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/******************************************************************************
* Project: PROJ.4
* Purpose: Inverse operation invocation
* Author: Thomas Knudsen, thokn@sdfe.dk, 2018-01-02
* Based on material from Gerald Evenden (original pj_inv)
* and Piyush Agram (original pj_inv3d)
*
******************************************************************************
* Copyright (c) 2000, Frank Warmerdam
* Copyright (c) 2018, Thomas Knudsen / SDFE
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include <errno.h>
#include <math.h>
#include "proj_internal.h"
#include "proj_math.h"
#include "projects.h"
#define INPUT_UNITS P->right
#define OUTPUT_UNITS P->left
static PJ_COORD inv_prepare (PJ *P, PJ_COORD coo) {
if (coo.v[0] == HUGE_VAL || coo.v[1] == HUGE_VAL || coo.v[2] == HUGE_VAL) {
proj_errno_set (P, PJD_ERR_INVALID_X_OR_Y);
return proj_coord_error ();
}
/* The helmert datum shift will choke unless it gets a sensible 4D coordinate */
if (HUGE_VAL==coo.v[2] && P->helmert) coo.v[2] = 0.0;
if (HUGE_VAL==coo.v[3] && P->helmert) coo.v[3] = 0.0;
if (P->axisswap)
coo = proj_trans (P->axisswap, PJ_INV, coo);
/* Handle remaining possible input types */
switch (INPUT_UNITS) {
case PJ_IO_UNITS_WHATEVER:
return coo;
/* de-scale and de-offset */
case PJ_IO_UNITS_CARTESIAN:
coo.xyz.x *= P->to_meter;
coo.xyz.y *= P->to_meter;
coo.xyz.z *= P->to_meter;
if (P->is_geocent) {
coo = proj_trans (P->cart, PJ_INV, coo);
}
return coo;
case PJ_IO_UNITS_PROJECTED:
case PJ_IO_UNITS_CLASSIC:
coo.xyz.x = P->to_meter * coo.xyz.x - P->x0;
coo.xyz.y = P->to_meter * coo.xyz.y - P->y0;
coo.xyz.z = P->vto_meter * coo.xyz.z - P->z0;
if (INPUT_UNITS==PJ_IO_UNITS_PROJECTED)
return coo;
/* Classic proj.4 functions expect plane coordinates in units of the semimajor axis */
/* Multiplying by ra, rather than dividing by a because the CalCOFI projection */
/* stomps on a and hence (apparently) depends on this to roundtrip correctly */
/* (CalCOFI avoids further scaling by stomping - but a better solution is possible) */
coo.xyz.x *= P->ra;
coo.xyz.y *= P->ra;
return coo;
case PJ_IO_UNITS_ANGULAR:
coo.lpz.z = P->vto_meter * coo.lpz.z - P->z0;
break;
}
/* Should not happen, so we could return pj_coord_err here */
return coo;
}
static PJ_COORD inv_finalize (PJ *P, PJ_COORD coo) {
if (coo.xyz.x == HUGE_VAL) {
proj_errno_set (P, PJD_ERR_INVALID_X_OR_Y);
return proj_coord_error ();
}
if (OUTPUT_UNITS==PJ_IO_UNITS_ANGULAR) {
/* Distance from central meridian, taking system zero meridian into account */
coo.lp.lam = coo.lp.lam + P->from_greenwich + P->lam0;
/* adjust longitude to central meridian */
if (0==P->over)
coo.lpz.lam = adjlon(coo.lpz.lam);
if (P->vgridshift)
coo = proj_trans (P->vgridshift, PJ_INV, coo); /* Go geometric from orthometric */
if (coo.lp.lam==HUGE_VAL)
return coo;
if (P->hgridshift)
coo = proj_trans (P->hgridshift, PJ_FWD, coo);
else if (P->helmert || (P->cart_wgs84 != 0 && P->cart != 0)) {
coo = proj_trans (P->cart, PJ_FWD, coo); /* Go cartesian in local frame */
if( P->helmert )
coo = proj_trans (P->helmert, PJ_FWD, coo); /* Step into WGS84 */
coo = proj_trans (P->cart_wgs84, PJ_INV, coo); /* Go back to angular using WGS84 ellps */
}
if (coo.lp.lam==HUGE_VAL)
return coo;
/* If input latitude was geocentrical, convert back to geocentrical */
if (P->geoc)
coo = pj_geocentric_latitude (P, PJ_FWD, coo);
}
return coo;
}
static PJ_COORD error_or_coord(PJ *P, PJ_COORD coord, int last_errno) {
if (proj_errno(P))
return proj_coord_error();
proj_errno_restore(P, last_errno);
return coord;
}
LP pj_inv(XY xy, PJ *P) {
int last_errno;
PJ_COORD coo = {{0,0,0,0}};
coo.xy = xy;
last_errno = proj_errno_reset(P);
if (!P->skip_inv_prepare)
coo = inv_prepare (P, coo);
if (HUGE_VAL==coo.v[0])
return proj_coord_error ().lp;
/* Do the transformation, using the lowest dimensional transformer available */
if (P->inv)
coo.lp = P->inv(coo.xy, P);
else if (P->inv3d)
coo.lpz = P->inv3d (coo.xyz, P);
else if (P->inv4d)
coo = P->inv4d (coo, P);
else {
proj_errno_set (P, EINVAL);
return proj_coord_error ().lp;
}
if (HUGE_VAL==coo.v[0])
return proj_coord_error ().lp;
if (!P->skip_inv_finalize)
coo = inv_finalize (P, coo);
return error_or_coord(P, coo, last_errno).lp;
}
LPZ pj_inv3d (XYZ xyz, PJ *P) {
int last_errno;
PJ_COORD coo = {{0,0,0,0}};
coo.xyz = xyz;
last_errno = proj_errno_reset(P);
if (!P->skip_inv_prepare)
coo = inv_prepare (P, coo);
if (HUGE_VAL==coo.v[0])
return proj_coord_error ().lpz;
/* Do the transformation, using the lowest dimensional transformer feasible */
if (P->inv3d)
coo.lpz = P->inv3d (coo.xyz, P);
else if (P->inv4d)
coo = P->inv4d (coo, P);
else if (P->inv)
coo.lp = P->inv (coo.xy, P);
else {
proj_errno_set (P, EINVAL);
return proj_coord_error ().lpz;
}
if (HUGE_VAL==coo.v[0])
return proj_coord_error ().lpz;
if (!P->skip_inv_finalize)
coo = inv_finalize (P, coo);
return error_or_coord(P, coo, last_errno).lpz;
}
PJ_COORD pj_inv4d (PJ_COORD coo, PJ *P) {
int last_errno = proj_errno_reset(P);
if (!P->skip_inv_prepare)
coo = inv_prepare (P, coo);
if (HUGE_VAL==coo.v[0])
return proj_coord_error ();
/* Call the highest dimensional converter available */
if (P->inv4d)
coo = P->inv4d (coo, P);
else if (P->inv3d)
coo.lpz = P->inv3d (coo.xyz, P);
else if (P->inv)
coo.lp = P->inv (coo.xy, P);
else {
proj_errno_set (P, EINVAL);
return proj_coord_error ();
}
if (HUGE_VAL==coo.v[0])
return proj_coord_error ();
if (!P->skip_inv_finalize)
coo = inv_finalize (P, coo);
return error_or_coord(P, coo, last_errno);
}
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