1 #define __SP_BOX3D_C__
3 /*
4 * SVG <box3d> implementation
5 *
6 * Authors:
7 * Maximilian Albert <Anhalter42@gmx.de>
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 * bulia byak <buliabyak@users.sf.net>
10 *
11 * Copyright (C) 2007 Authors
12 * Copyright (C) 1999-2002 Lauris Kaplinski
13 * Copyright (C) 2000-2001 Ximian, Inc.
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
18 #include <glibmm/i18n.h>
19 #include "attributes.h"
20 #include "xml/document.h"
21 #include "xml/repr.h"
23 #include "box3d.h"
24 #include "box3d-side.h"
25 #include "box3d-context.h"
26 #include "proj_pt.h"
27 #include "transf_mat_3x4.h"
28 #include "perspective-line.h"
29 #include "inkscape.h"
30 #include "persp3d.h"
31 #include "line-geometry.h"
32 #include "persp3d-reference.h"
33 #include "uri.h"
34 #include "2geom/geom.h"
35 #include "sp-guide.h"
36 #include "sp-namedview.h"
37 #include "prefs-utils.h"
39 #include "desktop.h"
40 #include "macros.h"
42 static void box3d_class_init(SPBox3DClass *klass);
43 static void box3d_init(SPBox3D *box3d);
45 static void box3d_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
46 static void box3d_release(SPObject *object);
47 static void box3d_set(SPObject *object, unsigned int key, const gchar *value);
48 static void box3d_update(SPObject *object, SPCtx *ctx, guint flags);
49 static Inkscape::XML::Node *box3d_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
51 static gchar *box3d_description(SPItem *item);
52 static NR::Matrix box3d_set_transform(SPItem *item, NR::Matrix const &xform);
54 static void box3d_ref_changed(SPObject *old_ref, SPObject *ref, SPBox3D *box);
55 static void box3d_ref_modified(SPObject *href, guint flags, SPBox3D *box);
56 //static void box3d_ref_changed(SPObject *old_ref, SPObject *ref, Persp3D *persp);
57 //static void box3d_ref_modified(SPObject *href, guint flags, Persp3D *persp);
59 static SPGroupClass *parent_class;
61 static gint counter = 0;
63 GType
64 box3d_get_type(void)
65 {
66 static GType type = 0;
68 if (!type) {
69 GTypeInfo info = {
70 sizeof(SPBox3DClass),
71 NULL, /* base_init */
72 NULL, /* base_finalize */
73 (GClassInitFunc) box3d_class_init,
74 NULL, /* class_finalize */
75 NULL, /* class_data */
76 sizeof(SPBox3D),
77 16, /* n_preallocs */
78 (GInstanceInitFunc) box3d_init,
79 NULL, /* value_table */
80 };
81 type = g_type_register_static(SP_TYPE_GROUP, "SPBox3D", &info, (GTypeFlags) 0);
82 }
84 return type;
85 }
87 static void
88 box3d_class_init(SPBox3DClass *klass)
89 {
90 SPObjectClass *sp_object_class = (SPObjectClass *) klass;
91 SPItemClass *item_class = (SPItemClass *) klass;
93 parent_class = (SPGroupClass *) g_type_class_ref(SP_TYPE_GROUP);
95 sp_object_class->build = box3d_build;
96 sp_object_class->release = box3d_release;
97 sp_object_class->set = box3d_set;
98 sp_object_class->write = box3d_write;
99 sp_object_class->update = box3d_update;
101 item_class->description = box3d_description;
102 item_class->set_transform = box3d_set_transform;
103 }
105 static void
106 box3d_init(SPBox3D *box)
107 {
108 box->persp_href = NULL;
109 box->persp_ref = new Persp3DReference(SP_OBJECT(box));
110 new (&box->modified_connection) sigc::connection();
111 }
113 static void
114 box3d_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
115 {
116 if (((SPObjectClass *) (parent_class))->build) {
117 ((SPObjectClass *) (parent_class))->build(object, document, repr);
118 }
120 SPBox3D *box = SP_BOX3D (object);
121 box->my_counter = counter++;
123 /* we initialize the z-orders to zero so that they are updated during dragging */
124 for (int i = 0; i < 6; ++i) {
125 box->z_orders[i] = 0;
126 }
128 // TODO: Create/link to the correct perspective
130 SPDocument *doc = SP_OBJECT_DOCUMENT(box);
131 if (!doc) {
132 g_print ("No document for the box!!!!\n");
133 return;
134 }
135 /**
136 if (!box->persp3d) {
137 g_print ("Box seems to be newly created since no perspective is referenced yet. We reference the current perspective.\n");
138 box->persp3d = doc->current_persp3d;
139 }
140 **/
142 box->persp_ref->changedSignal().connect(sigc::bind(sigc::ptr_fun(box3d_ref_changed), box));
144 sp_object_read_attr(object, "inkscape:perspectiveID");
145 sp_object_read_attr(object, "inkscape:corner0");
146 sp_object_read_attr(object, "inkscape:corner7");
147 }
149 /**
150 * Virtual release of SPBox3D members before destruction.
151 */
152 static void
153 box3d_release(SPObject *object)
154 {
155 SPBox3D *box = (SPBox3D *) object;
157 if (box->persp_href) {
158 g_free(box->persp_href);
159 }
160 if (box->persp_ref) {
161 box->persp_ref->detach();
162 delete box->persp_ref;
163 box->persp_ref = NULL;
164 }
166 box->modified_connection.disconnect();
167 box->modified_connection.~connection();
169 //persp3d_remove_box (box3d_get_perspective(box), box);
171 if (((SPObjectClass *) parent_class)->release)
172 ((SPObjectClass *) parent_class)->release(object);
173 }
175 static void
176 box3d_set(SPObject *object, unsigned int key, const gchar *value)
177 {
178 SPBox3D *box = SP_BOX3D(object);
180 switch (key) {
181 case SP_ATTR_INKSCAPE_BOX3D_PERSPECTIVE_ID:
182 if ( value && box->persp_href && ( strcmp(value, box->persp_href) == 0 ) ) {
183 /* No change, do nothing. */
184 } else {
185 if (box->persp_href) {
186 g_free(box->persp_href);
187 box->persp_href = NULL;
188 }
189 if (value) {
190 box->persp_href = g_strdup(value);
192 // Now do the attaching, which emits the changed signal.
193 try {
194 box->persp_ref->attach(Inkscape::URI(value));
195 } catch (Inkscape::BadURIException &e) {
196 g_warning("%s", e.what());
197 box->persp_ref->detach();
198 }
199 } else {
200 // Detach, which emits the changed signal.
201 box->persp_ref->detach();
202 // TODO: Clean this up (also w.r.t the surrounding if construct)
203 /***
204 g_print ("No perspective given. Attaching to current perspective instead.\n");
205 g_free(box->persp_href);
206 Inkscape::XML::Node *repr = SP_OBJECT_REPR(inkscape_active_document()->current_persp3d);
207 box->persp_href = g_strdup(repr->attribute("id"));
208 box->persp_ref->attach(Inkscape::URI(box->persp_href));
209 ***/
210 }
211 }
213 // FIXME: Is the following update doubled by some call in either persp3d.cpp or vanishing_point_new.cpp?
214 box3d_position_set(box);
215 break;
216 case SP_ATTR_INKSCAPE_BOX3D_CORNER0:
217 if (value && strcmp(value, "0 : 0 : 0 : 0")) {
218 box->orig_corner0 = Proj::Pt3(value);
219 box->save_corner0 = box->orig_corner0;
220 box3d_position_set(box);
221 }
222 break;
223 case SP_ATTR_INKSCAPE_BOX3D_CORNER7:
224 if (value && strcmp(value, "0 : 0 : 0 : 0")) {
225 box->orig_corner7 = Proj::Pt3(value);
226 box->save_corner7 = box->orig_corner7;
227 box3d_position_set(box);
228 }
229 break;
230 default:
231 if (((SPObjectClass *) (parent_class))->set) {
232 ((SPObjectClass *) (parent_class))->set(object, key, value);
233 }
234 break;
235 }
236 //object->updateRepr(); // This ensures correct update of the box after undo/redo. FIXME: Why is this not present in sp-rect.cpp and similar files?
237 }
239 /**
240 * Gets called when (re)attached to another perspective.
241 */
242 static void
243 box3d_ref_changed(SPObject *old_ref, SPObject *ref, SPBox3D *box)
244 {
245 if (old_ref) {
246 sp_signal_disconnect_by_data(old_ref, box);
247 persp3d_remove_box (SP_PERSP3D(old_ref), box);
248 /* Note: This sometimes leads to attempts to remove boxes twice from the list of selected/transformed
249 boxes in a perspectives, but this should be uncritical. */
250 persp3d_remove_box_transform (SP_PERSP3D(old_ref), box);
251 }
252 if ( SP_IS_PERSP3D(ref) && ref != box ) // FIXME: Comparisons sane?
253 {
254 box->modified_connection.disconnect();
255 box->modified_connection = ref->connectModified(sigc::bind(sigc::ptr_fun(&box3d_ref_modified), box));
256 box3d_ref_modified(ref, 0, box);
257 persp3d_add_box (SP_PERSP3D(ref), box);
258 /* Note: This sometimes leads to attempts to add boxes twice to the list of selected/transformed
259 boxes in a perspectives, but this should be uncritical. */
260 persp3d_add_box_transform (SP_PERSP3D(ref), box);
261 }
262 }
264 static void
265 box3d_update(SPObject *object, SPCtx *ctx, guint flags)
266 {
267 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
269 /* FIXME?: Perhaps the display updates of box sides should be instantiated from here, but this
270 causes evil update loops so it's all done from box3d_position_set, which is called from
271 various other places (like the handlers in object-edit.cpp, vanishing-point.cpp, etc. */
273 }
275 // Invoke parent method
276 if (((SPObjectClass *) (parent_class))->update)
277 ((SPObjectClass *) (parent_class))->update(object, ctx, flags);
278 }
281 static Inkscape::XML::Node *box3d_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
282 {
283 SPBox3D *box = SP_BOX3D(object);
285 if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
286 // this is where we end up when saving as plain SVG (also in other circumstances?)
287 // thus we don' set "sodipodi:type" so that the box is only saved as an ordinary svg:g
288 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_OBJECT_DOCUMENT(object));
289 repr = xml_doc->createElement("svg:g");
290 }
292 if (flags & SP_OBJECT_WRITE_EXT) {
294 if (box->persp_href) {
295 repr->setAttribute("inkscape:perspectiveID", box->persp_href);
296 } else {
297 /* box is not yet linked to a perspective; use the document's current perspective */
298 SPDocument *doc = inkscape_active_document();
299 if (box->persp_ref->getURI()) {
300 gchar *uri_string = box->persp_ref->getURI()->toString();
301 repr->setAttribute("inkscape:perspectiveID", uri_string);
302 g_free(uri_string);
303 } else if (doc) {
304 //persp3d_add_box (doc->current_persp3d, box);
305 Inkscape::XML::Node *persp_repr = SP_OBJECT_REPR(doc->current_persp3d);
306 const gchar *persp_id = persp_repr->attribute("id");
307 gchar *href = g_strdup_printf("#%s", persp_id);
308 repr->setAttribute("inkscape:perspectiveID", href);
309 g_free(href);
310 } else {
311 g_print ("No active document while creating perspective!!!\n");
312 }
313 }
315 gchar *coordstr0 = box->orig_corner0.coord_string();
316 gchar *coordstr7 = box->orig_corner7.coord_string();
317 repr->setAttribute("inkscape:corner0", coordstr0);
318 repr->setAttribute("inkscape:corner7", coordstr7);
319 g_free(coordstr0);
320 g_free(coordstr7);
322 box->orig_corner0.normalize();
323 box->orig_corner7.normalize();
325 box->save_corner0 = box->orig_corner0;
326 box->save_corner7 = box->orig_corner7;
327 }
329 if (((SPObjectClass *) (parent_class))->write) {
330 ((SPObjectClass *) (parent_class))->write(object, repr, flags);
331 }
333 return repr;
334 }
336 static gchar *
337 box3d_description(SPItem *item)
338 {
339 g_return_val_if_fail(SP_IS_BOX3D(item), NULL);
341 return g_strdup(_("<b>3D Box</b>"));
342 }
344 void
345 box3d_position_set (SPBox3D *box)
346 {
347 /* This draws the curve and calls requestDisplayUpdate() for each side (the latter is done in
348 box3d_side_position_set() to avoid update conflicts with the parent box) */
349 for (SPObject *child = sp_object_first_child(SP_OBJECT (box)); child != NULL; child = SP_OBJECT_NEXT(child) ) {
350 box3d_side_position_set (SP_BOX3D_SIDE (child));
351 }
352 }
354 static NR::Matrix
355 box3d_set_transform(SPItem *item, NR::Matrix const &xform)
356 {
357 SPBox3D *box = SP_BOX3D(item);
359 /* check whether we need to unlink any boxes from their perspectives */
360 Persp3D *persp = box3d_get_perspective(box);
361 Persp3D *transf_persp;
363 if (!persp3d_has_all_boxes_in_selection (persp)) {
364 std::list<SPBox3D *> sel = persp3d_selected_boxes (persp);
366 /* create a new perspective as a copy of the current one and link the selected boxes to it */
367 transf_persp = persp3d_create_xml_element (SP_OBJECT_DOCUMENT(persp), persp);
369 for (std::list<SPBox3D *>::iterator b = sel.begin(); b != sel.end(); ++b) {
370 box3d_switch_perspectives(*b, persp, transf_persp);
371 }
372 } else {
373 transf_persp = persp;
374 }
376 /* only transform the perspective once, even if it has several selected boxes */
377 if(!persp3d_was_transformed (transf_persp)) {
378 /* concatenate the affine transformation with the perspective mapping; this
379 function also triggers repr updates of boxes and the perspective itself */
380 persp3d_apply_affine_transformation(transf_persp, xform);
381 }
383 box3d_mark_transformed(box);
385 if (persp3d_all_transformed(transf_persp)) {
386 /* all boxes were transformed; make perspective sensitive for further transformations */
387 persp3d_unset_transforms(transf_persp);
388 }
390 NR::Matrix ret(NR::transform(xform));
391 gdouble const sw = hypot(ret[0], ret[1]);
392 gdouble const sh = hypot(ret[2], ret[3]);
394 SPItem *sideitem = NULL;
395 for (SPObject *side = sp_object_first_child(box); side != NULL; side = SP_OBJECT_NEXT(side)) {
396 sideitem = SP_ITEM(side);
398 // Adjust stroke width
399 sp_item_adjust_stroke(sideitem, sqrt(fabs(sw * sh)));
401 // Adjust pattern fill
402 sp_item_adjust_pattern(sideitem, xform);
404 // Adjust gradient fill
405 sp_item_adjust_gradient(sideitem, xform);
407 // Adjust LPE
408 sp_item_adjust_livepatheffect(item, xform);
409 }
411 return NR::identity();
412 }
415 /**
416 * Gets called when persp(?) repr contents change: i.e. parameter change.
417 */
418 static void
419 box3d_ref_modified(SPObject */*href*/, guint /*flags*/, SPBox3D */*box*/)
420 {
421 /***
422 g_print ("FIXME: box3d_ref_modified was called. What should we do?\n");
423 g_print ("Here is at least the the href's id: %s\n", SP_OBJECT_REPR(href)->attribute("id"));
424 g_print (" ... and the box's, too: %s\n", SP_OBJECT_REPR(box)->attribute("id"));
425 ***/
427 }
429 Proj::Pt3
430 box3d_get_proj_corner (guint id, Proj::Pt3 const &c0, Proj::Pt3 const &c7) {
431 return Proj::Pt3 ((id & Box3D::X) ? c7[Proj::X] : c0[Proj::X],
432 (id & Box3D::Y) ? c7[Proj::Y] : c0[Proj::Y],
433 (id & Box3D::Z) ? c7[Proj::Z] : c0[Proj::Z],
434 1.0);
435 }
437 Proj::Pt3
438 box3d_get_proj_corner (SPBox3D const *box, guint id) {
439 return Proj::Pt3 ((id & Box3D::X) ? box->orig_corner7[Proj::X] : box->orig_corner0[Proj::X],
440 (id & Box3D::Y) ? box->orig_corner7[Proj::Y] : box->orig_corner0[Proj::Y],
441 (id & Box3D::Z) ? box->orig_corner7[Proj::Z] : box->orig_corner0[Proj::Z],
442 1.0);
443 }
445 NR::Point
446 box3d_get_corner_screen (SPBox3D const *box, guint id) {
447 Proj::Pt3 proj_corner (box3d_get_proj_corner (box, id));
448 if (!box3d_get_perspective(box)) {
449 //g_print ("No perspective present in box!! Should we simply use the currently active perspective?\n");
450 return NR::Point (NR_HUGE, NR_HUGE);
451 }
452 return box3d_get_perspective(box)->tmat.image(proj_corner).affine();
453 }
455 Proj::Pt3
456 box3d_get_proj_center (SPBox3D *box) {
457 box->orig_corner0.normalize();
458 box->orig_corner7.normalize();
459 return Proj::Pt3 ((box->orig_corner0[Proj::X] + box->orig_corner7[Proj::X]) / 2,
460 (box->orig_corner0[Proj::Y] + box->orig_corner7[Proj::Y]) / 2,
461 (box->orig_corner0[Proj::Z] + box->orig_corner7[Proj::Z]) / 2,
462 1.0);
463 }
465 NR::Point
466 box3d_get_center_screen (SPBox3D *box) {
467 Proj::Pt3 proj_center (box3d_get_proj_center (box));
468 if (!box3d_get_perspective(box)) {
469 //g_print ("No perspective present in box!! Should we simply use the currently active perspective?\n");
470 return NR::Point (NR_HUGE, NR_HUGE);
471 }
472 return box3d_get_perspective(box)->tmat.image(proj_center).affine();
473 }
475 /*
476 * To keep the snappoint from jumping randomly between the two lines when the mouse pointer is close to
477 * their intersection, we remember the last snapped line and keep snapping to this specific line as long
478 * as the distance from the intersection to the mouse pointer is less than remember_snap_threshold.
479 */
481 // Should we make the threshold settable in the preferences?
482 static double remember_snap_threshold = 30;
483 //static guint remember_snap_index = 0;
484 static guint remember_snap_index_center = 0;
486 static Proj::Pt3
487 box3d_snap (SPBox3D *box, int id, Proj::Pt3 const &pt_proj, Proj::Pt3 const &start_pt) {
488 double z_coord = start_pt[Proj::Z];
489 double diff_x = box->save_corner7[Proj::X] - box->save_corner0[Proj::X];
490 double diff_y = box->save_corner7[Proj::Y] - box->save_corner0[Proj::Y];
491 double x_coord = start_pt[Proj::X];
492 double y_coord = start_pt[Proj::Y];
493 Proj::Pt3 A_proj (x_coord, y_coord, z_coord, 1.0);
494 Proj::Pt3 B_proj (x_coord + diff_x, y_coord, z_coord, 1.0);
495 Proj::Pt3 C_proj (x_coord + diff_x, y_coord + diff_y, z_coord, 1.0);
496 Proj::Pt3 D_proj (x_coord, y_coord + diff_y, z_coord, 1.0);
497 Proj::Pt3 E_proj (x_coord - diff_x, y_coord + diff_y, z_coord, 1.0);
499 Persp3D *persp = box3d_get_perspective(box);
500 NR::Point A = persp->tmat.image(A_proj).affine();
501 NR::Point B = persp->tmat.image(B_proj).affine();
502 NR::Point C = persp->tmat.image(C_proj).affine();
503 NR::Point D = persp->tmat.image(D_proj).affine();
504 NR::Point E = persp->tmat.image(E_proj).affine();
505 NR::Point pt = persp->tmat.image(pt_proj).affine();
507 // TODO: Replace these lines between corners with lines from a corner to a vanishing point
508 // (this might help to prevent rounding errors if the box is small)
509 Box3D::Line pl1(A, B);
510 Box3D::Line pl2(A, D);
511 Box3D::Line diag1(A, (id == -1 || (!(id & Box3D::X) == !(id & Box3D::Y))) ? C : E);
512 Box3D::Line diag2(A, E); // diag2 is only taken into account if id equals -1, i.e., if we are snapping the center
514 int num_snap_lines = (id != -1) ? 3 : 4;
515 NR::Point snap_pts[num_snap_lines];
517 snap_pts[0] = pl1.closest_to (pt);
518 snap_pts[1] = pl2.closest_to (pt);
519 snap_pts[2] = diag1.closest_to (pt);
520 if (id == -1) {
521 snap_pts[3] = diag2.closest_to (pt);
522 }
524 gdouble const zoom = inkscape_active_desktop()->current_zoom();
526 // determine the distances to all potential snapping points
527 double snap_dists[num_snap_lines];
528 for (int i = 0; i < num_snap_lines; ++i) {
529 snap_dists[i] = NR::L2 (snap_pts[i] - pt) * zoom;
530 }
532 // while we are within a given tolerance of the starting point,
533 // keep snapping to the same point to avoid jumping
534 bool within_tolerance = true;
535 for (int i = 0; i < num_snap_lines; ++i) {
536 if (snap_dists[i] > remember_snap_threshold) {
537 within_tolerance = false;
538 break;
539 }
540 }
542 // find the closest snapping point
543 int snap_index = -1;
544 double snap_dist = NR_HUGE;
545 for (int i = 0; i < num_snap_lines; ++i) {
546 if (snap_dists[i] < snap_dist) {
547 snap_index = i;
548 snap_dist = snap_dists[i];
549 }
550 }
552 // snap to the closest point (or the previously remembered one
553 // if we are within tolerance of the starting point)
554 NR::Point result;
555 if (within_tolerance) {
556 result = snap_pts[remember_snap_index_center];
557 } else {
558 remember_snap_index_center = snap_index;
559 result = snap_pts[snap_index];
560 }
561 return box3d_get_perspective(box)->tmat.preimage (result, z_coord, Proj::Z);
562 }
564 void
565 box3d_set_corner (SPBox3D *box, const guint id, NR::Point const &new_pos, const Box3D::Axis movement, bool constrained) {
566 g_return_if_fail ((movement != Box3D::NONE) && (movement != Box3D::XYZ));
568 box->orig_corner0.normalize();
569 box->orig_corner7.normalize();
571 /* update corners 0 and 7 according to which handle was moved and to the axes of movement */
572 if (!(movement & Box3D::Z)) {
573 Proj::Pt3 pt_proj (box3d_get_perspective(box)->tmat.preimage (new_pos, (id < 4) ? box->orig_corner0[Proj::Z] :
574 box->orig_corner7[Proj::Z], Proj::Z));
575 if (constrained) {
576 pt_proj = box3d_snap (box, id, pt_proj, box3d_get_proj_corner (id, box->save_corner0, box->save_corner7));
577 }
579 // normalizing pt_proj is essential because we want to mingle affine coordinates
580 pt_proj.normalize();
581 box->orig_corner0 = Proj::Pt3 ((id & Box3D::X) ? box->save_corner0[Proj::X] : pt_proj[Proj::X],
582 (id & Box3D::Y) ? box->save_corner0[Proj::Y] : pt_proj[Proj::Y],
583 box->save_corner0[Proj::Z],
584 1.0);
585 box->orig_corner7 = Proj::Pt3 ((id & Box3D::X) ? pt_proj[Proj::X] : box->save_corner7[Proj::X],
586 (id & Box3D::Y) ? pt_proj[Proj::Y] : box->save_corner7[Proj::Y],
587 box->save_corner7[Proj::Z],
588 1.0);
589 } else {
590 Persp3D *persp = box3d_get_perspective(box);
591 Box3D::PerspectiveLine pl(persp->tmat.image(
592 box3d_get_proj_corner (id, box->save_corner0, box->save_corner7)).affine(),
593 Proj::Z, persp);
594 NR::Point new_pos_snapped(pl.closest_to(new_pos));
595 Proj::Pt3 pt_proj (persp->tmat.preimage (new_pos_snapped,
596 box3d_get_proj_corner (box, id)[(movement & Box3D::Y) ? Proj::X : Proj::Y],
597 (movement & Box3D::Y) ? Proj::X : Proj::Y));
598 bool corner0_move_x = !(id & Box3D::X) && (movement & Box3D::X);
599 bool corner0_move_y = !(id & Box3D::Y) && (movement & Box3D::Y);
600 bool corner7_move_x = (id & Box3D::X) && (movement & Box3D::X);
601 bool corner7_move_y = (id & Box3D::Y) && (movement & Box3D::Y);
602 // normalizing pt_proj is essential because we want to mingle affine coordinates
603 pt_proj.normalize();
604 box->orig_corner0 = Proj::Pt3 (corner0_move_x ? pt_proj[Proj::X] : box->orig_corner0[Proj::X],
605 corner0_move_y ? pt_proj[Proj::Y] : box->orig_corner0[Proj::Y],
606 (id & Box3D::Z) ? box->orig_corner0[Proj::Z] : pt_proj[Proj::Z],
607 1.0);
608 box->orig_corner7 = Proj::Pt3 (corner7_move_x ? pt_proj[Proj::X] : box->orig_corner7[Proj::X],
609 corner7_move_y ? pt_proj[Proj::Y] : box->orig_corner7[Proj::Y],
610 (id & Box3D::Z) ? pt_proj[Proj::Z] : box->orig_corner7[Proj::Z],
611 1.0);
612 }
613 // FIXME: Should we update the box here? If so, how?
614 }
616 void box3d_set_center (SPBox3D *box, NR::Point const &new_pos, NR::Point const &old_pos, const Box3D::Axis movement, bool constrained) {
617 g_return_if_fail ((movement != Box3D::NONE) && (movement != Box3D::XYZ));
619 Persp3D *persp = box3d_get_perspective(box);
620 if (!(movement & Box3D::Z)) {
621 double coord = (box->orig_corner0[Proj::Z] + box->orig_corner7[Proj::Z]) / 2;
622 double radx = (box->orig_corner7[Proj::X] - box->orig_corner0[Proj::X]) / 2;
623 double rady = (box->orig_corner7[Proj::Y] - box->orig_corner0[Proj::Y]) / 2;
625 Proj::Pt3 pt_proj (persp->tmat.preimage (new_pos, coord, Proj::Z));
626 if (constrained) {
627 Proj::Pt3 old_pos_proj (persp->tmat.preimage (old_pos, coord, Proj::Z));
628 pt_proj = box3d_snap (box, -1, pt_proj, old_pos_proj);
629 }
630 // normalizing pt_proj is essential because we want to mingle affine coordinates
631 pt_proj.normalize();
632 box->orig_corner0 = Proj::Pt3 ((movement & Box3D::X) ? pt_proj[Proj::X] - radx : box->orig_corner0[Proj::X],
633 (movement & Box3D::Y) ? pt_proj[Proj::Y] - rady : box->orig_corner0[Proj::Y],
634 box->orig_corner0[Proj::Z],
635 1.0);
636 box->orig_corner7 = Proj::Pt3 ((movement & Box3D::X) ? pt_proj[Proj::X] + radx : box->orig_corner7[Proj::X],
637 (movement & Box3D::Y) ? pt_proj[Proj::Y] + rady : box->orig_corner7[Proj::Y],
638 box->orig_corner7[Proj::Z],
639 1.0);
640 } else {
641 double coord = (box->orig_corner0[Proj::X] + box->orig_corner7[Proj::X]) / 2;
642 double radz = (box->orig_corner7[Proj::Z] - box->orig_corner0[Proj::Z]) / 2;
644 Box3D::PerspectiveLine pl(old_pos, Proj::Z, persp);
645 NR::Point new_pos_snapped(pl.closest_to(new_pos));
646 Proj::Pt3 pt_proj (persp->tmat.preimage (new_pos_snapped, coord, Proj::X));
648 /* normalizing pt_proj is essential because we want to mingle affine coordinates */
649 pt_proj.normalize();
650 box->orig_corner0 = Proj::Pt3 (box->orig_corner0[Proj::X],
651 box->orig_corner0[Proj::Y],
652 pt_proj[Proj::Z] - radz,
653 1.0);
654 box->orig_corner7 = Proj::Pt3 (box->orig_corner7[Proj::X],
655 box->orig_corner7[Proj::Y],
656 pt_proj[Proj::Z] + radz,
657 1.0);
658 }
659 }
661 /*
662 * Manipulates corner1 through corner4 to contain the indices of the corners
663 * from which the perspective lines in the direction of 'axis' emerge
664 */
665 void box3d_corners_for_PLs (const SPBox3D * box, Proj::Axis axis,
666 NR::Point &corner1, NR::Point &corner2, NR::Point &corner3, NR::Point &corner4)
667 {
668 Persp3D *persp = box3d_get_perspective(box);
669 g_return_if_fail (persp);
670 //box->orig_corner0.normalize();
671 //box->orig_corner7.normalize();
672 double coord = (box->orig_corner0[axis] > box->orig_corner7[axis]) ?
673 box->orig_corner0[axis] :
674 box->orig_corner7[axis];
676 Proj::Pt3 c1, c2, c3, c4;
677 // FIXME: This can certainly be done more elegantly/efficiently than by a case-by-case analysis.
678 switch (axis) {
679 case Proj::X:
680 c1 = Proj::Pt3 (coord, box->orig_corner0[Proj::Y], box->orig_corner0[Proj::Z], 1.0);
681 c2 = Proj::Pt3 (coord, box->orig_corner7[Proj::Y], box->orig_corner0[Proj::Z], 1.0);
682 c3 = Proj::Pt3 (coord, box->orig_corner7[Proj::Y], box->orig_corner7[Proj::Z], 1.0);
683 c4 = Proj::Pt3 (coord, box->orig_corner0[Proj::Y], box->orig_corner7[Proj::Z], 1.0);
684 break;
685 case Proj::Y:
686 c1 = Proj::Pt3 (box->orig_corner0[Proj::X], coord, box->orig_corner0[Proj::Z], 1.0);
687 c2 = Proj::Pt3 (box->orig_corner7[Proj::X], coord, box->orig_corner0[Proj::Z], 1.0);
688 c3 = Proj::Pt3 (box->orig_corner7[Proj::X], coord, box->orig_corner7[Proj::Z], 1.0);
689 c4 = Proj::Pt3 (box->orig_corner0[Proj::X], coord, box->orig_corner7[Proj::Z], 1.0);
690 break;
691 case Proj::Z:
692 c1 = Proj::Pt3 (box->orig_corner7[Proj::X], box->orig_corner7[Proj::Y], coord, 1.0);
693 c2 = Proj::Pt3 (box->orig_corner7[Proj::X], box->orig_corner0[Proj::Y], coord, 1.0);
694 c3 = Proj::Pt3 (box->orig_corner0[Proj::X], box->orig_corner0[Proj::Y], coord, 1.0);
695 c4 = Proj::Pt3 (box->orig_corner0[Proj::X], box->orig_corner7[Proj::Y], coord, 1.0);
696 break;
697 default:
698 return;
699 }
700 corner1 = persp->tmat.image(c1).affine();
701 corner2 = persp->tmat.image(c2).affine();
702 corner3 = persp->tmat.image(c3).affine();
703 corner4 = persp->tmat.image(c4).affine();
704 }
706 /* Auxiliary function: Checks whether the half-line from A to B crosses the line segment joining C and D */
707 static bool
708 box3d_half_line_crosses_joining_line (Geom::Point const &A, Geom::Point const &B,
709 Geom::Point const &C, Geom::Point const &D) {
710 Geom::Point E; // the point of intersection
711 Geom::Point n0 = (B - A).ccw();
712 double d0 = dot(n0,A);
714 Geom::Point n1 = (D - C).ccw();
715 double d1 = dot(n1,C);
716 Geom::IntersectorKind intersects = Geom::line_intersection(n0, d0, n1, d1, E);
717 if (intersects == Geom::coincident || intersects == Geom::parallel) {
718 return false;
719 }
721 if ((dot(C,n0) < d0) == (dot(D,n0) < d0)) {
722 // C and D lie on the same side of the line AB
723 return false;
724 }
725 if ((dot(A,n1) < d1) != (dot(B,n1) < d1)) {
726 // A and B lie on different sides of the line CD
727 return true;
728 } else if (Geom::distance(E,A) < Geom::distance(E,B)) {
729 // The line CD passes on the "wrong" side of A
730 return false;
731 }
733 // The line CD passes on the "correct" side of A
734 return true;
735 }
737 static bool
738 box3d_XY_axes_are_swapped (SPBox3D *box) {
739 Persp3D *persp = box3d_get_perspective(box);
740 g_return_val_if_fail(persp, false);
741 Box3D::PerspectiveLine l1(box3d_get_corner_screen(box, 3), Proj::X, persp);
742 Box3D::PerspectiveLine l2(box3d_get_corner_screen(box, 3), Proj::Y, persp);
743 NR::Point v1(l1.direction());
744 NR::Point v2(l2.direction());
745 v1.normalize();
746 v2.normalize();
748 return (v1[NR::X]*v2[NR::Y] - v1[NR::Y]*v2[NR::X] > 0);
749 }
751 static inline void
752 box3d_aux_set_z_orders (int z_orders[6], int a, int b, int c, int d, int e, int f) {
753 z_orders[0] = a;
754 z_orders[1] = b;
755 z_orders[2] = c;
756 z_orders[3] = d;
757 z_orders[4] = e;
758 z_orders[5] = f;
759 }
761 static inline void
762 box3d_swap_z_orders (int z_orders[6]) {
763 int tmp;
764 for (int i = 0; i < 3; ++i) {
765 tmp = z_orders[i];
766 z_orders[i] = z_orders[5-i];
767 z_orders[5-i] = tmp;
768 }
769 }
771 /*
772 * In standard perspective we have:
773 * 2 = front face
774 * 1 = top face
775 * 0 = left face
776 * 3 = right face
777 * 4 = bottom face
778 * 5 = rear face
779 */
781 /* All VPs infinite */
782 static void
783 box3d_set_new_z_orders_case0 (SPBox3D *box, int z_orders[6], Box3D::Axis central_axis) {
784 Persp3D *persp = box3d_get_perspective(box);
785 NR::Point xdir(persp3d_get_infinite_dir(persp, Proj::X));
786 NR::Point ydir(persp3d_get_infinite_dir(persp, Proj::Y));
787 NR::Point zdir(persp3d_get_infinite_dir(persp, Proj::Z));
789 bool swapped = box3d_XY_axes_are_swapped(box);
791 //g_print ("3 infinite VPs; ");
792 switch(central_axis) {
793 case Box3D::X:
794 if (!swapped) {
795 //g_print ("central axis X (case a)");
796 box3d_aux_set_z_orders (z_orders, 2, 0, 4, 1, 3, 5);
797 } else {
798 //g_print ("central axis X (case b)");
799 box3d_aux_set_z_orders (z_orders, 3, 1, 5, 2, 4, 0);
800 }
801 break;
802 case Box3D::Y:
803 if (!swapped) {
804 //g_print ("central axis Y (case a)");
805 box3d_aux_set_z_orders (z_orders, 2, 3, 1, 4, 0, 5);
806 } else {
807 //g_print ("central axis Y (case b)");
808 box3d_aux_set_z_orders (z_orders, 5, 0, 4, 1, 3, 2);
809 }
810 break;
811 case Box3D::Z:
812 if (!swapped) {
813 //g_print ("central axis Z (case a)");
814 box3d_aux_set_z_orders (z_orders, 2, 0, 1, 4, 3, 5);
815 } else {
816 //g_print ("central axis Z (case b)");
817 box3d_aux_set_z_orders (z_orders, 5, 3, 4, 1, 0, 2);
818 }
819 break;
820 case Box3D::NONE:
821 if (!swapped) {
822 //g_print ("central axis NONE (case a)");
823 box3d_aux_set_z_orders (z_orders, 2, 3, 4, 1, 0, 5);
824 } else {
825 //g_print ("central axis NONE (case b)");
826 box3d_aux_set_z_orders (z_orders, 5, 0, 1, 4, 3, 2);
827 }
828 break;
829 default:
830 g_assert_not_reached();
831 break;
832 }
833 /**
834 if (swapped) {
835 g_print ("; swapped");
836 }
837 g_print ("\n");
838 **/
839 }
841 /* Precisely one finite VP */
842 static void
843 box3d_set_new_z_orders_case1 (SPBox3D *box, int z_orders[6], Box3D::Axis central_axis, Box3D::Axis fin_axis) {
844 Persp3D *persp = box3d_get_perspective(box);
845 NR::Point vp(persp3d_get_VP(persp, Box3D::toProj(fin_axis)).affine());
847 // note: in some of the case distinctions below we rely upon the fact that oaxis1 and oaxis2 are ordered
848 Box3D::Axis oaxis1 = Box3D::get_remaining_axes(fin_axis).first;
849 Box3D::Axis oaxis2 = Box3D::get_remaining_axes(fin_axis).second;
850 //g_print ("oaxis1 = %s, oaxis2 = %s\n", Box3D::string_from_axes(oaxis1), Box3D::string_from_axes(oaxis2));
851 int inside1 = 0;
852 int inside2 = 0;
853 inside1 = box3d_pt_lies_in_PL_sector (box, vp, 3, 3 ^ oaxis2, oaxis1);
854 inside2 = box3d_pt_lies_in_PL_sector (box, vp, 3, 3 ^ oaxis1, oaxis2);
855 //g_print ("inside1 = %d, inside2 = %d\n", inside1, inside2);
857 bool swapped = box3d_XY_axes_are_swapped(box);
859 //g_print ("2 infinite VPs; ");
860 //g_print ("finite axis: %s; ", Box3D::string_from_axes(fin_axis));
861 switch(central_axis) {
862 case Box3D::X:
863 if (!swapped) {
864 //g_print ("central axis X (case a)");
865 box3d_aux_set_z_orders (z_orders, 2, 4, 0, 1, 3, 5);
866 } else {
867 //if (inside2) {
868 //g_print ("central axis X (case b)");
869 box3d_aux_set_z_orders (z_orders, 5, 3, 1, 0, 2, 4);
870 //} else {
871 //g_print ("central axis X (case c)");
872 //box3d_aux_set_z_orders (z_orders, 5, 3, 1, 2, 0, 4);
873 //}
874 }
875 break;
876 case Box3D::Y:
877 if (inside2 > 0) {
878 //g_print ("central axis Y (case a)");
879 box3d_aux_set_z_orders (z_orders, 1, 2, 3, 0, 5, 4);
880 } else if (inside2 < 0) {
881 //g_print ("central axis Y (case b)");
882 box3d_aux_set_z_orders (z_orders, 2, 3, 1, 4, 0, 5);
883 } else {
884 if (!swapped) {
885 //g_print ("central axis Y (case c1)");
886 box3d_aux_set_z_orders (z_orders, 2, 3, 1, 5, 0, 4);
887 } else {
888 //g_print ("central axis Y (case c2)");
889 box3d_aux_set_z_orders (z_orders, 5, 0, 4, 1, 3, 2);
890 }
891 }
892 break;
893 case Box3D::Z:
894 if (inside2) {
895 if (!swapped) {
896 //g_print ("central axis Z (case a1)");
897 box3d_aux_set_z_orders (z_orders, 2, 1, 3, 0, 4, 5);
898 } else {
899 //g_print ("central axis Z (case a2)");
900 box3d_aux_set_z_orders (z_orders, 5, 3, 4, 0, 1, 2);
901 }
902 } else if (inside1) {
903 if (!swapped) {
904 //g_print ("central axis Z (case b1)");
905 box3d_aux_set_z_orders (z_orders, 2, 0, 1, 4, 3, 5);
906 } else {
907 //g_print ("central axis Z (case b2)");
908 box3d_aux_set_z_orders (z_orders, 5, 3, 4, 1, 0, 2);
909 //box3d_aux_set_z_orders (z_orders, 5, 3, 0, 1, 2, 4);
910 }
911 } else {
912 // "regular" case
913 if (!swapped) {
914 //g_print ("central axis Z (case c1)");
915 box3d_aux_set_z_orders (z_orders, 0, 1, 2, 5, 4, 3);
916 } else {
917 //g_print ("central axis Z (case c2)");
918 box3d_aux_set_z_orders (z_orders, 5, 3, 4, 0, 2, 1);
919 //box3d_aux_set_z_orders (z_orders, 5, 3, 4, 0, 2, 1);
920 }
921 }
922 break;
923 case Box3D::NONE:
924 if (!swapped) {
925 //g_print ("central axis NONE (case a)");
926 box3d_aux_set_z_orders (z_orders, 2, 3, 4, 5, 0, 1);
927 } else {
928 //g_print ("central axis NONE (case b)");
929 box3d_aux_set_z_orders (z_orders, 5, 0, 1, 3, 2, 4);
930 //box3d_aux_set_z_orders (z_orders, 2, 3, 4, 1, 0, 5);
931 }
932 break;
933 default:
934 g_assert_not_reached();
935 }
936 /**
937 if (swapped) {
938 g_print ("; swapped");
939 }
940 g_print ("\n");
941 **/
942 }
944 /* Precisely 2 finite VPs */
945 static void
946 box3d_set_new_z_orders_case2 (SPBox3D *box, int z_orders[6], Box3D::Axis central_axis, Box3D::Axis /*infinite_axis*/) {
947 Persp3D *persp = box3d_get_perspective(box);
949 NR::Point c3(box3d_get_corner_screen(box, 3));
950 NR::Point xdir(persp3d_get_PL_dir_from_pt(persp, c3, Proj::X));
951 NR::Point ydir(persp3d_get_PL_dir_from_pt(persp, c3, Proj::Y));
952 NR::Point zdir(persp3d_get_PL_dir_from_pt(persp, c3, Proj::Z));
954 bool swapped = box3d_XY_axes_are_swapped(box);
956 int insidexy = box3d_VP_lies_in_PL_sector (box, Proj::X, 3, 3 ^ Box3D::Z, Box3D::Y);
957 int insidexz = box3d_VP_lies_in_PL_sector (box, Proj::X, 3, 3 ^ Box3D::Y, Box3D::Z);
959 int insideyx = box3d_VP_lies_in_PL_sector (box, Proj::Y, 3, 3 ^ Box3D::Z, Box3D::X);
960 int insideyz = box3d_VP_lies_in_PL_sector (box, Proj::Y, 3, 3 ^ Box3D::X, Box3D::Z);
962 int insidezx = box3d_VP_lies_in_PL_sector (box, Proj::Z, 3, 3 ^ Box3D::Y, Box3D::X);
963 int insidezy = box3d_VP_lies_in_PL_sector (box, Proj::Z, 3, 3 ^ Box3D::X, Box3D::Y);
965 //g_print ("Insides: xy = %d, xz = %d, yx = %d, yz = %d, zx = %d, zy = %d\n",
966 // insidexy, insidexz, insideyx, insideyz, insidezx, insidezy);
967 (void)insidexz;
968 (void)insideyx;
969 (void)insidezx;
971 //g_print ("1 infinite VP; ");
972 switch(central_axis) {
973 case Box3D::X:
974 if (!swapped) {
975 if (insidezy == -1) {
976 //g_print ("central axis X (case a1)");
977 box3d_aux_set_z_orders (z_orders, 2, 4, 0, 1, 3, 5);
978 } else if (insidexy == 1) {
979 //g_print ("central axis X (case a2)");
980 box3d_aux_set_z_orders (z_orders, 2, 4, 0, 5, 1, 3);
981 } else {
982 //g_print ("central axis X (case a3)");
983 box3d_aux_set_z_orders (z_orders, 2, 4, 0, 1, 3, 5);
984 }
985 } else {
986 if (insideyz == -1) {
987 //g_print ("central axis X (case b1)");
988 box3d_aux_set_z_orders (z_orders, 3, 1, 5, 0, 2, 4);
989 } else {
990 if (!swapped) {
991 //g_print ("central axis X (case b2)");
992 box3d_aux_set_z_orders (z_orders, 3, 1, 5, 2, 4, 0);
993 } else {
994 //g_print ("central axis X (case b3)");
995 box3d_aux_set_z_orders (z_orders, 3, 1, 5, 0, 2, 4);
996 }
997 }
998 }
999 break;
1000 case Box3D::Y:
1001 if (!swapped) {
1002 if (insideyz == 1) {
1003 //g_print ("central axis Y (case a1)");
1004 box3d_aux_set_z_orders (z_orders, 2, 3, 1, 0, 5, 4);
1005 } else {
1006 //g_print ("central axis Y (case a2)");
1007 box3d_aux_set_z_orders (z_orders, 2, 3, 1, 5, 0, 4);
1008 }
1009 } else {
1010 //g_print ("central axis Y (case b)");
1011 box3d_aux_set_z_orders (z_orders, 5, 0, 4, 1, 3, 2);
1012 }
1013 break;
1014 case Box3D::Z:
1015 if (!swapped) {
1016 if (insidezy == 1) {
1017 //g_print ("central axis Z (case a1)");
1018 box3d_aux_set_z_orders (z_orders, 2, 1, 0, 4, 3, 5);
1019 } else if (insidexy == -1) {
1020 //g_print ("central axis Z (case a2)");
1021 box3d_aux_set_z_orders (z_orders, 2, 1, 0, 5, 4, 3);
1022 } else {
1023 //g_print ("central axis Z (case a3)");
1024 box3d_aux_set_z_orders (z_orders, 2, 0, 1, 5, 3, 4);
1025 }
1026 } else {
1027 //g_print ("central axis Z (case b)");
1028 box3d_aux_set_z_orders (z_orders, 3, 4, 5, 1, 0, 2);
1029 }
1030 break;
1031 case Box3D::NONE:
1032 if (!swapped) {
1033 //g_print ("central axis NONE (case a)");
1034 box3d_aux_set_z_orders (z_orders, 2, 3, 4, 1, 0, 5);
1035 } else {
1036 //g_print ("central axis NONE (case b)");
1037 box3d_aux_set_z_orders (z_orders, 5, 0, 1, 4, 3, 2);
1038 }
1039 break;
1040 default:
1041 g_assert_not_reached();
1042 break;
1043 }
1044 /**
1045 if (swapped) {
1046 g_print ("; swapped");
1047 }
1048 g_print ("\n");
1049 **/
1050 }
1052 /*
1053 * It can happen that during dragging the box is everted.
1054 * In this case the opposite sides in this direction need to be swapped
1055 */
1056 static Box3D::Axis
1057 box3d_everted_directions (SPBox3D *box) {
1058 Box3D::Axis ev = Box3D::NONE;
1060 box->orig_corner0.normalize();
1061 box->orig_corner7.normalize();
1063 if (box->orig_corner0[Proj::X] < box->orig_corner7[Proj::X])
1064 ev = (Box3D::Axis) (ev ^ Box3D::X);
1065 if (box->orig_corner0[Proj::Y] < box->orig_corner7[Proj::Y])
1066 ev = (Box3D::Axis) (ev ^ Box3D::Y);
1067 if (box->orig_corner0[Proj::Z] > box->orig_corner7[Proj::Z]) // FIXME: Remove the need to distinguish signs among the cases
1068 ev = (Box3D::Axis) (ev ^ Box3D::Z);
1070 return ev;
1071 }
1073 static void
1074 box3d_swap_sides(int z_orders[6], Box3D::Axis axis) {
1075 int pos1 = -1;
1076 int pos2 = -1;
1078 for (int i = 0; i < 6; ++i) {
1079 if (!(Box3D::int_to_face(z_orders[i]) & axis)) {
1080 if (pos1 == -1) {
1081 pos1 = i;
1082 } else {
1083 pos2 = i;
1084 break;
1085 }
1086 }
1087 }
1089 int tmp = z_orders[pos1];
1090 z_orders[pos1] = z_orders[pos2];
1091 z_orders[pos2] = tmp;
1092 }
1095 bool
1096 box3d_recompute_z_orders (SPBox3D *box) {
1097 Persp3D *persp = box3d_get_perspective(box);
1099 //g_return_val_if_fail(persp, false);
1100 if (!persp)
1101 return false;
1103 int z_orders[6];
1105 NR::Point c3(box3d_get_corner_screen(box, 3));
1107 // determine directions from corner3 to the VPs
1108 int num_finite = 0;
1109 Box3D::Axis axis_finite = Box3D::NONE;
1110 Box3D::Axis axis_infinite = Box3D::NONE;
1111 NR::Point dirs[3];
1112 for (int i = 0; i < 3; ++i) {
1113 dirs[i] = persp3d_get_PL_dir_from_pt(persp, c3, Box3D::toProj(Box3D::axes[i]));
1114 if (persp3d_VP_is_finite(persp, Proj::axes[i])) {
1115 num_finite++;
1116 axis_finite = Box3D::axes[i];
1117 } else {
1118 axis_infinite = Box3D::axes[i];
1119 }
1120 }
1122 // determine the "central" axis (if there is one)
1123 Box3D::Axis central_axis = Box3D::NONE;
1124 if(Box3D::lies_in_sector(dirs[0], dirs[1], dirs[2])) {
1125 central_axis = Box3D::Z;
1126 } else if(Box3D::lies_in_sector(dirs[1], dirs[2], dirs[0])) {
1127 central_axis = Box3D::X;
1128 } else if(Box3D::lies_in_sector(dirs[2], dirs[0], dirs[1])) {
1129 central_axis = Box3D::Y;
1130 }
1132 switch (num_finite) {
1133 case 0:
1134 // TODO: Remark: In this case (and maybe one of the others, too) the z-orders for all boxes
1135 // coincide, hence only need to be computed once in a more central location.
1136 box3d_set_new_z_orders_case0(box, z_orders, central_axis);
1137 break;
1138 case 1:
1139 box3d_set_new_z_orders_case1(box, z_orders, central_axis, axis_finite);
1140 break;
1141 case 2:
1142 case 3:
1143 box3d_set_new_z_orders_case2(box, z_orders, central_axis, axis_infinite);
1144 break;
1145 default:
1146 /*
1147 * For each VP F, check wether the half-line from the corner3 to F crosses the line segment
1148 * joining the other two VPs. If this is the case, it determines the "central" corner from
1149 * which the visible sides can be deduced. Otherwise, corner3 is the central corner.
1150 */
1151 // FIXME: We should eliminate the use of NR::Point altogether
1152 Box3D::Axis central_axis = Box3D::NONE;
1153 NR::Point vp_x = persp3d_get_VP(persp, Proj::X).affine();
1154 NR::Point vp_y = persp3d_get_VP(persp, Proj::Y).affine();
1155 NR::Point vp_z = persp3d_get_VP(persp, Proj::Z).affine();
1156 Geom::Point vpx(vp_x[NR::X], vp_x[NR::Y]);
1157 Geom::Point vpy(vp_y[NR::X], vp_y[NR::Y]);
1158 Geom::Point vpz(vp_z[NR::X], vp_z[NR::Y]);
1160 NR::Point c3 = box3d_get_corner_screen(box, 3);
1161 Geom::Point corner3(c3[NR::X], c3[NR::Y]);
1163 if (box3d_half_line_crosses_joining_line (corner3, vpx, vpy, vpz)) {
1164 central_axis = Box3D::X;
1165 } else if (box3d_half_line_crosses_joining_line (corner3, vpy, vpz, vpx)) {
1166 central_axis = Box3D::Y;
1167 } else if (box3d_half_line_crosses_joining_line (corner3, vpz, vpx, vpy)) {
1168 central_axis = Box3D::Z;
1169 }
1170 //g_print ("Crossing: %s\n", Box3D::string_from_axes(central_axis));
1172 unsigned int central_corner = 3 ^ central_axis;
1173 if (central_axis == Box3D::Z) {
1174 central_corner = central_corner ^ Box3D::XYZ;
1175 }
1176 if (box3d_XY_axes_are_swapped(box)) {
1177 //g_print ("Axes X and Y are swapped\n");
1178 central_corner = central_corner ^ Box3D::XYZ;
1179 }
1181 NR::Point c1(box3d_get_corner_screen(box, 1));
1182 NR::Point c2(box3d_get_corner_screen(box, 2));
1183 NR::Point c7(box3d_get_corner_screen(box, 7));
1185 Geom::Point corner1(c1[NR::X], c1[NR::Y]);
1186 Geom::Point corner2(c2[NR::X], c2[NR::Y]);
1187 Geom::Point corner7(c7[NR::X], c7[NR::Y]);
1188 // FIXME: At present we don't use the information about central_corner computed above.
1189 switch (central_axis) {
1190 case Box3D::Y:
1191 if (!box3d_half_line_crosses_joining_line(vpz, vpy, corner3, corner2)) {
1192 box3d_aux_set_z_orders (z_orders, 2, 3, 1, 5, 0, 4);
1193 } else {
1194 // degenerate case
1195 //g_print ("Degenerate case #1\n");
1196 box3d_aux_set_z_orders (z_orders, 2, 1, 3, 0, 5, 4);
1197 }
1198 break;
1200 case Box3D::Z:
1201 if (box3d_half_line_crosses_joining_line(vpx, vpz, corner3, corner1)) {
1202 // degenerate case
1203 //g_print ("Degenerate case #2\n");
1204 box3d_aux_set_z_orders (z_orders, 2, 0, 1, 4, 3, 5);
1205 } else if (box3d_half_line_crosses_joining_line(vpx, vpy, corner3, corner7)) {
1206 // degenerate case
1207 //g_print ("Degenerate case #3\n");
1208 box3d_aux_set_z_orders (z_orders, 2, 1, 0, 5, 3, 4);
1209 } else {
1210 box3d_aux_set_z_orders (z_orders, 2, 1, 0, 3, 4, 5);
1211 }
1212 break;
1214 case Box3D::X:
1215 if (box3d_half_line_crosses_joining_line(vpz, vpx, corner3, corner1)) {
1216 // degenerate case
1217 //g_print ("Degenerate case #4\n");
1218 box3d_aux_set_z_orders (z_orders, 2, 1, 0, 4, 5, 3);
1219 } else {
1220 box3d_aux_set_z_orders (z_orders, 2, 4, 0, 5, 1, 3);
1221 }
1222 break;
1224 case Box3D::NONE:
1225 box3d_aux_set_z_orders (z_orders, 2, 3, 4, 1, 0, 5);
1226 break;
1228 default:
1229 g_assert_not_reached();
1230 break;
1231 } // end default case
1232 }
1234 // TODO: If there are still errors in z-orders of everted boxes, we need to choose a variable corner
1235 // instead of the hard-coded corner #3 in the computations above
1236 Box3D::Axis ev = box3d_everted_directions(box);
1237 for (int i = 0; i < 3; ++i) {
1238 if (ev & Box3D::axes[i]) {
1239 box3d_swap_sides(z_orders, Box3D::axes[i]);
1240 }
1241 }
1243 // Check whether anything actually changed
1244 for (int i = 0; i < 6; ++i) {
1245 if (box->z_orders[i] != z_orders[i]) {
1246 for (int j = i; j < 6; ++j) {
1247 box->z_orders[j] = z_orders[j];
1248 }
1249 return true;
1250 }
1251 }
1252 return false;
1253 }
1255 static std::map<int, Box3DSide *>
1256 box3d_get_sides (SPBox3D *box) {
1257 std::map<int, Box3DSide *> sides;
1258 for (SPObject *side = sp_object_first_child(box); side != NULL; side = SP_OBJECT_NEXT(side)) {
1259 sides[Box3D::face_to_int(sp_repr_get_int_attribute(SP_OBJECT_REPR(side),
1260 "inkscape:box3dsidetype", -1))] = SP_BOX3D_SIDE(side);
1261 }
1262 sides.erase(-1);
1263 return sides;
1264 }
1267 // TODO: Check whether the box is everted in any direction and swap the sides opposite to this direction
1268 void
1269 box3d_set_z_orders (SPBox3D *box) {
1270 // For efficiency reasons, we only set the new z-orders if something really changed
1271 if (box3d_recompute_z_orders (box)) {
1272 std::map<int, Box3DSide *> sides = box3d_get_sides(box);
1273 std::map<int, Box3DSide *>::iterator side;
1274 for (unsigned int i = 0; i < 6; ++i) {
1275 side = sides.find(box->z_orders[i]);
1276 if (side != sides.end()) {
1277 SP_ITEM((*side).second)->lowerToBottom();
1278 }
1279 }
1280 /**
1281 g_print ("Resetting z-orders: ");
1282 for (int i = 0; i < 6; ++i) {
1283 g_print ("%d ", box->z_orders[i]);
1284 }
1285 g_print ("\n");
1286 **/
1287 }
1288 }
1290 /*
1291 * Auxiliary function for z-order recomputing:
1292 * Determines whether \a pt lies in the sector formed by the two PLs from the corners with IDs
1293 * \a i21 and \a id2 to the VP in direction \a axis. If the VP is infinite, we say that \a pt
1294 * lies in the sector if it lies between the two (parallel) PLs.
1295 * \ret * 0 if \a pt doesn't lie in the sector
1296 * * 1 if \a pt lies in the sector and either VP is finite of VP is infinite and the direction
1297 * from the edge between the two corners to \a pt points towards the VP
1298 * * -1 otherwise
1299 */
1300 // TODO: Maybe it would be useful to have a similar method for projective points pt because then we
1301 // can use it for VPs and perhaps merge the case distinctions during z-order recomputation.
1302 int
1303 box3d_pt_lies_in_PL_sector (SPBox3D const *box, NR::Point const &pt, int id1, int id2, Box3D::Axis axis) {
1304 Persp3D *persp = box3d_get_perspective(box);
1306 // the two corners
1307 NR::Point c1(box3d_get_corner_screen(box, id1));
1308 NR::Point c2(box3d_get_corner_screen(box, id2));
1310 int ret = 0;
1311 if (persp3d_VP_is_finite(persp, Box3D::toProj(axis))) {
1312 NR::Point vp(persp3d_get_VP(persp, Box3D::toProj(axis)).affine());
1313 NR::Point v1(c1 - vp);
1314 NR::Point v2(c2 - vp);
1315 NR::Point w(pt - vp);
1316 ret = static_cast<int>(Box3D::lies_in_sector(v1, v2, w));
1317 //g_print ("Case 0 - returning %d\n", ret);
1318 } else {
1319 Box3D::PerspectiveLine pl1(c1, Box3D::toProj(axis), persp);
1320 Box3D::PerspectiveLine pl2(c2, Box3D::toProj(axis), persp);
1321 if (pl1.lie_on_same_side(pt, c2) && pl2.lie_on_same_side(pt, c1)) {
1322 // test whether pt lies "towards" or "away from" the VP
1323 Box3D::Line edge(c1,c2);
1324 NR::Point c3(box3d_get_corner_screen(box, id1 ^ axis));
1325 if (edge.lie_on_same_side(pt, c3)) {
1326 ret = 1;
1327 } else {
1328 ret = -1;
1329 }
1330 }
1331 //g_print ("Case 1 - returning %d\n", ret);
1332 }
1333 return ret;
1334 }
1336 int
1337 box3d_VP_lies_in_PL_sector (SPBox3D const *box, Proj::Axis vpdir, int id1, int id2, Box3D::Axis axis) {
1338 Persp3D *persp = box3d_get_perspective(box);
1340 if (!persp3d_VP_is_finite(persp, vpdir)) {
1341 return 0;
1342 } else {
1343 return box3d_pt_lies_in_PL_sector(box, persp3d_get_VP(persp, vpdir).affine(), id1, id2, axis);
1344 }
1345 }
1347 /* swap the coordinates of corner0 and corner7 along the specified axis */
1348 static void
1349 box3d_swap_coords(SPBox3D *box, Proj::Axis axis, bool smaller = true) {
1350 box->orig_corner0.normalize();
1351 box->orig_corner7.normalize();
1352 if ((box->orig_corner0[axis] < box->orig_corner7[axis]) != smaller) {
1353 double tmp = box->orig_corner0[axis];
1354 box->orig_corner0[axis] = box->orig_corner7[axis];
1355 box->orig_corner7[axis] = tmp;
1356 }
1357 // FIXME: Should we also swap the coordinates of save_corner0 and save_corner7?
1358 }
1360 /* ensure that the coordinates of corner0 and corner7 are in the correct order (to prevent everted boxes) */
1361 void
1362 box3d_relabel_corners(SPBox3D *box) {
1363 box3d_swap_coords(box, Proj::X, false);
1364 box3d_swap_coords(box, Proj::Y, false);
1365 box3d_swap_coords(box, Proj::Z, true);
1366 }
1368 static void
1369 box3d_check_for_swapped_coords(SPBox3D *box, Proj::Axis axis, bool smaller) {
1370 box->orig_corner0.normalize();
1371 box->orig_corner7.normalize();
1373 if ((box->orig_corner0[axis] < box->orig_corner7[axis]) != smaller) {
1374 box->swapped = (Box3D::Axis) (box->swapped | Proj::toAffine(axis));
1375 } else {
1376 box->swapped = (Box3D::Axis) (box->swapped & ~Proj::toAffine(axis));
1377 }
1378 }
1380 static void
1381 box3d_exchange_coords(SPBox3D *box) {
1382 box->orig_corner0.normalize();
1383 box->orig_corner7.normalize();
1385 for (int i = 0; i < 3; ++i) {
1386 if (box->swapped & Box3D::axes[i]) {
1387 double tmp = box->orig_corner0[i];
1388 box->orig_corner0[i] = box->orig_corner7[i];
1389 box->orig_corner7[i] = tmp;
1390 }
1391 }
1392 }
1394 void
1395 box3d_check_for_swapped_coords(SPBox3D *box) {
1396 box3d_check_for_swapped_coords(box, Proj::X, false);
1397 box3d_check_for_swapped_coords(box, Proj::Y, false);
1398 box3d_check_for_swapped_coords(box, Proj::Z, true);
1400 box3d_exchange_coords(box);
1401 }
1403 void
1404 box3d_add_to_selection(SPBox3D *box) {
1405 Persp3D *persp = box3d_get_perspective(box);
1406 g_return_if_fail(persp);
1407 persp3d_add_box_transform(persp, box);
1408 }
1410 void
1411 box3d_remove_from_selection(SPBox3D *box) {
1412 Persp3D *persp = box3d_get_perspective(box);
1413 if (!persp) {
1414 /* this can happen if a box is deleted through undo and the persp_ref is already detached;
1415 should we rebuild the boxes of each perspective in this case or is it safe to leave it alone? */
1416 return;
1417 }
1418 persp3d_remove_box_transform(persp, box);
1419 }
1421 void
1422 box3d_mark_transformed(SPBox3D *box) {
1423 Persp3D *persp = box3d_get_perspective(box);
1424 g_return_if_fail(persp);
1425 persp3d_set_box_transformed(persp, box, true);
1426 }
1428 Persp3D *
1429 box3d_get_perspective(SPBox3D const *box) {
1430 return box->persp_ref->getObject();
1431 }
1433 void
1434 box3d_switch_perspectives(SPBox3D *box, Persp3D *old_persp, Persp3D *new_persp, bool recompute_corners) {
1435 if (recompute_corners) {
1436 box->orig_corner0.normalize();
1437 box->orig_corner7.normalize();
1438 double z0 = box->orig_corner0[Proj::Z];
1439 double z7 = box->orig_corner7[Proj::Z];
1440 NR::Point corner0_screen = box3d_get_corner_screen(box, 0);
1441 NR::Point corner7_screen = box3d_get_corner_screen(box, 7);
1443 box->orig_corner0 = new_persp->tmat.preimage(corner0_screen, z0, Proj::Z);
1444 box->orig_corner7 = new_persp->tmat.preimage(corner7_screen, z7, Proj::Z);
1445 }
1447 persp3d_remove_box (old_persp, box);
1448 persp3d_add_box (new_persp, box);
1450 persp3d_remove_box_transform (old_persp, box);
1451 persp3d_add_box_transform (new_persp, box);
1453 gchar *href = g_strdup_printf("#%s", SP_OBJECT_REPR(new_persp)->attribute("id"));
1454 SP_OBJECT_REPR(box)->setAttribute("inkscape:perspectiveID", href);
1455 g_free(href);
1456 }
1458 /* Converts the 3D box to an ordinary SPGroup, adds it to the XML tree at the same position as
1459 the original box and deletes the latter */
1460 // TODO: Copy over all important attributes (see sp_selected_item_to_curved_repr() for an example)
1461 SPGroup *
1462 box3d_convert_to_group(SPBox3D *box) {
1463 SPDocument *doc = SP_OBJECT_DOCUMENT(box);
1464 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
1466 // remember position of the box
1467 int pos = SP_OBJECT_REPR(box)->position();
1469 // create a new group and add the sides (converted to ordinary paths) as its children
1470 Inkscape::XML::Node *grepr = xml_doc->createElement("svg:g");
1472 Inkscape::XML::Node *repr;
1473 for (SPObject *child = sp_object_first_child(SP_OBJECT(box)); child != NULL; child = SP_OBJECT_NEXT(child) ) {
1474 if (SP_IS_BOX3D_SIDE(child)) {
1475 repr = box3d_side_convert_to_path(SP_BOX3D_SIDE(child));
1476 grepr->appendChild(repr);
1477 } else {
1478 g_warning("Non-side object encountered as child of a 3D box.\n");
1479 }
1480 }
1482 // add the new group to the box's parent and set remembered position
1483 SPObject *parent = SP_OBJECT_PARENT(box);
1484 SP_OBJECT_REPR(parent)->appendChild(grepr);
1485 grepr->setPosition(pos);
1487 SP_OBJECT(box)->deleteObject(true);
1489 return SP_GROUP(doc->getObjectByRepr(grepr));
1490 }
1492 static void
1493 box3d_push_back_corner_pair(SPBox3D *box, std::list<std::pair<Geom::Point, Geom::Point> > &pts, int c1, int c2) {
1494 pts.push_back(std::make_pair(box3d_get_corner_screen(box, c1).to_2geom(),
1495 box3d_get_corner_screen(box, c2).to_2geom()));
1496 }
1498 void
1499 box3d_convert_to_guides(SPBox3D *box, bool write_undo) {
1500 if (prefs_get_int_attribute("tools.shapes.3dbox", "convertguides", 1) == 0) {
1501 sp_item_convert_to_guides(SP_ITEM(box));
1502 return;
1503 }
1505 SPDocument *doc = SP_OBJECT_DOCUMENT(box);
1506 //SPDesktop *desktop = inkscape_active_desktop();
1507 //Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
1509 std::list<std::pair<Geom::Point, Geom::Point> > pts;
1511 /* perspective lines in X direction */
1512 box3d_push_back_corner_pair(box, pts, 0, 1);
1513 box3d_push_back_corner_pair(box, pts, 2, 3);
1514 box3d_push_back_corner_pair(box, pts, 4, 5);
1515 box3d_push_back_corner_pair(box, pts, 6, 7);
1517 /* perspective lines in Y direction */
1518 box3d_push_back_corner_pair(box, pts, 0, 2);
1519 box3d_push_back_corner_pair(box, pts, 1, 3);
1520 box3d_push_back_corner_pair(box, pts, 4, 6);
1521 box3d_push_back_corner_pair(box, pts, 5, 7);
1523 /* perspective lines in Z direction */
1524 box3d_push_back_corner_pair(box, pts, 0, 4);
1525 box3d_push_back_corner_pair(box, pts, 1, 5);
1526 box3d_push_back_corner_pair(box, pts, 2, 6);
1527 box3d_push_back_corner_pair(box, pts, 3, 7);
1529 sp_guide_pt_pairs_to_guides(doc, pts);
1531 SP_OBJECT(box)->deleteObject(true);
1533 if (write_undo) {
1534 sp_document_done(doc, SP_VERB_CONTEXT_3DBOX, _("Convert to guides"));
1535 }
1536 }
1538 /*
1539 Local Variables:
1540 mode:c++
1541 c-file-style:"stroustrup"
1542 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1543 indent-tabs-mode:nil
1544 fill-column:99
1545 End:
1546 */
1547 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :