Pileus Git - grits/blob - src/gis-viewer.c

   1 /*
   2  * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /**
  19  * SECTION:gis-viewer
  20  * @short_description: Virtual globe base class
  21  *
  22  * #GisViewer is the base class for the virtual globe widget. It handles
  23  * everything not directly related to drawing the globe. Plugins and
  24  * applications using the viewer should normally talk to the viewer and not care
  25  * how it is implemented.
  26  */
  27
  28 #include <config.h>
  29 #include <math.h>
  30 #include <gtk/gtk.h>
  31 #include <gdk/gdkkeysyms.h>
  32
  33 #include "gis-marshal.h"
  34 #include "gis-viewer.h"
  35
  36 #include "gis-util.h"
  37
  38
  39 /* Constants */
  40 enum {
  41         SIG_TIME_CHANGED,
  42         SIG_LOCATION_CHANGED,
  43         SIG_ROTATION_CHANGED,
  44         SIG_REFRESH,
  45         SIG_OFFLINE,
  46         NUM_SIGNALS,
  47 };
  48 static guint signals[NUM_SIGNALS];
  49
  50
  51 /***********
  52  * Helpers *
  53  ***********/
  54 /* Misc helpers */
  55 static void _gis_viewer_fix_location(GisViewer *viewer)
  56 {
  57         while (viewer->location[0] <  -90) viewer->location[0] += 180;
  58         while (viewer->location[0] >   90) viewer->location[0] -= 180;
  59         while (viewer->location[1] < -180) viewer->location[1] += 360;
  60         while (viewer->location[1] >  180) viewer->location[1] -= 360;
  61         viewer->location[2] = ABS(viewer->location[2]);
  62 }
  63
  64 /* Signal helpers */
  65 static void _gis_viewer_emit_location_changed(GisViewer *viewer)
  66 {
  67         g_signal_emit(viewer, signals[SIG_LOCATION_CHANGED], 0,
  68                         viewer->location[0],
  69                         viewer->location[1],
  70                         viewer->location[2]);
  71 }
  72 static void _gis_viewer_emit_rotation_changed(GisViewer *viewer)
  73 {
  74         g_signal_emit(viewer, signals[SIG_ROTATION_CHANGED], 0,
  75                         viewer->rotation[0],
  76                         viewer->rotation[1],
  77                         viewer->rotation[2]);
  78 }
  79 static void _gis_viewer_emit_time_changed(GisViewer *viewer)
  80 {
  81         g_signal_emit(viewer, signals[SIG_TIME_CHANGED], 0,
  82                         viewer->time);
  83 }
  84 static void _gis_viewer_emit_refresh(GisViewer *viewer)
  85 {
  86         g_signal_emit(viewer, signals[SIG_REFRESH], 0);
  87 }
  88 static void _gis_viewer_emit_offline(GisViewer *viewer)
  89 {
  90         g_signal_emit(viewer, signals[SIG_OFFLINE], 0,
  91                         viewer->offline);
  92 }
  93
  94 /*************
  95  * Callbacks *
  96  *************/
  97 static gboolean on_key_press(GisViewer *viewer, GdkEventKey *event, gpointer _)
  98 {
  99         g_debug("GisViewer: on_key_press - key=%x, state=%x, plus=%x",
 100                         event->keyval, event->state, GDK_plus);
 101
 102         double lat, lon, elev, pan;
 103         gis_viewer_get_location(viewer, &lat, &lon, &elev);
 104         pan = MIN(elev/(EARTH_R/2), 30);
 105         gdk_threads_leave();
 106         switch (event->keyval) {
 107         case GDK_Left:  case GDK_h: gis_viewer_pan(viewer,  0,  -pan, 0); break;
 108         case GDK_Down:  case GDK_j: gis_viewer_pan(viewer, -pan, 0,   0); break;
 109         case GDK_Up:    case GDK_k: gis_viewer_pan(viewer,  pan, 0,   0); break;
 110         case GDK_Right: case GDK_l: gis_viewer_pan(viewer,  0,   pan, 0); break;
 111         case GDK_minus: case GDK_o: gis_viewer_zoom(viewer, 10./9); break;
 112         case GDK_plus:  case GDK_i: gis_viewer_zoom(viewer, 9./10); break;
 113         case GDK_H: gis_viewer_rotate(viewer,  0, 0, -2); break;
 114         case GDK_J: gis_viewer_rotate(viewer,  2, 0,  0); break;
 115         case GDK_K: gis_viewer_rotate(viewer, -2, 0,  0); break;
 116         case GDK_L: gis_viewer_rotate(viewer,  0, 0,  2); break;
 117         }
 118         return FALSE;
 119 }
 120
 121 static gboolean on_scroll(GisViewer *viewer, GdkEventScroll *event, gpointer _)
 122 {
 123         switch (event->direction) {
 124         case GDK_SCROLL_DOWN: gis_viewer_zoom(viewer, 10./9); break;
 125         case GDK_SCROLL_UP:   gis_viewer_zoom(viewer, 9./10); break;
 126         default: break;
 127         }
 128         return FALSE;
 129 }
 130
 131 enum {
 132         GIS_DRAG_NONE,
 133         GIS_DRAG_PAN,
 134         GIS_DRAG_ZOOM,
 135         GIS_DRAG_TILT,
 136 };
 137
 138 static gboolean on_button_press(GisViewer *viewer, GdkEventButton *event, gpointer _)
 139 {
 140         g_debug("GisViewer: on_button_press - %d", event->button);
 141         gtk_widget_grab_focus(GTK_WIDGET(viewer));
 142         switch (event->button) {
 143         case 1:  viewer->drag_mode = GIS_DRAG_PAN;  break;
 144         case 2:  viewer->drag_mode = GIS_DRAG_ZOOM; break;
 145         case 3:  viewer->drag_mode = GIS_DRAG_TILT; break;
 146         defualt: viewer->drag_mode = GIS_DRAG_NONE; break;
 147         }
 148         viewer->drag_x = event->x;
 149         viewer->drag_y = event->y;
 150         return FALSE;
 151 }
 152
 153 static gboolean on_button_release(GisViewer *viewer, GdkEventButton *event, gpointer _)
 154 {
 155         g_debug("GisViewer: on_button_release");
 156         viewer->drag_mode = GIS_DRAG_NONE;
 157         return FALSE;
 158 }
 159
 160 static gboolean on_motion_notify(GisViewer *viewer, GdkEventMotion *event, gpointer _)
 161 {
 162         gdouble x = viewer->drag_x - event->x;
 163         gdouble y = viewer->drag_y - event->y;
 164         gdouble lat, lon, elev, scale;
 165         gis_viewer_get_location(GIS_VIEWER(viewer), &lat, &lon, &elev);
 166         scale = elev/EARTH_R/15;
 167         switch (viewer->drag_mode) {
 168         case GIS_DRAG_PAN:  gis_viewer_pan(viewer, -y*scale, x*scale, 0); break;
 169         case GIS_DRAG_ZOOM: gis_viewer_zoom(viewer, pow(2, -y/500)); break;
 170         case GIS_DRAG_TILT: gis_viewer_rotate(viewer, y/10, 0, x/10); break;
 171         }
 172         viewer->drag_x = event->x;
 173         viewer->drag_y = event->y;
 174         return FALSE;
 175 }
 176
 177 static void on_view_changed(GisViewer *viewer,
 178                 gdouble _1, gdouble _2, gdouble _3)
 179 {
 180         gtk_widget_queue_draw(GTK_WIDGET(viewer));
 181 }
 182
 183 static void on_realize(GisViewer *viewer)
 184 {
 185         GdkCursor *cursor = gdk_cursor_new(GDK_FLEUR);
 186         GdkWindow *window = gtk_widget_get_window(GTK_WIDGET(viewer));
 187         gdk_window_set_cursor(window, cursor);
 188 }
 189
 190 /***********
 191  * Methods *
 192  ***********/
 193 /**
 194  * gis_viewer_setup:
 195  * @viewer:  the viewer
 196  * @plugins: a plugins store
 197  * @prefs:   a prefs store
 198  *
 199  * This should be called by objects which implement GisViewer somewhere in their
 200  * constructor.
 201  */
 202 void gis_viewer_setup(GisViewer *viewer, GisPlugins *plugins, GisPrefs *prefs)
 203 {
 204         viewer->plugins = plugins;
 205         viewer->prefs   = prefs;
 206         viewer->offline = gis_prefs_get_boolean(prefs, "gis/offline", NULL);
 207 }
 208
 209 /**
 210  * gis_viewer_set_time:
 211  * @viewer: the viewer
 212  * @time: the time to set the view to
 213  *
 214  * Set the current time for the view
 215  */
 216 void gis_viewer_set_time(GisViewer *viewer, time_t time)
 217 {
 218         g_assert(GIS_IS_VIEWER(viewer));
 219         g_debug("GisViewer: set_time - time=%ld", time);
 220         viewer->time = time;
 221         _gis_viewer_emit_time_changed(viewer);
 222 }
 223
 224 /**
 225  * gis_viewer_get_time:
 226  * @viewer: the viewer
 227  *
 228  * Get the time that is being viewed
 229  *
 230  * Returns: the current time
 231  */
 232 time_t gis_viewer_get_time(GisViewer *viewer)
 233 {
 234         g_assert(GIS_IS_VIEWER(viewer));
 235         g_debug("GisViewer: get_time");
 236         return viewer->time;
 237 }
 238
 239 /**
 240  * gis_viewer_set_location:
 241  * @viewer: the viewer
 242  * @lat:  the new latitude
 243  * @lon:  the new longitude
 244  * @elev: the new elevation
 245  *
 246  * Set the location for the camera
 247  */
 248 void gis_viewer_set_location(GisViewer *viewer, gdouble lat, gdouble lon, gdouble elev)
 249 {
 250         g_assert(GIS_IS_VIEWER(viewer));
 251         g_debug("GisViewer: set_location");
 252         viewer->location[0] = lat;
 253         viewer->location[1] = lon;
 254         viewer->location[2] = elev;
 255         _gis_viewer_fix_location(viewer);
 256         _gis_viewer_emit_location_changed(viewer);
 257 }
 258
 259 /**
 260  * gis_viewer_get_location:
 261  * @viewer: the viewer
 262  * @lat:  the location to store the latitude
 263  * @lon:  the location to store the longitude
 264  * @elev: the location to store the elevation
 265  *
 266  * Get the location of the camera
 267  */
 268 void gis_viewer_get_location(GisViewer *viewer, gdouble *lat, gdouble *lon, gdouble *elev)
 269 {
 270         g_assert(GIS_IS_VIEWER(viewer));
 271         //g_debug("GisViewer: get_location");
 272         *lat  = viewer->location[0];
 273         *lon  = viewer->location[1];
 274         *elev = viewer->location[2];
 275 }
 276
 277 /**
 278  * gis_viewer_pan:
 279  * @viewer: the viewer
 280  * @forward:  distance to move forward in meters
 281  * @right:    distance to move right in meters
 282  * @up:       distance to move up in meters
 283  *
 284  * Pan the location by a number of meters long the surface.
 285  *
 286  * Bugs: the distances are not in meters
 287  * Bugs: panning does not move in strait lines
 288  */
 289 void gis_viewer_pan(GisViewer *viewer, gdouble forward, gdouble sideways, gdouble up)
 290 {
 291         g_assert(GIS_IS_VIEWER(viewer));
 292         g_debug("GisViewer: pan - forward=%8.3f, sideways=%8.3f, up=%8.3f",
 293                         forward, sideways, up);
 294         gdouble dist   = sqrt(forward*forward + sideways*sideways);
 295         gdouble angle1 = deg2rad(viewer->rotation[2]);
 296         gdouble angle2 = atan2(sideways, forward);
 297         gdouble angle  = angle1 + angle2;
 298         /* This isn't accurate, but it's usable */
 299         viewer->location[0] += dist*cos(angle);
 300         viewer->location[1] += dist*sin(angle);
 301         viewer->location[2] += up;
 302         _gis_viewer_fix_location(viewer);
 303         _gis_viewer_emit_location_changed(viewer);
 304 }
 305
 306 /**
 307  * gis_viewer_zoom:
 308  * @viewer: the viewer
 309  * @scale: the scale to multiple the elevation by
 310  *
 311  * Multiple the elevation by a scale.
 312  */
 313 void gis_viewer_zoom(GisViewer *viewer, gdouble scale)
 314 {
 315         g_assert(GIS_IS_VIEWER(viewer));
 316         g_debug("GisViewer: zoom");
 317         viewer->location[2] *= scale;
 318         _gis_viewer_emit_location_changed(viewer);
 319 }
 320
 321 /**
 322  * gis_viewer_set_rotation:
 323  * @viewer: the viewer
 324  * @x: rotation new around the x axes
 325  * @y: rotation new around the y axes
 326  * @z: rotation new around the z axes
 327  *
 328  * Set the rotations in degrees around the x, y, and z axes.
 329  */
 330 void gis_viewer_set_rotation(GisViewer *viewer, gdouble x, gdouble y, gdouble z)
 331 {
 332         g_assert(GIS_IS_VIEWER(viewer));
 333         g_debug("GisViewer: set_rotation");
 334         viewer->rotation[0] = x;
 335         viewer->rotation[1] = y;
 336         viewer->rotation[2] = z;
 337         _gis_viewer_emit_rotation_changed(viewer);
 338 }
 339
 340 /**
 341  * gis_viewer_get_rotation:
 342  * @viewer: the viewer
 343  * @x: rotation around the x axes
 344  * @y: rotation around the y axes
 345  * @z: rotation around the z axes
 346  *
 347  * Get the rotations in degrees around the x, y, and z axes.
 348  */
 349 void gis_viewer_get_rotation(GisViewer *viewer, gdouble *x, gdouble *y, gdouble *z)
 350 {
 351         g_assert(GIS_IS_VIEWER(viewer));
 352         g_debug("GisViewer: get_rotation");
 353         *x = viewer->rotation[0];
 354         *y = viewer->rotation[1];
 355         *z = viewer->rotation[2];
 356 }
 357
 358 /**
 359  * gis_viewer_rotate:
 360  * @viewer: the viewer
 361  * @x: rotation around the x axes
 362  * @y: rotation around the y axes
 363  * @z: rotation around the z axes
 364  *
 365  * Add to the rotation around the x, y, and z axes.
 366  */
 367 void gis_viewer_rotate(GisViewer *viewer, gdouble x, gdouble y, gdouble z)
 368 {
 369         g_assert(GIS_IS_VIEWER(viewer));
 370         g_debug("GisViewer: rotate - x=%.0f, y=%.0f, z=%.0f", x, y, z);
 371         viewer->rotation[0] += x;
 372         viewer->rotation[1] += y;
 373         viewer->rotation[2] += z;
 374         _gis_viewer_emit_rotation_changed(viewer);
 375 }
 376
 377 /**
 378  * gis_viewer_refresh:
 379  * @viewer: the viewer
 380  *
 381  * Trigger the refresh signal. This will cause any remote data to be checked for
 382  * updates.
 383  */
 384 void gis_viewer_refresh(GisViewer *viewer)
 385 {
 386         g_debug("GisViewer: refresh");
 387         _gis_viewer_emit_refresh(viewer);
 388 }
 389
 390 /**
 391  * gis_viewer_set_offline:
 392  * @viewer: the viewer
 393  * @offline: %TRUE to enter offline mode
 394  *
 395  * Set the offline mode. If @offline is %TRUE, only locally cached data will be
 396  * used.
 397  */
 398 void gis_viewer_set_offline(GisViewer *viewer, gboolean offline)
 399 {
 400         g_assert(GIS_IS_VIEWER(viewer));
 401         g_debug("GisViewer: set_offline - %d", offline);
 402         gis_prefs_set_boolean(viewer->prefs, "gis/offline", offline);
 403         viewer->offline = offline;
 404         _gis_viewer_emit_offline(viewer);
 405 }
 406
 407 /**
 408  * gis_viewer_get_offline:
 409  * @viewer: the viewer
 410  *
 411  * Check if the viewer is in offline mode.
 412  *
 413  * Returns: %TRUE if the viewer is in offline mode.
 414  */
 415 gboolean gis_viewer_get_offline(GisViewer *viewer)
 416 {
 417         g_assert(GIS_IS_VIEWER(viewer));
 418         g_debug("GisViewer: get_offline - %d", viewer->offline);
 419         return viewer->offline;
 420 }
 421
 422 /***********************************
 423  * To be implemented by subclasses *
 424  ***********************************/
 425 /**
 426  * gis_viewer_center_position:
 427  * @viewer: the viewer
 428  * @lat:  the latitude
 429  * @lon:  the longitude
 430  * @elev: the elevation
 431  *
 432  * Center the viewer on a point. This can be used before drawing operations to
 433  * center the items a particular location.
 434  */
 435 void gis_viewer_center_position(GisViewer *viewer,
 436                 gdouble lat, gdouble lon, gdouble elev)
 437 {
 438         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 439         if (!klass->center_position)
 440                 g_warning("GisViewer: center_position - Unimplemented");
 441         klass->center_position(viewer, lat, lon, elev);
 442 }
 443
 444 /**
 445  * gis_viewer_project:
 446  * @viewer: the viewer
 447  * @lat:  the latitude
 448  * @lon:  the latitude
 449  * @elev: the latitude
 450  * @px:   the project x coordinate
 451  * @py:   the project y coordinate
 452  * @pz:   the project z coordinate
 453  *
 454  * Project a latitude, longitude, elevation point to to x, y, and z coordinates
 455  * in screen space. Useful for drawing orthographic data over a particular point
 456  * in space. E.g. #GisMarker.
 457  */
 458 void gis_viewer_project(GisViewer *viewer,
 459                 gdouble lat, gdouble lon, gdouble elev,
 460                 gdouble *px, gdouble *py, gdouble *pz)
 461 {
 462         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 463         if (!klass->project)
 464                 g_warning("GisViewer: project - Unimplemented");
 465         klass->project(viewer, lat, lon, elev, px, py, pz);
 466 }
 467
 468 /**
 469  * gis_viewer_clear_height_func:
 470  * @viewer: the viewer
 471  *
 472  * Clears the height function for the entire viewer. Useful when an elevation
 473  * plugin is unloaded.
 474  */
 475 void gis_viewer_clear_height_func(GisViewer *viewer)
 476 {
 477         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 478         if (!klass->clear_height_func)
 479                 g_warning("GisViewer: clear_height_func - Unimplemented");
 480         klass->clear_height_func(viewer);
 481 }
 482
 483 /**
 484  * gis_viewer_set_height_func:
 485  * @viewer:      the viewer
 486  * @tile:        the area to set the height function for
 487  * @height_func: the height function
 488  * @user_data:   user data to pass to the height function
 489  * @update:      %TRUE if the heights inside the tile should be updated.
 490  *
 491  * Set the height function to be used for a given part of the surface..
 492  */
 493 void gis_viewer_set_height_func(GisViewer *viewer, GisTile *tile,
 494                 GisHeightFunc height_func, gpointer user_data,
 495                 gboolean update)
 496 {
 497         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 498         if (!klass->set_height_func)
 499                 g_warning("GisViewer: set_height_func - Unimplemented");
 500         klass->set_height_func(viewer, tile, height_func, user_data, update);
 501 }
 502
 503 /**
 504  * gis_viewer_add:
 505  * @viewer: the viewer
 506  * @object: the object to add
 507  * @level:  the level to add the object to
 508  * @sort:   %TRUE if the object should be depth-sorted prior to being drawn
 509  *
 510  * Objects which are added to the viewer will be drawn on subsequent renderings
 511  * if their level of details is adequate.
 512  *
 513  * The @level represents the order the object should be drawn in, this is
 514  * unrelated to the objects actual position in the world.
 515  *
 516  * Semi-transparent objects should set @sort to %TRUE so that they are rendered
 517  * correctly when they overlap other semi-transparent objects.
 518  *
 519  * The viewer steals the objects reference. Call g_object_ref if you plan on
 520  * holding a reference as well.
 521  *
 522  * Returns: a handle to be pass to gis_viewer_remove()
 523  */
 524 gpointer gis_viewer_add(GisViewer *viewer, GisObject *object,
 525                 gint level, gboolean sort)
 526 {
 527         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 528         if (!klass->add)
 529                 g_warning("GisViewer: add - Unimplemented");
 530         return klass->add(viewer, object, level, sort);
 531 }
 532
 533 /**
 534  * gis_viewer_remove:
 535  * @viewer: the viewer
 536  * @ref:    the handle obtained from gis_viewer_add()
 537  *
 538  * Remove an object from the viewer. The objects reference count is decremented
 539  * prior to being removed.
 540  *
 541  * Returns: the #GisObject referenced by the handle
 542  */
 543 GisObject *gis_viewer_remove(GisViewer *viewer, gpointer ref)
 544 {
 545         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 546         if (!klass->remove)
 547                 g_warning("GisViewer: remove - Unimplemented");
 548         return klass->remove(viewer, ref);
 549 }
 550
 551 /****************
 552  * GObject code *
 553  ****************/
 554 G_DEFINE_ABSTRACT_TYPE(GisViewer, gis_viewer, GTK_TYPE_DRAWING_AREA);
 555 static void gis_viewer_init(GisViewer *viewer)
 556 {
 557         g_debug("GisViewer: init");
 558         /* Default values */
 559         viewer->location[0] = 40;
 560         viewer->location[1] = -100;
 561         viewer->location[2] = 1.5*EARTH_R;
 562         viewer->rotation[0] = 0;
 563         viewer->rotation[1] = 0;
 564         viewer->rotation[2] = 0;
 565
 566         g_object_set(viewer, "can-focus", TRUE, NULL);
 567         gtk_widget_add_events(GTK_WIDGET(viewer),
 568                         GDK_BUTTON_PRESS_MASK |
 569                         GDK_BUTTON_RELEASE_MASK |
 570                         GDK_POINTER_MOTION_MASK |
 571                         GDK_KEY_PRESS_MASK);
 572
 573         g_signal_connect(viewer, "key-press-event",      G_CALLBACK(on_key_press),      NULL);
 574         g_signal_connect(viewer, "scroll-event",         G_CALLBACK(on_scroll),         NULL);
 575
 576         g_signal_connect(viewer, "button-press-event",   G_CALLBACK(on_button_press),   NULL);
 577         g_signal_connect(viewer, "button-release-event", G_CALLBACK(on_button_release), NULL);
 578         g_signal_connect(viewer, "motion-notify-event",  G_CALLBACK(on_motion_notify),  NULL);
 579
 580         g_signal_connect(viewer, "location-changed",     G_CALLBACK(on_view_changed),   NULL);
 581         g_signal_connect(viewer, "rotation-changed",     G_CALLBACK(on_view_changed),   NULL);
 582
 583         g_signal_connect(viewer, "realize",              G_CALLBACK(on_realize),        NULL);
 584 }
 585 static void gis_viewer_finalize(GObject *gobject)
 586 {
 587         g_debug("GisViewer: finalize");
 588         GisViewer *viewer = GIS_VIEWER(gobject);
 589         G_OBJECT_CLASS(gis_viewer_parent_class)->finalize(gobject);
 590 }
 591 static void gis_viewer_class_init(GisViewerClass *klass)
 592 {
 593         g_debug("GisViewer: class_init");
 594         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 595         gobject_class->finalize     = gis_viewer_finalize;
 596
 597         /**
 598          * GisViewer::time-changed:
 599          * @viewer: the viewer.
 600          * @time:   the new time.
 601          *
 602          * The ::time-changed signal is emitted when the viewers current time
 603          * changers.
 604          */
 605         signals[SIG_TIME_CHANGED] = g_signal_new(
 606                         "time-changed",
 607                         G_TYPE_FROM_CLASS(gobject_class),
 608                         G_SIGNAL_RUN_LAST,
 609                         0,
 610                         NULL,
 611                         NULL,
 612                         g_cclosure_marshal_VOID__LONG,
 613                         G_TYPE_NONE,
 614                         1,
 615                         G_TYPE_LONG);
 616
 617         /**
 618          * GisViewer::location-changed:
 619          * @viewer: the viewer.
 620          * @lat:    the new latitude.
 621          * @lon:    the new longitude.
 622          * @elev:   the new elevation.
 623          *
 624          * The ::location-changed signal is emitted when the viewers camera
 625          * location changes.
 626          */
 627         signals[SIG_LOCATION_CHANGED] = g_signal_new(
 628                         "location-changed",
 629                         G_TYPE_FROM_CLASS(gobject_class),
 630                         G_SIGNAL_RUN_LAST,
 631                         0,
 632                         NULL,
 633                         NULL,
 634                         gis_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 635                         G_TYPE_NONE,
 636                         3,
 637                         G_TYPE_DOUBLE,
 638                         G_TYPE_DOUBLE,
 639                         G_TYPE_DOUBLE);
 640
 641         /**
 642          * GisViewer::rotation-changed:
 643          * @viewer: the viewer.
 644          * @x: rotation new around the x axes.
 645          * @y: rotation new around the y axes.
 646          * @z: rotation new around the z axes.
 647          *
 648          * The ::rotation-changed signal is emitted when the viewers cameras
 649          * rotation changes.
 650          */
 651         signals[SIG_ROTATION_CHANGED] = g_signal_new(
 652                         "rotation-changed",
 653                         G_TYPE_FROM_CLASS(gobject_class),
 654                         G_SIGNAL_RUN_LAST,
 655                         0,
 656                         NULL,
 657                         NULL,
 658                         gis_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 659                         G_TYPE_NONE,
 660                         3,
 661                         G_TYPE_DOUBLE,
 662                         G_TYPE_DOUBLE,
 663                         G_TYPE_DOUBLE);
 664
 665         /**
 666          * GisViewer::refresh:
 667          * @viewer: the viewer.
 668          *
 669          * The ::refresh signal is emitted when a refresh is needed. If you are
 670          * using real-time data from a remote server, you should connect to the
 671          * refresh signal and update the data when necessary.
 672          */
 673         signals[SIG_REFRESH] = g_signal_new(
 674                         "refresh",
 675                         G_TYPE_FROM_CLASS(gobject_class),
 676                         G_SIGNAL_RUN_LAST,
 677                         0,
 678                         NULL,
 679                         NULL,
 680                         g_cclosure_marshal_VOID__VOID,
 681                         G_TYPE_NONE,
 682                         0);
 683
 684         /**
 685          * GisViewer::offline:
 686          * @viewer:  the viewer.
 687          * @offline: %TRUE if the viewer going offline.
 688          *
 689          * The ::offline signal is emitted when the viewers offline mode
 690          * changes.
 691          */
 692         signals[SIG_OFFLINE] = g_signal_new(
 693                         "offline",
 694                         G_TYPE_FROM_CLASS(gobject_class),
 695                         G_SIGNAL_RUN_LAST,
 696                         0,
 697                         NULL,
 698                         NULL,
 699                         g_cclosure_marshal_VOID__BOOLEAN,
 700                         G_TYPE_NONE,
 701                         1,
 702                         G_TYPE_BOOLEAN);
 703 }