### AST_CIRCLEPARS

Returns the geometric parameters of an Circle

#### Description:

This routine returns the geometric parameters describing the supplied Circle.

#### Invocation

CALL AST_CIRCLEPARS( THIS, CENTRE, RADIUS, P1, STATUS )

#### Arguments

##### THIS = INTEGER (Given)
Pointer to the Region.
##### CENTRE( $\ast$ ) = 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( $\ast$ ) = 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.