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A Library for Handling
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Description:
This routine returns
the geometric parameters describing the supplied
Circle.
Invocation
CALL AST_CIRCLEPARS( THIS,
CENTRE, RADIUS, P1, STATUS )
Arguments
THIS = INTEGER (Given)
CENTRE( ∗ )
= DOUBLE PRECISION (Returned)
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 = DOUBLE PRECISION (Returned)
Returned holding the
radius of the Circle, as an geodesic distance in the associated coordinate system.
P1(
∗ ) =
DOUBLE PRECISION (Returned)
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.
STATUS = INTEGER (Given and Returned)
The global status.
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
non-linear, 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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