Convert from the Focal Plane (FPC) to Grating Dispersion Plane (GDP) coordinate system.
Array_Type pix_fpc_to_gdp( Double_Type x, Double_Type y )
This routine converts a position in the Focal Plane coordinate (FPC) system
to the matching position in the Grating Dispersion Plane (GDP) coordinate system,
using the current settings of the pixlib module.
The inputs (x,y) are the position in the FPC system.
The return value is a two-element array which gives the
GDP coordinates in pixels.
chips> require( "pixlib" )
chips> pix_init_pixlib
chips> pix_set_detector( "HRC-S" )
chips> gdp = pix_fpc_to_gdp( 42000, 17300 )
chips> print( gdp )
40545.9
169.415
Using the default settings of the pixlib module for the
HRC-S detector (i.e. the aimpoint is on HRC-S2), we
find that the FPC location (42000, 17300) corresponds
to the GDP position (40545.9, 169.415).
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