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