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<H2><A NAME="SECTION000207000000000000000"></A><A NAME="ss:restrictedintramaps"></A>
<BR>
Restricted Implementations of Transformation Functions
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<P>
You may not always want to use both the forward and inverse
transformations when you create an IntraMapIntraMap, so it is possible to omit
either from the underlying coordinate transformation
function. Consider the following, for example:
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WIDTH="565" HEIGHT="242" ALIGN="BOTTOM" BORDER="0"
SRC="img282.png"
ALT="\begin{terminalv}
void Poly3Tran( AstMapping *this, int npoint, int ncoord_in,
...
...AD :
6.18 + x * ( 0.12 + x * ( -0.003 + x * 0.0000101 ) );
}
}
\end{terminalv}">
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</SMALL>
<P>
This implements a 1-dimensional cubic polynomial transformation. Since
this is somewhat awkward to invert, however, we have only implemented
the forward transformation. When registering the function, this is
indicated via the ``flags'' argument to astIntraRegastIntraReg, as follows:
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SRC="img283.png"
ALT="\begin{terminalv}
void Poly3Tran( AstMapping *, int, int, const double *[], int,...
...ran'', 1, 1, Poly3Tran, AST__NOINV,
purpose, author, contact );
\end{terminalv}">
<BR>
</SMALL>
<P>
Here, the fifth argument has been set to the flag value AST__NOINV
to indicate the lack of an inverse. If the forward transformation were
absent, we would use AST__NOFOR instead. Flag values for this
argument may be combined using a bitwise OR if necessary.
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