+static gboolean compass_draw_teapot(gdouble scale, GritsPluginEnv *env)
+{
+ static int teatime = 0;
+#ifdef HAVE_GLUT
+ static int init, argc; char *argv[] = {"", NULL};
+ if (!init) {
+ teatime = grits_prefs_get_boolean(env->prefs, "grits/teatime", NULL);
+ glutInit(&argc, argv);
+ init = 1;
+ g_message("teatime=%d", teatime);
+ }
+
+ if (teatime) {
+ /* Setup lighting */
+ float light_ambient[] = {0.1f, 0.1f, 0.0f, 1.0f};
+ float light_diffuse[] = {0.9f, 0.9f, 0.9f, 1.0f};
+ float light_position[] = {-50.0f, -40.0f, -80.0f, 1.0f};
+ glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
+ glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
+ glLightfv(GL_LIGHT0, GL_POSITION, light_position);
+
+ /* Draw teapot */
+ glRotatef(-90, 0, 0, 1);
+ glRotatef(-90, 1, 0, 0);
+ glColor4f(0.9, 0.9, 0.7, 1.0);
+ glutSolidTeapot(scale * 0.60);
+ }
+#endif
+ return teatime;
+}
+
+static void compass_expose(GritsCallback *compass, GritsOpenGL *opengl, gpointer _env)
+{
+ GritsPluginEnv *env = GRITS_PLUGIN_ENV(_env);
+ g_debug("GritsPluginEnv: compass_expose");
+ gdouble x, y, z;
+ grits_viewer_get_rotation(env->viewer, &x, &y, &z);
+
+ /* Setup projection */
+ gint win_width = GTK_WIDGET(opengl)->allocation.width;
+ gint win_height = GTK_WIDGET(opengl)->allocation.height;
+ float scale = CLAMP(MIN(win_width,win_height)/2.0 * 0.1, 40, 100);
+ float offset = scale + 20;
+ glTranslatef(win_width - offset, offset, 0);
+
+ /* Setup state */
+ glClear(GL_DEPTH_BUFFER_BIT);
+ glEnable(GL_COLOR_MATERIAL);
+ glEnable(GL_DEPTH_TEST);
+ glDisable(GL_CULL_FACE);
+ glEnable(GL_POLYGON_SMOOTH);
+ glEnable(GL_LINE_SMOOTH);
+
+ /* Draw compass */
+ x = CLAMP(x, -66, 66);;
+ glRotatef(x, 1, 0, 0);
+ glRotatef(-z, 0, 0, 1);
+ if (!compass_draw_teapot(scale, env))
+ compass_draw_compass(scale);
+}
+
+static gboolean compass_click(GritsCallback *compass, GdkEvent *evnet, GritsViewer *viewer)
+{
+ grits_viewer_set_rotation(viewer, 0, 0, 0);
+ return TRUE;
+}
+
+/* Info */
+static void info_expose(GritsCallback *compass, GritsOpenGL *opengl, gpointer _env)
+{
+ gint win_width = GTK_WIDGET(opengl)->allocation.width;
+ gint win_height = GTK_WIDGET(opengl)->allocation.height;
+
+ /* Create cairo surface */
+ guint tex = 0;
+ const gchar *label0 = "Location: %7.3lf°, %8.3lf°, %4.0fm";
+ const gchar *label1 = "Cursor: %7.3lf°, %8.3lf°, %4.0fm";
+ gdouble width = 300;
+ gdouble height = 200;
+ cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
+ cairo_t *cairo = cairo_create(surface);
+
+ /* Text */
+ gdouble lat, lon, elev;
+ grits_viewer_get_location(GRITS_VIEWER(opengl), &lat, &lon, &elev);
+ gchar *text0 = g_strdup_printf(label0, lat, lon, elev);
+ gchar *text1 = g_strdup_printf(label1, lat, lon, elev);
+
+ /* Draw outline */
+ cairo_set_line_width(cairo, 3);
+ cairo_set_source_rgba(cairo, 0, 0, 0, 0.75);
+ cairo_move_to(cairo, 2, 20); cairo_text_path(cairo, text0);
+ cairo_move_to(cairo, 2, 40); cairo_text_path(cairo, text1);
+ cairo_stroke(cairo);
+
+ /* Draw filler */
+ cairo_set_source_rgba(cairo, 1, 1, 1, 1);
+ cairo_move_to(cairo, 2, 20); cairo_show_text(cairo, text0);
+ cairo_move_to(cairo, 2, 40); cairo_show_text(cairo, text1);
+
+ /* Setup pango */
+ PangoLayout *layout = pango_cairo_create_layout(cairo);
+ PangoFontDescription *font = pango_font_description_from_string("Mono 9");
+ pango_layout_set_font_description(layout, font);
+ pango_font_description_free(font);
+ pango_layout_set_text(layout, text0, -1);
+ pango_cairo_update_layout(cairo, layout);
+ cairo_set_line_join(cairo, CAIRO_LINE_JOIN_ROUND);
+ cairo_move_to(cairo, 2, 40);
+ pango_cairo_layout_path(cairo, layout);
+ for (float w = 0.2; w <= 0.8; w+=0.2) {
+ cairo_set_line_width(cairo, (1-w)*8);
+ cairo_set_source_rgba(cairo, 0, 0, 0, w);
+ cairo_stroke_preserve(cairo);
+ }
+ cairo_set_source_rgba(cairo, 1, 1, 1, 1);
+ pango_cairo_show_layout(cairo, layout);
+
+ /* Load GL texture */
+ glEnable(GL_TEXTURE_2D);
+ glGenTextures(1, &tex);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glPixelStorei(GL_PACK_ALIGNMENT, 1);
+ glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height,
+ 0, GL_BGRA, GL_UNSIGNED_BYTE, cairo_image_surface_get_data(surface));
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+ /* Draw surface */
+ glDisable(GL_LIGHTING);
+ glDisable(GL_COLOR_MATERIAL);
+ glDisable(GL_DEPTH_TEST);
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, tex);
+ glDisable(GL_CULL_FACE);
+ glTranslatef(win_width - width, win_height - height, 0);
+ glBegin(GL_QUADS);
+ glTexCoord2f(1, 0); glVertex3f(width, 0 , 0); // 0 - 3 0
+ glTexCoord2f(1, 1); glVertex3f(width, height, 0); // 1 - | |
+ glTexCoord2f(0, 1); glVertex3f(0 , height, 0); // 2 - | |
+ glTexCoord2f(0, 0); glVertex3f(0 , 0 , 0); // 3 - 2----1
+ glEnd();
+}