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A Library for Handling
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Description:
This function returns the geometric parameters
describing the supplied
Circle.
Synopsis
void astCirclePars( AstCircle
$\ast $this, double
$\ast $centre, double
$\ast $radius,
double $\ast $p1
)
Parameters:
this
centre
Pointer to an array in
which to return the coordinates of the Circle centre. The length of this array should
be no less than the number of axes in the associated coordinate system.
radius
Returned holding the radius of the Circle, as an geodesic distance in the associated
coordinate system.
p1
Pointer to an array in which to return the coordinates of a
point on the circumference of the Circle. The length of this array should be
no less than the number of axes in the associated coordinate system. A NULL
pointer can be supplied if the circumference position is not needed.
Notes:

If the coordinate system represented by the Circle has been changed since it was
first created, the returned parameters refer to the new (changed) coordinate
system, rather than the original coordinate system. Note however that if the
transformation from original to new coordinate system is nonlinear, the shape
represented by the supplied Circle object may not be an accurate circle.
Copyright (C) 2021 East Asian Observatory
 ←Prev
 AST
A Library for Handling
World
Coordinate Systems
in Astronomy  Next→
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