2 * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
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.
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.
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/>.
19 * SECTION:grits-object
20 * @short_description: Base class for drawing operations
22 * Objects in grits are things which can be added to the viewer and will be
23 * displayed to the user. Each object has information such as it's location and
24 * level of detail which are used by the viewer to determine which objects
27 * Each #GritsObject is also a #GObject, but not every GObject in grits is a
28 * GritsObject. The "Object" part of the name is just coincidence.
35 #include "grits-object.h"
49 static guint signals[NUM_SIGNALS];
51 void grits_object_pickdraw(GritsObject *object, GritsOpenGL *opengl, gboolean pick)
53 GritsObjectClass *klass = GRITS_OBJECT_GET_CLASS(object);
55 g_warning("GritsObject: draw - Unimplemented");
59 /* Skip hidden objects */
63 /* Support GritsTester */
64 if (!GRITS_IS_OPENGL(opengl)) {
65 g_debug("GritsObject: draw - drawing raw object");
66 klass->draw(object, opengl);
70 /* Calculae distance for LOD and horizon tests */
71 GritsPoint *center = &object->center;
72 if ((!(object->skip & GRITS_SKIP_LOD) ||
73 !(object->skip & GRITS_SKIP_HORIZON)) &&
74 (center->elev != -EARTH_R)) {
76 gdouble eye[3], obj[3];
77 grits_viewer_get_location(GRITS_VIEWER(opengl),
78 &eye[0], &eye[1], &eye[2]);
79 gdouble elev = eye[2];
80 lle2xyz(eye[0], eye[1], eye[2],
81 &eye[0], &eye[1], &eye[2]);
82 lle2xyz(center->lat, center->lon, center->elev,
83 &obj[0], &obj[1], &obj[2]);
84 gdouble dist = distd(obj, eye);
86 /* Level of detail test */
87 if (!(object->skip & GRITS_SKIP_LOD)
89 if (object->lod < dist)
94 if (!(object->skip & GRITS_SKIP_HORIZON)) {
95 gdouble c = EARTH_R+elev;
97 gdouble horizon = sqrt(c*c - a*a);
103 /* Save state, draw, restore state */
104 g_mutex_lock(opengl->sphere_lock);
105 if (!(object->skip & GRITS_SKIP_STATE)) {
106 glPushAttrib(GL_ALL_ATTRIB_BITS);
107 glMatrixMode(GL_PROJECTION); glPushMatrix();
108 glMatrixMode(GL_MODELVIEW); glPushMatrix();
111 if (!(object->skip & GRITS_SKIP_CENTER))
112 grits_viewer_center_position(GRITS_VIEWER(opengl),
115 object->center.elev);
117 if (pick && klass->pick)
118 klass->pick(object, opengl);
120 klass->draw(object, opengl);
122 if (!(object->skip & GRITS_SKIP_STATE)) {
124 glMatrixMode(GL_PROJECTION); glPopMatrix();
125 glMatrixMode(GL_MODELVIEW); glPopMatrix();
127 g_mutex_unlock(opengl->sphere_lock);
132 * @object: the object
133 * @opengl: the viewer the object is being displayed in
135 * Perform any OpenGL commands necessasairy to draw the object.
137 * The GL_PROJECTION and GL_MODELVIEW matricies and GL_ALL_ATTRIB_BITS will be
138 * restored to the default state after the call to draw.
140 void grits_object_draw(GritsObject *object, GritsOpenGL *opengl)
142 grits_object_pickdraw(object, opengl, FALSE);
145 void grits_object_hide(GritsObject *object, gboolean hidden)
147 GritsObjectClass *klass = GRITS_OBJECT_GET_CLASS(object);
148 object->hidden = hidden;
150 klass->hide(object, hidden);
153 void grits_object_queue_draw(GritsObject *object)
156 gtk_widget_queue_draw(GTK_WIDGET(object->viewer));
160 void grits_object_pick_begin(GritsObject *object, GritsOpenGL *opengl)
162 object->state.picked = FALSE;
164 /* Check for connected signals */
165 for (int i = 0; i < NUM_SIGNALS; i++) {
166 if (g_signal_has_handler_pending(object, signals[i], 0, FALSE)) {
167 /* Someone is watching, render the object _once_ */
168 glPushName((guint)object);
169 grits_object_pickdraw(object, opengl, TRUE);
176 void grits_object_pick_pointer(GritsObject *object, double x, double y)
178 object->state.picked = TRUE;
181 void grits_object_pick_end(GritsObject *object)
183 if (object->state.picked) {
184 if (!object->state.selected)
185 g_signal_emit(object, signals[SIG_ENTER], 0);
186 object->state.selected = TRUE;
188 if (object->state.selected)
189 g_signal_emit(object, signals[SIG_LEAVE], 0);
190 object->state.selected = FALSE;
194 void grits_object_event(GritsObject *object, GdkEvent *event)
196 const int map[GDK_EVENT_LAST] = {
197 [GDK_BUTTON_PRESS ] SIG_BUTTON_PRESS,
198 [GDK_2BUTTON_PRESS ] SIG_BUTTON_PRESS,
199 [GDK_3BUTTON_PRESS ] SIG_BUTTON_PRESS,
200 [GDK_BUTTON_RELEASE] SIG_BUTTON_RELEASE,
201 [GDK_KEY_PRESS ] SIG_KEY_PRESS,
202 [GDK_KEY_RELEASE ] SIG_KEY_RELEASE,
203 [GDK_MOTION_NOTIFY ] SIG_MOTION,
205 if (!object->state.selected)
207 guint sig = map[event->type];
209 /* Handle button click */
210 if (sig == SIG_BUTTON_PRESS)
211 object->state.clicking = TRUE;
212 if (sig == SIG_BUTTON_RELEASE && object->state.clicking)
213 g_signal_emit(object, signals[SIG_CLICKED], 0, event);
214 if (sig == SIG_BUTTON_RELEASE || sig == SIG_MOTION)
215 object->state.clicking = FALSE;
217 /* Emit this signal */
218 if (!g_signal_has_handler_pending(object, signals[sig], 0, FALSE))
220 g_signal_emit(object, signals[sig], 0, event);
224 G_DEFINE_ABSTRACT_TYPE(GritsObject, grits_object, G_TYPE_OBJECT);
225 static void grits_object_init(GritsObject *object)
227 object->center.lat = 0;
228 object->center.lon = 0;
229 object->center.elev = -EARTH_R;
232 static void grits_object_class_init(GritsObjectClass *klass)
234 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
237 * GritsObject::enter:
238 * @object: the object.
240 * The ::enter signal is emitted when the pointer moves over the object
242 signals[SIG_ENTER] = g_signal_new(
244 G_TYPE_FROM_CLASS(gobject_class),
249 g_cclosure_marshal_VOID__VOID,
254 * GritsViewer::leave:
255 * @object: the object.
257 * The ::leave signal is emitted when the pointer moves away from the
260 signals[SIG_LEAVE] = g_signal_new(
262 G_TYPE_FROM_CLASS(gobject_class),
267 g_cclosure_marshal_VOID__VOID,
272 * GritsViewer::clicked:
273 * @object: the object.
275 * The ::clicked signal is emitted when the user clicks on the object
277 signals[SIG_CLICKED] = g_signal_new(
279 G_TYPE_FROM_CLASS(gobject_class),
284 g_cclosure_marshal_VOID__VOID,
289 * GritsViewer::button-press:
290 * @object: the object.
291 * @event: the GdkEventButton which triggered this signal
293 * The ::button-press signal is emitted when a button (typically from a
296 signals[SIG_BUTTON_PRESS] = g_signal_new(
298 G_TYPE_FROM_CLASS(gobject_class),
303 g_cclosure_marshal_VOID__POINTER,
309 * GritsViewer::button-release:
310 * @object: the object.
311 * @event: the GdkEventButton which triggered this signal
313 * The ::button-release signal is emitted when a button (typically from
314 * a mouse) is released.
316 signals[SIG_BUTTON_RELEASE] = g_signal_new(
318 G_TYPE_FROM_CLASS(gobject_class),
323 g_cclosure_marshal_VOID__POINTER,
329 * GritsViewer::key-press:
330 * @object: the object.
331 * @event: the GdkEventKey which triggered this signal
333 * The ::key-press signal is emitted when a key is pressed.
335 signals[SIG_KEY_PRESS] = g_signal_new(
337 G_TYPE_FROM_CLASS(gobject_class),
342 g_cclosure_marshal_VOID__POINTER,
348 * GritsViewer::key-release:
349 * @object: the object.
350 * @event: the GdkEventKey which triggered this signal
352 * The ::key-release signal is emitted when a key is released.
354 signals[SIG_KEY_RELEASE] = g_signal_new(
356 G_TYPE_FROM_CLASS(gobject_class),
361 g_cclosure_marshal_VOID__POINTER,
367 * GritsViewer::motion:
368 * @object: the object.
369 * @event: the GdkEventMotion which triggered this signal
371 * The ::motion signal is emitted the pointer moves over the object
373 signals[SIG_MOTION] = g_signal_new(
375 G_TYPE_FROM_CLASS(gobject_class),
380 g_cclosure_marshal_VOID__POINTER,