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#define PJ_LIB__
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <time.h>
#include "proj_internal.h"
#include "proj_internal.h"
PROJ_HEAD(vgridshift, "Vertical grid shift");
namespace { // anonymous namespace
struct pj_opaque_vgridshift {
double t_final;
double t_epoch;
double forward_multiplier;
};
} // anonymous namespace
static PJ_XYZ forward_3d(PJ_LPZ lpz, PJ *P) {
struct pj_opaque_vgridshift *Q = (struct pj_opaque_vgridshift *) P->opaque;
PJ_COORD point = {{0,0,0,0}};
point.lpz = lpz;
if (P->vgridlist_geoid != nullptr) {
/* Only try the gridshift if at least one grid is loaded,
* otherwise just pass the coordinate through unchanged. */
point.xyz.z += Q->forward_multiplier * proj_vgrid_value(P, point.lp);
}
return point.xyz;
}
static PJ_LPZ reverse_3d(PJ_XYZ xyz, PJ *P) {
struct pj_opaque_vgridshift *Q = (struct pj_opaque_vgridshift *) P->opaque;
PJ_COORD point = {{0,0,0,0}};
point.xyz = xyz;
if (P->vgridlist_geoid != nullptr) {
/* Only try the gridshift if at least one grid is loaded,
* otherwise just pass the coordinate through unchanged. */
point.xyz.z -= Q->forward_multiplier * proj_vgrid_value(P, point.lp);
}
return point.lpz;
}
static PJ_COORD forward_4d(PJ_COORD obs, PJ *P) {
struct pj_opaque_vgridshift *Q = (struct pj_opaque_vgridshift *) P->opaque;
PJ_COORD point = obs;
/* If transformation is not time restricted, we always call it */
if (Q->t_final==0 || Q->t_epoch==0) {
point.xyz = forward_3d (obs.lpz, P);
return point;
}
/* Time restricted - only apply transform if within time bracket */
if (obs.lpzt.t < Q->t_epoch && Q->t_final > Q->t_epoch)
point.xyz = forward_3d (obs.lpz, P);
return point;
}
static PJ_COORD reverse_4d(PJ_COORD obs, PJ *P) {
struct pj_opaque_vgridshift *Q = (struct pj_opaque_vgridshift *) P->opaque;
PJ_COORD point = obs;
/* If transformation is not time restricted, we always call it */
if (Q->t_final==0 || Q->t_epoch==0) {
point.lpz = reverse_3d (obs.xyz, P);
return point;
}
/* Time restricted - only apply transform if within time bracket */
if (obs.lpzt.t < Q->t_epoch && Q->t_final > Q->t_epoch)
point.lpz = reverse_3d (obs.xyz, P);
return point;
}
PJ *TRANSFORMATION(vgridshift,0) {
struct pj_opaque_vgridshift *Q = static_cast<struct pj_opaque_vgridshift*>(pj_calloc (1, sizeof (struct pj_opaque_vgridshift)));
if (nullptr==Q)
return pj_default_destructor (P, ENOMEM);
P->opaque = (void *) Q;
if (!pj_param(P->ctx, P->params, "tgrids").i) {
proj_log_error(P, "vgridshift: +grids parameter missing.");
return pj_default_destructor(P, PJD_ERR_NO_ARGS);
}
/* TODO: Refactor into shared function that can be used */
/* by both vgridshift and hgridshift */
if (pj_param(P->ctx, P->params, "tt_final").i) {
Q->t_final = pj_param (P->ctx, P->params, "dt_final").f;
if (Q->t_final == 0) {
/* a number wasn't passed to +t_final, let's see if it was "now" */
/* and set the time accordingly. */
if (!strcmp("now", pj_param(P->ctx, P->params, "st_final").s)) {
time_t now;
struct tm *date;
time(&now);
date = localtime(&now);
Q->t_final = 1900.0 + date->tm_year + date->tm_yday/365.0;
}
}
}
if (pj_param(P->ctx, P->params, "tt_epoch").i)
Q->t_epoch = pj_param (P->ctx, P->params, "dt_epoch").f;
/* historical: the forward direction subtracts the grid offset. */
Q->forward_multiplier = -1.0;
if (pj_param(P->ctx, P->params, "tmultiplier").i) {
Q->forward_multiplier = pj_param(P->ctx, P->params, "dmultiplier").f;
}
/* Build gridlist. P->vgridlist_geoid can be empty if +grids only ask for optional grids. */
proj_vgrid_init(P, "grids");
/* Was gridlist compiled properly? */
if ( proj_errno(P) ) {
proj_log_error(P, "vgridshift: could not find required grid(s).");
return pj_default_destructor(P, PJD_ERR_FAILED_TO_LOAD_GRID);
}
P->fwd4d = forward_4d;
P->inv4d = reverse_4d;
P->fwd3d = forward_3d;
P->inv3d = reverse_3d;
P->fwd = nullptr;
P->inv = nullptr;
P->left = PJ_IO_UNITS_ANGULAR;
P->right = PJ_IO_UNITS_ANGULAR;
return P;
}
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