0),(1,0))'</literal></entry>
5505+
<entry> ?- </entry>
5506+
<entry>Horizontally aligned?</entry>
5507+
<entry><literal>point '(1,0)' ?- point '(0,0)'</literal></entry>
54985508
</row>
54995509
<row>
5500-
<entry> @-@ </entry>
5501-
<entry>Length or circumference</entry>
5502-
<entry><literal>@-@ path '((0,0),(1,0))'</literal></entry>
5510+
<entry> ?| </entry>
5511+
<entry>Vertical?</entry>
5512+
<entry><literal>?| lseg '((-1,0),(1,0))'</literal></entry>
55035513
</row>
55045514
<row>
55055515
<entry> ?| </entry>
5506-
<entry>Is vertical?</entry>
5516+
<entry>Vertically aligned?</entry>
55075517
<entry><literal>point '(0,1)' ?| point '(0,0)'</literal></entry>
55085518
</row>
5519+
<row>
5520+
<entry> ?-| </entry>
5521+
<entry>Perpendicular?</entry>
5522+
<entry><literal>lseg '((0,0),(0,1))' ?-| lseg '((0,0),(1,0))'</literal></entry>
5523+
</row>
55095524
<row>
55105525
<entry> ?|| </entry>
5511-
<entry>Is parallel?</entry>
5526+
<entry>Parallel?</entry>
55125527
<entry><literal>lseg '((-1,0),(1,0))' ?|| lseg '((-1,2),(1,2))'</literal></entry>
55135528
</row>
55145529
<row>
5515-
<entry> @ </entry>
5516-
<entry>Contained or on</entry>
5517-
<entry><literal>point '(1,1)' @ circle '((0,0),2)'</literal></entry>
5530+
<entry> ~ </entry>
5531+
<entry>Contains?</entry>
5532+
<entry><literal>circle '((0,0),2)' ~ point '(1,1)'</literal></entry>
55185533
</row>
55195534
<row>
5520-
<entry> @@ </entry>
5521-
<entry>Center of</entry>
5522-
<entry><literal>@@ circle '((0,0),10)'</literal></entry>
5535+
<entry> @ </entry>
5536+
<entry>Contained in or on?</entry>
5537+
<entry><literal>point '(1,1)' @ circle '((0,0),2)'</literal></entry>
55235538
</row>
55245539
<row>
55255540
<entry> ~= </entry>
5526-
<entry>Same as</entry>
5541+
<entry>Same as?</entry>
55275542
<entry><literal>polygon '((0,0),(1,1))' ~= polygon '((1,1),(0,0))'</literal></entry>
55285543
</row>
55295544
</tbody>

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