Normalise an array of axis values astAxNorm
"
oper"
.
No normalisation is possible for a simple Frame and so the supplied values
are returned unchanged. However, this may not be the case for specialised
sub-classes of Frame. For instance, a SkyFrame has a discontinuity at
zero longitude and so a longitude value can be expressed in the range
[-Pi,PI] or the
range [0,2PI].
See the "
Applicability:"
section below for details.
"
oper"
is 0, longitude values are returned in the range
[0,2PI].
If "
oper"
is 1, longitude values are returned in either the range
[0,2PI] or
[-PI,PI]. The choice is made so that that the resulting list has the smallest range.
Latitude values are always returned in the range [-PI,PI].