From 3ce2ad823ad77e57733a6222711e2f24b9c9434f Mon Sep 17 00:00:00 2001
From: Regina Obe <lr@pcorp.us>
Date: Tue, 15 Jul 2014 05:40:35 +0000
Subject: [PATCH] Add documentation for ST_Tesselate with figures

git-svn-id: http://svn.osgeo.org/postgis/trunk@12781 b70326c6-7e19-0410-871a-916f4a2858ee
---
 doc/html/image_src/Makefile.in        |   2 +
 doc/html/image_src/st_tesselate03.wkt |   1 +
 doc/html/image_src/st_tesselate04.wkt |   5 ++
 doc/html/images/st_tesselate01.png    | Bin 0 -> 6072 bytes
 doc/html/images/st_tesselate02.png    | Bin 0 -> 9397 bytes
 doc/reference_sfcgal.xml              |  77 +++++++++++++++++++++++++-
 6 files changed, 83 insertions(+), 2 deletions(-)
 create mode 100644 doc/html/image_src/st_tesselate03.wkt
 create mode 100644 doc/html/image_src/st_tesselate04.wkt
 create mode 100644 doc/html/images/st_tesselate01.png
 create mode 100644 doc/html/images/st_tesselate02.png

diff --git a/doc/html/image_src/Makefile.in b/doc/html/image_src/Makefile.in
index 005e48278..7fd25ec67 100644
--- a/doc/html/image_src/Makefile.in
+++ b/doc/html/image_src/Makefile.in
@@ -112,6 +112,8 @@ IMAGES= \
 	../images/st_straightskeleton01.png \
 	../images/st_symdifference01.png \
 	../images/st_symdifference02.png \
+	../images/st_tesselate03.png \
+	../images/st_tesselate04.png \
 	../images/st_touches01.png \
 	../images/st_touches02.png \
 	../images/st_touches03.png \
diff --git a/doc/html/image_src/st_tesselate03.wkt b/doc/html/image_src/st_tesselate03.wkt
new file mode 100644
index 000000000..d2a1de642
--- /dev/null
+++ b/doc/html/image_src/st_tesselate03.wkt
@@ -0,0 +1 @@
+Style1;POLYGON (( 10 190, 10 70, 80 70, 80 130, 50 160, 120 160, 120 190, 10 190 ))
diff --git a/doc/html/image_src/st_tesselate04.wkt b/doc/html/image_src/st_tesselate04.wkt
new file mode 100644
index 000000000..c654f09b8
--- /dev/null
+++ b/doc/html/image_src/st_tesselate04.wkt
@@ -0,0 +1,5 @@
+Style1;POLYGON((80 130,50 160,80 70,80 130))
+Style2;POLYGON((50 160,10 190,10 70,50 160))
+Style3;POLYGON((80 70,50 160,10 70,80 70))
+Style4;POLYGON((120 160,120 190,50 160,120 160))
+Style5;POLYGON((120 190,10 190,50 160,120 190))
\ No newline at end of file
diff --git a/doc/html/images/st_tesselate01.png b/doc/html/images/st_tesselate01.png
new file mode 100644
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diff --git a/doc/reference_sfcgal.xml b/doc/reference_sfcgal.xml
index 9ff3315fd..9289d2910 100644
--- a/doc/reference_sfcgal.xml
+++ b/doc/reference_sfcgal.xml
@@ -389,7 +389,7 @@ FROM  ST_GeomFromText('LINESTRING Z (2 2 6,1.5 1.5 7,1 1 8,0.5 0.5 8,0 0 10)') A
 	  <refnamediv>
 		<refname>ST_Tesselate</refname>
 
-		<refpurpose>Perform surface Tesselation</refpurpose>
+		<refpurpose>Perform surface Tesselation of a polygon or polyhedralsurface and returns as a TIN or collection of TINS</refpurpose>
 	  </refnamediv>
 
 	  <refsynopsisdiv>
@@ -403,13 +403,86 @@ FROM  ST_GeomFromText('LINESTRING Z (2 2 6,1.5 1.5 7,1 1 8,0.5 0.5 8,0 0 10)') A
 
 	  <refsection>
 		<title>Description</title>
-
+		<para>Takes as input a surface such a  MULTI(POLYGON) or POLYHEDRALSURFACE and returns a TIN representation via the process of tesselation using triangles.</para>
 		<para>Availability: 2.1.0</para>
 		<para>&sfcgal_required;</para>
 		<para>&Z_support;</para>
 		<para>&P_support;</para>
 		<para>&T_support;</para>
 	  </refsection>
+	  
+	  <informaltable>
+				  <tgroup cols="2">
+					<tbody>
+					  <row>
+						<entry><para>
+						<programlisting>SELECT ST_GeomFromText('POLYHEDRALSURFACE Z( ((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0)), 
+		((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0)), ((0 0 0, 1 0 0, 1 0 1, 0 0 1, 0 0 0)), 
+		((1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0)), 
+		((0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0)), ((0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1)) )');</programlisting>
+						<informalfigure>
+							<mediaobject>
+							  <imageobject>
+								<imagedata fileref="images/st_tesselation01.png" />
+							  </imageobject>
+							  <caption><para>Original Cube</para></caption>
+							</mediaobject>
+						  </informalfigure></para>
+					  </entry>
+					  <entry><para>
+					  <programlisting>SELECT ST_Tesselate(ST_GeomFromText('POLYHEDRALSURFACE Z( ((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 0 0)), 
+		((0 0 0, 0 1 0, 1 1 0, 1 0 0, 0 0 0)), ((0 0 0, 1 0 0, 1 0 1, 0 0 1, 0 0 0)), 
+		((1 1 0, 1 1 1, 1 0 1, 1 0 0, 1 1 0)), 
+		((0 1 0, 0 1 1, 1 1 1, 1 1 0, 0 1 0)), ((0 0 1, 1 0 1, 1 1 1, 0 1 1, 0 0 1)) )'));</programlisting></para>
+		<para>ST_AsText output:</para>
+		<screen>TIN Z (((0 0 0,0 0 1,0 1 1,0 0 0)),((0 1 0,0 0 0,0 1 1,0 1 0)),((0 0 0,0 1 0,1 1 0,0 0 0)),
+		((1 0 0,0 0 0,1 1 0,1 0 0)),((0 0 1,1 0 0,1 0 1,0 0 1)),((0 0 1,0 0 0,1 0 0,0 0 1)),
+		((1 1 0,1 1 1,1 0 1,1 1 0)),((1 0 0,1 1 0,1 0 1,1 0 0)),((0 1 0,0 1 1,1 1 1,0 1 0)),
+		((1 1 0,0 1 0,1 1 1,1 1 0)),((0 1 1,1 0 1,1 1 1,0 1 1)),((0 1 1,0 0 1,1 0 1,0 1 1)))</screen>
+					  <para><informalfigure>
+							<mediaobject>
+							  <imageobject>
+								<imagedata fileref="images/st_tesselation02.png" />
+							  </imageobject>
+							  <caption><para>Tesselated Cube with triangles colored</para></caption>
+							</mediaobject>
+						  </informalfigure></para>
+					  </entry>
+					  </row>
+					  
+					  <row>
+						<entry><para>
+						<programlisting>SELECT 'POLYGON (( 10 190, 10 70, 80 70, 80 130, 50 160, 120 160, 120 190, 10 190 ))'::geometry;</programlisting>
+						<informalfigure>
+							<mediaobject>
+							  <imageobject>
+								<imagedata fileref="images/st_tesselate03.png" />
+							  </imageobject>
+							  <caption><para>Original polygon</para></caption>
+							</mediaobject>
+						  </informalfigure></para>
+					  </entry>
+					  <entry><para>
+					  <programlisting>SELECT 
+	ST_Tesselate('POLYGON (( 10 190, 10 70, 80 70, 80 130, 50 160, 120 160, 120 190, 10 190 ))'::geometry);</programlisting>
+	</para>
+	<para>ST_AsText output</para>
+	<screen>TIN(((80 130,50 160,80 70,80 130)),((50 160,10 190,10 70,50 160)),
+	 ((80 70,50 160,10 70,80 70)),((120 160,120 190,50 160,120 160)),((120 190,10 190,50 160,120 190)))</screen>
+					  <para><informalfigure>
+							<mediaobject>
+							  <imageobject>
+								<imagedata fileref="images/st_tesselate04.png" />
+							  </imageobject>
+							  <caption><para>Tesselated Polygon</para></caption>
+							</mediaobject>
+						  </informalfigure></para>
+					  </entry>
+					  </row>
+				</tbody>
+				</tgroup>
+			</informaltable>
+	  </refsection>
 
 	</refentry>
 
-- 
2.50.1