| 函数 |
返回 |
描述 |
例子 |
| area(box) |
float8 |
长方形范围 |
area('((0,0),(1,1))'::box) |
| area(circle) |
float8 |
圆的范围 |
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 |
对象中心 |
center('((0,0),(1,2))'::box) |
| center(circle) |
point |
对象中心 |
center('((0,0),2.0)'::circle) |
| diameter(circle) |
float8 |
圆直径 |
diameter('((0,0),2.0)'::circle) |
| height(box) |
float8 |
长方形高 |
height('((0,0),(1,1))'::box) |
| isclosed(path) |
bool |
如果是闭合路径为真 |
isclosed('((0,0),(1,1),(2,0))'::path) |
| isopen(path) |
bool |
如果是开环路径为真 |
isopen('[(0,0),(1,1),(2,0)]'::path) |
| length(lseg) |
float8 |
线段长度 |
length('((-1,0),(1,0))'::lseg) |
| length(path) |
float8 |
路径长度 |
length('((0,0),(1,1),(2,0))'::path) |
| pclose(path) |
path |
将路径转换为闭合 |
pclose('[(0,0),(1,1),(2,0)]'::path) |
| point(lseg,lseg) |
point |
转换成点 (相交) |
point('((-1,0),(1,0))'::lseg,'((-2,-2),(2,2))'::lseg) |
| points(path) |
int4 |
路径中点数 |
points('[(0,0),(1,1),(2,0)]'::path) |
| popen(path) |
path |
将路径转换为开环 |
popen('((0,0),(1,1),(2,0))'::path) |
| radius(circle) |
float8 |
圆半径 |
radius('((0,0),2.0)'::circle) |
| width(box) |
float8 |
长方形宽 |
width('((0,0),(1,1))'::box) |
| 函数 |
返回 |
描述 |
例子 |
| box(circle) |
box |
将圆转换成长方形 |
box('((0,0),2.0)'::circle) |
| box(point,point) |
box |
将点转换成长方形 |
box('(0,0)'::point,'(1,1)'::point) |
| box(polygon) |
box |
将多边形转换成长方形 |
box('((0,0),(1,1),(2,0))'::polygon) |
| circle(box) |
circle |
转换成圆 |
circle('((0,0),(1,1))'::box) |
| circle(point,float8) |
circle |
转换成圆 |
circle('(0,0)'::point,2.0) |
| lseg(box) |
lseg |
将长方形转成线段 |
lseg('((-1,0),(1,0))'::box) |
| lseg(point,point) |
lseg |
转换成线段 |
lseg('(-1,0)'::point,'(1,0)'::point) |
| path(polygon) |
point |
转换成路径 |
path('((0,0),(1,1),(2,0))'::polygon) |
| point(circle) |
point |
转换成点 (中心) |
point('((0,0),2.0)'::circle) |
| point(lseg,lseg) |
point |
转换成点(相交) |
point('((-1,0),(1,0))'::lseg,'((-2,-2),(2,2))'::lseg) |
| point(polygon) |
point |
多边形中心 |
point('((0,0),(1,1),(2,0))'::polygon) |
| polygon(box) |
polygon |
转换成12点的多边形 |
polygon('((0,0),(1,1))'::box) |
| polygon(circle) |
polygon |
转换成12点的多边形 |
polygon('((0,0),2.0)'::circle) |
| polygon(npts,circle) |
polygon |
转换成npts点的多边形 |
polygon(12,'((0,0),2.0)'::circle) |
| polygon(path) |
polygon |
转换成多边形 |
polygon('((0,0),(1,1),(2,0))'::path) |
| 函数 |
返回 |
描述 |
例子 |
| isoldpath(path) |
path |
测试是否v6.1前的路径 |
isoldpath('(1,3,0,0,1,1,2,0)'::path) |
| revertpoly(polygon) |
polygon |
转换v6.1前的多边形 |
revertpoly('((0,0),(1,1),(2,0))'::polygon) |
| upgradepath(path) |
path |
转换v6.1前的路径 |
upgradepath('(1,3,0,0,1,1,2,0)'::path) |
| upgradepoly(polygon) |
polygon |
转换v6.1前的多边形 |
upgradepoly('(0,1,2,0,1,0)'::polygon) |