’s two possible coordinate transformations is considered the
"transformation (the other being the
"transformation). If the attribute value is zero (the default), the Mapping
’s behaviour will be the same as when it was first created. However, if it is non-zero, its two transformations will be inter-changed, so that the Mapping displays the inverse of its original behaviour.
Inverting the boolean sense of the Invert attribute will cause the values of a Mapping
’ s Nin and Nout
attributes to be interchanged. The values of its TranForward and TranInverse attributes will also be
interchanged. This operation may be performed with the AST_INVERT routine.