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/* Gerris - The GNU Flow Solver
* Copyright (C) 2001-2011 National Institute of Water and Atmospheric Research
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <proj_api.h>
#include "simulation.h"
#include "map.h"
/* GfsMapProjection: Header */
typedef struct _GfsMapProjection GfsMapProjection;
struct _GfsMapProjection {
/*< private >*/
GfsMap parent;
projPJ pj;
gdouble cosa, sina;
/*< public >*/
gdouble lon, lat, angle;
};
#define GFS_MAP_PROJECTION(obj) GTS_OBJECT_CAST (obj,\
GfsMapProjection,\
gfs_map_projection_class ())
#define GFS_IS_MAP_PROJECTION(obj) (gts_object_is_from_class (obj,\
gfs_map_projection_class ()))
GfsMapClass * gfs_map_projection_class (void);
/* GfsMapProjection: Object */
static void gfs_map_projection_read (GtsObject ** o, GtsFile * fp)
{
(* GTS_OBJECT_CLASS (gfs_map_projection_class ())->parent_class->read) (o, fp);
if (fp->type == GTS_ERROR)
return;
GtsFileVariable var[] = {
{GTS_DOUBLE, "lon", TRUE},
{GTS_DOUBLE, "lat", TRUE},
{GTS_DOUBLE, "angle", TRUE},
{GTS_NONE}
};
GfsMapProjection * map = GFS_MAP_PROJECTION (*o);
var[0].data = &map->lon;
var[1].data = &map->lat;
var[2].data = &map->angle;
gts_file_assign_variables (fp, var);
if (fp->type == GTS_ERROR)
return;
map->cosa = cos (map->angle*DEG_TO_RAD);
map->sina = sin (map->angle*DEG_TO_RAD);
char * parms[] = {
"proj=lcc", /* Lambert Conformal Conic */
NULL, NULL, NULL, NULL
};
parms[1] = g_strdup_printf ("lon_0=%lf", map->lon);
parms[2] = g_strdup_printf ("lat_0=%lf", map->lat);
parms[3] = g_strdup_printf ("lat_1=%lf", map->lat);
parms[4] = g_strdup_printf ("lat_2=%lf", map->lat);
map->pj = pj_init (sizeof(parms)/sizeof(char *), parms);
if (!map->pj)
gts_file_error (fp, "cannot initialise projection");
g_free (parms[1]);
g_free (parms[2]);
g_free (parms[3]);
g_free (parms[4]);
}
static void gfs_map_projection_write (GtsObject * o, FILE * fp)
{
(* GTS_OBJECT_CLASS (gfs_map_projection_class ())->parent_class->write) (o, fp);
GfsMapProjection * map = GFS_MAP_PROJECTION (o);
fprintf (fp, " { lon = %.8g lat = %.8g angle = %g }",
map->lon, map->lat, map->angle);
}
static void gfs_map_projection_destroy (GtsObject * object)
{
if (GFS_MAP_PROJECTION (object)->pj)
pj_free (GFS_MAP_PROJECTION (object)->pj);
(* GTS_OBJECT_CLASS (gfs_map_projection_class ())->parent_class->destroy) (object);
}
static void projection_transform (GfsMap * map, const FttVector * src, FttVector * dest)
{
projLP idata;
projXY odata;
GfsMapProjection * m = GFS_MAP_PROJECTION (map);
gdouble L = gfs_object_simulation (map)->physical_params.L;
idata.u = src->x*L*DEG_TO_RAD;
idata.v = src->y*L*DEG_TO_RAD;
odata = pj_fwd (idata, m->pj);
dest->x = (odata.u*m->cosa - odata.v*m->sina)/L;
dest->y = (odata.v*m->cosa + odata.u*m->sina)/L;
dest->z = src->z;
}
static void projection_inverse (GfsMap * map, const FttVector * src, FttVector * dest)
{
projLP odata;
projXY idata;
GfsMapProjection * m = GFS_MAP_PROJECTION (map);
gdouble L = gfs_object_simulation (map)->physical_params.L;
idata.u = (src->x*m->cosa + src->y*m->sina)*L;
idata.v = (src->y*m->cosa - src->x*m->sina)*L;
odata = pj_inv (idata, GFS_MAP_PROJECTION (map)->pj);
dest->x = odata.u*RAD_TO_DEG/L;
dest->y = odata.v*RAD_TO_DEG/L;
dest->z = src->z;
}
static void projection_inverse_cell (GfsMap * map, const FttVector * src, FttVector * dest)
{
gint i;
FttVector o = { 0., 0., 0. };
for (i = 0; i < 4; i++) {
o.x += src[i].x;
o.y += src[i].y;
o.z += src[i].z;
projection_inverse (map, &(src[i]), &(dest[i]));
}
o.x /= 4.; o.y /= 4.; o.z /= 4.;
projection_inverse (map, &o, &o);
/* make sure we do not cross periodic longitude boundary */
gdouble L = gfs_object_simulation (map)->physical_params.L;
for (i = 0; i < 4; i++)
if (dest[i].x > o.x + 180./L)
dest[i].x -= 360./L;
else if (dest[i].x < o.x - 180./L)
dest[i].x += 360./L;
}
static void gfs_map_projection_class_init (GfsMapClass * klass)
{
GTS_OBJECT_CLASS (klass)->read = gfs_map_projection_read;
GTS_OBJECT_CLASS (klass)->write = gfs_map_projection_write;
GTS_OBJECT_CLASS (klass)->destroy = gfs_map_projection_destroy;
}
static void gfs_map_projection_init (GfsMapProjection * object)
{
/* Wellington */
object->lon = 174.777222;
object->lat = -41.288889;
object->angle = 0.; object->cosa = 1.; object->sina = 0.;
object->pj = NULL;
GFS_MAP (object)->transform = projection_transform;
GFS_MAP (object)->inverse = projection_inverse;
GFS_MAP (object)->inverse_cell = projection_inverse_cell;
}
GfsMapClass * gfs_map_projection_class (void)
{
static GfsMapClass * klass = NULL;
if (klass == NULL) {
GtsObjectClassInfo gfs_map_projection_info = {
"GfsMapProjection",
sizeof (GfsMapProjection),
sizeof (GfsMapClass),
(GtsObjectClassInitFunc) gfs_map_projection_class_init,
(GtsObjectInitFunc) gfs_map_projection_init,
(GtsArgSetFunc) NULL,
(GtsArgGetFunc) NULL
};
klass = gts_object_class_new (GTS_OBJECT_CLASS (gfs_map_class ()),
&gfs_map_projection_info);
}
return klass;
}
/* Initialize module */
/* only define gfs_module_name for "official" modules (i.e. those installed in
GFS_MODULES_DIR) */
const gchar gfs_module_name[] = "map";
const gchar * g_module_check_init (void);
const gchar * g_module_check_init (void)
{
gfs_map_projection_class ();
return NULL;
}
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