3dafba30de3559afa8ce45624be96c55a26ae65f
1 #define __PERSP3D_C__
3 /*
4 * Class modelling a 3D perspective as an SPObject
5 *
6 * Authors:
7 * Maximilian Albert <Anhalter42@gmx.de>
8 *
9 * Copyright (C) 2007 authors
10 *
11 * Released under GNU GPL, read the file 'COPYING' for more information
12 */
14 #include "persp3d.h"
15 #include "perspective-line.h"
16 #include "attributes.h"
17 #include "document-private.h"
18 #include "vanishing-point.h"
19 #include "box3d-context.h"
20 #include "box3d.h"
21 #include "xml/document.h"
22 #include "xml/node-event-vector.h"
23 #include "desktop-handles.h"
24 #include <glibmm/i18n.h>
26 static void persp3d_class_init(Persp3DClass *klass);
27 static void persp3d_init(Persp3D *stop);
29 static void persp3d_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
30 static void persp3d_release(SPObject *object);
31 static void persp3d_set(SPObject *object, unsigned key, gchar const *value);
32 static void persp3d_update(SPObject *object, SPCtx *ctx, guint flags);
33 static Inkscape::XML::Node *persp3d_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
35 static void persp3d_on_repr_attr_changed (Inkscape::XML::Node * repr, const gchar *key, const gchar *oldval, const gchar *newval, bool is_interactive, void * data);
37 static SPObjectClass *persp3d_parent_class;
39 static int global_counter = 0;
41 /**
42 * Registers Persp3d class and returns its type.
43 */
44 GType
45 persp3d_get_type()
46 {
47 static GType type = 0;
48 if (!type) {
49 GTypeInfo info = {
50 sizeof(Persp3DClass),
51 NULL, NULL,
52 (GClassInitFunc) persp3d_class_init,
53 NULL, NULL,
54 sizeof(Persp3D),
55 16,
56 (GInstanceInitFunc) persp3d_init,
57 NULL, /* value_table */
58 };
59 type = g_type_register_static(SP_TYPE_OBJECT, "Persp3D", &info, (GTypeFlags)0);
60 }
61 return type;
62 }
64 static Inkscape::XML::NodeEventVector const persp3d_repr_events = {
65 NULL, /* child_added */
66 NULL, /* child_removed */
67 persp3d_on_repr_attr_changed,
68 NULL, /* content_changed */
69 NULL /* order_changed */
70 };
72 /**
73 * Callback to initialize Persp3D vtable.
74 */
75 static void persp3d_class_init(Persp3DClass *klass)
76 {
77 SPObjectClass *sp_object_class = (SPObjectClass *) klass;
79 persp3d_parent_class = (SPObjectClass *) g_type_class_ref(SP_TYPE_OBJECT);
81 sp_object_class->build = persp3d_build;
82 sp_object_class->release = persp3d_release;
83 sp_object_class->set = persp3d_set;
84 sp_object_class->update = persp3d_update;
85 sp_object_class->write = persp3d_write;
86 }
88 /**
89 * Callback to initialize Persp3D object.
90 */
91 static void
92 persp3d_init(Persp3D *persp)
93 {
94 persp->tmat = Proj::TransfMat3x4 ();
96 //persp->boxes = NULL;
97 persp->document = NULL;
99 persp->my_counter = global_counter++;
100 }
102 /**
103 * Virtual build: set persp3d attributes from its associated XML node.
104 */
105 static void persp3d_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
106 {
107 if (((SPObjectClass *) persp3d_parent_class)->build)
108 (* ((SPObjectClass *) persp3d_parent_class)->build)(object, document, repr);
110 /* calls sp_object_set for the respective attributes */
111 // The transformation matrix is updated according to the values we read for the VPs
112 sp_object_read_attr(object, "inkscape:vp_x");
113 sp_object_read_attr(object, "inkscape:vp_y");
114 sp_object_read_attr(object, "inkscape:vp_z");
115 sp_object_read_attr(object, "inkscape:persp3d-origin");
117 if (repr) {
118 repr->addListener (&persp3d_repr_events, object);
119 }
121 // FIXME: What precisely does this do and is it necessary for perspectives?
122 /* Register ourselves */
123 //sp_document_add_resource(document, "persp3d", object);
124 }
126 /**
127 * Virtual release of Persp3D members before destruction.
128 */
129 static void persp3d_release(SPObject *object) {
130 //Persp3D *persp = (Persp3D *) object;
132 // FIXME: What precisely does this do and is it necessary for perspectives?
133 /**
134 if (SP_OBJECT_DOCUMENT(object)) {
135 // Unregister ourselves
136 sp_document_remove_resource(SP_OBJECT_DOCUMENT(object), "persp3d", SP_OBJECT(object));
137 }
138 **/
139 }
142 /**
143 * Virtual set: set attribute to value.
144 */
145 // FIXME: Currently we only read the finite positions of vanishing points;
146 // should we move VPs into their own repr (as it's done for SPStop, e.g.)?
147 static void
148 persp3d_set(SPObject *object, unsigned key, gchar const *value)
149 {
150 Persp3D *persp = SP_PERSP3D (object);
152 switch (key) {
153 case SP_ATTR_INKSCAPE_PERSP3D_VP_X: {
154 if (value) {
155 Proj::Pt2 new_image (value);
156 persp3d_update_with_point (persp, Proj::X, new_image);
157 }
158 break;
159 }
160 case SP_ATTR_INKSCAPE_PERSP3D_VP_Y: {
161 if (value) {
162 Proj::Pt2 new_image (value);
163 persp3d_update_with_point (persp, Proj::Y, new_image);
164 break;
165 }
166 }
167 case SP_ATTR_INKSCAPE_PERSP3D_VP_Z: {
168 if (value) {
169 Proj::Pt2 new_image (value);
170 persp3d_update_with_point (persp, Proj::Z, new_image);
171 break;
172 }
173 }
174 case SP_ATTR_INKSCAPE_PERSP3D_ORIGIN: {
175 if (value) {
176 Proj::Pt2 new_image (value);
177 persp3d_update_with_point (persp, Proj::W, new_image);
178 break;
179 }
180 }
181 default: {
182 if (((SPObjectClass *) persp3d_parent_class)->set)
183 (* ((SPObjectClass *) persp3d_parent_class)->set)(object, key, value);
184 break;
185 }
186 }
188 // FIXME: Is this the right place for resetting the draggers?
189 SPEventContext *ec = inkscape_active_event_context();
190 if (SP_IS_BOX3D_CONTEXT(ec)) {
191 Box3DContext *bc = SP_BOX3D_CONTEXT(ec);
192 bc->_vpdrag->updateDraggers();
193 bc->_vpdrag->updateLines();
194 bc->_vpdrag->updateBoxHandles();
195 bc->_vpdrag->updateBoxReprs();
196 }
197 }
199 static void
200 persp3d_update(SPObject *object, SPCtx *ctx, guint flags)
201 {
202 if (flags & SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG) {
204 /* TODO: Should we update anything here? */
206 }
208 if (((SPObjectClass *) persp3d_parent_class)->update)
209 ((SPObjectClass *) persp3d_parent_class)->update(object, ctx, flags);
210 }
212 Persp3D *
213 persp3d_create_xml_element (SPDocument *document, Persp3D *dup) {// if dup is given, copy the attributes over
214 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
215 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
216 Inkscape::XML::Node *repr;
217 if (dup) {
218 repr = SP_OBJECT_REPR(dup)->duplicate (xml_doc);
219 } else {
220 repr = xml_doc->createElement("inkscape:perspective");
221 repr->setAttribute("sodipodi:type", "inkscape:persp3d");
222 }
224 /* Append the new persp3d to defs */
225 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
226 Inkscape::GC::release(repr);
228 return (Persp3D *) sp_object_get_child_by_repr (SP_OBJECT(defs), repr);
229 }
231 /**
232 * Virtual write: write object attributes to repr.
233 */
234 static Inkscape::XML::Node *
235 persp3d_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
236 {
237 SPDocument *document = SP_OBJECT_DOCUMENT(object);
238 Persp3D *persp = SP_PERSP3D(object);
240 if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
241 repr = SP_OBJECT_REPR(persp3d_create_xml_element (document));
242 }
244 if (flags & SP_OBJECT_WRITE_EXT) {
245 gchar *str = NULL; // FIXME: Should this be freed each time we set an attribute or only in the end or at all?
246 str = persp3d_pt_to_str (persp, Proj::X);
247 repr->setAttribute("inkscape:vp_x", str);
249 str = persp3d_pt_to_str (persp, Proj::Y);
250 repr->setAttribute("inkscape:vp_y", str);
252 str = persp3d_pt_to_str (persp, Proj::Z);
253 repr->setAttribute("inkscape:vp_z", str);
255 str = persp3d_pt_to_str (persp, Proj::W);
256 repr->setAttribute("inkscape:persp3d-origin", str);
257 }
259 if (((SPObjectClass *) persp3d_parent_class)->write)
260 (* ((SPObjectClass *) persp3d_parent_class)->write)(object, repr, flags);
262 return repr;
263 }
265 /* convenience wrapper around persp3d_get_finite_dir() and persp3d_get_infinite_dir() */
266 NR::Point persp3d_get_PL_dir_from_pt (Persp3D *persp, NR::Point const &pt, Proj::Axis axis) {
267 if (persp3d_VP_is_finite(persp, axis)) {
268 return persp3d_get_finite_dir(persp, pt, axis);
269 } else {
270 return persp3d_get_infinite_dir(persp, axis);
271 }
272 }
274 NR::Point
275 persp3d_get_finite_dir (Persp3D *persp, NR::Point const &pt, Proj::Axis axis) {
276 Box3D::PerspectiveLine pl(pt, axis, persp);
277 return pl.direction();
278 }
280 NR::Point
281 persp3d_get_infinite_dir (Persp3D *persp, Proj::Axis axis) {
282 Proj::Pt2 vp(persp3d_get_VP(persp, axis));
283 if (vp[2] != 0.0) {
284 g_print ("VP should be infinite but is (%f : %f : %f)\n", vp[0], vp[1], vp[2]);
285 g_return_val_if_fail(vp[2] != 0.0, NR::Point(0.0, 0.0));
286 }
287 return NR::Point(vp[0], vp[1]);
288 }
290 double
291 persp3d_get_infinite_angle (Persp3D *persp, Proj::Axis axis) {
292 return persp->tmat.get_infinite_angle(axis);
293 }
295 bool
296 persp3d_VP_is_finite (Persp3D *persp, Proj::Axis axis) {
297 return persp->tmat.has_finite_image(axis);
298 }
300 void
301 persp3d_toggle_VP (Persp3D *persp, Proj::Axis axis, bool set_undo) {
302 persp->tmat.toggle_finite(axis);
303 // FIXME: Remove this repr update and rely on vp_drag_sel_modified() to do this for us
304 // On the other hand, vp_drag_sel_modified() would update all boxes;
305 // here we can confine ourselves to the boxes of this particular perspective.
306 persp3d_update_box_reprs (persp);
307 persp3d_update_z_orders (persp);
308 SP_OBJECT(persp)->updateRepr(SP_OBJECT_WRITE_EXT);
309 if (set_undo) {
310 sp_document_done(sp_desktop_document(inkscape_active_desktop()), SP_VERB_CONTEXT_3DBOX,
311 _("Toggle vanishing point"));
312 }
313 }
315 /* toggle VPs for the same axis in all perspectives of a given list */
316 void
317 persp3d_toggle_VPs (std::set<Persp3D *> p, Proj::Axis axis) {
318 for (std::set<Persp3D *>::iterator i = p.begin(); i != p.end(); ++i) {
319 persp3d_toggle_VP((*i), axis, false);
320 }
321 sp_document_done(sp_desktop_document(inkscape_active_desktop()), SP_VERB_CONTEXT_3DBOX,
322 _("Toggle multiple vanishing points"));
323 }
325 void
326 persp3d_set_VP_state (Persp3D *persp, Proj::Axis axis, Proj::VPState state) {
327 if (persp3d_VP_is_finite(persp, axis) != (state == Proj::FINITE)) {
328 persp3d_toggle_VP(persp, axis);
329 }
330 }
332 void
333 persp3d_rotate_VP (Persp3D *persp, Proj::Axis axis, double angle, bool alt_pressed) { // angle is in degrees
334 // FIXME: Most of this functionality should be moved to trans_mat_3x4.(h|cpp)
335 if (persp->tmat.has_finite_image(axis)) {
336 // don't rotate anything for finite VPs
337 return;
338 }
339 Proj::Pt2 v_dir_proj (persp->tmat.column(axis));
340 NR::Point v_dir (v_dir_proj[0], v_dir_proj[1]);
341 double a = NR::atan2 (v_dir) * 180/M_PI;
342 a += alt_pressed ? 0.5 * ((angle > 0 ) - (angle < 0)) : angle; // the r.h.s. yields +/-0.5 or angle
343 persp->tmat.set_infinite_direction (axis, a);
345 persp3d_update_box_reprs (persp);
346 persp3d_update_z_orders (persp);
347 SP_OBJECT(persp)->updateRepr(SP_OBJECT_WRITE_EXT);
348 }
350 void
351 persp3d_update_with_point (Persp3D *persp, Proj::Axis const axis, Proj::Pt2 const &new_image) {
352 persp->tmat.set_image_pt (axis, new_image);
353 }
355 void
356 persp3d_apply_affine_transformation (Persp3D *persp, NR::Matrix const &xform) {
357 persp->tmat *= xform;
358 persp3d_update_box_reprs(persp);
359 }
361 gchar *
362 persp3d_pt_to_str (Persp3D *persp, Proj::Axis const axis)
363 {
364 return persp->tmat.pt_to_str(axis);
365 }
367 void
368 persp3d_add_box (Persp3D *persp, SPBox3D *box) {
369 if (!box) {
370 //g_warning ("Trying to add NULL box to perspective.\n");
371 return;
372 }
373 if (std::find (persp->boxes.begin(), persp->boxes.end(), box) != persp->boxes.end()) {
374 //g_warning ("Attempting to add already existent box to perspective.\n");
375 return;
376 }
377 persp->boxes.push_back(box);
378 //SP_OBJECT_REPR(box)->setAttribute("inkscape:perspectiveID", SP_OBJECT_REPR(persp)->attribute("id"));
379 }
381 void
382 persp3d_remove_box (Persp3D *persp, SPBox3D *box) {
383 std::vector<SPBox3D *>::iterator i = std::find (persp->boxes.begin(), persp->boxes.end(), box);
384 if (i != persp->boxes.end()) {
385 persp->boxes.erase(i);
386 }
387 }
389 bool
390 persp3d_has_box (Persp3D *persp, SPBox3D *box) {
391 // FIXME: For some reason, std::find() does not seem to compare pointers "correctly" (or do we need to
392 // provide a proper comparison function?), so we manually traverse the list.
393 for (std::vector<SPBox3D *>::iterator i = persp->boxes.begin(); i != persp->boxes.end(); ++i) {
394 if ((*i) == box) {
395 return true;
396 }
397 }
398 return false;
399 }
401 void
402 persp3d_update_box_displays (Persp3D *persp) {
403 if (persp->boxes.empty())
404 return;
405 //g_print ("Requesting display update for %d boxes in the perspective.\n", persp->boxes.size());
406 for (std::vector<SPBox3D *>::iterator i = persp->boxes.begin(); i != persp->boxes.end(); ++i) {
407 box3d_position_set(*i);
408 }
409 }
411 void
412 persp3d_update_box_reprs (Persp3D *persp) {
413 if (persp->boxes.empty())
414 return;
415 //g_print ("Requesting repr update for %d boxes in the perspective.\n", persp->boxes.size());
416 for (std::vector<SPBox3D *>::iterator i = persp->boxes.begin(); i != persp->boxes.end(); ++i) {
417 SP_OBJECT(*i)->updateRepr(SP_OBJECT_WRITE_EXT);
418 }
419 }
421 void
422 persp3d_update_z_orders (Persp3D *persp) {
423 if (persp->boxes.empty())
424 return;
425 for (std::vector<SPBox3D *>::iterator i = persp->boxes.begin(); i != persp->boxes.end(); ++i) {
426 box3d_set_z_orders(*i);
427 }
428 }
430 // FIXME: For some reason we seem to require a vector instead of a list in Persp3D, but in vp_knot_moved_handler()
431 // we need a list of boxes. If we can store a list in Persp3D right from the start, this function becomes
432 // obsolete. We should do this.
433 std::list<SPBox3D *>
434 persp3d_list_of_boxes(Persp3D *persp) {
435 std::list<SPBox3D *> bx_lst;
436 for (std::vector<SPBox3D *>::iterator i = persp->boxes.begin(); i != persp->boxes.end(); ++i) {
437 bx_lst.push_back(*i);
438 }
439 return bx_lst;
440 }
442 bool
443 persp3d_perspectives_coincide(const Persp3D *lhs, const Persp3D *rhs)
444 {
445 return lhs->tmat == rhs->tmat;
446 }
448 void
449 persp3d_absorb(Persp3D *persp1, Persp3D *persp2) {
450 /* double check if we are called in sane situations */
451 g_return_if_fail (persp3d_perspectives_coincide(persp1, persp2) && persp1 != persp2);
453 std::vector<SPBox3D *>::iterator boxes;
455 // Note: We first need to copy the boxes of persp2 into a separate list;
456 // otherwise the loop below gets confused when perspectives are reattached.
457 std::list<SPBox3D *> boxes_of_persp2 = persp3d_list_of_boxes(persp2);
459 Inkscape::XML::Node *persp_repr = SP_OBJECT_REPR(persp1);
460 const gchar *persp_id = persp_repr->attribute("id");
461 gchar *href = g_strdup_printf("#%s", persp_id);
463 for (std::list<SPBox3D *>::iterator i = boxes_of_persp2.begin(); i != boxes_of_persp2.end(); ++i) {
464 SP_OBJECT_REPR(*i)->setAttribute("inkscape:perspectiveID", href);
465 }
466 g_free(href);
468 persp1->boxes.insert(persp1->boxes.begin(), persp2->boxes.begin(), persp2->boxes.end());
469 }
471 static void
472 persp3d_on_repr_attr_changed ( Inkscape::XML::Node * repr,
473 const gchar *key,
474 const gchar *oldval,
475 const gchar *newval,
476 bool is_interactive,
477 void * data )
478 {
479 //g_print("persp3d_on_repr_attr_changed!!!! TODO: Do we need to trigger any further updates than the box reprs?");
481 if (!data)
482 return;
484 Persp3D *persp = (Persp3D*) data;
485 persp3d_update_box_displays (persp);
487 //lpeobj->requestModified(SP_OBJECT_MODIFIED_FLAG);
488 }
490 /* returns a std::set() of all perspectives of the currently selected boxes */
491 std::set<Persp3D *>
492 persp3d_currently_selected (Box3DContext *bc) {
493 Inkscape::Selection *selection = sp_desktop_selection (bc->desktop);
495 std::set<Persp3D *> p;
496 for (GSList *i = (GSList *) selection->itemList(); i != NULL; i = i->next) {
497 if (SP_IS_BOX3D (i->data)) {
498 p.insert(SP_BOX3D(i->data)->persp_ref->getObject());
499 }
500 }
501 return p;
502 }
504 void
505 persp3d_print_debugging_info (Persp3D *persp) {
506 g_print ("=== Info for Persp3D %d ===\n", persp->my_counter);
507 gchar * cstr;
508 for (int i = 0; i < 4; ++i) {
509 cstr = persp3d_get_VP(persp, Proj::axes[i]).coord_string();
510 g_print (" VP %s: %s\n", Proj::string_from_axis(Proj::axes[i]), cstr);
511 g_free(cstr);
512 }
513 cstr = persp3d_get_VP(persp, Proj::W).coord_string();
514 g_print (" Origin: %s\n", cstr);
515 g_free(cstr);
517 g_print (" Boxes: ");
518 for (std::vector<SPBox3D *>::iterator i = persp->boxes.begin(); i != persp->boxes.end(); ++i) {
519 g_print ("%d (%d)", (*i)->my_counter, (*i)->persp_ref->getObject()->my_counter);
520 }
521 g_print ("\n");
522 g_print ("========================\n");
523 }
525 void
526 persp3d_print_debugging_info_all(SPDocument *document) {
527 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
528 Inkscape::XML::Node *repr;
529 for (SPObject *child = sp_object_first_child(defs); child != NULL; child = SP_OBJECT_NEXT(child) ) {
530 repr = SP_OBJECT_REPR(child);
531 if (SP_IS_PERSP3D(child)) {
532 persp3d_print_debugging_info(SP_PERSP3D(child));
533 }
534 }
535 }
537 /*
538 Local Variables:
539 mode:c++
540 c-file-style:"stroustrup"
541 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
542 indent-tabs-mode:nil
543 fill-column:99
544 End:
545 */
546 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :