SUBROUTINE WCI_CNS2A( SPOS, PIXID, PRJID, APOS, STATUS ) *+ * Name: * WCI_CNA2S * Purpose: * Convert position in standard system to axis units * Language: * Starlink Fortran * Invocation: * CALL WCI_CNS2A( SPOS, PIXID, PRJID, APOS, STATUS ) * Description: * {routine_description} * Arguments: * SPOS[2] = DOUBLE (given) * Celestial position in radians * PIXID = INTEGER (given) * Pixellation object * PRJID = INTEGER (given) * Projection object * APOS[2] = REAL (returned) * Position in axis units relative to reference point * STATUS = INTEGER (given and returned) * The global status. * Examples: * {routine_example_text} * {routine_example_description} * Pitfalls: * {pitfall_description}... * Notes: * {routine_notes}... * Prior Requirements: * {routine_prior_requirements}... * Side Effects: * {routine_side_effects}... * Algorithm: * {algorithm_description}... * Accuracy: * {routine_accuracy} * Timing: * {routine_timing} * External Routines Used: * {name_of_facility_or_package}: * {routine_used}... * Implementation Deficiencies: * {routine_deficiencies}... * References: * WCI Subroutine Guide : http://www.sr.bham.ac.uk/asterix-docs/Programmer/Guides/wci.html * Keywords: * package:wci, usage:public * Copyright: * Copyright (C) University of Birmingham, 1995 * Authors: * DJA: David J. Allan (Jet-X, University of Birmingham) * {enter_new_authors_here} * History: * 5 Jan 1995 (DJA): * Original version. * {enter_changes_here} * Bugs: * {note_any_bugs_here} *- * Type Definitions: IMPLICIT NONE ! No implicit typing * Global Constants: INCLUDE 'SAE_PAR' ! Standard SAE constants INCLUDE 'MATH_PAR' INCLUDE 'AST_PKG' * Arguments Given: DOUBLE PRECISION SPOS(2) INTEGER PIXID, PRJID * Arguments Returned: REAL APOS(2) * Status: INTEGER STATUS ! Global status * External References: EXTERNAL AST_QPKGI LOGICAL AST_QPKGI * Local Variables: DOUBLE PRECISION LAPOS(2) ! Position in axis units DOUBLE PRECISION RPH(2) ! Relative physical posn DOUBLE PRECISION RPHP(2) ! Projected coords DOUBLE PRECISION RPHV(3) ! Cartesian RPH DOUBLE PRECISION STDV(3) ! Cartesian SPOS DOUBLE PRECISION UCONV(2) ! Unit conversions INTEGER DDIM ! # ADI values fetched INTEGER RPTR ! Rotation matrix ptr *. * Check inherited global status. IF ( STATUS .NE. SAI__OK ) RETURN * Check initialised IF ( .NOT. AST_QPKGI( WCI__PKG ) ) CALL WCI1_INIT( STATUS ) * Map the rotation matrix CALL ADI_CMAPD( PRJID, 'RMATRIX', 'READ', RPTR, STATUS ) * Generate 3-vector for SPOS CALL SLA_DCS2C( SPOS(1), SPOS(2), STDV ) * Rotate it back to native sphericals CALL SLA_DMXV( %VAL(RPTR), STDV, RPHV ) * Release rotation matrix CALL ADI_CUNMAP( PRJID, 'RMATRIX', RPTR, STATUS ) * Extract native sphericals CALL SLA_DCC2S( RPHV, RPH(1), RPH(2) ) * Feed through map projection CALL WCI_PROJ( RPH, PRJID, RPHP, STATUS ) * Rotate from native sphericals to axis units CALL WCI1_ROTA( RPHP, PIXID, .TRUE., LAPOS, STATUS ) * Restore axis conversion factors CALL ADI_CGET1D( PIXID, 'UCONV', 2, UCONV, DDIM, STATUS ) APOS(1) = LAPOS(1) / UCONV(1) APOS(2) = LAPOS(2) / UCONV(2) * Report any errors IF ( STATUS .NE. SAI__OK ) CALL AST_REXIT( 'WCI_CNS2A', STATUS ) END