self-hosted/postgis
self-hosted/postgis
1
0
Fork 0
mirror of https://git.osgeo.org/gitea/postgis/postgis synced 2024-10-24 09:02:37 +00:00
Code Issues Packages Projects Releases Wiki Activity

figure for minimum bounding circle

Browse source 
git-svn-id: http://svn.osgeo.org/postgis/trunk@4448 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Regina Obe 2009-09-08 05:24:07 +00:00
parent 4b554ed1f7
commit b485522165
2 changed files with 24 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
doc/html/image_src/Makefile.in
View file

@ -58,6 +58,7 @@ IMAGES= \
../images/st_isvalid06.png \
../images/st_isvalid07.png \
../images/st_isvalid08.png \
../images/st_minimumboundingcircle01.png \
../images/st_symdifference01.png \
../images/st_symdifference02.png \
../images/st_touches01.png \

40
doc/reference.xml
View file

@ -12152,7 +12152,7 @@ POLYGON((50 5,10 8,10 10,100 190,150 30,150 10,50 5))
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="ST_Collect" /></para>
<para><xref linkend="ST_Collect" />, <xref linkend="ST_MinimumBoundingCircle" /></para>
</refsection>
</refentry>
@ -12824,26 +12824,32 @@ SELECT ST_AsEWKT(ST_LineToCurve(ST_GeomFromEWKT('LINESTRING(1 2 3, 3 4 8, 5 6 4,
ST_MinimumBoundingCircle(ST_Collect(d.the_geom)) As the_geom
FROM disease_obs As d
GROUP BY d.disease_type;
--Only use 8 segs to approximate a quarter circle
</programlisting>
<informalfigure>
<mediaobject>
<imageobject>
<imagedata fileref="images/st_minimumboundingcircle01.png" />
</imageobject>
<caption><para>Minimum bounding circle of a point and linestring. Using 8 segs to approximate a quarter circle</para></caption>
</mediaobject>
</informalfigure>
<programlisting>
SELECT ST_AsText(ST_MinimumBoundingCircle(
ST_Collect(
ST_GeomFromEWKT('LINESTRING(1 2,3 4)'),
ST_MakePoint(0, 2)), 8
ST_GeomFromEWKT('LINESTRING(50 100,150 175)'),
ST_Point(0, 100)), 8
)) As wktmbc;
wktmbc
-----------
POLYGON((3.30277563773199 3,3.26813580935709 2.64829592031203,3.16554751341057 2.31010763116856,
2.9989531605735 1.99843151886317,2.7747548783982 1.7252451216018,2.50156848113683 1.50104683942651,
2.18989236883145 1.33445248658943,1.85170407968797 1.23186419064291,1.5 1.19722436226801,
1.14829592031204 1.23186419064291,0.81010763116856 1.33445248658943,0.498431518863177 1.5010468394265,
0.225245121601807 1.7252451216018,0.00104683942650734 1.99843151886317,-0.16554751341057 2.31010763116855,
-0.268135809357086 2.64829592031203,-0.302775637731995 2.99999999999999,-0.268135809357088 3.35170407968796,
-0.165547513410575 3.68989236883144,0.00104683942650074 4.00156848113682,0.225245121601799 4.27475487839819,
0.498431518863167 4.49895316057349,0.81010763116855 4.66554751341057,1.14829592031203 4.76813580935709,
1.49999999999999 4.80277563773199,1.85170407968796 4.76813580935709,2.18989236883144 4.66554751341057,
2.50156848113682 4.4989531605735,2.77475487839819 4.2747548783982,2.99895316057349 4.00156848113683,
3.16554751341057 3.68989236883145,3.26813580935709 3.35170407968797,3.30277563773199 3))
POLYGON((158.852549156242 137.5,157.241345936731 121.141179183236,152.469653914349 105.411018676327,144.720846537521 90.914019725979,
134.292706128157 78.2072938718429,121.585980274021 67.7791534624793,107.088981323673 60.0303460856514,
91.3588208167646 55.2586540632694,75.0000000000001 53.6474508437579,58.6411791832357 55.2586540632694,42.911018676327 60.0303460856513,
28.4140197259791 67.7791534624792,15.707293871843 78.2072938718428,5.27915346247937 90.9140197259787,-2.46965391434857 105.411018676327,
-7.24134593673054 121.141179183235,-8.85254915624212 137.5,-7.24134593673065 153.858820816764,-2.46965391434878 169.588981323673,
5.27915346247906 184.085980274021,15.7072938718426 196.792706128157,28.4140197259786 207.220846537521,42.9110186763265 214.969653914349,
58.6411791832352 219.741345936731,74.9999999999997 221.352549156242,91.3588208167642 219.741345936731,107.088981323673 214.969653914349,
121.585980274021 207.220846537521,134.292706128157 196.792706128157,144.720846537521 184.085980274021,152.469653914349 169.588981323673,
157.241345936731 153.858820816765,158.852549156242 137.5))
</programlisting>
</refsection>
<refsection>
@ -13220,7 +13226,7 @@ MULTILINESTRING((1 3 2.75,1 4 2),(1 1 3,1 2 2.25))
<para><xref linkend="ST_Difference" />, <xref linkend="ST_Intersection" />, <xref linkend="ST_Union" /></para>
</refsection>
</refentry>
</refentry>
<refentry id="ST_Union">