Pileus Git - grits/blob - src/objects/grits-object.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-object
  20  * @short_description: Base class for drawing operations
  21  *
  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
  25  * should be drawn.
  26  *
  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.
  29  */
  30
  31 #include <config.h>
  32 #include <math.h>
  33
  34 #include "gtkgl.h"
  35 #include "grits-object.h"
  36 #include "grits-marshal.h"
  37
  38 /* Constants */
  39 enum {
  40         SIG_ENTER,
  41         SIG_LEAVE,
  42         SIG_CLICKED,
  43         SIG_BUTTON_PRESS,
  44         SIG_BUTTON_RELEASE,
  45         SIG_KEY_PRESS,
  46         SIG_KEY_RELEASE,
  47         SIG_MOTION,
  48         NUM_SIGNALS,
  49 };
  50 static guint signals[NUM_SIGNALS];
  51
  52 void grits_object_pickdraw(GritsObject *object, GritsOpenGL *opengl, gboolean pick)
  53 {
  54         GritsObjectClass *klass = GRITS_OBJECT_GET_CLASS(object);
  55
  56         if (!klass->draw) {
  57                 g_warning("GritsObject: draw - Unimplemented");
  58                 return;
  59         }
  60
  61         /* Skip hidden objects */
  62         if (object->hidden)
  63                 return;
  64
  65         /* Skip object with no signals when picking */
  66         for (int i = 0; pick; i++) {
  67                 if (i == NUM_SIGNALS)
  68                         return;
  69                 if (g_signal_has_handler_pending(object, signals[i], 0, FALSE))
  70                         break;
  71         }
  72
  73         /* Support GritsTester */
  74         if (!GRITS_IS_OPENGL(opengl)) {
  75                 g_debug("GritsObject: draw - drawing raw object");
  76                 klass->draw(object, opengl);
  77                 return;
  78         }
  79
  80         /* Calculate distance for LOD and horizon tests */
  81         GritsPoint *center = &object->center;
  82         if ((!(object->skip & GRITS_SKIP_LOD) ||
  83              !(object->skip & GRITS_SKIP_HORIZON)) &&
  84             (center->elev != -EARTH_R)) {
  85                 /* LOD test */
  86                 gdouble eye[3], obj[3];
  87                 grits_viewer_get_location(GRITS_VIEWER(opengl),
  88                                 &eye[0], &eye[1], &eye[2]);
  89                 gdouble elev = eye[2];
  90                 lle2xyz(eye[0], eye[1], eye[2],
  91                                 &eye[0], &eye[1], &eye[2]);
  92                 lle2xyz(center->lat, center->lon, center->elev,
  93                                 &obj[0], &obj[1], &obj[2]);
  94                 gdouble dist = distd(obj, eye);
  95
  96                 /* Level of detail test */
  97                 if (!(object->skip & GRITS_SKIP_LOD)
  98                                 && object->lod > 0) {
  99                         if (object->lod < dist)
 100                                 return;
 101                 }
 102
 103                 /* Horizon test */
 104                 if (!(object->skip & GRITS_SKIP_HORIZON)) {
 105                         gdouble c = EARTH_R+elev;
 106                         gdouble a = EARTH_R;
 107                         gdouble horizon = sqrt(c*c - a*a);
 108                         if (dist > horizon)
 109                                 return;
 110                 }
 111         }
 112
 113         /* Save state, draw, restore state */
 114         g_mutex_lock(&opengl->sphere_lock);
 115         if (!(object->skip & GRITS_SKIP_STATE)) {
 116                 glPushAttrib(GL_ALL_ATTRIB_BITS);
 117                 glMatrixMode(GL_PROJECTION); glPushMatrix();
 118                 glMatrixMode(GL_MODELVIEW);  glPushMatrix();
 119         }
 120
 121         if (!(object->skip & GRITS_SKIP_CENTER))
 122                 grits_viewer_center_position(GRITS_VIEWER(opengl),
 123                                 object->center.lat,
 124                                 object->center.lon,
 125                                 object->center.elev);
 126
 127         if (pick && klass->pick)
 128                 klass->pick(object, opengl);
 129         else
 130                 klass->draw(object, opengl);
 131
 132         if (!(object->skip & GRITS_SKIP_STATE)) {
 133                 glPopAttrib();
 134                 glMatrixMode(GL_PROJECTION); glPopMatrix();
 135                 glMatrixMode(GL_MODELVIEW);  glPopMatrix();
 136         }
 137         g_mutex_unlock(&opengl->sphere_lock);
 138 }
 139
 140 /**
 141  * grits_object_draw:
 142  * @object: the object
 143  * @opengl: the viewer the object is being displayed in
 144  *
 145  * Perform any OpenGL commands necessasairy to draw the object.
 146  *
 147  * The GL_PROJECTION and GL_MODELVIEW matricies and GL_ALL_ATTRIB_BITS will be
 148  * restored to the default state after the call to draw.
 149  */
 150 void grits_object_draw(GritsObject *object, GritsOpenGL *opengl)
 151 {
 152         grits_object_pickdraw(object, opengl, FALSE);
 153 }
 154
 155 void grits_object_hide(GritsObject *object, gboolean hidden)
 156 {
 157         GritsObjectClass *klass = GRITS_OBJECT_GET_CLASS(object);
 158         object->hidden = hidden;
 159         if (klass->hide)
 160                 klass->hide(object, hidden);
 161 }
 162
 163 void grits_object_queue_draw(GritsObject *object)
 164 {
 165         if (object->viewer)
 166                 gtk_widget_queue_draw(GTK_WIDGET(object->viewer));
 167 }
 168
 169 void grits_object_set_cursor(GritsObject *object, GdkCursorType cursor)
 170 {
 171         // Used by grits OpenGL
 172         object->cursor = gdk_cursor_new(cursor);
 173 }
 174
 175 /* Event handling */
 176 void grits_object_pick(GritsObject *object, GritsOpenGL *opengl)
 177 {
 178         grits_object_pickdraw(object, opengl, TRUE);
 179 }
 180
 181 gboolean grits_object_set_pointer(GritsObject *object, GdkEvent *event, gboolean selected)
 182 {
 183         gboolean rval = FALSE;
 184         if (selected) {
 185                 if (!object->state.selected)
 186                         g_signal_emit(object, signals[SIG_ENTER], 0, event, &rval);
 187                 object->state.selected = TRUE;
 188         } else {
 189                 if (object->state.selected)
 190                         g_signal_emit(object, signals[SIG_LEAVE], 0, event, &rval);
 191                 object->state.selected = FALSE;
 192         }
 193         return rval;
 194 }
 195
 196 gboolean grits_object_event(GritsObject *object, GdkEvent *event)
 197 {
 198         const int map[GDK_EVENT_LAST] = {
 199                 [GDK_BUTTON_PRESS  ] SIG_BUTTON_PRESS,
 200                 [GDK_2BUTTON_PRESS ] SIG_BUTTON_PRESS,
 201                 [GDK_3BUTTON_PRESS ] SIG_BUTTON_PRESS,
 202                 [GDK_BUTTON_RELEASE] SIG_BUTTON_RELEASE,
 203                 [GDK_KEY_PRESS     ] SIG_KEY_PRESS,
 204                 [GDK_KEY_RELEASE   ] SIG_KEY_RELEASE,
 205                 [GDK_MOTION_NOTIFY ] SIG_MOTION,
 206         };
 207         if (!object->state.selected)
 208                 return FALSE;
 209         guint sig = map[event->type];
 210         gboolean rval = FALSE;
 211
 212         /* Handle button click */
 213         if (sig == SIG_BUTTON_PRESS)
 214                 object->state.clicking = TRUE;
 215         if (sig == SIG_BUTTON_RELEASE && object->state.clicking)
 216                 g_signal_emit(object, signals[SIG_CLICKED], 0, event, &rval);
 217         if (sig == SIG_BUTTON_RELEASE || sig == SIG_MOTION)
 218                 object->state.clicking = FALSE;
 219
 220         /* Emit this signal */
 221         if (rval == FALSE) {
 222                 if (!g_signal_has_handler_pending(object, signals[sig], 0, FALSE))
 223                         return FALSE;
 224                 g_signal_emit(object, signals[sig], 0, event, &rval);
 225         }
 226
 227         if (rval == TRUE)
 228                 g_debug("GritsObject: breaking chained event");
 229         return rval;
 230 }
 231
 232 /* GObject stuff */
 233 G_DEFINE_ABSTRACT_TYPE(GritsObject, grits_object, G_TYPE_OBJECT);
 234 static void grits_object_init(GritsObject *object)
 235 {
 236         object->center.lat  =  0;
 237         object->center.lon  =  0;
 238         object->center.elev = -EARTH_R;
 239 }
 240
 241 static void grits_object_class_init(GritsObjectClass *klass)
 242 {
 243         GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
 244
 245         /**
 246          * GritsObject::enter:
 247          * @object: the object.
 248          *
 249          * The ::enter signal is emitted when the pointer moves over the object
 250          */
 251         signals[SIG_ENTER] = g_signal_new(
 252                         "enter",
 253                         G_TYPE_FROM_CLASS(gobject_class),
 254                         G_SIGNAL_RUN_LAST,
 255                         0,
 256                         NULL,
 257                         NULL,
 258                         grits_cclosure_marshal_BOOLEAN__POINTER,
 259                         G_TYPE_BOOLEAN,
 260                         1,
 261                         G_TYPE_POINTER);
 262
 263         /**
 264          * GritsViewer::leave:
 265          * @object: the object.
 266          *
 267          * The ::leave signal is emitted when the pointer moves away from the
 268          * object
 269          */
 270         signals[SIG_LEAVE] = g_signal_new(
 271                         "leave",
 272                         G_TYPE_FROM_CLASS(gobject_class),
 273                         G_SIGNAL_RUN_LAST,
 274                         0,
 275                         NULL,
 276                         NULL,
 277                         grits_cclosure_marshal_BOOLEAN__POINTER,
 278                         G_TYPE_BOOLEAN,
 279                         1,
 280                         G_TYPE_POINTER);
 281
 282         /**
 283          * GritsViewer::clicked:
 284          * @object: the object.
 285          *
 286          * The ::clicked signal is emitted when the user clicks on the object
 287          */
 288         signals[SIG_CLICKED] = g_signal_new(
 289                         "clicked",
 290                         G_TYPE_FROM_CLASS(gobject_class),
 291                         G_SIGNAL_RUN_LAST,
 292                         0,
 293                         NULL,
 294                         NULL,
 295                         grits_cclosure_marshal_BOOLEAN__POINTER,
 296                         G_TYPE_BOOLEAN,
 297                         1,
 298                         G_TYPE_POINTER);
 299
 300         /**
 301          * GritsViewer::button-press:
 302          * @object: the object.
 303          * @event:  the GdkEventButton which triggered this signal
 304          *
 305          * The ::button-press signal is emitted when a button (typically from a
 306          * mouse) is pressed.
 307          */
 308         signals[SIG_BUTTON_PRESS] = g_signal_new(
 309                         "button-press",
 310                         G_TYPE_FROM_CLASS(gobject_class),
 311                         G_SIGNAL_RUN_LAST,
 312                         0,
 313                         NULL,
 314                         NULL,
 315                         grits_cclosure_marshal_BOOLEAN__POINTER,
 316                         G_TYPE_BOOLEAN,
 317                         1,
 318                         G_TYPE_POINTER);
 319
 320         /**
 321          * GritsViewer::button-release:
 322          * @object: the object.
 323          * @event:  the GdkEventButton which triggered this signal
 324          *
 325          * The ::button-release signal is emitted when a button (typically from
 326          * a mouse) is released.
 327          */
 328         signals[SIG_BUTTON_RELEASE] = g_signal_new(
 329                         "button-release",
 330                         G_TYPE_FROM_CLASS(gobject_class),
 331                         G_SIGNAL_RUN_LAST,
 332                         0,
 333                         NULL,
 334                         NULL,
 335                         grits_cclosure_marshal_BOOLEAN__POINTER,
 336                         G_TYPE_BOOLEAN,
 337                         1,
 338                         G_TYPE_POINTER);
 339
 340         /**
 341          * GritsViewer::key-press:
 342          * @object: the object.
 343          * @event:  the GdkEventKey which triggered this signal
 344          *
 345          * The ::key-press signal is emitted when a key is pressed.
 346          */
 347         signals[SIG_KEY_PRESS] = g_signal_new(
 348                         "key-press",
 349                         G_TYPE_FROM_CLASS(gobject_class),
 350                         G_SIGNAL_RUN_LAST,
 351                         0,
 352                         NULL,
 353                         NULL,
 354                         grits_cclosure_marshal_BOOLEAN__POINTER,
 355                         G_TYPE_BOOLEAN,
 356                         1,
 357                         G_TYPE_POINTER);
 358
 359         /**
 360          * GritsViewer::key-release:
 361          * @object: the object.
 362          * @event:  the GdkEventKey which triggered this signal
 363          *
 364          * The ::key-release signal is emitted when a key is released.
 365          */
 366         signals[SIG_KEY_RELEASE] = g_signal_new(
 367                         "key-release",
 368                         G_TYPE_FROM_CLASS(gobject_class),
 369                         G_SIGNAL_RUN_LAST,
 370                         0,
 371                         NULL,
 372                         NULL,
 373                         grits_cclosure_marshal_BOOLEAN__POINTER,
 374                         G_TYPE_BOOLEAN,
 375                         1,
 376                         G_TYPE_POINTER);
 377
 378         /**
 379          * GritsViewer::motion:
 380          * @object: the object.
 381          * @event:  the GdkEventMotion which triggered this signal
 382          *
 383          * The ::motion signal is emitted the pointer moves over the object
 384          */
 385         signals[SIG_MOTION] = g_signal_new(
 386                         "motion",
 387                         G_TYPE_FROM_CLASS(gobject_class),
 388                         G_SIGNAL_RUN_LAST,
 389                         0,
 390                         NULL,
 391                         NULL,
 392                         grits_cclosure_marshal_BOOLEAN__POINTER,
 393                         G_TYPE_BOOLEAN,
 394                         1,
 395                         G_TYPE_POINTER);
 396 }