Diff of /trunk/src/osm-gps-map-osd-classic.c

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revision 124 by harbaum, Thu Sep 24 14:09:53 2009 UTC revision 133 by harbaum, Mon Oct 12 20:27:55 2009 UTC
# Line 82  typedef struct { Line 82  typedef struct {
82          cairo_surface_t *surface;          cairo_surface_t *surface;
83          float lat, lon;          float lat, lon;
84          char *name;          char *name;
85            gboolean imperial;    // display distance imperial/metric
86      } nav;      } nav;
87  #endif  #endif
88    
# Line 1072  osd_zoom_labels(cairo_t *cr, gint x, gin Line 1073  osd_zoom_labels(cairo_t *cr, gint x, gin
1073  #define OSD_COORDINATES_OFFSET (OSD_COORDINATES_FONT_SIZE/6)  #define OSD_COORDINATES_OFFSET (OSD_COORDINATES_FONT_SIZE/6)
1074    
1075  #define OSD_COORDINATES_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)  #define OSD_COORDINATES_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)
1076  #define OSD_COORDINATES_H  (2*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)  #define OSD_COORDINATES_H  (2*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET+OSD_COORDINATES_FONT_SIZE/4)
1077    
1078  /* these can be overwritten with versions that support */  /* these can be overwritten with versions that support */
1079  /* localization */  /* localization */
# Line 1209  osd_render_coordinates(osm_gps_map_osd_t Line 1210  osd_render_coordinates(osm_gps_map_osd_t
1210    
1211  #ifdef OSD_NAV  #ifdef OSD_NAV
1212  #define OSD_NAV_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)  #define OSD_NAV_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)
1213  #define OSD_NAV_H  (100)  #define OSD_NAV_H  (11*OSD_COORDINATES_FONT_SIZE)
1214    
1215    /* http://mathforum.org/library/drmath/view/55417.html */
1216    static float get_bearing(float lat1, float lon1, float lat2, float lon2) {
1217      return atan2( sin(lon2 - lon1) * cos(lat2),
1218                    cos(lat1) * sin(lat2) -
1219                    sin(lat1) * cos(lat2) * cos(lon2 - lon1));
1220    }
1221    
1222    /* http://mathforum.org/library/drmath/view/51722.html */
1223    static float get_distance(float lat1, float lon1, float lat2, float lon2) {
1224      float aob = acos(cos(lat1) * cos(lat2) * cos(lon2 - lon1) +
1225                       sin(lat1) * sin(lat2));
1226    
1227      //  return(aob * 3959.0);   /* great circle radius in miles */
1228    
1229      return(aob * 6371000.0);     /* great circle radius in meters */
1230    }
1231    
1232  static void  static void
1233  osd_render_nav(osm_gps_map_osd_t *osd)  osd_render_nav(osm_gps_map_osd_t *osd)
# Line 1222  osd_render_nav(osm_gps_map_osd_t *osd) Line 1240  osd_render_nav(osm_gps_map_osd_t *osd)
1240      /* first fill with transparency */      /* first fill with transparency */
1241      cairo_t *cr = cairo_create(priv->nav.surface);      cairo_t *cr = cairo_create(priv->nav.surface);
1242      cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);      cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
1243      cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.2);      cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
1244      cairo_paint(cr);      cairo_paint(cr);
1245      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);      cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
1246    
# Line 1242  osd_render_nav(osm_gps_map_osd_t *osd) Line 1260  osd_render_nav(osm_gps_map_osd_t *osd)
1260      g_free(latitude);      g_free(latitude);
1261      g_free(longitude);      g_free(longitude);
1262    
1263        /* draw the compass */
1264        int radius = (OSD_NAV_H - y - 5*OSD_COORDINATES_FONT_SIZE/4)/2;
1265        if(radius > OSD_NAV_W/2)
1266            radius = OSD_NAV_W/2;
1267    
1268        int x = OSD_NAV_W/2+1;
1269        y += radius;
1270    
1271        cairo_stroke (cr);
1272    
1273        /* draw background */
1274        cairo_arc(cr, x, y, radius, 0,  2*M_PI);
1275        cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
1276        cairo_fill_preserve (cr);
1277        cairo_set_source_rgb (cr, 0, 0, 0);
1278        cairo_set_line_width (cr, 1);
1279        cairo_stroke (cr);
1280    
1281        /* draw pointer */
1282    #define ARROW_WIDTH     0.3
1283    #define ARROW_LENGTH    0.7
1284    
1285        coord_t *gps = osm_gps_map_get_gps (OSM_GPS_MAP(osd->widget));
1286        if(gps) {
1287            float arot = get_bearing(gps->rlat, gps->rlon,
1288                         deg2rad(priv->nav.lat), deg2rad(priv->nav.lon));
1289    
1290            cairo_move_to(cr,
1291                          x + radius *  ARROW_LENGTH *  sin(arot),
1292                          y + radius *  ARROW_LENGTH * -cos(arot));
1293    
1294            cairo_line_to(cr,
1295                          x + radius * -ARROW_LENGTH *  sin(arot+ARROW_WIDTH),
1296                          y + radius * -ARROW_LENGTH * -cos(arot+ARROW_WIDTH));
1297    
1298            cairo_line_to(cr,
1299                          x + radius * -0.5 * ARROW_LENGTH *  sin(arot),
1300                          y + radius * -0.5 * ARROW_LENGTH * -cos(arot));
1301    
1302            cairo_line_to(cr,
1303                          x + radius * -ARROW_LENGTH *  sin(arot-ARROW_WIDTH),
1304                          y + radius * -ARROW_LENGTH * -cos(arot-ARROW_WIDTH));
1305    
1306            cairo_close_path(cr);
1307            cairo_set_source_rgb (cr, 0, 0, 0);
1308            cairo_fill (cr);
1309    
1310            y += radius + OSD_COORDINATES_FONT_SIZE/4;
1311    
1312            float dist = get_distance(gps->rlat, gps->rlon,
1313                            deg2rad(priv->nav.lat), deg2rad(priv->nav.lon));
1314    
1315            char *dist_str = NULL;
1316            if(!priv->nav.imperial) {
1317                /* metric is easy ... */
1318                if(dist<1000)
1319                    dist_str = g_strdup_printf("%u m", (int)dist);
1320                else
1321                    dist_str = g_strdup_printf("%.1f km", dist/1000);
1322            } else {
1323                /* and now the hard part: scale for useful imperial values :-( */
1324                /* try to convert to feet, 1ft == 0.3048 m */
1325    
1326                if(dist/(3*0.3048) >= 1760.0)      /* more than 1760 yard? */
1327                    dist_str = g_strdup_printf("%.1f mi", dist/(0.3048*3*1760.0));
1328                else if(dist/0.3048 >= 100)        /* more than 100 feet? */
1329                    dist_str = g_strdup_printf("%.1f yd", dist/(0.3048*3));
1330                else
1331                    dist_str = g_strdup_printf("%.0f ft", dist/0.3048);
1332            }
1333    
1334            y = osd_render_centered_text(cr, y, OSD_NAV_W, dist_str);
1335            g_free(dist_str);
1336        }
1337    
1338      cairo_destroy(cr);      cairo_destroy(cr);
1339  }  }
1340    
# Line 1265  void osm_gps_map_osd_clear_nav (OsmGpsMa Line 1358  void osm_gps_map_osd_clear_nav (OsmGpsMa
1358  }  }
1359    
1360  void  void
1361  osm_gps_map_osd_draw_nav (OsmGpsMap *map, float latitude, float longitude,  osm_gps_map_osd_draw_nav (OsmGpsMap *map, gboolean imperial,
1362                            char *name) {                            float latitude, float longitude, char *name) {
1363      g_return_if_fail (OSM_IS_GPS_MAP (map));      g_return_if_fail (OSM_IS_GPS_MAP (map));
1364    
1365      osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);      osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
# Line 1285  osm_gps_map_osd_draw_nav (OsmGpsMap *map Line 1378  osm_gps_map_osd_draw_nav (OsmGpsMap *map
1378      priv->nav.lat = latitude;      priv->nav.lat = latitude;
1379      priv->nav.lon = longitude;      priv->nav.lon = longitude;
1380      priv->nav.name = g_strdup(name);      priv->nav.name = g_strdup(name);
1381        priv->nav.imperial = imperial;
1382    
1383      osd_render_nav(osd);      osd_render_nav(osd);
1384    
Legend:
Removed from v.124  
changed lines
  Added in v.133