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 static void _grits_viewer_fix_rotation(GritsViewer *viewer)
  65 {
  66         while (viewer->rotation[0] < -180) viewer->rotation[0] += 360;
  67         while (viewer->rotation[0] >  180) viewer->rotation[0] -= 360;
  68         while (viewer->rotation[1] < -180) viewer->rotation[1] += 360;
  69         while (viewer->rotation[1] >  180) viewer->rotation[1] -= 360;
  70         while (viewer->rotation[2] < -180) viewer->rotation[2] += 360;
  71         while (viewer->rotation[2] >  180) viewer->rotation[2] -= 360;
  72 }
  73
  74 static gboolean _grits_viewer_queue_draw_cb(gpointer _viewer)
  75 {
  76         GritsViewer *viewer = _viewer;
  77         gtk_widget_queue_draw(GTK_WIDGET(viewer));
  78         viewer->draw_source = 0;
  79         return FALSE;
  80 }
  81
  82 /* Signal helpers */
  83 static void _grits_viewer_emit_location_changed(GritsViewer *viewer)
  84 {
  85         g_signal_emit(viewer, signals[SIG_LOCATION_CHANGED], 0,
  86                         viewer->location[0],
  87                         viewer->location[1],
  88                         viewer->location[2]);
  89 }
  90 static void _grits_viewer_emit_rotation_changed(GritsViewer *viewer)
  91 {
  92         g_signal_emit(viewer, signals[SIG_ROTATION_CHANGED], 0,
  93                         viewer->rotation[0],
  94                         viewer->rotation[1],
  95                         viewer->rotation[2]);
  96 }
  97 static void _grits_viewer_emit_time_changed(GritsViewer *viewer)
  98 {
  99         g_signal_emit(viewer, signals[SIG_TIME_CHANGED], 0,
 100                         viewer->time);
 101 }
 102 static void _grits_viewer_emit_refresh(GritsViewer *viewer)
 103 {
 104         g_signal_emit(viewer, signals[SIG_REFRESH], 0);
 105 }
 106 static void _grits_viewer_emit_offline(GritsViewer *viewer)
 107 {
 108         g_signal_emit(viewer, signals[SIG_OFFLINE], 0,
 109                         viewer->offline);
 110 }
 111
 112 /*************
 113  * Callbacks *
 114  *************/
 115 static gboolean on_key_press(GritsViewer *viewer, GdkEventKey *event, gpointer _)
 116 {
 117         g_debug("GritsViewer: on_key_press - key=%x, state=%x, plus=%x",
 118                         event->keyval, event->state, GDK_plus);
 119
 120         double lat, lon, elev, pan;
 121         grits_viewer_get_location(viewer, &lat, &lon, &elev);
 122         pan = MIN(elev/(EARTH_R/2), 30);
 123         switch (event->keyval) {
 124         case GDK_Left:  case GDK_h: grits_viewer_pan(viewer,  0,  -pan, 0); break;
 125         case GDK_Down:  case GDK_j: grits_viewer_pan(viewer, -pan, 0,   0); break;
 126         case GDK_Up:    case GDK_k: grits_viewer_pan(viewer,  pan, 0,   0); break;
 127         case GDK_Right: case GDK_l: grits_viewer_pan(viewer,  0,   pan, 0); break;
 128         case GDK_minus: case GDK_o: grits_viewer_zoom(viewer, 10./9); break;
 129         case GDK_plus:  case GDK_i: grits_viewer_zoom(viewer, 9./10); break;
 130         case GDK_H: grits_viewer_rotate(viewer,  0, 0, -2); break;
 131         case GDK_J: grits_viewer_rotate(viewer,  2, 0,  0); break;
 132         case GDK_K: grits_viewer_rotate(viewer, -2, 0,  0); break;
 133         case GDK_L: grits_viewer_rotate(viewer,  0, 0,  2); break;
 134         }
 135         return FALSE;
 136 }
 137
 138 static gboolean on_scroll(GritsViewer *viewer, GdkEventScroll *event, gpointer _)
 139 {
 140         switch (event->direction) {
 141         case GDK_SCROLL_DOWN: grits_viewer_zoom(viewer, 10./9); break;
 142         case GDK_SCROLL_UP:   grits_viewer_zoom(viewer, 9./10); break;
 143         default: break;
 144         }
 145         return FALSE;
 146 }
 147
 148 enum {
 149         GRITS_DRAG_NONE,
 150         GRITS_DRAG_PAN,
 151         GRITS_DRAG_ZOOM,
 152         GRITS_DRAG_TILT,
 153 };
 154
 155 static gboolean on_button_press(GritsViewer *viewer, GdkEventButton *event, gpointer _)
 156 {
 157         g_debug("GritsViewer: on_button_press - %d", event->button);
 158         gtk_widget_grab_focus(GTK_WIDGET(viewer));
 159         switch (event->button) {
 160         case 1:  viewer->drag_mode = GRITS_DRAG_PAN;  break;
 161         case 2:  viewer->drag_mode = GRITS_DRAG_ZOOM; break;
 162         case 3:  viewer->drag_mode = GRITS_DRAG_TILT; break;
 163         default: viewer->drag_mode = GRITS_DRAG_NONE; break;
 164         }
 165         viewer->drag_x = event->x;
 166         viewer->drag_y = event->y;
 167         return FALSE;
 168 }
 169
 170 static gboolean on_button_release(GritsViewer *viewer, GdkEventButton *event, gpointer _)
 171 {
 172         g_debug("GritsViewer: on_button_release");
 173         viewer->drag_mode = GRITS_DRAG_NONE;
 174         return FALSE;
 175 }
 176
 177 static gboolean on_motion_notify(GritsViewer *viewer, GdkEventMotion *event, gpointer _)
 178 {
 179         gdouble x = viewer->drag_x - event->x;
 180         gdouble y = viewer->drag_y - event->y;
 181         gdouble lat, lon, elev, scale, rx, ry, rz;
 182         grits_viewer_get_location(GRITS_VIEWER(viewer), &lat, &lon, &elev);
 183         grits_viewer_get_rotation(GRITS_VIEWER(viewer), &rx,  &ry,  &rz);
 184         scale = (elev/EARTH_R/14.1) * (sin(deg2rad(ABS(rx)))*4+1);
 185         switch (viewer->drag_mode) {
 186         case GRITS_DRAG_PAN:  grits_viewer_pan(viewer, -y*scale*0.782, x*scale, 0); break;
 187         case GRITS_DRAG_ZOOM: grits_viewer_zoom(viewer, pow(2, -y/500)); break;
 188         case GRITS_DRAG_TILT: grits_viewer_rotate(viewer, y/10, 0, x/10); break;
 189         }
 190         viewer->drag_x = event->x;
 191         viewer->drag_y = event->y;
 192         return FALSE;
 193 }
 194
 195 static void on_view_changed(GritsViewer *viewer,
 196                 gdouble _1, gdouble _2, gdouble _3)
 197 {
 198         grits_viewer_queue_draw(viewer);
 199 }
 200
 201 /***********
 202  * Methods *
 203  ***********/
 204 /**
 205  * grits_viewer_setup:
 206  * @viewer:  the viewer
 207  * @plugins: a plugins store
 208  * @prefs:   a prefs store
 209  *
 210  * This should be called by objects which implement GritsViewer somewhere in their
 211  * constructor.
 212  */
 213 void grits_viewer_setup(GritsViewer *viewer, GritsPlugins *plugins, GritsPrefs *prefs)
 214 {
 215         viewer->plugins = plugins;
 216         viewer->prefs   = prefs;
 217         viewer->offline = grits_prefs_get_boolean(prefs, "grits/offline", NULL);
 218 }
 219
 220 /**
 221  * grits_viewer_set_time:
 222  * @viewer: the viewer
 223  * @time: the time to set the view to
 224  *
 225  * Set the current time for the view
 226  */
 227 void grits_viewer_set_time(GritsViewer *viewer, time_t time)
 228 {
 229         g_assert(GRITS_IS_VIEWER(viewer));
 230         g_debug("GritsViewer: set_time - time=%ld", time);
 231         viewer->time = time;
 232         _grits_viewer_emit_time_changed(viewer);
 233 }
 234
 235 /**
 236  * grits_viewer_get_time:
 237  * @viewer: the viewer
 238  *
 239  * Get the time that is being viewed
 240  *
 241  * Returns: the current time
 242  */
 243 time_t grits_viewer_get_time(GritsViewer *viewer)
 244 {
 245         g_assert(GRITS_IS_VIEWER(viewer));
 246         g_debug("GritsViewer: get_time");
 247         return viewer->time;
 248 }
 249
 250 /**
 251  * grits_viewer_set_location:
 252  * @viewer: the viewer
 253  * @lat:  the new latitude
 254  * @lon:  the new longitude
 255  * @elev: the new elevation
 256  *
 257  * Set the location for the camera
 258  */
 259 void grits_viewer_set_location(GritsViewer *viewer, gdouble lat, gdouble lon, gdouble elev)
 260 {
 261         g_assert(GRITS_IS_VIEWER(viewer));
 262         g_debug("GritsViewer: set_location");
 263         viewer->location[0] = lat;
 264         viewer->location[1] = lon;
 265         viewer->location[2] = elev;
 266         _grits_viewer_fix_location(viewer);
 267         _grits_viewer_emit_location_changed(viewer);
 268 }
 269
 270 /**
 271  * grits_viewer_get_location:
 272  * @viewer: the viewer
 273  * @lat:  the location to store the latitude
 274  * @lon:  the location to store the longitude
 275  * @elev: the location to store the elevation
 276  *
 277  * Get the location of the camera
 278  */
 279 void grits_viewer_get_location(GritsViewer *viewer, gdouble *lat, gdouble *lon, gdouble *elev)
 280 {
 281         g_assert(GRITS_IS_VIEWER(viewer));
 282         //g_debug("GritsViewer: get_location");
 283         *lat  = viewer->location[0];
 284         *lon  = viewer->location[1];
 285         *elev = viewer->location[2];
 286 }
 287
 288 /**
 289  * grits_viewer_pan:
 290  * @viewer: the viewer
 291  * @forward:  distance to move forward in meters
 292  * @right:    distance to move right in meters
 293  * @up:       distance to move up in meters
 294  *
 295  * Pan the location by a number of meters long the surface.
 296  *
 297  * Bugs: the distances are not in meters
 298  * Bugs: panning does not move in strait lines
 299  */
 300 void grits_viewer_pan(GritsViewer *viewer, gdouble forward, gdouble sideways, gdouble up)
 301 {
 302         g_assert(GRITS_IS_VIEWER(viewer));
 303         g_debug("GritsViewer: pan - forward=%8.3f, sideways=%8.3f, up=%8.3f",
 304                         forward, sideways, up);
 305         gdouble dist   = sqrt(forward*forward + sideways*sideways);
 306         gdouble angle1 = deg2rad(viewer->rotation[2]);
 307         gdouble angle2 = atan2(sideways, forward);
 308         gdouble angle  = angle1 + angle2;
 309         /* This isn't accurate, but it's usable */
 310         viewer->location[0] += dist*cos(angle);
 311         viewer->location[1] += dist*sin(angle);
 312         viewer->location[2] += up;
 313         _grits_viewer_fix_location(viewer);
 314         _grits_viewer_emit_location_changed(viewer);
 315 }
 316
 317 /**
 318  * grits_viewer_zoom:
 319  * @viewer: the viewer
 320  * @scale: the scale to multiple the elevation by
 321  *
 322  * Multiple the elevation by a scale.
 323  */
 324 void grits_viewer_zoom(GritsViewer *viewer, gdouble scale)
 325 {
 326         g_assert(GRITS_IS_VIEWER(viewer));
 327         g_debug("GritsViewer: zoom");
 328         viewer->location[2] *= scale;
 329         _grits_viewer_emit_location_changed(viewer);
 330 }
 331
 332 /**
 333  * grits_viewer_set_rotation:
 334  * @viewer: the viewer
 335  * @x: rotation new around the x axes
 336  * @y: rotation new around the y axes
 337  * @z: rotation new around the z axes
 338  *
 339  * Set the rotations in degrees around the x, y, and z axes.
 340  */
 341 void grits_viewer_set_rotation(GritsViewer *viewer, gdouble x, gdouble y, gdouble z)
 342 {
 343         g_assert(GRITS_IS_VIEWER(viewer));
 344         g_debug("GritsViewer: set_rotation");
 345         viewer->rotation[0] = x;
 346         viewer->rotation[1] = y;
 347         viewer->rotation[2] = z;
 348         _grits_viewer_fix_rotation(viewer);
 349         _grits_viewer_emit_rotation_changed(viewer);
 350 }
 351
 352 /**
 353  * grits_viewer_get_rotation:
 354  * @viewer: the viewer
 355  * @x: rotation around the x axes
 356  * @y: rotation around the y axes
 357  * @z: rotation around the z axes
 358  *
 359  * Get the rotations in degrees around the x, y, and z axes.
 360  */
 361 void grits_viewer_get_rotation(GritsViewer *viewer, gdouble *x, gdouble *y, gdouble *z)
 362 {
 363         g_assert(GRITS_IS_VIEWER(viewer));
 364         //g_debug("GritsViewer: get_rotation");
 365         *x = viewer->rotation[0];
 366         *y = viewer->rotation[1];
 367         *z = viewer->rotation[2];
 368 }
 369
 370 /**
 371  * grits_viewer_rotate:
 372  * @viewer: the viewer
 373  * @x: rotation around the x axes
 374  * @y: rotation around the y axes
 375  * @z: rotation around the z axes
 376  *
 377  * Add to the rotation around the x, y, and z axes.
 378  */
 379 void grits_viewer_rotate(GritsViewer *viewer, gdouble x, gdouble y, gdouble z)
 380 {
 381         g_assert(GRITS_IS_VIEWER(viewer));
 382         g_debug("GritsViewer: rotate - x=%.0f, y=%.0f, z=%.0f", x, y, z);
 383         viewer->rotation[0] += x;
 384         viewer->rotation[1] += y;
 385         viewer->rotation[2] += z;
 386         _grits_viewer_fix_rotation(viewer);
 387         _grits_viewer_emit_rotation_changed(viewer);
 388 }
 389
 390 /**
 391  * grits_viewer_refresh:
 392  * @viewer: the viewer
 393  *
 394  * Trigger the refresh signal. This will cause any remote data to be checked for
 395  * updates.
 396  */
 397 void grits_viewer_refresh(GritsViewer *viewer)
 398 {
 399         g_debug("GritsViewer: refresh");
 400         _grits_viewer_emit_refresh(viewer);
 401 }
 402
 403 /**
 404  * grits_viewer_set_offline:
 405  * @viewer: the viewer
 406  * @offline: %TRUE to enter offline mode
 407  *
 408  * Set the offline mode. If @offline is %TRUE, only locally cached data will be
 409  * used.
 410  */
 411 void grits_viewer_set_offline(GritsViewer *viewer, gboolean offline)
 412 {
 413         g_assert(GRITS_IS_VIEWER(viewer));
 414         g_debug("GritsViewer: set_offline - %d", offline);
 415         grits_prefs_set_boolean(viewer->prefs, "grits/offline", offline);
 416         viewer->offline = offline;
 417         _grits_viewer_emit_offline(viewer);
 418 }
 419
 420 /**
 421  * grits_viewer_get_offline:
 422  * @viewer: the viewer
 423  *
 424  * Check if the viewer is in offline mode.
 425  *
 426  * Returns: %TRUE if the viewer is in offline mode.
 427  */
 428 gboolean grits_viewer_get_offline(GritsViewer *viewer)
 429 {
 430         g_assert(GRITS_IS_VIEWER(viewer));
 431         g_debug("GritsViewer: get_offline - %d", viewer->offline);
 432         return viewer->offline;
 433 }
 434
 435 /**
 436  * grits_viewer_queue_draw:
 437  * @viewer: the viewer
 438  *
 439  * Causes the viewer to redraw the screen. This has the safe effect as
 440  * gtk_widget_queue_draw, but is thread safe, and probably faster.
 441  */
 442 void grits_viewer_queue_draw(GritsViewer *viewer)
 443 {
 444         if (!viewer->draw_source)
 445                 viewer->draw_source = g_idle_add_full(G_PRIORITY_HIGH,
 446                                 _grits_viewer_queue_draw_cb, viewer, NULL);
 447 }
 448
 449 /***********************************
 450  * To be implemented by subclasses *
 451  ***********************************/
 452 /**
 453  * grits_viewer_center_position:
 454  * @viewer: the viewer
 455  * @lat:  the latitude
 456  * @lon:  the longitude
 457  * @elev: the elevation
 458  *
 459  * Center the viewer on a point. This can be used before drawing operations to
 460  * center the items a particular location.
 461  */
 462 void grits_viewer_center_position(GritsViewer *viewer,
 463                 gdouble lat, gdouble lon, gdouble elev)
 464 {
 465         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 466         if (!klass->center_position)
 467                 g_warning("GritsViewer: center_position - Unimplemented");
 468         klass->center_position(viewer, lat, lon, elev);
 469 }
 470
 471 /**
 472  * grits_viewer_project:
 473  * @viewer: the viewer
 474  * @lat:  the latitude
 475  * @lon:  the longitude
 476  * @elev: the elevation
 477  * @px:   the project x coordinate
 478  * @py:   the project y coordinate
 479  * @pz:   the project z coordinate
 480  *
 481  * Project a latitude, longitude, elevation point to to x, y, and z coordinates
 482  * in screen space. Useful for drawing orthographic data over a particular point
 483  * in space. E.g. #GritsMarker.
 484  */
 485 void grits_viewer_project(GritsViewer *viewer,
 486                 gdouble lat, gdouble lon, gdouble elev,
 487                 gdouble *px, gdouble *py, gdouble *pz)
 488 {
 489         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 490         if (!klass->project)
 491                 g_warning("GritsViewer: project - Unimplemented");
 492         klass->project(viewer, lat, lon, elev, px, py, pz);
 493 }
 494
 495 /**
 496  * grits_viewer_unproject:
 497  * @viewer: the viewer
 498  * @x:    x coordinate in screen space
 499  * @y:    y coordinate in screen space
 500  * @z:    z coordinate in screen space, or -1 to use the value
 501  *        from the depth buffer at x and y as the z value
 502  * @lat:  the latitude
 503  * @lon:  the longitude
 504  * @elev: the elevation
 505  *
 506  * Project a x, y point in screen space to a latitude, longitude, and elevation
 507  * point. Useful for finding the position of the cursor or another on-screen
 508  * object in world coordinates.
 509  */
 510 void grits_viewer_unproject(GritsViewer *viewer,
 511                 gdouble px, gdouble py, gdouble pz,
 512                 gdouble *lat, gdouble *lon, gdouble *elev)
 513 {
 514         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 515         if (!klass->unproject)
 516                 g_warning("GritsViewer: unproject - Unimplemented");
 517         klass->unproject(viewer, px, py, pz, lat, lon, elev);
 518 }
 519
 520 /**
 521  * grits_viewer_clear_height_func:
 522  * @viewer: the viewer
 523  *
 524  * Clears the height function for the entire viewer. Useful when an elevation
 525  * plugin is unloaded.
 526  */
 527 void grits_viewer_clear_height_func(GritsViewer *viewer)
 528 {
 529         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 530         if (!klass->clear_height_func)
 531                 g_warning("GritsViewer: clear_height_func - Unimplemented");
 532         klass->clear_height_func(viewer);
 533 }
 534
 535 /**
 536  * grits_viewer_set_height_func:
 537  * @viewer:      the viewer
 538  * @bounds:      the area to set the height function for
 539  * @height_func: the height function
 540  * @user_data:   user data to pass to the height function
 541  * @update:      %TRUE if the heights inside the bounds should be updated.
 542  *
 543  * Set the height function to be used for a given part of the surface..
 544  */
 545 void grits_viewer_set_height_func(GritsViewer *viewer, GritsBounds *bounds,
 546                 GritsHeightFunc height_func, gpointer user_data,
 547                 gboolean update)
 548 {
 549         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 550         if (!klass->set_height_func)
 551                 g_warning("GritsViewer: set_height_func - Unimplemented");
 552         klass->set_height_func(viewer, bounds, height_func, user_data, update);
 553 }
 554
 555 /**
 556  * grits_viewer_add:
 557  * @viewer: the viewer
 558  * @object: the object to add
 559  * @level:  the level to add the object to
 560  * @sort:   %TRUE if the object should be depth-sorted prior to being drawn
 561  *
 562  * Objects which are added to the viewer will be drawn on subsequent renderings
 563  * if their level of details is adequate.
 564  *
 565  * The @level represents the order the object should be drawn in, this is
 566  * unrelated to the objects actual position in the world.
 567  *
 568  * Semi-transparent objects should set @sort to %TRUE so that they are rendered
 569  * correctly when they overlap other semi-transparent objects.
 570  *
 571  * The viewer steals the objects reference. Call g_object_ref if you plan on
 572  * holding a reference as well.
 573  */
 574 void grits_viewer_add(GritsViewer *viewer, GritsObject *object,
 575                 gint level, gboolean sort)
 576 {
 577         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 578         if (!klass->add)
 579                 g_warning("GritsViewer: add - Unimplemented");
 580         object->viewer = viewer;
 581         klass->add(viewer, object, level, sort);
 582 }
 583
 584 /**
 585  * grits_viewer_remove:
 586  * @viewer: the viewer
 587  * @object: the object to remove
 588  *
 589  * Remove an object from the viewer.
 590  */
 591 void grits_viewer_remove(GritsViewer *viewer, GritsObject *object)
 592 {
 593         GritsViewerClass *klass = GRITS_VIEWER_GET_CLASS(viewer);
 594         if (!object->viewer)
 595                 return;
 596         if (!klass->remove)
 597                 g_warning("GritsViewer: remove - Unimplemented");
 598         object->viewer = NULL;
 599         klass->remove(viewer, object);
 600 }
 601
 602 /****************
 603  * GObject code *
 604  ****************/
 605 G_DEFINE_ABSTRACT_TYPE(GritsViewer, grits_viewer, GTK_TYPE_DRAWING_AREA);
 606 static void grits_viewer_init(GritsViewer *viewer)
 607 {
 608         g_debug("GritsViewer: init");
 609         /* Default values */
 610         viewer->time        = time(NULL);
 611         viewer->location[0] = 40;
 612         viewer->location[1] = -100;
 613         viewer->location[2] = EARTH_R;
 614         viewer->rotation[0] = 0;
 615         viewer->rotation[1] = 0;
 616         viewer->rotation[2] = 0;
 617
 618         g_object_set(viewer, "can-focus", TRUE, NULL);
 619         gtk_widget_add_events(GTK_WIDGET(viewer),
 620                         GDK_BUTTON_PRESS_MASK |
 621                         GDK_BUTTON_RELEASE_MASK |
 622                         GDK_POINTER_MOTION_MASK |
 623                         GDK_KEY_PRESS_MASK);
 624
 625         g_signal_connect(viewer, "key-press-event",      G_CALLBACK(on_key_press),      NULL);
 626         g_signal_connect(viewer, "scroll-event",         G_CALLBACK(on_scroll),         NULL);
 627
 628         g_signal_connect(viewer, "button-press-event",   G_CALLBACK(on_button_press),   NULL);
 629         g_signal_connect(viewer, "button-release-event", G_CALLBACK(on_button_release), NULL);
 630         g_signal_connect(viewer, "motion-notify-event",  G_CALLBACK(on_motion_notify),  NULL);
 631
 632         g_signal_connect(viewer, "location-changed",     G_CALLBACK(on_view_changed),   NULL);
 633         g_signal_connect(viewer, "rotation-changed",     G_CALLBACK(on_view_changed),   NULL);
 634 }
 635 static void grits_viewer_dispose(GObject *gobject)
 636 {
 637         g_debug("GritsViewer: dispose");
 638         GritsViewer *viewer = GRITS_VIEWER(gobject);
 639         if (viewer->draw_source)
 640                 g_source_remove(viewer->draw_source);
 641         G_OBJECT_CLASS(grits_viewer_parent_class)->dispose(gobject);
 642 }
 643 static void grits_viewer_finalize(GObject *gobject)
 644 {
 645         g_debug("GritsViewer: finalize");
 646         G_OBJECT_CLASS(grits_viewer_parent_class)->finalize(gobject);
 647         g_debug("GritsViewer: finalize - done");
 648 }
 649 static void grits_viewer_class_init(GritsViewerClass *klass)
 650 {
 651         g_debug("GritsViewer: class_init");
 652         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 653         gobject_class->dispose      = grits_viewer_dispose;
 654         gobject_class->finalize     = grits_viewer_finalize;
 655
 656         /**
 657          * GritsViewer::time-changed:
 658          * @viewer: the viewer.
 659          * @time:   the new time.
 660          *
 661          * The ::time-changed signal is emitted when the viewers current time
 662          * changers.
 663          */
 664         signals[SIG_TIME_CHANGED] = g_signal_new(
 665                         "time-changed",
 666                         G_TYPE_FROM_CLASS(gobject_class),
 667                         G_SIGNAL_RUN_LAST,
 668                         0,
 669                         NULL,
 670                         NULL,
 671                         g_cclosure_marshal_VOID__LONG,
 672                         G_TYPE_NONE,
 673                         1,
 674                         G_TYPE_LONG);
 675
 676         /**
 677          * GritsViewer::location-changed:
 678          * @viewer: the viewer.
 679          * @lat:    the new latitude.
 680          * @lon:    the new longitude.
 681          * @elev:   the new elevation.
 682          *
 683          * The ::location-changed signal is emitted when the viewers camera
 684          * location changes.
 685          */
 686         signals[SIG_LOCATION_CHANGED] = g_signal_new(
 687                         "location-changed",
 688                         G_TYPE_FROM_CLASS(gobject_class),
 689                         G_SIGNAL_RUN_LAST,
 690                         0,
 691                         NULL,
 692                         NULL,
 693                         grits_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 694                         G_TYPE_NONE,
 695                         3,
 696                         G_TYPE_DOUBLE,
 697                         G_TYPE_DOUBLE,
 698                         G_TYPE_DOUBLE);
 699
 700         /**
 701          * GritsViewer::rotation-changed:
 702          * @viewer: the viewer.
 703          * @x: rotation new around the x axes.
 704          * @y: rotation new around the y axes.
 705          * @z: rotation new around the z axes.
 706          *
 707          * The ::rotation-changed signal is emitted when the viewers cameras
 708          * rotation changes.
 709          */
 710         signals[SIG_ROTATION_CHANGED] = g_signal_new(
 711                         "rotation-changed",
 712                         G_TYPE_FROM_CLASS(gobject_class),
 713                         G_SIGNAL_RUN_LAST,
 714                         0,
 715                         NULL,
 716                         NULL,
 717                         grits_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 718                         G_TYPE_NONE,
 719                         3,
 720                         G_TYPE_DOUBLE,
 721                         G_TYPE_DOUBLE,
 722                         G_TYPE_DOUBLE);
 723
 724         /**
 725          * GritsViewer::refresh:
 726          * @viewer: the viewer.
 727          *
 728          * The ::refresh signal is emitted when a refresh is needed. If you are
 729          * using real-time data from a remote server, you should connect to the
 730          * refresh signal and update the data when necessary.
 731          */
 732         signals[SIG_REFRESH] = g_signal_new(
 733                         "refresh",
 734                         G_TYPE_FROM_CLASS(gobject_class),
 735                         G_SIGNAL_RUN_LAST,
 736                         0,
 737                         NULL,
 738                         NULL,
 739                         g_cclosure_marshal_VOID__VOID,
 740                         G_TYPE_NONE,
 741                         0);
 742
 743         /**
 744          * GritsViewer::offline:
 745          * @viewer:  the viewer.
 746          * @offline: %TRUE if the viewer going offline.
 747          *
 748          * The ::offline signal is emitted when the viewers offline mode
 749          * changes.
 750          */
 751         signals[SIG_OFFLINE] = g_signal_new(
 752                         "offline",
 753                         G_TYPE_FROM_CLASS(gobject_class),
 754                         G_SIGNAL_RUN_LAST,
 755                         0,
 756                         NULL,
 757                         NULL,
 758                         g_cclosure_marshal_VOID__BOOLEAN,
 759                         G_TYPE_NONE,
 760                         1,
 761                         G_TYPE_BOOLEAN);
 762 }