Convert from the Chip to Grating Dispersion Plane (GDP) coordinate system.
Array_Type pix_chip_to_gdp( Integer_Type chip_id, Double_Type x,
Double_Type y )
This routine converts a position in the Chip coordinate system
to the matching position in the Grating Dispersion Plane (GDP) coordinate system,
using the current settings of the pixlib module.
The inputs are chip ID (the ccd_id value for ACIS and chip_id
value for HRC data) and the chip location (x,y) in pixels.
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_chip_to_gdp( 2, 512, 512 )
chips> print( gdp )
41331.4
17286.2
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 chip position (512,512) on HRC-S2
corresponds to the location (4620, 3573)
in the GDP system.
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