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SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "@(#) unit_normals.c 1.12 05/08/19 SwRI" #include #include "ret_codes.h" #include "gen_defs.h" #include "user_defs.h" #include "libbase_idfs.h" #include "libVIDF.h" /******************************************************************************* * * * IR_GET_UNIT_NORMALS SUBROUTINE * * * * DESCRIPTION * * This routine is called to retrieve the three components of the aperture * * normal vector for each sensor from the parent instrument. These values * * are defined as constants in the VIDF file. Once the components have been * * retrieved, the magnitude of the normal vector is computed and saved. * * * * INPUT VARIABLES * * SDDAS_SHORT btime_yr the start time requested (year component) * * SDDAS_SHORT btime_day the start time requested (day component) * * SDDAS_LONG btime_sec the start time requested (seconds component)* * SDDAS_LONG btime_nsec the start time requested (nanoseconds) * * SDDAS_SHORT etime_yr the stop time requested (year component) * * SDDAS_SHORT etime_day the stop time requested (day component) * * SDDAS_LONG etime_sec the stop time requested (seconds component) * * SDDAS_LONG etime_nsec the stop time requested (nanoseconds) * * * * USAGE * * x = ir_get_unit_normals (btime_yr, btime_day, btime_sec, btime_nsec, * * etime_yr, etime_day, etime_sec, etime_nsec) * * * * NECESSARY SUBPROGRAMS * * ir_tento() returns the power of 10 value to multiply by* * to get values to the correct base (scaling) * * ReadVIDF() reads information from the VIDF file * * sqrt() returns the square root of the argument * * * * EXTERNAL VARIABLES * * struct general_info ginfo structure that holds information concerning * * the experiment that is being processed * * * * INTERNAL VARIABLES * * struct experiment_info *ex a pointer to the structure that holds * * specific experiment information * * register struct pitch_info a pointer to the structure that holds pitch * * *pa_ptr angle information * * register SDDAS_DOUBLE *dptr pointer to the unit normal values * * reg SDDAS_DOUBLE *mag_ptr pointer to magnitude values * * reg SDDAS_DOUBLE *vec_end loop termination variable * * register SDDAS_SHORT i, j looping variables * * SDDAS_ULONG data_key key which uniquely identifies the data set * * being processed * * SDDAS_DOUBLE sum1 the summation of the elements for the vector* * SDDAS_LONG ret_val holds value returned by called module * * SDDAS_LONG data_val constant value read from VIDF file * * SDDAS_LONG start_at_zero param. passed to ReadVIDF to avoid casting * * SDDAS_SHORT sensor the sensor being processed * * SDDAS_SHORT index index into the 3 element normal vector * * SDDAS_CHAR constant_id the constant id value * * SDDAS_CHAR constant_sca the scaling factor for the constant value * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ int ir_get_unit_normals (SDDAS_SHORT btime_yr, SDDAS_SHORT btime_day, SDDAS_LONG btime_sec, SDDAS_LONG btime_nsec, SDDAS_SHORT etime_yr, SDDAS_SHORT etime_day, SDDAS_LONG etime_sec, SDDAS_LONG etime_nsec) { extern struct general_info ginfo; struct experiment_info *ex; register struct pitch_info *pa_ptr; register SDDAS_DOUBLE *dptr, *mag_ptr, *vec_end; register SDDAS_SHORT i, j; SDDAS_ULONG data_key; SDDAS_DOUBLE sum1; SDDAS_LONG ret_val, data_val, start_at_zero; SDDAS_SHORT sensor, index; SDDAS_CHAR constant_id, constant_sca; /**************************************************************************/ /* Initialize the array that holds the unit normals to the detector */ /* apertures. For optimization purposes, it is advised to use ++x */ /* instead of x++. */ /**************************************************************************/ ex = ginfo.expt; data_key = ex->data_key; pa_ptr = ex->pitch_angles; dptr = pa_ptr->unit_normals; vec_end = pa_ptr->unit_normals + (3 * ex->num_sensor); for (; dptr < vec_end; ++dptr) *dptr = OUTSIDE_MIN; /**************************************************************************/ /* Retrieve the three unit normals. */ /**************************************************************************/ start_at_zero = 0; for (i = 0; i < ex->num_consts; ++i) { ret_val = ReadVIDF (data_key, btime_yr, btime_day, btime_sec, btime_nsec, etime_yr, etime_day, etime_sec, etime_nsec, &constant_id, _CONST_ID, i, start_at_zero, 1); if (ret_val < 0) return (ret_val); if (constant_id >= X_VEC_ID && constant_id <= Z_VEC_ID) { for (j = 0; j < ex->num_sensor; ++j) { /******************************************************************/ /* The order is x, y, z for id's 6, 7 and 8. */ /* Addition is faster than multiplication (used for dptr). */ /******************************************************************/ sensor = j; index = constant_id - X_VEC_ID; dptr = pa_ptr->unit_normals + (sensor + sensor + sensor) + index; /****************************************************************/ /* Retrieve the constant value, which is stored as a long. */ /****************************************************************/ ret_val = ReadVIDF (data_key, btime_yr, btime_day, btime_sec, btime_nsec, etime_yr, etime_day, etime_sec, etime_nsec, (SDDAS_CHAR *) &data_val, _VIDF_CONST, i, sensor, 1); if (ret_val < 0) return (ret_val); /******************************************************************/ /* Retrieve the scaling factor, which is stored as a char, and */ /* compute the unit normal for the individual component. */ /******************************************************************/ ret_val = ReadVIDF (data_key, btime_yr, btime_day, btime_sec, btime_nsec, etime_yr, etime_day, etime_sec, etime_nsec, &constant_sca, _CONST_SCA, i, sensor, 1); if (ret_val < 0) return (ret_val); *dptr = data_val * ir_tento (constant_sca); } } } /*************************************************************************/ /* Make sure all three components of the aperture normal vector were */ /* retrieved. Compute the magnitude of the unit normals. */ /* For optimization purposes, it is advised to use ++x instead of x++. */ /*************************************************************************/ mag_ptr = pa_ptr->mag_normal; dptr = pa_ptr->unit_normals; for (i = 0; i < ex->num_sensor; ++i, ++mag_ptr) { vec_end = dptr + 3; for (sum1 = 0.0; dptr < vec_end; ++dptr) { if (*dptr < VALID_MIN) return (PA_UNIT_NORMAL); sum1 += *dptr * *dptr; } *mag_ptr = sqrt (sum1); } return (ALL_OKAY); }