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