git.maemo.org Git - navit-package/blob - navit/projection.c

   1 /**
   2  * Navit, a modular navigation system.
   3  * Copyright (C) 2005-2008 Navit Team
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include <string.h>
  21 #include <glib.h>
  22 #include "coord.h"
  23 #include "debug.h"
  24 #include "projection.h"
  25
  26 struct projection_name {
  27         enum projection projection;
  28         char *name;
  29 };
  30
  31
  32 struct projection_name projection_names[]={
  33         {projection_none, ""},
  34         {projection_mg, "mg"},
  35         {projection_garmin, "garmin"},
  36         {projection_utm, "utm"},
  37         {projection_gk, "gk"},
  38 };
  39
  40
  41 enum projection
  42 projection_from_name(const char *name, struct coord *offset)
  43 {
  44         int i;
  45         int zone;
  46         char ns;
  47
  48         for (i=0 ; i < sizeof(projection_names)/sizeof(struct projection_name) ; i++) {
  49                 if (! strcmp(projection_names[i].name, name))
  50                         return projection_names[i].projection;
  51         }
  52         if (offset) {
  53                 if (sscanf(name,"utm%d%c",&zone,&ns) == 2 && zone > 0 && zone <= 60 && (ns == 'n' || ns == 's')) {
  54                         offset->x=zone*1000000;
  55                         offset->y=(ns == 's' ? -10000000:0);
  56                         return projection_utm;
  57                 }
  58         }
  59         return projection_none;
  60 }
  61
  62 char *
  63 projection_to_name(enum projection proj, struct coord *offset)
  64 {
  65         int i;
  66
  67         for (i=0 ; i < sizeof(projection_names)/sizeof(struct projection_name) ; i++) {
  68                 if (projection_names[i].projection == proj)
  69                         return projection_names[i].name;
  70         }
  71         return NULL;
  72 }
  73