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more examples to demonstrate its not just limited to 1 point snapping
git-svn-id: http://svn.osgeo.org/postgis/trunk@6283 b70326c6-7e19-0410-871a-916f4a2858ee
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@ -87,6 +87,8 @@ IMAGES= \
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../images/st_snap01.png \
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../images/st_snap02.png \
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../images/st_snap03.png \
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../images/st_snap04.png \
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../images/st_snap05.png \
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../images/st_split01.png \
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../images/st_split02.png \
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../images/st_split03.png \
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doc/html/image_src/st_snap04.wkt
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doc/html/image_src/st_snap04.wkt
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@ -0,0 +1,2 @@
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Style1;LINESTRING (5 107, 54 84, 101 100)
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Style3;MULTIPOLYGON(((5 107,26 200,126 200,126 125,101 100,54 84,5 107),(51 150,101 150,76 175,51 150)),((151 100,151 200,176 175,151 100)))
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doc/html/image_src/st_snap05.wkt
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doc/html/image_src/st_snap05.wkt
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@ -0,0 +1,2 @@
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Style3;LINESTRING(26 125,54 84,101 100)
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Style1;MULTIPOLYGON ((( 26 125, 26 200, 126 200, 126 125, 26 125 ),( 51 150, 101 150, 76 175, 51 150 )), (( 151 100, 151 200, 176 175, 151 100 )))
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@ -1459,10 +1459,13 @@ SELECT ST_AsEWKT(ST_SnapToGrid(ST_GeomFromEWKT('LINESTRING(-1.1115678 2.123 3 2.
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<refsection>
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<title>Examples</title>
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<informaltable>
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<tgroup cols="1">
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<tgroup cols="2">
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<colspec colname="column1" />
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<colspec colname="column2" />
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<spanspec namest="column1" nameend="column2" spanname="span-horiz" align="center" />
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<tbody>
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<row>
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<entry><informalfigure>
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<entry spanname="span-horiz"><informalfigure>
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<mediaobject>
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<imageobject>
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<imagedata fileref="images/st_snap01.png" />
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@ -1491,11 +1494,34 @@ FROM (SELECT ST_GeomFromText('MULTIPOLYGON ((( 26 125, 26 200, 126 200, 126 125,
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) As foo;
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polysnapped
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-------------------------------------------------------------------------------------------------
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----------------------------------------------------------------------------------------------
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MULTIPOLYGON(((26 125,26 200,126 200,126 125,101 100,26 125),
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(51 150,101 150,76 175,51 150)),((151 100,151 200,176 175,151 100)))
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</programlisting>
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</para></entry>
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</programlisting></para>
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</entry>
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<entry><para><informalfigure>
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<mediaobject>
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<imageobject>
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<imagedata fileref="images/st_snap04.png" />
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</imageobject>
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<caption><para>A multipolygon snapped to linestring to tolerance: 1.25 of distance.
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The new multipolygon is shown with reference linestring</para></caption>
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</mediaobject>
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</informalfigure>
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<programlisting>
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SELECT ST_AsText(ST_Snap(poly,line, ST_Distance(poly,line)*1.25)) AS polysnapped
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FROM (SELECT ST_GeomFromText('MULTIPOLYGON ((( 26 125, 26 200, 126 200, 126 125, 26 125 ),
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( 51 150, 101 150, 76 175, 51 150 )), (( 151 100, 151 200, 176 175, 151 100 )))') As poly,
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ST_GeomFromText('LINESTRING (5 107, 54 84, 101 100)') As line
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) As foo;
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polysnapped
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------------------------------------------------------------------------------------------
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MULTIPOLYGON(((5 107,26 200,126 200,126 125,101 100,54 84,5 107),
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(51 150,101 150,76 175,51 150)),((151 100,151 200,176 175,151 100)))
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</programlisting></para>
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</entry>
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</row>
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<row>
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<entry><para><informalfigure>
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@ -1519,9 +1545,29 @@ FROM (SELECT ST_GeomFromText('MULTIPOLYGON ((( 26 125, 26 200, 126 200, 126 125,
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----------------------------------------
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LINESTRING(5 107,26 125,54 84,101 100)
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</programlisting>
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</para></entry>
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</row>
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</para>
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</entry>
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<entry><para><informalfigure>
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<mediaobject>
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<imageobject>
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<imagedata fileref="images/st_snap05.png" />
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</imageobject>
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<caption><para>The linestring snapped to the original multipolygon at tolerance 1.25 of distance.
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The new linestring is shown with reference multipolygon</para></caption>
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</mediaobject>
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</informalfigure>
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<programlisting>
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SELECT ST_AsText(ST_Snap(line, poly, ST_Distance(poly,line)*1.25)) AS linesnapped
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FROM (SELECT ST_GeomFromText('MULTIPOLYGON ((( 26 125, 26 200, 126 200, 126 125, 26 125 ),
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( 51 150, 101 150, 76 175, 51 150 )), (( 151 100, 151 200, 176 175, 151 100 )))') As poly,
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ST_GeomFromText('LINESTRING (5 107, 54 84, 101 100)') As line
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) As foo;
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linesnapped
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---------------------------------------
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LINESTRING(26 125,54 84,101 100)
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</programlisting></para>
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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