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A Library for Handling
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Description:
Each
Region (of any class) can have an
"
uncertainty
"
which specifies the uncertainties
associated with the boundary of the Region. This information is supplied in the form of
a second Region. The uncertainty in any point on the boundary of a Region is found by
shifting the associated
"
uncertainty
"
Region so that it is centred at the boundary
point being considered. The area covered by the shifted uncertainty Region then
represents the uncertainty in the boundary position. The uncertainty is assumed to be
the same for all points.
The uncertainty is usually specified when the Region is created, but this function
allows it to be changed at any time.
Synopsis
void astSetUnc( AstRegion
this,
AstRegion unc
)
Parameters:
this
Pointer to the Region which is to be assigned a new
uncertainty.
unc
Pointer to the new uncertainty Region. This must be of a class
for which all instances are centro-symetric (e.g.
Box,
Circle,
Ellipse, etc.)
or be a
Prism containing centro-symetric component Regions. A deep copy of
the supplied Region will be taken, so subsequent changes to the uncertainty
Region using the supplied pointer will have no effect on the Region
"
this
"
.
Copyright (C) 2014 Science & Technology Facilities Council
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A Library for
Handling
World Coordinate Systems
in Astronomy - Next→
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