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+/******************************************************************************
+ * Project: PROJ.4
+ * Purpose: Forward operation invocation
+ * Author: Thomas Knudsen, thokn@sdfe.dk, 2018-01-02
+ * Based on material from Gerald Evenden (original pj_fwd)
+ * and Piyush Agram (original pj_fwd3d)
+ *
+ ******************************************************************************
+ * 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->left
+#define OUTPUT_UNITS P->right
+
+
+static PJ_COORD fwd_prepare (PJ *P, PJ_COORD coo) {
+ if (HUGE_VAL==coo.v[0] || HUGE_VAL==coo.v[1] || HUGE_VAL==coo.v[2])
+ 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;
+
+ /* Check validity of angular input coordinates */
+ if (INPUT_UNITS==PJ_IO_UNITS_ANGULAR) {
+ double t;
+
+ /* check for latitude or longitude over-range */
+ t = (coo.lp.phi < 0 ? -coo.lp.phi : coo.lp.phi) - M_HALFPI;
+ if (t > PJ_EPS_LAT || coo.lp.lam > 10 || coo.lp.lam < -10) {
+ proj_errno_set (P, PJD_ERR_LAT_OR_LON_EXCEED_LIMIT);
+ return proj_coord_error ();
+ }
+
+ /* Clamp latitude to -90..90 degree range */
+ if (coo.lp.phi > M_HALFPI)
+ coo.lp.phi = M_HALFPI;
+ if (coo.lp.phi < -M_HALFPI)
+ coo.lp.phi = -M_HALFPI;
+
+ /* If input latitude is geocentrical, convert to geographical */
+ if (P->geoc)
+ coo = pj_geocentric_latitude (P, PJ_INV, coo);
+
+ /* Ensure longitude is in the -pi:pi range */
+ if (0==P->over)
+ coo.lp.lam = adjlon(coo.lp.lam);
+
+ if (P->hgridshift)
+ coo = proj_trans (P->hgridshift, PJ_INV, coo);
+ else if (P->helmert || (P->cart_wgs84 != nullptr && P->cart != nullptr)) {
+ coo = proj_trans (P->cart_wgs84, PJ_FWD, coo); /* Go cartesian in WGS84 frame */
+ if( P->helmert )
+ coo = proj_trans (P->helmert, PJ_INV, coo); /* Step into local frame */
+ coo = proj_trans (P->cart, PJ_INV, coo); /* Go back to angular using local ellps */
+ }
+ if (coo.lp.lam==HUGE_VAL)
+ return coo;
+ if (P->vgridshift)
+ coo = proj_trans (P->vgridshift, PJ_FWD, coo); /* Go orthometric from geometric */
+
+ /* Distance from central meridian, taking system zero meridian into account */
+ coo.lp.lam = (coo.lp.lam - P->from_greenwich) - P->lam0;
+
+ /* Ensure longitude is in the -pi:pi range */
+ if (0==P->over)
+ coo.lp.lam = adjlon(coo.lp.lam);
+
+ return coo;
+ }
+
+
+ /* We do not support gridshifts on cartesian input */
+ if (INPUT_UNITS==PJ_IO_UNITS_CARTESIAN && P->helmert)
+ return proj_trans (P->helmert, PJ_INV, coo);
+ return coo;
+}
+
+
+static PJ_COORD fwd_finalize (PJ *P, PJ_COORD coo) {
+
+ switch (OUTPUT_UNITS) {
+
+ /* Handle false eastings/northings and non-metric linear units */
+ case PJ_IO_UNITS_CARTESIAN:
+
+ if (P->is_geocent) {
+ coo = proj_trans (P->cart, PJ_FWD, coo);
+ }
+ coo.xyz.x *= P->fr_meter;
+ coo.xyz.y *= P->fr_meter;
+ coo.xyz.z *= P->fr_meter;
+
+ break;
+
+ /* Classic proj.4 functions return plane coordinates in units of the semimajor axis */
+ case PJ_IO_UNITS_CLASSIC:
+ coo.xy.x *= P->a;
+ coo.xy.y *= P->a;
+
+ /* Falls through */ /* (<-- GCC warning silencer) */
+ /* to continue processing in common with PJ_IO_UNITS_PROJECTED */
+ case PJ_IO_UNITS_PROJECTED:
+ coo.xyz.x = P->fr_meter * (coo.xyz.x + P->x0);
+ coo.xyz.y = P->fr_meter * (coo.xyz.y + P->y0);
+ coo.xyz.z = P->vfr_meter * (coo.xyz.z + P->z0);
+ break;
+
+ case PJ_IO_UNITS_WHATEVER:
+ break;
+
+ case PJ_IO_UNITS_ANGULAR:
+ coo.lpz.z = P->vfr_meter * (coo.lpz.z + P->z0);
+
+ if( P->is_long_wrap_set ) {
+ if( coo.lpz.lam != HUGE_VAL ) {
+ coo.lpz.lam = P->long_wrap_center +
+ adjlon(coo.lpz.lam - P->long_wrap_center);
+ }
+ }
+
+ break;
+ }
+
+ if (P->axisswap)
+ coo = proj_trans (P->axisswap, 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;
+}
+
+
+XY pj_fwd(LP lp, PJ *P) {
+ int last_errno;
+ PJ_COORD coo = {{0,0,0,0}};
+ coo.lp = lp;
+
+ last_errno = proj_errno_reset(P);
+
+ if (!P->skip_fwd_prepare)
+ coo = fwd_prepare (P, coo);
+ if (HUGE_VAL==coo.v[0] || HUGE_VAL==coo.v[1])
+ return proj_coord_error ().xy;
+
+ /* Do the transformation, using the lowest dimensional transformer available */
+ if (P->fwd)
+ coo.xy = P->fwd(coo.lp, P);
+ else if (P->fwd3d)
+ coo.xyz = P->fwd3d (coo.lpz, P);
+ else if (P->fwd4d)
+ coo = P->fwd4d (coo, P);
+ else {
+ proj_errno_set (P, EINVAL);
+ return proj_coord_error ().xy;
+ }
+ if (HUGE_VAL==coo.v[0])
+ return proj_coord_error ().xy;
+
+ if (!P->skip_fwd_finalize)
+ coo = fwd_finalize (P, coo);
+
+ return error_or_coord(P, coo, last_errno).xy;
+}
+
+
+
+XYZ pj_fwd3d(LPZ lpz, PJ *P) {
+ int last_errno;
+ PJ_COORD coo = {{0,0,0,0}};
+ coo.lpz = lpz;
+
+ last_errno = proj_errno_reset(P);
+
+ if (!P->skip_fwd_prepare)
+ coo = fwd_prepare (P, coo);
+ if (HUGE_VAL==coo.v[0])
+ return proj_coord_error ().xyz;
+
+ /* Do the transformation, using the lowest dimensional transformer feasible */
+ if (P->fwd3d)
+ coo.xyz = P->fwd3d(coo.lpz, P);
+ else if (P->fwd4d)
+ coo = P->fwd4d (coo, P);
+ else if (P->fwd)
+ coo.xy = P->fwd (coo.lp, P);
+ else {
+ proj_errno_set (P, EINVAL);
+ return proj_coord_error ().xyz;
+ }
+ if (HUGE_VAL==coo.v[0])
+ return proj_coord_error ().xyz;
+
+ if (!P->skip_fwd_finalize)
+ coo = fwd_finalize (P, coo);
+
+ return error_or_coord(P, coo, last_errno).xyz;
+}
+
+
+
+PJ_COORD pj_fwd4d (PJ_COORD coo, PJ *P) {
+ int last_errno = proj_errno_reset(P);
+
+ if (!P->skip_fwd_prepare)
+ coo = fwd_prepare (P, coo);
+ if (HUGE_VAL==coo.v[0])
+ return proj_coord_error ();
+
+ /* Call the highest dimensional converter available */
+ if (P->fwd4d)
+ coo = P->fwd4d (coo, P);
+ else if (P->fwd3d)
+ coo.xyz = P->fwd3d (coo.lpz, P);
+ else if (P->fwd)
+ coo.xy = P->fwd (coo.lp, P);
+ else {
+ proj_errno_set (P, EINVAL);
+ return proj_coord_error ();
+ }
+ if (HUGE_VAL==coo.v[0])
+ return proj_coord_error ();
+
+ if (!P->skip_fwd_finalize)
+ coo = fwd_finalize (P, coo);
+
+ return error_or_coord(P, coo, last_errno);
+}
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