Geometric Functions
area(object)
Description: Area calculation
Return type: double precision
Example:
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SELECT area(box '((0,0),(1,1))') AS RESULT; result -------- 1 (1 row) |
center(object)
Description: Figure center calculation
Return type: point
Example:
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SELECT center(box '((0,0),(1,2))') AS RESULT; result --------- (0.5,1) (1 row) |
diameter(circle)
Description: Circle diameter calculation
Return type: double precision
Example:
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SELECT diameter(circle '((0,0),2.0)') AS RESULT; result -------- 4 (1 row) |
height(box)
Description: Vertical size of box
Return type: double precision
Example:
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SELECT height(box '((0,0),(1,1))') AS RESULT; result -------- 1 (1 row) |
isclosed(path)
Description: A closed path?
Return type: boolean
Example:
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SELECT isclosed(path '((0,0),(1,1),(2,0))') AS RESULT; result -------- t (1 row) |
isopen(path)
Description: An open path?
Return type: boolean
Example:
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SELECT isopen(path '[(0,0),(1,1),(2,0)]') AS RESULT; result -------- t (1 row) |
length(object)
Description: Length calculation
Return type: double precision
Example:
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SELECT length(path '((-1,0),(1,0))') AS RESULT; result -------- 4 (1 row) |
npoints(path)
Description: Number of points in path
Return type: int
Example:
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SELECT npoints(path '[(0,0),(1,1),(2,0)]') AS RESULT; result -------- 3 (1 row) |
npoints(polygon)
Description: Number of points in polygon
Return type: int
Example:
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SELECT npoints(polygon '((1,1),(0,0))') AS RESULT; result -------- 2 (1 row) |
pclose(path)
Description: Converts path to closed.
Return type: path
Example:
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SELECT pclose(path '[(0,0),(1,1),(2,0)]') AS RESULT; result --------------------- ((0,0),(1,1),(2,0)) (1 row) |
popen(path)
Description: Converts path to open.
Return type: path
Example:
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SELECT popen(path '((0,0),(1,1),(2,0))') AS RESULT; result --------------------- [(0,0),(1,1),(2,0)] (1 row) |
radius(circle)
Description: Circle diameter calculation
Return type: double precision
Example:
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SELECT radius(circle '((0,0),2.0)') AS RESULT; result -------- 2 (1 row) |
width(box)
Description: Horizontal size of box
Return type: double precision
Example:
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SELECT width(box '((0,0),(1,1))') AS RESULT; result -------- 1 (1 row) |
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