/******************************************************************************

 * Project:  PROJ.4

 * Purpose:  Stub projection implementation for lat/long coordinates. We

 *           don't actually change the coordinates, but we want proj=latlong

 *           to act sort of like a projection.

 * Author:   Frank Warmerdam, warmerdam@pobox.com

 *

 ******************************************************************************

 * Copyright (c) 2000, Frank Warmerdam

 *

 * 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.

 *****************************************************************************/

/* very loosely based upon DMA code by Bradford W. Drew */

#include "proj_internal.h"

PROJ_HEAD(lonlat, "Lat/long (Geodetic)") "\n\t";

PROJ_HEAD(latlon, "Lat/long (Geodetic alias)") "\n\t";

PROJ_HEAD(latlong, "Lat/long (Geodetic alias)") "\n\t";

PROJ_HEAD(longlat, "Lat/long (Geodetic alias)") "\n\t";

static PJ_XY latlong_forward(PJ_LP lp, PJ *P) {

    PJ_XY xy = {0.0, 0.0};

    (void)P;

    xy.x = lp.lam;

    xy.y = lp.phi;

    return xy;

}

static PJ_LP latlong_inverse(PJ_XY xy, PJ *P) {

    PJ_LP lp = {0.0, 0.0};

    (void)P;

    lp.phi = xy.y;

    lp.lam = xy.x;

    return lp;

}

static PJ_XYZ latlong_forward_3d(PJ_LPZ lpz, PJ *P) {

    PJ_XYZ xyz = {0, 0, 0};

    (void)P;

    xyz.x = lpz.lam;

    xyz.y = lpz.phi;

    xyz.z = lpz.z;

    return xyz;

}

static PJ_LPZ latlong_inverse_3d(PJ_XYZ xyz, PJ *P) {

    PJ_LPZ lpz = {0, 0, 0};

    (void)P;

    lpz.lam = xyz.x;

    lpz.phi = xyz.y;

    lpz.z = xyz.z;

    return lpz;

}

static void latlong_forward_4d(PJ_COORD &, PJ *) {}

static void latlong_inverse_4d(PJ_COORD &, PJ *) {}

static PJ *latlong_setup(PJ *P) {

    P->is_latlong = 1;

    P->x0 = 0;

    P->y0 = 0;

    P->inv = latlong_inverse;

    P->fwd = latlong_forward;

    P->inv3d = latlong_inverse_3d;

    P->fwd3d = latlong_forward_3d;

    P->inv4d = latlong_inverse_4d;

    P->fwd4d = latlong_forward_4d;

    P->left = PJ_IO_UNITS_RADIANS;

    P->right = PJ_IO_UNITS_RADIANS;

    return P;

}

PJ *PJ_PROJECTION(latlong) { return latlong_setup(P); }

PJ *PJ_PROJECTION(longlat) { return latlong_setup(P); }

PJ *PJ_PROJECTION(latlon) { return latlong_setup(P); }

PJ *PJ_PROJECTION(lonlat) { return latlong_setup(P); }