Pileus Git - grits/blob - src/aweather-gui.c

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   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 <gtk/gtk.h>
  20 #include <gtk/gtkgl.h>
  21 #include <gdk/gdkkeysyms.h>
  22 #include <GL/gl.h>
  23 #include <GL/glu.h>
  24 #include <math.h>
  25
  26 #include "misc.h"
  27 #include "aweather-gui.h"
  28 #include "aweather-view.h"
  29 #include "aweather-plugin.h"
  30 #include "location.h"
  31
  32 /****************
  33  * GObject code *
  34  ****************/
  35 G_DEFINE_TYPE(AWeatherGui, aweather_gui, GTK_TYPE_WINDOW);
  36 static void aweather_gui_init(AWeatherGui *gui)
  37 {
  38         gui->plugins = NULL;
  39         g_debug("AWeatherGui: init");
  40 }
  41 static GObject *aweather_gui_constructor(GType gtype, guint n_properties,
  42                 GObjectConstructParam *properties)
  43 {
  44         g_debug("aweather_gui: constructor");
  45         GObjectClass *parent_class = G_OBJECT_CLASS(aweather_gui_parent_class);
  46         return  parent_class->constructor(gtype, n_properties, properties);
  47 }
  48 static void aweather_gui_dispose(GObject *gobject)
  49 {
  50         g_debug("AWeatherGui: dispose");
  51         AWeatherGui *gui = AWEATHER_GUI(gobject);
  52         if (gui->view) {
  53                 g_object_unref(gui->view);
  54                 gui->view = NULL;
  55         }
  56         if (gui->builder) {
  57                 /* Reparent to avoid double unrefs */
  58                 GtkWidget *body   = aweather_gui_get_widget(gui, "body");
  59                 GtkWidget *window = aweather_gui_get_widget(gui, "window");
  60                 gtk_widget_reparent(body, window);
  61                 g_object_unref(gui->builder);
  62                 gui->builder = NULL;
  63         }
  64         if (gui->plugins) {
  65                 g_list_foreach(gui->plugins, (GFunc)g_object_unref, NULL);
  66                 g_list_free(gui->plugins);
  67                 gui->plugins = NULL;
  68         }
  69         //for (GList *cur = gui->plugins; cur; cur = cur->next)
  70         //      g_object_unref(cur->data);
  71         G_OBJECT_CLASS(aweather_gui_parent_class)->dispose(gobject);
  72 }
  73 static void aweather_gui_finalize(GObject *gobject)
  74 {
  75         g_debug("AWeatherGui: finalize");
  76         G_OBJECT_CLASS(aweather_gui_parent_class)->finalize(gobject);
  77         gtk_main_quit();
  78
  79 }
  80 static void aweather_gui_class_init(AWeatherGuiClass *klass)
  81 {
  82         g_debug("AWeatherGui: class_init");
  83         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
  84         gobject_class->constructor  = aweather_gui_constructor;
  85         gobject_class->dispose      = aweather_gui_dispose;
  86         gobject_class->finalize     = aweather_gui_finalize;
  87 }
  88
  89 /*************
  90  * Callbacks *
  91  *************/
  92 gboolean on_drawing_button_press(GtkWidget *widget, GdkEventButton *event, AWeatherGui *gui)
  93 {
  94         g_debug("AWeatherGui: on_drawing_button_press - Grabbing focus");
  95         GtkWidget *drawing = aweather_gui_get_widget(gui, "drawing");
  96         gtk_widget_grab_focus(drawing);
  97         return TRUE;
  98 }
  99 gboolean on_drawing_key_press(GtkWidget *widget, GdkEventKey *event, AWeatherGui *gui)
 100 {
 101         g_debug("AWeatherGui: on_drawing_key_press - key=%x, state=%x, plus=%x",
 102                         event->keyval, event->state, GDK_plus);
 103         AWeatherView *view = aweather_gui_get_view(gui);
 104         double x,y,z;
 105         aweather_view_get_location(view, &x, &y, &z);
 106         guint kv = event->keyval;
 107         if      (kv == GDK_Left  || kv == GDK_h) aweather_view_pan(view, -z/10, 0, 0);
 108         else if (kv == GDK_Down  || kv == GDK_j) aweather_view_pan(view, 0, -z/10, 0);
 109         else if (kv == GDK_Up    || kv == GDK_k) aweather_view_pan(view, 0,  z/10, 0);
 110         else if (kv == GDK_Right || kv == GDK_l) aweather_view_pan(view,  z/10, 0, 0);
 111         else if (kv == GDK_minus || kv == GDK_o) aweather_view_zoom(view, 10./9);
 112         else if (kv == GDK_plus  || kv == GDK_i) aweather_view_zoom(view, 9./10);
 113         else if (kv == GDK_H                   ) aweather_view_rotate(view,  0, -10, 0);
 114         else if (kv == GDK_J                   ) aweather_view_rotate(view,  10,  0, 0);
 115         else if (kv == GDK_K                   ) aweather_view_rotate(view, -10,  0, 0);
 116         else if (kv == GDK_L                   ) aweather_view_rotate(view,  0,  10, 0);
 117         return TRUE;
 118 }
 119
 120 gboolean on_gui_key_press(GtkWidget *widget, GdkEventKey *event, AWeatherGui *gui)
 121 {
 122         g_debug("AWeatherGui: on_gui_key_press - key=%x, state=%x",
 123                         event->keyval, event->state);
 124         AWeatherView *view = aweather_gui_get_view(gui);
 125         if (event->keyval == GDK_q)
 126                 gtk_widget_destroy(GTK_WIDGET(gui));
 127         else if (event->keyval == GDK_r && event->state & GDK_CONTROL_MASK)
 128                 aweather_view_refresh(view);
 129         else if (event->keyval == GDK_Tab || event->keyval == GDK_ISO_Left_Tab) {
 130                 GtkNotebook *tabs = GTK_NOTEBOOK(aweather_gui_get_widget(gui, "tabs"));
 131                 gint num_tabs = gtk_notebook_get_n_pages(tabs);
 132                 gint cur_tab  = gtk_notebook_get_current_page(tabs);
 133                 if (event->state & GDK_SHIFT_MASK)
 134                         gtk_notebook_set_current_page(tabs, (cur_tab-1)%num_tabs);
 135                 else
 136                         gtk_notebook_set_current_page(tabs, (cur_tab+1)%num_tabs);
 137         };
 138         return FALSE;
 139 }
 140
 141 void on_quit(GtkMenuItem *menu, AWeatherGui *gui)
 142 {
 143         gtk_widget_destroy(GTK_WIDGET(gui));
 144 }
 145
 146 void on_offline(GtkToggleAction *action, AWeatherGui *gui)
 147 {
 148         AWeatherView *view = aweather_gui_get_view(gui);
 149         aweather_view_set_offline(view,
 150                 gtk_toggle_action_get_active(action));
 151 }
 152
 153 void on_zoomin(GtkAction *action, AWeatherGui *gui)
 154 {
 155         AWeatherView *view = aweather_gui_get_view(gui);
 156         aweather_view_zoom(view, 3./4);
 157 }
 158
 159 void on_zoomout(GtkAction *action, AWeatherGui *gui)
 160 {
 161         AWeatherView *view = aweather_gui_get_view(gui);
 162         aweather_view_zoom(view, 4./3);
 163 }
 164
 165 void on_refresh(GtkAction *action, AWeatherGui *gui)
 166 {
 167         AWeatherView *view = aweather_gui_get_view(gui);
 168         aweather_view_refresh(view);
 169 }
 170
 171 void on_about(GtkAction *action, AWeatherGui *gui)
 172 {
 173         // TODO: use gtk_widget_hide_on_delete()
 174         GError *error = NULL;
 175         GtkBuilder *builder = gtk_builder_new();
 176         if (!gtk_builder_add_from_file(builder, DATADIR "/aweather/about.ui", &error))
 177                 g_error("Failed to create gtk builder: %s", error->message);
 178         gtk_builder_connect_signals(builder, NULL);
 179         GtkWidget *window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));
 180         gtk_window_set_transient_for(GTK_WINDOW(window),
 181                         GTK_WINDOW(aweather_gui_get_widget(gui, "window")));
 182         gtk_widget_show_all(window);
 183         g_object_unref(builder);
 184 }
 185
 186 void on_time_changed(GtkTreeView *view, GtkTreePath *path,
 187                 GtkTreeViewColumn *column, AWeatherGui *gui)
 188 {
 189         gchar *time;
 190         GtkTreeIter iter;
 191         GtkTreeModel *model = gtk_tree_view_get_model(view);
 192         gtk_tree_model_get_iter(model, &iter, path);
 193         gtk_tree_model_get(model, &iter, 0, &time, -1);
 194         AWeatherView *aview = aweather_gui_get_view(gui);
 195         aweather_view_set_time(aview, time);
 196         g_free(time);
 197 }
 198
 199 void on_site_changed(GtkComboBox *combo, AWeatherGui *gui)
 200 {
 201         gchar *site;
 202         GtkTreeIter iter;
 203         GtkTreeModel *model = gtk_combo_box_get_model(combo);
 204         gtk_combo_box_get_active_iter(combo, &iter);
 205         gtk_tree_model_get(model, &iter, 1, &site, -1);
 206         AWeatherView *view = aweather_gui_get_view(gui);
 207         aweather_view_set_site(view, site);
 208         g_free(site);
 209 }
 210
 211 gboolean on_map(GtkWidget *da, GdkEventConfigure *event, AWeatherGui *gui)
 212 {
 213         g_debug("AWeatherGui: on_map");
 214         AWeatherView *view = aweather_gui_get_view(gui);
 215
 216         /* Misc */
 217         glEnable(GL_BLEND);
 218         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 219         glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 220
 221         /* Tessellation, "finding intersecting triangles" */
 222         /* http://research.microsoft.com/pubs/70307/tr-2006-81.pdf */
 223         /* http://www.opengl.org/wiki/Alpha_Blending */
 224         glAlphaFunc(GL_GREATER,0.1);
 225         glEnable(GL_ALPHA_TEST);
 226
 227         /* Depth test */
 228         glClearDepth(1.0);
 229         glDepthFunc(GL_LEQUAL);
 230         glEnable(GL_DEPTH_TEST);
 231
 232         aweather_gui_gl_end(gui);
 233         return FALSE;
 234 }
 235
 236 gboolean on_configure(GtkWidget *da, GdkEventConfigure *event, AWeatherGui *gui)
 237 {
 238         g_debug("AWeatherGui: on_confiure");
 239         aweather_gui_gl_begin(gui);
 240
 241         double x, y, z;
 242         AWeatherView *view = aweather_gui_get_view(gui);
 243         aweather_view_get_location(view, &x, &y, &z);
 244
 245         /* Window is at 500 m from camera */
 246         double width  = da->allocation.width;
 247         double height = da->allocation.height;
 248
 249         glViewport(0, 0, width, height);
 250
 251         /* Perspective */
 252         glMatrixMode(GL_PROJECTION);
 253         glLoadIdentity();
 254         double ang = atan((height/2)/500);
 255
 256         //gluPerspective(r2d(ang)*2, width/height, -z-20, -z+20);
 257         gluPerspective(r2d(ang)*2, width/height, 1, 500*1000);
 258
 259         aweather_gui_gl_end(gui);
 260         return FALSE;
 261 }
 262
 263 gboolean on_expose(GtkWidget *da, GdkEventExpose *event, AWeatherGui *gui)
 264 {
 265         g_debug("AWeatherGui: on_expose - begin");
 266         aweather_gui_gl_begin(gui);
 267
 268         double lx, ly, lz;
 269         double rx, ry, rz;
 270         AWeatherView *view = aweather_gui_get_view(gui);
 271         aweather_view_get_location(view, &lx, &ly, &lz);
 272         aweather_view_get_rotation(view, &rx, &ry, &rz);
 273
 274         glMatrixMode(GL_MODELVIEW);
 275         glLoadIdentity();
 276         glTranslatef(lx, ly, lz);
 277         glRotatef(rx, 1, 0, 0);
 278         glRotatef(ry, 0, 1, 0);
 279         glRotatef(rz, 0, 0, 1);
 280
 281         /* Expose plugins */
 282         for (GList *cur = gui->plugins; cur; cur = cur->next) {
 283                 AWeatherPlugin *plugin = AWEATHER_PLUGIN(cur->data);
 284                 aweather_plugin_expose(plugin);
 285         }
 286
 287         aweather_gui_gl_end(gui);
 288         aweather_gui_gl_flush(gui);
 289         g_debug("AWeatherGui: on_expose - end\n");
 290         return FALSE;
 291 }
 292
 293 void on_state_changed(AWeatherView *view,
 294                 gdouble x, gdouble y, gdouble z, AWeatherGui *gui)
 295 {
 296         /* Reset clipping area and redraw */
 297         GtkWidget *da = aweather_gui_get_widget(gui, "drawing");
 298         on_configure(da, NULL, gui);
 299         aweather_gui_gl_redraw(gui);
 300 }
 301
 302 /* TODO: replace the code in these with `gtk_tree_model_find' utility */
 303 static void update_time_widget(AWeatherView *view, const char *time, AWeatherGui *gui)
 304 {
 305         g_debug("AWeatherGui: update_time_widget - time=%s", time);
 306         GtkTreeView  *tview = GTK_TREE_VIEW(aweather_gui_get_widget(gui, "time"));
 307         GtkTreeModel *model = GTK_TREE_MODEL(gtk_tree_view_get_model(tview));
 308         for (int i = 0; i < gtk_tree_model_iter_n_children(model, NULL); i++) {
 309                 char *text;
 310                 GtkTreeIter iter;
 311                 gtk_tree_model_iter_nth_child(model, &iter, NULL, i);
 312                 gtk_tree_model_get(model, &iter, 0, &text, -1);
 313                 if (g_str_equal(text, time)) {
 314                         GtkTreePath *path = gtk_tree_model_get_path(model, &iter);
 315                         g_signal_handlers_block_by_func(tview,
 316                                         G_CALLBACK(on_site_changed), gui);
 317                         gtk_tree_view_set_cursor(tview, path, NULL, FALSE);
 318                         g_signal_handlers_unblock_by_func(tview,
 319                                         G_CALLBACK(on_site_changed), gui);
 320                         gtk_tree_path_free(path);
 321                         g_free(text);
 322                         return;
 323                 }
 324                 g_free(text);
 325         }
 326 }
 327 static void update_site_widget(AWeatherView *view, char *site, AWeatherGui *gui)
 328 {
 329         g_debug("AWeatherGui: updat_site_widget - site=%s", site);
 330         GtkComboBox  *combo = GTK_COMBO_BOX(aweather_gui_get_widget(gui, "site"));
 331         GtkTreeModel *model = GTK_TREE_MODEL(gtk_combo_box_get_model(combo));
 332         for (int i = 0; i < gtk_tree_model_iter_n_children(model, NULL); i++) {
 333                 GtkTreeIter iter1;
 334                 gtk_tree_model_iter_nth_child(model, &iter1, NULL, i);
 335                 for (int i = 0; i < gtk_tree_model_iter_n_children(model, &iter1); i++) {
 336                         GtkTreeIter iter2;
 337                         gtk_tree_model_iter_nth_child(model, &iter2, &iter1, i);
 338                         char *text;
 339                         gtk_tree_model_get(model, &iter2, 1, &text, -1);
 340                         if (text == NULL)
 341                                 continue;
 342                         if (g_str_equal(text, site)) {
 343                                 g_signal_handlers_block_by_func(combo,
 344                                                 G_CALLBACK(on_site_changed), gui);
 345                                 gtk_combo_box_set_active_iter(combo, &iter2);
 346                                 g_signal_handlers_unblock_by_func(combo,
 347                                                 G_CALLBACK(on_site_changed), gui);
 348                                 g_free(text);
 349                                 return;
 350                         }
 351                         g_free(text);
 352                 }
 353         }
 354 }
 355
 356 /*****************
 357  * Setup helpers *
 358  *****************/
 359 static void combo_sensitive(GtkCellLayout *cell_layout, GtkCellRenderer *cell,
 360                 GtkTreeModel *tree_model, GtkTreeIter *iter, gpointer data)
 361 {
 362         gboolean sensitive = !gtk_tree_model_iter_has_child(tree_model, iter);
 363         g_object_set(cell, "sensitive", sensitive, NULL);
 364 }
 365
 366 static void site_setup(AWeatherGui *gui)
 367 {
 368         GtkTreeIter state, city;
 369         GtkTreeStore *store = GTK_TREE_STORE(aweather_gui_get_object(gui, "sites"));
 370         for (int i = 0; cities[i].label; i++) {
 371                 if (cities[i].type == LOCATION_STATE) {
 372                         gtk_tree_store_append(store, &state, NULL);
 373                         gtk_tree_store_set   (store, &state, 0, cities[i].label,
 374                                                              1, cities[i].code,  -1);
 375                 } else {
 376                         gtk_tree_store_append(store, &city, &state);
 377                         gtk_tree_store_set   (store, &city, 0, cities[i].label,
 378                                                             1, cities[i].code,  -1);
 379                 }
 380         }
 381
 382         GtkWidget *combo    = aweather_gui_get_widget(gui, "site");
 383         GObject   *renderer = aweather_gui_get_object(gui, "site_rend");
 384         gtk_cell_layout_set_cell_data_func(GTK_CELL_LAYOUT(combo),
 385                         GTK_CELL_RENDERER(renderer), combo_sensitive, NULL, NULL);
 386
 387         AWeatherView *aview = aweather_gui_get_view(gui);
 388         g_signal_connect(aview, "site-changed", G_CALLBACK(update_site_widget), gui);
 389 }
 390
 391 static void time_setup(AWeatherGui *gui)
 392 {
 393         GtkTreeView       *tview = GTK_TREE_VIEW(aweather_gui_get_widget(gui, "time"));
 394         GtkCellRenderer   *rend  = gtk_cell_renderer_text_new();
 395         GtkTreeViewColumn *col   = gtk_tree_view_column_new_with_attributes(
 396                                         "Time", rend, "text", 0, NULL);
 397
 398         gtk_tree_view_append_column(tview, col);
 399         g_object_set(rend, "size-points", 8.0, NULL);
 400
 401         AWeatherView *aview = aweather_gui_get_view(gui);
 402         g_signal_connect(aview, "time-changed", G_CALLBACK(update_time_widget), gui);
 403 }
 404
 405 static void opengl_setup(AWeatherGui *gui)
 406 {
 407         GtkDrawingArea *drawing = GTK_DRAWING_AREA(aweather_gui_get_widget(gui, "drawing"));
 408
 409         GdkGLConfig *glconfig = gdk_gl_config_new_by_mode(
 410                         GDK_GL_MODE_RGBA   | GDK_GL_MODE_DEPTH |
 411                         GDK_GL_MODE_DOUBLE | GDK_GL_MODE_ALPHA);
 412         if (!glconfig)
 413                 g_error("Failed to create glconfig");
 414         if (!gtk_widget_set_gl_capability(GTK_WIDGET(drawing),
 415                                 glconfig, NULL, TRUE, GDK_GL_RGBA_TYPE))
 416                 g_error("GL lacks required capabilities");
 417
 418         /* Set up OpenGL Stuff, glade doesn't like doing these */
 419         g_signal_connect(drawing, "map-event",       G_CALLBACK(on_map),       gui);
 420         g_signal_connect(drawing, "configure-event", G_CALLBACK(on_configure), gui);
 421         g_signal_connect(drawing, "expose-event",    G_CALLBACK(on_expose),    gui);
 422 }
 423
 424
 425
 426 /***********
 427  * Methods *
 428  ***********/
 429 AWeatherGui *aweather_gui_new()
 430 {
 431         g_debug("AWeatherGui: new");
 432         GError *error = NULL;
 433
 434         AWeatherGui *self = g_object_new(AWEATHER_TYPE_GUI, NULL);
 435         self->view    = aweather_view_new();
 436         self->builder = gtk_builder_new();
 437         if (!gtk_builder_add_from_file(self->builder, DATADIR "/aweather/main.ui", &error))
 438                 g_error("Failed to create gtk builder: %s", error->message);
 439         gtk_widget_reparent(aweather_gui_get_widget(self, "body"), GTK_WIDGET(self));
 440
 441         /* Connect signals */
 442         gtk_builder_connect_signals(self->builder, self);
 443         g_signal_connect(self, "key-press-event",
 444                         G_CALLBACK(on_gui_key_press), self);
 445         g_signal_connect(self->view, "location-changed",
 446                         G_CALLBACK(on_state_changed), self);
 447         g_signal_connect(self->view, "rotation-changed",
 448                         G_CALLBACK(on_state_changed), self);
 449         g_signal_connect_swapped(self->view, "offline",
 450                         G_CALLBACK(gtk_toggle_action_set_active),
 451                         aweather_gui_get_object(self, "offline"));
 452
 453         /* Load components */
 454         site_setup(self);
 455         time_setup(self);
 456         opengl_setup(self);
 457
 458         return self;
 459 }
 460 AWeatherView *aweather_gui_get_view(AWeatherGui *gui)
 461 {
 462         g_assert(AWEATHER_IS_GUI(gui));
 463         return gui->view;
 464 }
 465 GtkBuilder *aweather_gui_get_builder(AWeatherGui *gui)
 466 {
 467         g_debug("AWeatherGui: get_builder");
 468         g_assert(AWEATHER_IS_GUI(gui));
 469         return gui->builder;
 470 }
 471 GtkWidget *aweather_gui_get_widget(AWeatherGui *gui, const gchar *name)
 472 {
 473         g_debug("AWeatherGui: get_widget - name=%s", name);
 474         g_assert(AWEATHER_IS_GUI(gui));
 475         GObject *widget = gtk_builder_get_object(gui->builder, name);
 476         if (!GTK_IS_WIDGET(widget))
 477                 g_error("Failed to get widget `%s'", name);
 478         return GTK_WIDGET(widget);
 479 }
 480 GObject *aweather_gui_get_object(AWeatherGui *gui, const gchar *name)
 481 {
 482         g_debug("AWeatherGui: get_widget - name=%s", name);
 483         g_assert(AWEATHER_IS_GUI(gui));
 484         return gtk_builder_get_object(gui->builder, name);
 485 }
 486 void aweather_gui_register_plugin(AWeatherGui *gui, AWeatherPlugin *plugin)
 487 {
 488         g_debug("AWeatherGui: register_plugin");
 489         gui->plugins = g_list_append(gui->plugins, plugin);
 490 }
 491 void aweather_gui_gl_redraw(AWeatherGui *gui)
 492 {
 493         g_debug("AWeatherGui: gl_redraw");
 494         GtkWidget *drawing = aweather_gui_get_widget(gui, "drawing");
 495         gtk_widget_queue_draw(drawing);
 496 }
 497 void aweather_gui_gl_begin(AWeatherGui *gui)
 498 {
 499         g_assert(AWEATHER_IS_GUI(gui));
 500
 501         GtkDrawingArea *drawing    = GTK_DRAWING_AREA(aweather_gui_get_widget(gui, "drawing"));
 502         GdkGLContext   *glcontext  = gtk_widget_get_gl_context(GTK_WIDGET(drawing));
 503         GdkGLDrawable  *gldrawable = gtk_widget_get_gl_drawable(GTK_WIDGET(drawing));
 504
 505         if (!gdk_gl_drawable_gl_begin(gldrawable, glcontext))
 506                 g_assert_not_reached();
 507
 508         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 509 }
 510 void aweather_gui_gl_end(AWeatherGui *gui)
 511 {
 512         g_assert(AWEATHER_IS_GUI(gui));
 513         GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
 514         gdk_gl_drawable_gl_end(gldrawable);
 515 }
 516 void aweather_gui_gl_flush(AWeatherGui *gui)
 517 {
 518         g_assert(AWEATHER_IS_GUI(gui));
 519         GdkGLDrawable *gldrawable = gdk_gl_drawable_get_current();
 520         if (gdk_gl_drawable_is_double_buffered(gldrawable))
 521                 gdk_gl_drawable_swap_buffers(gldrawable);
 522         else
 523                 glFlush();
 524         gdk_gl_drawable_gl_end(gldrawable);
 525 }