Convert from the Grating diffracted Angular coordinates (GAC) to Grating Dispersion Plane (GDP) coordinate system.
Array_Type pix_gac_to_gdp( Double_Type x, Double_Type y )
This routine converts a position in the Grating diffracted
Angular Coordinate (GAC) system
to the matching position in the Grating Dispersion Plane (GDP) coordinate system,
using the current settings of the pixlib module.
The x value gives the grating dispersion and
the y value the cross-dispersion coordinate, both given
in degrees.
The return value is a two-element array which gives the
GDP coordinates in pixels.
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