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 #include <config.h>
  19 #include <math.h>
  20 #include <gtk/gtk.h>
  21 #include <gdk/gdkkeysyms.h>
  22
  23 #include "gis-marshal.h"
  24 #include "gis-viewer.h"
  25
  26 #include "gis-util.h"
  27
  28
  29 /* Constants */
  30 enum {
  31         SIG_TIME_CHANGED,
  32         SIG_LOCATION_CHANGED,
  33         SIG_ROTATION_CHANGED,
  34         SIG_REFRESH,
  35         SIG_OFFLINE,
  36         NUM_SIGNALS,
  37 };
  38 static guint signals[NUM_SIGNALS];
  39
  40
  41 /***********
  42  * Helpers *
  43  ***********/
  44 /* Misc helpers */
  45 static void _gis_viewer_fix_location(GisViewer *viewer)
  46 {
  47         while (viewer->location[0] <  -90) viewer->location[0] += 180;
  48         while (viewer->location[0] >   90) viewer->location[0] -= 180;
  49         while (viewer->location[1] < -180) viewer->location[1] += 360;
  50         while (viewer->location[1] >  180) viewer->location[1] -= 360;
  51         viewer->location[2] = ABS(viewer->location[2]);
  52 }
  53
  54 /* Signal helpers */
  55 static void _gis_viewer_emit_location_changed(GisViewer *viewer)
  56 {
  57         g_signal_emit(viewer, signals[SIG_LOCATION_CHANGED], 0,
  58                         viewer->location[0],
  59                         viewer->location[1],
  60                         viewer->location[2]);
  61 }
  62 static void _gis_viewer_emit_rotation_changed(GisViewer *viewer)
  63 {
  64         g_signal_emit(viewer, signals[SIG_ROTATION_CHANGED], 0,
  65                         viewer->rotation[0],
  66                         viewer->rotation[1],
  67                         viewer->rotation[2]);
  68 }
  69 static void _gis_viewer_emit_time_changed(GisViewer *viewer)
  70 {
  71         g_signal_emit(viewer, signals[SIG_TIME_CHANGED], 0,
  72                         viewer->time);
  73 }
  74 static void _gis_viewer_emit_refresh(GisViewer *viewer)
  75 {
  76         g_signal_emit(viewer, signals[SIG_REFRESH], 0);
  77 }
  78 static void _gis_viewer_emit_offline(GisViewer *viewer)
  79 {
  80         g_signal_emit(viewer, signals[SIG_OFFLINE], 0,
  81                         viewer->offline);
  82 }
  83
  84 /*************
  85  * Callbacks *
  86  *************/
  87 static gboolean on_key_press(GisViewer *viewer, GdkEventKey *event, gpointer _)
  88 {
  89         g_debug("GisViewer: on_key_press - key=%x, state=%x, plus=%x",
  90                         event->keyval, event->state, GDK_plus);
  91
  92         double lat, lon, elev, pan;
  93         gis_viewer_get_location(viewer, &lat, &lon, &elev);
  94         pan = MIN(elev/(EARTH_R/2), 30);
  95         guint kv = event->keyval;
  96         gdk_threads_leave();
  97         if      (kv == GDK_Left  || kv == GDK_h) gis_viewer_pan(viewer,  0,  -pan, 0);
  98         else if (kv == GDK_Down  || kv == GDK_j) gis_viewer_pan(viewer, -pan, 0,   0);
  99         else if (kv == GDK_Up    || kv == GDK_k) gis_viewer_pan(viewer,  pan, 0,   0);
 100         else if (kv == GDK_Right || kv == GDK_l) gis_viewer_pan(viewer,  0,   pan, 0);
 101         else if (kv == GDK_minus || kv == GDK_o) gis_viewer_zoom(viewer, 10./9);
 102         else if (kv == GDK_plus  || kv == GDK_i) gis_viewer_zoom(viewer, 9./10);
 103         else if (kv == GDK_H) gis_viewer_rotate(viewer,  0, 0, -2);
 104         else if (kv == GDK_J) gis_viewer_rotate(viewer,  2, 0,  0);
 105         else if (kv == GDK_K) gis_viewer_rotate(viewer, -2, 0,  0);
 106         else if (kv == GDK_L) gis_viewer_rotate(viewer,  0, 0,  2);
 107         return FALSE;
 108 }
 109
 110 enum {
 111         GIS_DRAG_NONE,
 112         GIS_DRAG_PAN,
 113         GIS_DRAG_ZOOM,
 114         GIS_DRAG_TILT,
 115 };
 116
 117 static gboolean on_button_press(GisViewer *viewer, GdkEventButton *event, gpointer _)
 118 {
 119         g_debug("GisViewer: on_button_press - %d", event->button);
 120         gtk_widget_grab_focus(GTK_WIDGET(viewer));
 121         switch (event->button) {
 122         case 1:  viewer->drag_mode = GIS_DRAG_PAN;  break;
 123         case 2:  viewer->drag_mode = GIS_DRAG_ZOOM; break;
 124         case 3:  viewer->drag_mode = GIS_DRAG_TILT; break;
 125         defualt: viewer->drag_mode = GIS_DRAG_NONE; break;
 126         }
 127         viewer->drag_x = event->x;
 128         viewer->drag_y = event->y;
 129         return FALSE;
 130 }
 131
 132 static gboolean on_button_release(GisViewer *viewer, GdkEventButton *event, gpointer _)
 133 {
 134         g_debug("GisViewer: on_button_release");
 135         viewer->drag_mode = GIS_DRAG_NONE;
 136         return FALSE;
 137 }
 138
 139 static gboolean on_motion_notify(GisViewer *viewer, GdkEventMotion *event, gpointer _)
 140 {
 141         gdouble x_dist = viewer->drag_x - event->x;
 142         gdouble y_dist = viewer->drag_y - event->y;
 143         gdouble lat, lon, elev, scale;
 144         gis_viewer_get_location(GIS_VIEWER(viewer), &lat, &lon, &elev);
 145         scale = elev/EARTH_R/15;
 146         switch (viewer->drag_mode) {
 147         case GIS_DRAG_PAN:
 148                 gis_viewer_pan(viewer, -y_dist*scale, x_dist*scale, 0);
 149                 break;
 150         case GIS_DRAG_ZOOM:
 151                 gis_viewer_zoom(viewer, pow(2, -y_dist/500));
 152                 break;
 153         case GIS_DRAG_TILT:
 154                 gis_viewer_rotate(viewer, y_dist/10, 0, x_dist/10);
 155                 break;
 156         }
 157         viewer->drag_x = event->x;
 158         viewer->drag_y = event->y;
 159         return FALSE;
 160 }
 161
 162 static void on_view_changed(GisViewer *viewer,
 163                 gdouble _1, gdouble _2, gdouble _3)
 164 {
 165         gtk_widget_queue_draw(GTK_WIDGET(viewer));
 166 }
 167
 168 /***********
 169  * Methods *
 170  ***********/
 171 void gis_viewer_setup(GisViewer *viewer, GisPlugins *plugins, GisPrefs *prefs)
 172 {
 173         viewer->plugins = plugins;
 174         viewer->prefs   = prefs;
 175         viewer->offline = gis_prefs_get_boolean(prefs, "gis/offline", NULL);
 176 }
 177
 178 void gis_viewer_set_time(GisViewer *viewer, const char *time)
 179 {
 180         g_assert(GIS_IS_VIEWER(viewer));
 181         g_debug("GisViewer: set_time - time=%s", time);
 182         g_free(viewer->time);
 183         viewer->time = g_strdup(time);
 184         _gis_viewer_emit_time_changed(viewer);
 185 }
 186
 187 gchar *gis_viewer_get_time(GisViewer *viewer)
 188 {
 189         g_assert(GIS_IS_VIEWER(viewer));
 190         g_debug("GisViewer: get_time");
 191         return viewer->time;
 192 }
 193
 194 void gis_viewer_set_location(GisViewer *viewer, gdouble lat, gdouble lon, gdouble elev)
 195 {
 196         g_assert(GIS_IS_VIEWER(viewer));
 197         g_debug("GisViewer: set_location");
 198         viewer->location[0] = lat;
 199         viewer->location[1] = lon;
 200         viewer->location[2] = elev;
 201         _gis_viewer_fix_location(viewer);
 202         _gis_viewer_emit_location_changed(viewer);
 203 }
 204
 205 void gis_viewer_get_location(GisViewer *viewer, gdouble *lat, gdouble *lon, gdouble *elev)
 206 {
 207         g_assert(GIS_IS_VIEWER(viewer));
 208         //g_debug("GisViewer: get_location");
 209         *lat  = viewer->location[0];
 210         *lon  = viewer->location[1];
 211         *elev = viewer->location[2];
 212 }
 213
 214 void gis_viewer_pan(GisViewer *viewer, gdouble forward, gdouble sideways, gdouble up)
 215 {
 216         g_assert(GIS_IS_VIEWER(viewer));
 217         g_debug("GisViewer: pan - forward=%8.3f, sideways=%8.3f, up=%8.3f",
 218                         forward, sideways, up);
 219         gdouble dist   = sqrt(forward*forward + sideways*sideways);
 220         gdouble angle1 = deg2rad(viewer->rotation[2]);
 221         gdouble angle2 = atan2(sideways, forward);
 222         gdouble angle  = angle1 + angle2;
 223         g_message("pan: dist=%f, angle=%f+%f=%f move=%f,%f",
 224                         dist, angle1, angle2, angle,
 225                         dist*cos(angle),
 226                         dist*sin(angle));
 227         /* This isn't accurate, but it's usable */
 228         viewer->location[0] += dist*cos(angle);
 229         viewer->location[1] += dist*sin(angle);
 230         viewer->location[2] += up;
 231         _gis_viewer_fix_location(viewer);
 232         _gis_viewer_emit_location_changed(viewer);
 233 }
 234
 235 void gis_viewer_zoom(GisViewer *viewer, gdouble scale)
 236 {
 237         g_assert(GIS_IS_VIEWER(viewer));
 238         g_debug("GisViewer: zoom");
 239         viewer->location[2] *= scale;
 240         _gis_viewer_emit_location_changed(viewer);
 241 }
 242
 243 void gis_viewer_set_rotation(GisViewer *viewer, gdouble x, gdouble y, gdouble z)
 244 {
 245         g_assert(GIS_IS_VIEWER(viewer));
 246         g_debug("GisViewer: set_rotation");
 247         viewer->rotation[0] = x;
 248         viewer->rotation[1] = y;
 249         viewer->rotation[2] = z;
 250         _gis_viewer_emit_rotation_changed(viewer);
 251 }
 252
 253 void gis_viewer_get_rotation(GisViewer *viewer, gdouble *x, gdouble *y, gdouble *z)
 254 {
 255         g_assert(GIS_IS_VIEWER(viewer));
 256         g_debug("GisViewer: get_rotation");
 257         *x = viewer->rotation[0];
 258         *y = viewer->rotation[1];
 259         *z = viewer->rotation[2];
 260 }
 261
 262 void gis_viewer_rotate(GisViewer *viewer, gdouble x, gdouble y, gdouble z)
 263 {
 264         g_assert(GIS_IS_VIEWER(viewer));
 265         g_debug("GisViewer: rotate - x=%.0f, y=%.0f, z=%.0f", x, y, z);
 266         viewer->rotation[0] += x;
 267         viewer->rotation[1] += y;
 268         viewer->rotation[2] += z;
 269         _gis_viewer_emit_rotation_changed(viewer);
 270 }
 271
 272 void gis_viewer_refresh(GisViewer *viewer)
 273 {
 274         g_debug("GisViewer: refresh");
 275         _gis_viewer_emit_refresh(viewer);
 276 }
 277
 278 void gis_viewer_set_offline(GisViewer *viewer, gboolean offline)
 279 {
 280         g_assert(GIS_IS_VIEWER(viewer));
 281         g_debug("GisViewer: set_offline - %d", offline);
 282         gis_prefs_set_boolean(viewer->prefs, "gis/offline", offline);
 283         viewer->offline = offline;
 284         _gis_viewer_emit_offline(viewer);
 285 }
 286
 287 gboolean gis_viewer_get_offline(GisViewer *viewer)
 288 {
 289         g_assert(GIS_IS_VIEWER(viewer));
 290         g_debug("GisViewer: get_offline - %d", viewer->offline);
 291         return viewer->offline;
 292 }
 293
 294 /* To be implemented by subclasses */
 295 void gis_viewer_center_position(GisViewer *viewer,
 296                 gdouble lat, gdouble lon, gdouble elev)
 297 {
 298         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 299         if (!klass->center_position)
 300                 g_warning("GisViewer: center_position - Unimplemented");
 301         klass->center_position(viewer, lat, lon, elev);
 302 }
 303
 304 void gis_viewer_project(GisViewer *viewer,
 305                 gdouble lat, gdouble lon, gdouble elev,
 306                 gdouble *px, gdouble *py, gdouble *pz)
 307 {
 308         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 309         if (!klass->project)
 310                 g_warning("GisViewer: project - Unimplemented");
 311         klass->project(viewer, lat, lon, elev, px, py, pz);
 312 }
 313
 314 void gis_viewer_clear_height_func(GisViewer *viewer)
 315 {
 316         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 317         if (!klass->clear_height_func)
 318                 g_warning("GisViewer: clear_height_func - Unimplemented");
 319         klass->clear_height_func(viewer);
 320 }
 321
 322 void gis_viewer_set_height_func(GisViewer *viewer, GisTile *tile,
 323                 GisHeightFunc height_func, gpointer user_data,
 324                 gboolean update)
 325 {
 326         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 327         if (!klass->set_height_func)
 328                 g_warning("GisViewer: set_height_func - Unimplemented");
 329         klass->set_height_func(viewer, tile, height_func, user_data, update);
 330 }
 331
 332 gpointer gis_viewer_add(GisViewer *viewer, GisObject *object,
 333                 gint level, gboolean sort)
 334 {
 335         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 336         if (!klass->add)
 337                 g_warning("GisViewer: add - Unimplemented");
 338         return klass->add(viewer, object, level, sort);
 339 }
 340
 341 GisObject *gis_viewer_remove(GisViewer *viewer, gpointer ref)
 342 {
 343         GisViewerClass *klass = GIS_VIEWER_GET_CLASS(viewer);
 344         if (!klass->remove)
 345                 g_warning("GisViewer: remove - Unimplemented");
 346         return klass->remove(viewer, ref);
 347 }
 348
 349 /****************
 350  * GObject code *
 351  ****************/
 352 G_DEFINE_ABSTRACT_TYPE(GisViewer, gis_viewer, GTK_TYPE_DRAWING_AREA);
 353 static void gis_viewer_init(GisViewer *viewer)
 354 {
 355         g_debug("GisViewer: init");
 356         /* Default values */
 357         viewer->time = g_strdup("");
 358         viewer->location[0] = 40;
 359         viewer->location[1] = -100;
 360         viewer->location[2] = 1.5*EARTH_R;
 361         viewer->rotation[0] = 0;
 362         viewer->rotation[1] = 0;
 363         viewer->rotation[2] = 0;
 364
 365         g_object_set(viewer, "can-focus", TRUE, NULL);
 366         gtk_widget_add_events(GTK_WIDGET(viewer),
 367                         GDK_BUTTON_PRESS_MASK |
 368                         GDK_BUTTON_RELEASE_MASK |
 369                         GDK_POINTER_MOTION_MASK |
 370                         GDK_KEY_PRESS_MASK);
 371
 372         g_signal_connect(viewer, "key-press-event",      G_CALLBACK(on_key_press),      NULL);
 373
 374         g_signal_connect(viewer, "button-press-event",   G_CALLBACK(on_button_press),   NULL);
 375         g_signal_connect(viewer, "button-release-event", G_CALLBACK(on_button_release), NULL);
 376         g_signal_connect(viewer, "motion-notify-event",  G_CALLBACK(on_motion_notify),  NULL);
 377
 378         g_signal_connect(viewer, "location-changed",     G_CALLBACK(on_view_changed),   NULL);
 379         g_signal_connect(viewer, "rotation-changed",     G_CALLBACK(on_view_changed),   NULL);
 380 }
 381 static void gis_viewer_finalize(GObject *gobject)
 382 {
 383         g_debug("GisViewer: finalize");
 384         GisViewer *viewer = GIS_VIEWER(gobject);
 385         g_free(viewer->time);
 386         G_OBJECT_CLASS(gis_viewer_parent_class)->finalize(gobject);
 387 }
 388 static void gis_viewer_class_init(GisViewerClass *klass)
 389 {
 390         g_debug("GisViewer: class_init");
 391         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 392         gobject_class->finalize     = gis_viewer_finalize;
 393         signals[SIG_TIME_CHANGED] = g_signal_new(
 394                         "time-changed",
 395                         G_TYPE_FROM_CLASS(gobject_class),
 396                         G_SIGNAL_RUN_LAST,
 397                         0,
 398                         NULL,
 399                         NULL,
 400                         g_cclosure_marshal_VOID__STRING,
 401                         G_TYPE_NONE,
 402                         1,
 403                         G_TYPE_STRING);
 404         signals[SIG_LOCATION_CHANGED] = g_signal_new(
 405                         "location-changed",
 406                         G_TYPE_FROM_CLASS(gobject_class),
 407                         G_SIGNAL_RUN_LAST,
 408                         0,
 409                         NULL,
 410                         NULL,
 411                         gis_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 412                         G_TYPE_NONE,
 413                         3,
 414                         G_TYPE_DOUBLE,
 415                         G_TYPE_DOUBLE,
 416                         G_TYPE_DOUBLE);
 417         signals[SIG_ROTATION_CHANGED] = g_signal_new(
 418                         "rotation-changed",
 419                         G_TYPE_FROM_CLASS(gobject_class),
 420                         G_SIGNAL_RUN_LAST,
 421                         0,
 422                         NULL,
 423                         NULL,
 424                         gis_cclosure_marshal_VOID__DOUBLE_DOUBLE_DOUBLE,
 425                         G_TYPE_NONE,
 426                         3,
 427                         G_TYPE_DOUBLE,
 428                         G_TYPE_DOUBLE,
 429                         G_TYPE_DOUBLE);
 430         signals[SIG_REFRESH] = g_signal_new(
 431                         "refresh",
 432                         G_TYPE_FROM_CLASS(gobject_class),
 433                         G_SIGNAL_RUN_LAST,
 434                         0,
 435                         NULL,
 436                         NULL,
 437                         g_cclosure_marshal_VOID__VOID,
 438                         G_TYPE_NONE,
 439                         0);
 440         signals[SIG_OFFLINE] = g_signal_new(
 441                         "offline",
 442                         G_TYPE_FROM_CLASS(gobject_class),
 443                         G_SIGNAL_RUN_LAST,
 444                         0,
 445                         NULL,
 446                         NULL,
 447                         g_cclosure_marshal_VOID__BOOLEAN,
 448                         G_TYPE_NONE,
 449                         1,
 450                         G_TYPE_BOOLEAN);
 451 }