Lu, Huayi
e6fa411af0
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
38 KiB
Geometric Type Conversion Functions
box(circle)
Description: Circle to box
Return type: box
Example:
1 2 3 4 5 | SELECT box(circle '((0,0),2.0)') AS RESULT; result --------------------------------------------------------------------------- (1.41421356237309,1.41421356237309),(-1.41421356237309,-1.41421356237309) (1 row) |
box(point, point)
Description: Points to box
Return type: box
Example:
1 2 3 4 5 | SELECT box(point '(0,0)', point '(1,1)') AS RESULT; result ------------- (1,1),(0,0) (1 row) |
box(polygon)
Description: Polygon to box
Return type: box
Example:
1 2 3 4 5 | SELECT box(polygon '((0,0),(1,1),(2,0))') AS RESULT; result ------------- (2,1),(0,0) (1 row) |
circle(box)
Description: Box to circle
Return type: circle
Example:
1 2 3 4 5 | SELECT circle(box '((0,0),(1,1))') AS RESULT; result ------------------------------- <(0.5,0.5),0.707106781186548> (1 row) |
circle(point, double precision)
Description: Center and radius to circle
Return type: circle
Example:
1 2 3 4 5 | SELECT circle(point '(0,0)', 2.0) AS RESULT; result ----------- <(0,0),2> (1 row) |
circle(polygon)
Description: Polygon to circle
Return type: circle
Example:
1 2 3 4 5 | SELECT circle(polygon '((0,0),(1,1),(2,0))') AS RESULT; result ------------------------------------------- <(1,0.333333333333333),0.924950591148529> (1 row) |
lseg(box)
Description: Box diagonal to line segment
Return type: lseg
Example:
1 2 3 4 5 | SELECT lseg(box '((-1,0),(1,0))') AS RESULT; result ---------------- [(1,0),(-1,0)] (1 row) |
lseg(point, point)
Description: Points to line segment
Return type: lseg
Example:
1 2 3 4 5 | SELECT lseg(point '(-1,0)', point '(1,0)') AS RESULT; result ---------------- [(-1,0),(1,0)] (1 row) |
path(polygon)
Description: Polygon to path
Return type: path
Example:
1 2 3 4 5 | SELECT path(polygon '((0,0),(1,1),(2,0))') AS RESULT; result --------------------- ((0,0),(1,1),(2,0)) (1 row) |
point(double precision, double precision)
Description: Points
Return type: point
Example:
1 2 3 4 5 | SELECT point(23.4, -44.5) AS RESULT; result -------------- (23.4,-44.5) (1 row) |
point(box)
Description: Center of box
Return type: point
Example:
1 2 3 4 5 | SELECT point(box '((-1,0),(1,0))') AS RESULT; result -------- (0,0) (1 row) |
point(circle)
Description: Center of circle
Return type: point
Example:
1 2 3 4 5 | SELECT point(circle '((0,0),2.0)') AS RESULT; result -------- (0,0) (1 row) |
point(lseg)
Description: Center of line segment
Return type: point
Example:
1 2 3 4 5 | SELECT point(lseg '((-1,0),(1,0))') AS RESULT; result -------- (0,0) (1 row) |
point(polygon)
Description: Center of polygon
Return type: point
Example:
1 2 3 4 5 | SELECT point(polygon '((0,0),(1,1),(2,0))') AS RESULT; result ----------------------- (1,0.333333333333333) (1 row) |
polygon(box)
Description: Box to 4-point polygon
Return type: polygon
Example:
1 2 3 4 5 | SELECT polygon(box '((0,0),(1,1))') AS RESULT; result --------------------------- ((0,0),(0,1),(1,1),(1,0)) (1 row) |
polygon(circle)
Description: Circle to 12-point polygon
Return type: polygon
Example:
1 2 3 4 5 6 | SELECT polygon(circle '((0,0),2.0)') AS RESULT; result ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ((-2,0),(-1.73205080756888,1),(-1,1.73205080756888),(-1.22464679914735e-16,2),(1,1.73205080756888),(1.73205080756888,1),(2,2.44929359829471e-16),(1.73205080756888,-0.999999999999999),(1,-1.73205080756888),(3.67394039744206e-16,-2),(-0.999999999999999,-1.73205080756888),(-1.73205080756888,-1)) (1 row) |
polygon(npts, circle)
Description: Circle to npts-point polygon
Return type: polygon
Example:
1 2 3 4 5 6 | SELECT polygon(12, circle '((0,0),2.0)') AS RESULT; result ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ((-2,0),(-1.73205080756888,1),(-1,1.73205080756888),(-1.22464679914735e-16,2),(1,1.73205080756888),(1.73205080756888,1),(2,2.44929359829471e-16),(1.73205080756888,-0.999999999999999),(1,-1.73205080756888),(3.67394039744206e-16,-2),(-0.999999999999999,-1.73205080756888),(-1.73205080756888,-1)) (1 row) |
polygon(path)
Description: Path to polygon
Return type: polygon
Example:
1 2 3 4 5 | SELECT polygon(path '((0,0),(1,1),(2,0))') AS RESULT; result --------------------- ((0,0),(1,1),(2,0)) (1 row) |