This page in other versions: Unsupported versions: 6.5

Geometric Functions

The geometric types point, box, lseg, line, path, polygon, and circle have a large set of native support functions.

Table 5-6. Geometric Functions

Function Returns Description Example
area(box) float8 area of box area('((0,0),(1,1))'::box)
area(circle) float8 area of circle area('((0,0),2.0)'::circle)
box(box,box) box boxes to intersection box box('((0,0),(1,1))','((0.5,0.5),(2,2))')
center(box) point center of object center('((0,0),(1,2))'::box)
center(circle) point center of object center('((0,0),2.0)'::circle)
diameter(circle) float8 diameter of circle diameter('((0,0),2.0)'::circle)
height(box) float8 vertical size of box height('((0,0),(1,1))'::box)
isclosed(path) bool a closed path? isclosed('((0,0),(1,1),(2,0))'::path)
isopen(path) bool an open path? isopen('[(0,0),(1,1),(2,0)]'::path)
length(lseg) float8 length of line segment length('((-1,0),(1,0))'::lseg)
length(path) float8 length of path length('((0,0),(1,1),(2,0))'::path)
pclose(path) path convert path to closed popen('[(0,0),(1,1),(2,0)]'::path)
point(lseg,lseg) point intersection point('((-1,0),(1,0))'::lseg,'((-2,-2),(2,2))'::lseg)
points(path) int4 number of points points('[(0,0),(1,1),(2,0)]'::path)
popen(path) path convert path to open popen('((0,0),(1,1),(2,0))'::path)
radius(circle) float8 radius of circle radius('((0,0),2.0)'::circle)
width(box) float8 horizontal size width('((0,0),(1,1))'::box)

Table 5-7. Geometric Type Conversion Functions

Function Returns Description Example
box(circle) box convert circle to box box('((0,0),2.0)'::circle)
box(point,point) box convert points to box box('(0,0)'::point,'(1,1)'::point)
box(polygon) box convert polygon to box box('((0,0),(1,1),(2,0))'::polygon)
circle(box) circle convert to circle circle('((0,0),(1,1))'::box)
circle(point,float8) circle convert to circle circle('(0,0)'::point,2.0)
lseg(box) lseg convert diagonal to lseg lseg('((-1,0),(1,0))'::box)
lseg(point,point) lseg convert to lseg lseg('(-1,0)'::point,'(1,0)'::point)
path(polygon) point convert to path path('((0,0),(1,1),(2,0))'::polygon)
point(circle) point convert to point (center) point('((0,0),2.0)'::circle)
point(lseg,lseg) point convert to point (intersection) point('((-1,0),(1,0))'::lseg, '((-2,-2),(2,2))'::lseg)
point(polygon) point center of polygon point('((0,0),(1,1),(2,0))'::polygon)
polygon(box) polygon convert to polygon with 12 points polygon('((0,0),(1,1))'::box)
polygon(circle) polygon convert to 12-point polygon polygon('((0,0),2.0)'::circle)
polygon(npts,circle) polygon convert to npts polygon polygon(12,'((0,0),2.0)'::circle)
polygon(path) polygon convert to polygon polygon('((0,0),(1,1),(2,0))'::path)

Table 5-8. Geometric Upgrade Functions

Function Returns Description Example
isoldpath(path) path test path for pre-v6.1 form isoldpath('(1,3,0,0,1,1,2,0)'::path)
revertpoly(polygon) polygon convert pre-v6.1 polygon revertpoly('((0,0),(1,1),(2,0))'::polygon)
upgradepath(path) path convert pre-v6.1 path upgradepath('(1,3,0,0,1,1,2,0)'::path)
upgradepoly(polygon) polygon convert pre-v6.1 polygon upgradepoly('(0,1,2,0,1,0)'::polygon)

Submit correction

If you see anything in the documentation that is not correct, does not match your experience with the particular feature or requires further clarification, please use this form to report a documentation issue.

Privacy Policy | About PostgreSQL
Copyright © 1996-2016 The PostgreSQL Global Development Group