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Add examples for ST_MakePolygon, correct non-st to ST references in ST_MakePolygon section

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git-svn-id: http://svn.osgeo.org/postgis/trunk@2828 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Regina Obe 2008-07-07 11:57:11 +00:00
parent cd80d8ea2e
commit 0a44983cea
1 changed files with 32 additions and 5 deletions
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37
doc/postgis.xml
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@ -4579,15 +4579,42 @@ SELECT ST_AsText(ST_MakeLine(ST_MakePoint(1,2), ST_MakePoint(3,4)))
</listitem>
</varlistentry>
<varlistentry>
<term>ST_MakePolygon(linestring, [linestring[]])</term>
<varlistentry>
<term>ST_MakePolygon(linestring geometry)</term>
<listitem>
<para>Creates a Polygon formed by the given shell. Input geometries must be closed
LINESTRINGS (see <link linkend="IsClosed">ST_IsClosed</link> and
<link linkend="GeometryType">ST_GeometryType</link>). This function will not accept a MULTILINESTRING.</para>
<programlisting>
SELECT ST_MakePolygon(ST_GeomFromText('LINESTRING(75.15 29.53,77 29,77.6 29.5, 75.15 29.53)'));
--If linestring is not closed
--you can add the start point to close it
SELECT ST_MakePolygon(ST_AddPoint(foo.open_line, ST_StartPoint(foo.open_line)))
FROM (
SELECT ST_GeomFromText('LINESTRING(75.15 29.53,77 29,77.6 29.5)') As open_line) As foo
</programlisting>
</listitem>
</varlistentry>
<varlistentry>
<term>ST_MakePolygon(linestring geometry, linestrings geometry[])</term>
<listitem>
<para>Creates a Polygon formed by the given shell and array of
holes. You can construct a geometry array using <link
linkend="Accum">Accum</link>. Input geometries must be closed
LINESTRINGS (see <link linkend="IsClosed">IsClosed</link> and
<link linkend="GeometryType">GeometryType</link>).</para>
linkend="Accum">ST_Accum</link> or the PostgreSQL ARRAY[] and ARRAY() constructs. Input geometries must be closed
LINESTRINGS (see <link linkend="IsClosed">ST_IsClosed</link> and
<link linkend="GeometryType">ST_GeometryType</link>).</para>
<programlisting>
--Build a donut with an ant hole
SELECT ST_MakePolygon(
ST_ExteriorRing(ST_Buffer(foo.line,10)),
ARRAY[ST_Translate(foo.line,1,1),ST_ExteriorRing(ST_Buffer(ST_MakePoint(20,20),1)) ]
)
FROM
(SELECT ST_ExteriorRing(ST_Buffer(ST_MakePoint(10,10),10,10))
As line )
As foo
</programlisting>
</listitem>
</varlistentry>