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

   1 /*
   2  * Copyright (C) 2009-2011 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:grits-viewer
  20  * @short_description: Virtual globe base class
  21  *
  22  * #GritsViewer 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 "grits-marshal.h"
  34 #include "grits-viewer.h"
  35
  36 #include "grits-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 _grits_viewer_fix_location(GritsViewer *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 _grits_viewer_emit_location_changed(GritsViewer *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 _grits_viewer_emit_rotation_changed(GritsViewer *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 _grits_viewer_emit_time_changed(GritsViewer *viewer)
  80 {
  81         g_signal_emit(viewer, signals[SIG_TIME_CHANGED], 0,
  82                         viewer->time);
  83 }
  84 static void _grits_viewer_emit_refresh(GritsViewer *viewer)
  85 {
  86         g_signal_emit(viewer, signals[SIG_REFRESH], 0);
  87 }
  88 static void _grits_viewer_emit_offline(GritsViewer *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(GritsViewer *viewer, GdkEventKey *event, gpointer _)
  98 {
  99         g_debug("GritsViewer: on_key_press - key=%x, state=%x, plus=%x",
 100                         event->keyval, event->state, GDK_plus);
 101
 102         double lat, lon, elev, pan;
 103         grits_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: grits_viewer_pan(viewer,  0,  -pan, 0); break;
 107         case GDK_Down:  case GDK_j: grits_viewer_pan(viewer, -pan, 0,   0); break;
 108         case GDK_Up:    case GDK_k: grits_viewer_pan(viewer,  pan, 0,   0); break;
 109         case GDK_Right: case GDK_l: grits_viewer_pan(viewer,  0,   pan, 0); break;
 110         case GDK_minus: case GDK_o: grits_viewer_zoom(viewer, 10./9); break;
 111         case GDK_plus:  case GDK_i: grits_viewer_zoom(viewer, 9./10); break;
 112         case GDK_H: grits_viewer_rotate(viewer,  0, 0, -2); break;
 113         case GDK_J: grits_viewer_rotate(viewer,  2, 0,  0); break;
 114         case GDK_K: grits_viewer_rotate(viewer, -2, 0,  0); break;
 115         case GDK_L: grits_viewer_rotate(viewer,  0, 0,  2); break;
 116         }
 117         return FALSE;
 118 }
 119
 120 static gboolean on_scroll(GritsViewer *viewer, GdkEventScroll *event, gpointer _)
 121 {
 122         switch (event->direction) {
 123         case GDK_SCROLL_DOWN: grits_viewer_zoom(viewer, 10./9); break;
 124         case GDK_SCROLL_UP:   grits_viewer_zoom(viewer, 9./10); break;
 125         default: break;
 126         }
 127         return FALSE;
 128 }
 129
 130 enum {
 131         GRITS_DRAG_NONE,
 132         GRITS_DRAG_PAN,
 133         GRITS_DRAG_ZOOM,
 134         GRITS_DRAG_TILT,
 135 };
 136
 137 static gboolean on_button_press(GritsViewer *viewer, GdkEventButton *event, gpointer _)
 138 {
 139         g_debug("GritsViewer: on_button_press - %d", event->button);
 140         gtk_widget_grab_focus(GTK_WIDGET(viewer));
 141         switch (event->button) {
 142         case 1:  viewer->drag_mode = GRITS_DRAG_PAN;  break;
 143         case 2:  viewer->drag_mode = GRITS_DRAG_ZOOM; break;
 144         case 3:  viewer->drag_mode = GRITS_DRAG_TILT; break;
 145         default: viewer->drag_mode = GRITS_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(GritsViewer *viewer, GdkEventButton *event, gpointer _)
 153 {
 154         g_debug("GritsViewer: on_button_release");
 155         viewer->drag_mode = GRITS_DRAG_NONE;
 156         return FALSE;
 157 }
 158
 159 static gboolean on_motion_notify(GritsViewer *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, rx, ry, rz;
 164         grits_viewer_get_location(GRITS_VIEWER(viewer), &lat, &lon, &elev);
 165         grits_viewer_get_rotation(GRITS_VIEWER(viewer), &rx,  &ry,  &rz);
 166         scale = (elev/EARTH_R/14.1) * (sin(deg2rad(ABS(rx)))*4+1);
 167         switch (viewer->drag_mode) {
 168         case GRITS_DRAG_PAN:  grits_viewer_pan(viewer, -y*scale*0.782, x*scale, 0); break;
 169         case GRITS_DRAG_ZOOM: grits_viewer_zoom(viewer, pow(2, -y/500)); break;
 170         case GRITS_DRAG_TILT: grits_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(GritsViewer *viewer,
 178                 gdouble _1, gdouble _2, gdouble _3)
 179 {
 180         gtk_widget_queue_draw(GTK_WIDGET(viewer));
 181 }
 182
 183 /***********
 184  * Methods *
 185  ***********/
 186 /**
 187  * grits_viewer_setup:
 188  * @viewer:  the viewer
 189  * @plugins: a plugins store
 190  * @prefs:   a prefs store
 191  *
 192  * This should be called by objects which implement GritsViewer somewhere in their
 193  * constructor.
 194  */
 195 void grits_viewer_setup(GritsViewer *viewer, GritsPlugins *plugins, GritsPrefs *prefs)
 196 {
 197         viewer->plugins = plugins;
 198         viewer->prefs   = prefs;
 199         viewer->offline = grits_prefs_get_boolean(prefs, "grits/offline", NULL);
 200 }
 201
 202 /**
 203  * grits_viewer_set_time:
 204  * @viewer: the viewer
 205  * @time: the time to set the view to
 206  *
 207  * Set the current time for the view
 208  */
 209 void grits_viewer_set_time(GritsViewer *viewer, time_t time)
 210 {
 211         g_assert(GRITS_IS_VIEWER(viewer));
 212         g_debug("GritsViewer: set_time - time=%ld", time);
 213         viewer->time = time;
 214         _grits_viewer_emit_time_changed(viewer);
 215 }
 216
 217 /**
 218  * grits_viewer_get_time:
 219  * @viewer: the viewer
 220  *
 221  * Get the time that is being viewed
 222  *
 223  * Returns: the current time
 224  */
 225 time_t grits_viewer_get_time(GritsViewer *viewer)
 226 {
 227         g_assert(GRITS_IS_VIEWER(viewer));
 228         g_debug("GritsViewer: get_time");
 229         return viewer->time;
 230 }
 231
 232 /**
 233  * grits_viewer_set_location:
 234  * @viewer: the viewer
 235  * @lat:  the new latitude
 236  * @lon:  the new longitude
 237  * @elev: the new elevation
 238  *
 239  * Set the location for the camera
 240  */
 241 void grits_viewer_set_location(GritsViewer *viewer, gdouble lat, gdouble lon, gdouble elev)
 242 {
 243         g_assert(GRITS_IS_VIEWER(viewer));
 244         g_debug("GritsViewer: set_location");
 245         viewer->location[0] = lat;
 246         viewer->location[1] = lon;
 247         viewer->location[2] = elev;
 248         _grits_viewer_fix_location(viewer);
 249         _grits_viewer_emit_location_changed(viewer);
 250 }
 251
 252 /**
 253  * grits_viewer_get_location:
 254  * @viewer: the viewer
 255  * @lat:  the location to store the latitude
 256  * @lon:  the location to store the longitude
 257  * @elev: the location to store the elevation
 258  *
 259  * Get the location of the camera
 260  */
 261 void grits_viewer_get_location(GritsViewer *viewer, gdouble *lat, gdouble *lon, gdouble *elev)
 262 {
 263         g_assert(GRITS_IS_VIEWER(viewer));
 264         //g_debug("GritsViewer: get_location");
 265         *lat  = viewer->location[0];
 266         *lon  = viewer->location[1];
 267         *elev = viewer->location[2];
 268 }
 269
 270 /**
 271  * grits_viewer_pan:
 272  * @viewer: the viewer
 273  * @forward:  distance to move forward in meters
 274  * @right:    distance to move right in meters
 275  * @up:       distance to move up in meters
 276  *
 277  * Pan the location by a number of meters long the surface.
 278  *
 279  * Bugs: the distances are not in meters
 280  * Bugs: panning does not move in strait lines
 281  */
 282 void grits_viewer_pan(GritsViewer *viewer, gdouble forward, gdouble sideways, gdouble up)
 283 {
 284         g_assert(GRITS_IS_VIEWER(viewer));
 285         g_debug("GritsViewer: pan - forward=%8.3f, sideways=%8.3f, up=%8.3f",
 286                         forward, sideways, up);
 287         gdouble dist   = sqrt(forward*forward + sideways*sideways);
 288         gdouble angle1 = deg2rad(viewer->rotation[2]);
 289         gdouble angle2 = atan2(sideways, forward);
 290         gdouble angle  = angle1 + angle2;
 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         _grits_viewer_fix_location(viewer);
 296         _grits_viewer_emit_location_changed(viewer);
 297 }
 298
 299 /**
 300  * grits_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 grits_viewer_zoom(GritsViewer *viewer, gdouble scale)
 307 {
 308         g_assert(GRITS_IS_VIEWER(viewer));
 309         g_debug("GritsViewer: zoom");
 310         viewer->location[2] *= scale;
 311         _grits_viewer_emit_location_changed(viewer);
 312 }
 313
 314 /**
 315  * grits_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 grits_viewer_set_rotation(GritsViewer *viewer, gdouble x, gdouble y, gdouble z)
 324 {
 325         g_assert(GRITS_IS_VIEWER(viewer));
 326         g_debug("GritsViewer: set_rotation");
 327         viewer->rotation[0] = x;
 328         viewer->rotation[1] = y;
 329         viewer->rotation[2] = z;
 330         _grits_viewer_emit_rotation_changed(viewer);
 331 }
 332
 333 /**
 334  * grits_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 grits_viewer_get_rotation(GritsViewer *viewer, gdouble *x, gdouble *y, gdouble *z)
 343 {
 344         g_assert(GRITS_IS_VIEWER(viewer));
 345         //g_debug("GritsViewer: get_rotation");
 346         *x = viewer->rotation[0];
 347         *y = viewer->rotation[1];
 348         *z = viewer->rotation[2];
 349 }
 350
 351 /**
 352  * grits_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 grits_viewer_rotate(GritsViewer *viewer, gdouble x, gdouble y, gdouble z)
 361 {
 362         g_assert(GRITS_IS_VIEWER(viewer));
 363         g_debug("GritsViewer: 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         _grits_viewer_emit_rotation_changed(viewer);
 368 }
 369
 370 /**
 371  * grits_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 grits_viewer_refresh(GritsViewer *viewer)
 378 {
 379         g_debug("GritsViewer: refresh");
 380         _grits_viewer_emit_refresh(viewer);
 381 }
 382
 383 /**
 384  * grits_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 grits_viewer_set_offline(GritsViewer *viewer, gboolean offline)
 392 {
 393         g_assert(GRITS_IS_VIEWER(viewer));
 394         g_debug("GritsViewer: set_offline - %d", offline);
 395         grits_prefs_set_boolean(viewer->prefs, "grits/offline", offline);
 396         viewer->offline = offline;
 397         _grits_viewer_emit_offline(viewer);
 398 }
 399
 400 /**
 401  * grits_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 grits_viewer_get_offline(GritsViewer *viewer)
 409 {
 410         g_assert(GRITS_IS_VIEWER(viewer));
 411         g_debug("GritsViewer: get_offline - %d", viewer->offline);
 412         return viewer->offline;
 413 }
 414
 415 /***********************************
 416  * To be implemented by subclasses *
 417  ***********************************/
 418 /**
 419  * grits_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 grits_viewer_center_position(GritsViewer *viewer,
 429                 gdouble lat, gdouble lon, gdouble elev)
 430 {
 431         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 432         if (!klass->center_position)
 433                 g_warning("GritsViewer: center_position - Unimplemented");
 434         klass->center_position(viewer, lat, lon, elev);
 435 }
 436
 437 /**
 438  * grits_viewer_project:
 439  * @viewer: the viewer
 440  * @lat:  the latitude
 441  * @lon:  the longitude
 442  * @elev: the elevation
 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. #GritsMarker.
 450  */
 451 void grits_viewer_project(GritsViewer *viewer,
 452                 gdouble lat, gdouble lon, gdouble elev,
 453                 gdouble *px, gdouble *py, gdouble *pz)
 454 {
 455         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 456         if (!klass->project)
 457                 g_warning("GritsViewer: project - Unimplemented");
 458         klass->project(viewer, lat, lon, elev, px, py, pz);
 459 }
 460
 461 /**
 462  * grits_viewer_unproject:
 463  * @viewer: the viewer
 464  * @x:    x coordinate in screen space
 465  * @y:    y coordinate in screen space
 466  * @z:    z coordinate in screen space, or -1 to use the value
 467  *        from the depth buffer at x and y as the z value
 468  * @lat:  the latitude
 469  * @lon:  the longitude
 470  * @elev: the elevation
 471  *
 472  * Project a x, y point in screen space to a latitude, longitude, and elevation
 473  * point. Useful for finding the position of the cursor or another on-screen
 474  * object in world coordinates.
 475  */
 476 void grits_viewer_unproject(GritsViewer *viewer,
 477                 gdouble px, gdouble py, gdouble pz,
 478                 gdouble *lat, gdouble *lon, gdouble *elev)
 479 {
 480         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 481         if (!klass->unproject)
 482                 g_warning("GritsViewer: unproject - Unimplemented");
 483         klass->unproject(viewer, px, py, pz, lat, lon, elev);
 484 }
 485
 486 /**
 487  * grits_viewer_clear_height_func:
 488  * @viewer: the viewer
 489  *
 490  * Clears the height function for the entire viewer. Useful when an elevation
 491  * plugin is unloaded.
 492  */
 493 void grits_viewer_clear_height_func(GritsViewer *viewer)
 494 {
 495         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 496         if (!klass->clear_height_func)
 497                 g_warning("GritsViewer: clear_height_func - Unimplemented");
 498         klass->clear_height_func(viewer);
 499 }
 500
 501 /**
 502  * grits_viewer_set_height_func:
 503  * @viewer:      the viewer
 504  * @bounds:      the area to set the height function for
 505  * @height_func: the height function
 506  * @user_data:   user data to pass to the height function
 507  * @update:      %TRUE if the heights inside the bounds should be updated.
 508  *
 509  * Set the height function to be used for a given part of the surface..
 510  */
 511 void grits_viewer_set_height_func(GritsViewer *viewer, GritsBounds *bounds,
 512                 GritsHeightFunc height_func, gpointer user_data,
 513                 gboolean update)
 514 {
 515         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 516         if (!klass->set_height_func)
 517                 g_warning("GritsViewer: set_height_func - Unimplemented");
 518         klass->set_height_func(viewer, bounds, height_func, user_data, update);
 519 }
 520
 521 /**
 522  * grits_viewer_add:
 523  * @viewer: the viewer
 524  * @object: the object to add
 525  * @level:  the level to add the object to
 526  * @sort:   %TRUE if the object should be depth-sorted prior to being drawn
 527  *
 528  * Objects which are added to the viewer will be drawn on subsequent renderings
 529  * if their level of details is adequate.
 530  *
 531  * The @level represents the order the object should be drawn in, this is
 532  * unrelated to the objects actual position in the world.
 533  *
 534  * Semi-transparent objects should set @sort to %TRUE so that they are rendered
 535  * correctly when they overlap other semi-transparent objects.
 536  *
 537  * The viewer steals the objects reference. Call g_object_ref if you plan on
 538  * holding a reference as well.
 539  *
 540  * Returns: a handle to be pass to grits_viewer_remove()
 541  */
 542 gpointer grits_viewer_add(GritsViewer *viewer, GritsObject *object,
 543                 gint level, gboolean sort)
 544 {
 545         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 546         if (!klass->add)
 547                 g_warning("GritsViewer: add - Unimplemented");
 548         object->ref    = klass->add(viewer, object, level, sort);
 549         object->viewer = viewer;
 550         return object;
 551 }
 552
 553 /**
 554  * grits_viewer_remove:
 555  * @viewer: the viewer
 556  * @ref:    the handle obtained from grits_viewer_add()
 557  *
 558  * Remove an object from the viewer. The objects reference count is decremented
 559  * prior to being removed.
 560  *
 561  * Returns: the #GritsObject referenced by the handle
 562  */
 563 GritsObject *grits_viewer_remove(GritsViewer *viewer, GritsObject *object)
 564 {
 565         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 566         if (!klass->remove)
 567                 g_warning("GritsViewer: remove - Unimplemented");
 568         klass->remove(viewer, object);
 569         return object;
 570 }
 571
 572 /****************
 573  * GObject code *
 574  ****************/
 575 G_DEFINE_ABSTRACT_TYPE(GritsViewer, grits_viewer, GTK_TYPE_DRAWING_AREA);
 576 static void grits_viewer_init(GritsViewer *viewer)
 577 {
 578         g_debug("GritsViewer: init");
 579         /* Default values */
 580         viewer->time        = time(NULL);
 581         viewer->location[0] = 40;
 582         viewer->location[1] = -100;
 583         viewer->location[2] = EARTH_R;
 584         viewer->rotation[0] = 0;
 585         viewer->rotation[1] = 0;
 586         viewer->rotation[2] = 0;
 587
 588         g_object_set(viewer, "can-focus", TRUE, NULL);
 589         gtk_widget_add_events(GTK_WIDGET(viewer),
 590                         GDK_BUTTON_PRESS_MASK |
 591                         GDK_BUTTON_RELEASE_MASK |
 592                         GDK_POINTER_MOTION_MASK |
 593                         GDK_KEY_PRESS_MASK);
 594
 595         g_signal_connect(viewer, "key-press-event",      G_CALLBACK(on_key_press),      NULL);
 596         g_signal_connect(viewer, "scroll-event",         G_CALLBACK(on_scroll),         NULL);
 597
 598         g_signal_connect(viewer, "button-press-event",   G_CALLBACK(on_button_press),   NULL);
 599         g_signal_connect(viewer, "button-release-event", G_CALLBACK(on_button_release), NULL);
 600         g_signal_connect(viewer, "motion-notify-event",  G_CALLBACK(on_motion_notify),  NULL);
 601
 602         g_signal_connect(viewer, "location-changed",     G_CALLBACK(on_view_changed),   NULL);
 603         g_signal_connect(viewer, "rotation-changed",     G_CALLBACK(on_view_changed),   NULL);
 604 }
 605 static void grits_viewer_finalize(GObject *gobject)
 606 {
 607         g_debug("GritsViewer: finalize");
 608         G_OBJECT_CLASS(grits_viewer_parent_class)->finalize(gobject);
 609         g_debug("GritsViewer: finalize - done");
 610 }
 611 static void grits_viewer_class_init(GritsViewerClass *klass)
 612 {
 613         g_debug("GritsViewer: class_init");
 614         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 615         gobject_class->finalize     = grits_viewer_finalize;
 616
 617         /**
 618          * GritsViewer::time-changed:
 619          * @viewer: the viewer.
 620          * @time:   the new time.
 621          *
 622          * The ::time-changed signal is emitted when the viewers current time
 623          * changers.
 624          */
 625         signals[SIG_TIME_CHANGED] = g_signal_new(
 626                         "time-changed",
 627                         G_TYPE_FROM_CLASS(gobject_class),
 628                         G_SIGNAL_RUN_LAST,
 629                         0,
 630                         NULL,
 631                         NULL,
 632                         g_cclosure_marshal_VOID__LONG,
 633                         G_TYPE_NONE,
 634                         1,
 635                         G_TYPE_LONG);
 636
 637         /**
 638          * GritsViewer::location-changed:
 639          * @viewer: the viewer.
 640          * @lat:    the new latitude.
 641          * @lon:    the new longitude.
 642          * @elev:   the new elevation.
 643          *
 644          * The ::location-changed signal is emitted when the viewers camera
 645          * location changes.
 646          */
 647         signals[SIG_LOCATION_CHANGED] = g_signal_new(
 648                         "location-changed",
 649                         G_TYPE_FROM_CLASS(gobject_class),
 650                         G_SIGNAL_RUN_LAST,
 651                         0,
 652                         NULL,
 653                         NULL,
 654                         grits_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 655                         G_TYPE_NONE,
 656                         3,
 657                         G_TYPE_DOUBLE,
 658                         G_TYPE_DOUBLE,
 659                         G_TYPE_DOUBLE);
 660
 661         /**
 662          * GritsViewer::rotation-changed:
 663          * @viewer: the viewer.
 664          * @x: rotation new around the x axes.
 665          * @y: rotation new around the y axes.
 666          * @z: rotation new around the z axes.
 667          *
 668          * The ::rotation-changed signal is emitted when the viewers cameras
 669          * rotation changes.
 670          */
 671         signals[SIG_ROTATION_CHANGED] = g_signal_new(
 672                         "rotation-changed",
 673                         G_TYPE_FROM_CLASS(gobject_class),
 674                         G_SIGNAL_RUN_LAST,
 675                         0,
 676                         NULL,
 677                         NULL,
 678                         grits_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 679                         G_TYPE_NONE,
 680                         3,
 681                         G_TYPE_DOUBLE,
 682                         G_TYPE_DOUBLE,
 683                         G_TYPE_DOUBLE);
 684
 685         /**
 686          * GritsViewer::refresh:
 687          * @viewer: the viewer.
 688          *
 689          * The ::refresh signal is emitted when a refresh is needed. If you are
 690          * using real-time data from a remote server, you should connect to the
 691          * refresh signal and update the data when necessary.
 692          */
 693         signals[SIG_REFRESH] = g_signal_new(
 694                         "refresh",
 695                         G_TYPE_FROM_CLASS(gobject_class),
 696                         G_SIGNAL_RUN_LAST,
 697                         0,
 698                         NULL,
 699                         NULL,
 700                         g_cclosure_marshal_VOID__VOID,
 701                         G_TYPE_NONE,
 702                         0);
 703
 704         /**
 705          * GritsViewer::offline:
 706          * @viewer:  the viewer.
 707          * @offline: %TRUE if the viewer going offline.
 708          *
 709          * The ::offline signal is emitted when the viewers offline mode
 710          * changes.
 711          */
 712         signals[SIG_OFFLINE] = g_signal_new(
 713                         "offline",
 714                         G_TYPE_FROM_CLASS(gobject_class),
 715                         G_SIGNAL_RUN_LAST,
 716                         0,
 717                         NULL,
 718                         NULL,
 719                         g_cclosure_marshal_VOID__BOOLEAN,
 720                         G_TYPE_NONE,
 721                         1,
 722                         G_TYPE_BOOLEAN);
 723 }