1 #define __SP_3DBOX_C__
3 /*
4 * SVG <box3d> implementation
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 * Maximilian Albert <Anhalter42@gmx.de>
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 "svg/stringstream.h"
21 #include "box3d.h"
23 static void sp_3dbox_class_init(SP3DBoxClass *klass);
24 static void sp_3dbox_init(SP3DBox *box3d);
26 static void sp_3dbox_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
27 static void sp_3dbox_release (SPObject *object);
28 static void sp_3dbox_set(SPObject *object, unsigned int key, const gchar *value);
29 static void sp_3dbox_update(SPObject *object, SPCtx *ctx, guint flags);
30 static Inkscape::XML::Node *sp_3dbox_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
32 static gchar *sp_3dbox_description(SPItem *item);
34 //static void sp_3dbox_set_shape(SPShape *shape);
35 static void sp_3dbox_set_shape(SP3DBox *box3d);
37 static void sp_3dbox_update_corner_with_value_from_svg (SPObject *object, guint corner_id, const gchar *value);
38 static gchar * sp_3dbox_get_corner_coords_string (SP3DBox *box, guint id);
39 static std::pair<gdouble, gdouble> sp_3dbox_get_coord_pair_from_string (const gchar *);
41 static SPGroupClass *parent_class;
43 GType
44 sp_3dbox_get_type(void)
45 {
46 static GType type = 0;
48 if (!type) {
49 GTypeInfo info = {
50 sizeof(SP3DBoxClass),
51 NULL, /* base_init */
52 NULL, /* base_finalize */
53 (GClassInitFunc) sp_3dbox_class_init,
54 NULL, /* class_finalize */
55 NULL, /* class_data */
56 sizeof(SP3DBox),
57 16, /* n_preallocs */
58 (GInstanceInitFunc) sp_3dbox_init,
59 NULL, /* value_table */
60 };
61 type = g_type_register_static(SP_TYPE_GROUP, "SP3DBox", &info, (GTypeFlags) 0);
62 }
64 return type;
65 }
67 static void
68 sp_3dbox_class_init(SP3DBoxClass *klass)
69 {
70 SPObjectClass *sp_object_class = (SPObjectClass *) klass;
71 SPItemClass *item_class = (SPItemClass *) klass;
73 parent_class = (SPGroupClass *) g_type_class_ref(SP_TYPE_GROUP);
75 sp_object_class->build = sp_3dbox_build;
76 sp_object_class->set = sp_3dbox_set;
77 sp_object_class->write = sp_3dbox_write;
78 sp_object_class->update = sp_3dbox_update;
79 sp_object_class->release = sp_3dbox_release;
81 item_class->description = sp_3dbox_description;
82 }
84 static void
85 sp_3dbox_init(SP3DBox *box)
86 {
87 for (int i = 0; i < 8; ++i) box->corners[i] = NR::Point(0,0);
88 for (int i = 0; i < 6; ++i) box->faces[i] = NULL;
89 }
91 static void
92 sp_3dbox_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
93 {
94 if (((SPObjectClass *) (parent_class))->build) {
95 ((SPObjectClass *) (parent_class))->build(object, document, repr);
96 }
98 SP3DBox *box = SP_3DBOX (object);
100 Box3D::Perspective3D::current_perspective->add_box (box);
102 sp_object_read_attr(object, "inkscape:box3dcornerA");
103 sp_object_read_attr(object, "inkscape:box3dcornerB");
104 sp_object_read_attr(object, "inkscape:box3dcornerC");
106 // TODO: We create all faces in the beginning, but only the non-degenerate ones
107 // should be written to the svg representation later in sp_3dbox_write.
108 Box3D::Axis cur_plane, axis, dir1, dir2;
109 Box3D::FrontOrRear cur_pos;
110 for (int i = 0; i < 3; ++i) {
111 for (int j = 0; j < 2; ++j) {
112 cur_plane = Box3D::planes[i];
113 cur_pos = Box3D::face_positions[j];
114 // FIXME: The following code could theoretically be moved to
115 // the constructor of Box3DFace (but see the comment there).
116 axis = (cur_pos == Box3D::FRONT ? Box3D::NONE : Box3D::third_axis_direction (cur_plane));
117 dir1 = extract_first_axis_direction (cur_plane);
118 dir2 = extract_second_axis_direction (cur_plane);
120 box->faces[Box3D::face_to_int(cur_plane ^ cur_pos)] =
121 new Box3DFace (box, box->corners[axis], box->corners[axis ^ dir1],
122 box->corners[axis ^ dir1 ^ dir2], box->corners[axis ^ dir2],
123 cur_plane, cur_pos);
124 }
125 }
127 // Check whether the paths of the faces of the box need to be linked to existing paths in the
128 // document (e.g., after a 'redo' operation or after opening a file) and do so if necessary.
129 sp_3dbox_link_to_existing_paths (box, repr);
130 }
132 static void
133 sp_3dbox_release (SPObject *object)
134 {
135 SP3DBox *box = SP_3DBOX(object);
136 for (int i = 0; i < 6; ++i) {
137 if (box->faces[i]) {
138 delete box->faces[i]; // FIXME: Anything else to do? Do we need to clean up the face first?
139 }
140 }
142 // FIXME: We do not duplicate perspectives if they are the same for several boxes.
143 // Thus, don't delete the perspective when deleting a box but rather unlink the box from it.
144 Box3D::get_persp_of_box (box)->remove_box (box);
146 if (((SPObjectClass *) parent_class)->release) {
147 ((SPObjectClass *) parent_class)->release (object);
148 }
149 }
151 static void sp_3dbox_set(SPObject *object, unsigned int key, const gchar *value)
152 {
153 switch (key) {
154 case SP_ATTR_INKSCAPE_3DBOX_CORNER_A:
155 sp_3dbox_update_corner_with_value_from_svg (object, 2, value);
156 break;
157 case SP_ATTR_INKSCAPE_3DBOX_CORNER_B:
158 sp_3dbox_update_corner_with_value_from_svg (object, 1, value);
159 break;
160 case SP_ATTR_INKSCAPE_3DBOX_CORNER_C:
161 sp_3dbox_update_corner_with_value_from_svg (object, 5, value);
162 break;
163 default:
164 if (((SPObjectClass *) (parent_class))->set) {
165 ((SPObjectClass *) (parent_class))->set(object, key, value);
166 }
167 break;
168 }
169 }
171 static void
172 sp_3dbox_update(SPObject *object, SPCtx *ctx, guint flags)
173 {
174 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
175 SP3DBox *box = SP_3DBOX(object);
176 sp_3dbox_link_to_existing_paths (box, SP_OBJECT_REPR(object));
177 }
179 /* Invoke parent method */
180 if (((SPObjectClass *) (parent_class))->update)
181 ((SPObjectClass *) (parent_class))->update(object, ctx, flags);
182 }
186 static Inkscape::XML::Node *sp_3dbox_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
187 {
188 SP3DBox *box = SP_3DBOX(object);
189 // FIXME: How to handle other contexts???
190 // FIXME: Is tools_isactive(..) more recommended to check for the current context/tool?
191 if (!SP_IS_3DBOX_CONTEXT(inkscape_active_event_context()))
192 return repr;
194 if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
195 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_OBJECT_DOCUMENT(object));
196 repr = xml_doc->createElement("svg:g");
197 repr->setAttribute("sodipodi:type", "inkscape:3dbox");
198 /* Hook paths to the faces of the box */
199 for (int i = 0; i < 6; ++i) {
200 box->faces[i]->hook_path_to_3dbox();
201 }
202 }
204 for (int i = 0; i < 6; ++i) {
205 box->faces[i]->set_path_repr();
206 }
208 if (flags & SP_OBJECT_WRITE_EXT) {
209 gchar *coords;
210 coords = sp_3dbox_get_corner_coords_string (box, 2);
211 repr->setAttribute("inkscape:box3dcornerA", coords);
213 coords = sp_3dbox_get_corner_coords_string (box, 1);
214 repr->setAttribute("inkscape:box3dcornerB", coords);
216 coords = sp_3dbox_get_corner_coords_string (box, 5);
217 repr->setAttribute("inkscape:box3dcornerC", coords);
219 g_free ((void *) coords);
220 }
222 if (((SPObjectClass *) (parent_class))->write) {
223 ((SPObjectClass *) (parent_class))->write(object, repr, flags);
224 }
226 return repr;
227 }
229 static gchar *
230 sp_3dbox_description(SPItem *item)
231 {
232 g_return_val_if_fail(SP_IS_3DBOX(item), NULL);
234 return g_strdup(_("<b>3D Box</b>"));
235 }
237 void
238 sp_3dbox_position_set (SP3DBoxContext &bc)
239 {
240 SP3DBox *box3d = SP_3DBOX(bc.item);
242 sp_3dbox_set_shape(box3d);
244 // FIXME: Why does the following call not automatically update the children
245 // of box3d (which is an SPGroup, which should do this)?
246 //SP_OBJECT(box3d)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
248 /**
249 SP_OBJECT(box3d->path_face1)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
250 SP_OBJECT(box3d->path_face2)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
251 SP_OBJECT(box3d->path_face3)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
252 SP_OBJECT(box3d->path_face4)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
253 SP_OBJECT(box3d->path_face5)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
254 SP_OBJECT(box3d->path_face6)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
255 ***/
256 }
258 static void
259 // FIXME: Note that this is _not_ the virtual set_shape() method inherited from SPShape,
260 // since SP3DBox is inherited from SPGroup. The following method is "artificially"
261 // called from sp_3dbox_update().
262 //sp_3dbox_set_shape(SPShape *shape)
263 sp_3dbox_set_shape(SP3DBox *box3d)
264 {
265 // FIXME: How to handle other contexts???
266 // FIXME: Is tools_isactive(..) more recommended to check for the current context/tool?
267 if (!SP_IS_3DBOX_CONTEXT(inkscape_active_event_context()))
268 return;
269 SP3DBoxContext *bc = SP_3DBOX_CONTEXT(inkscape_active_event_context());
271 /* Only update the curves during dragging; setting the svg representations
272 is expensive and only done once at the end */
273 sp_3dbox_recompute_corners (box3d, bc->drag_origin, bc->drag_ptB, bc->drag_ptC);
274 if (bc->extruded) {
275 box3d->faces[0]->set_corners (box3d->corners[0], box3d->corners[4], box3d->corners[6], box3d->corners[2]);
276 box3d->faces[1]->set_corners (box3d->corners[1], box3d->corners[5], box3d->corners[7], box3d->corners[3]);
277 box3d->faces[2]->set_corners (box3d->corners[0], box3d->corners[1], box3d->corners[5], box3d->corners[4]);
278 box3d->faces[3]->set_corners (box3d->corners[2], box3d->corners[3], box3d->corners[7], box3d->corners[6]);
279 box3d->faces[5]->set_corners (box3d->corners[4], box3d->corners[5], box3d->corners[7], box3d->corners[6]);
280 }
281 box3d->faces[4]->set_corners (box3d->corners[0], box3d->corners[1], box3d->corners[3], box3d->corners[2]);
283 sp_3dbox_update_curves (box3d);
284 }
287 void sp_3dbox_recompute_corners (SP3DBox *box, NR::Point const A, NR::Point const B, NR::Point const C)
288 {
289 sp_3dbox_move_corner_in_XY_plane (box, 2, A);
290 sp_3dbox_move_corner_in_XY_plane (box, 1, B);
291 sp_3dbox_move_corner_in_Z_direction (box, 5, C);
292 }
294 void
295 sp_3dbox_update_curves (SP3DBox *box) {
296 for (int i = 0; i < 6; ++i) {
297 if (box->faces[i]) box->faces[i]->set_curve();
298 }
299 }
301 /**
302 * In some situations (e.g., after cloning boxes, undo & redo, or reading boxes from a file) there are
303 * paths already present in the document which correspond to the faces of newly created boxes, but their
304 * 'path' members don't link to them yet. The following function corrects this if necessary.
305 */
306 void
307 sp_3dbox_link_to_existing_paths (SP3DBox *box, Inkscape::XML::Node *repr) {
308 // TODO: We should probably destroy the existing paths and recreate them because we don't know
309 // precisely which path corresponds to which face. Does this make a difference?
310 // In sp_3dbox_write we write the correct paths anyway, don't we? But we could get into
311 // trouble at a later stage when we only write single faces for degenerate boxes.
313 SPDocument *document = SP_OBJECT_DOCUMENT(box);
314 guint face_id = 0;
316 for (Inkscape::XML::Node *i = sp_repr_children(repr); i != NULL; i = sp_repr_next(i)) {
317 if (face_id > 5) {
318 g_warning ("SVG representation of 3D boxes must contain 6 paths or less.\n");
319 break;
320 }
322 SPObject *face_object = document->getObjectByRepr((Inkscape::XML::Node *) i);
323 if (!SP_IS_PATH(face_object)) {
324 g_warning ("SVG representation of 3D boxes should only contain paths.\n");
325 continue;
326 }
327 box->faces[face_id]->hook_path_to_3dbox(SP_PATH(face_object));
328 ++face_id;
329 }
330 if (face_id < 6) {
331 //g_warning ("SVG representation of 3D boxes should contain exactly 6 paths (degenerate boxes are not yet supported).\n");
332 // TODO: Check whether it is safe to add the remaining paths to the box and do so in case it is.
333 // (But we also land here for newly created boxes where we shouldn't add any paths because
334 // This is done in sp_3dbox_write later on.
335 }
336 }
338 void
339 sp_3dbox_move_corner_in_XY_plane (SP3DBox *box, guint id, NR::Point pt, Box3D::Axis axes)
340 {
341 Box3D::Perspective3D * persp = Box3D::get_persp_of_box (box);
343 NR::Point A (box->corners[id ^ Box3D::XY]);
344 if (Box3D::is_single_axis_direction (axes)) {
345 pt = Box3D::PerspectiveLine (box->corners[id], axes, persp).closest_to(pt);
346 }
348 /* set the 'front' corners */
349 box->corners[id] = pt;
351 Box3D::PerspectiveLine pl_one (A, Box3D::Y, persp);
352 Box3D::PerspectiveLine pl_two (pt, Box3D::X, persp);
353 box->corners[id ^ Box3D::X] = pl_one.meet(pl_two);
355 pl_one = Box3D::PerspectiveLine (A, Box3D::X, persp);
356 pl_two = Box3D::PerspectiveLine (pt, Box3D::Y, persp);
357 box->corners[id ^ Box3D::Y] = pl_one.meet(pl_two);
359 /* set the 'rear' corners */
360 NR::Point B (box->corners[id ^ Box3D::XYZ]);
362 pl_one = Box3D::PerspectiveLine (box->corners[id ^ Box3D::X], Box3D::Z, persp);
363 pl_two = Box3D::PerspectiveLine (B, Box3D::Y, persp);
364 box->corners[id ^ Box3D::XZ] = pl_one.meet(pl_two);
366 pl_one = Box3D::PerspectiveLine (box->corners[id ^ Box3D::XZ], Box3D::X, persp);
367 pl_two = Box3D::PerspectiveLine (pt, Box3D::Z, persp);
368 box->corners[id ^ Box3D::Z] = pl_one.meet(pl_two);
370 pl_one = Box3D::PerspectiveLine (box->corners[id ^ Box3D::Z], Box3D::Y, persp);
371 pl_two = Box3D::PerspectiveLine (B, Box3D::X, persp);
372 box->corners[id ^ Box3D::YZ] = pl_one.meet(pl_two);
374 }
376 void
377 sp_3dbox_move_corner_in_Z_direction (SP3DBox *box, guint id, NR::Point pt, bool constrained)
378 {
379 if (!constrained) sp_3dbox_move_corner_in_XY_plane (box, id, pt, Box3D::XY);
381 Box3D::Perspective3D * persp = Box3D::get_persp_of_box (box);
383 /* set the four corners of the face containing corners[id] */
384 box->corners[id] = Box3D::PerspectiveLine (box->corners[id], Box3D::Z, persp).closest_to(pt);
386 Box3D::PerspectiveLine pl_one (box->corners[id], Box3D::X, persp);
387 Box3D::PerspectiveLine pl_two (box->corners[id ^ Box3D::XZ], Box3D::Z, persp);
388 box->corners[id ^ Box3D::X] = pl_one.meet(pl_two);
390 pl_one = Box3D::PerspectiveLine (box->corners[id ^ Box3D::X], Box3D::Y, persp);
391 pl_two = Box3D::PerspectiveLine (box->corners[id ^ Box3D::XYZ], Box3D::Z, persp);
392 box->corners[id ^ Box3D::XY] = pl_one.meet(pl_two);
394 pl_one = Box3D::PerspectiveLine (box->corners[id], Box3D::Y, persp);
395 pl_two = Box3D::PerspectiveLine (box->corners[id ^ Box3D::YZ], Box3D::Z, persp);
396 box->corners[id ^ Box3D::Y] = pl_one.meet(pl_two);
397 }
399 NR::Maybe<NR::Point>
400 sp_3dbox_get_center (SP3DBox *box)
401 {
402 return sp_3dbox_get_midpoint_between_corners (box, 0, 7);
403 }
405 NR::Maybe<NR::Point>
406 sp_3dbox_get_midpoint_between_corners (SP3DBox *box, guint id_corner1, guint id_corner2)
407 {
408 Box3D::Axis corner_axes = (Box3D::Axis) (id_corner1 ^ id_corner2);
410 // Is all this sufficiently precise also for degenerate cases?
411 if (sp_3dbox_corners_are_adjacent (id_corner1, id_corner2)) {
412 Box3D::Axis orth_dir = get_perpendicular_axis_direction (corner_axes);
414 Box3D::Line diag1 (box->corners[id_corner1], box->corners[id_corner2 ^ orth_dir]);
415 Box3D::Line diag2 (box->corners[id_corner1 ^ orth_dir], box->corners[id_corner2]);
416 NR::Maybe<NR::Point> adjacent_face_center = diag1.intersect(diag2);
418 if (!adjacent_face_center) return NR::Nothing();
420 Box3D::Perspective3D * persp = Box3D::get_persp_of_box (box);
422 Box3D::PerspectiveLine pl (*adjacent_face_center, orth_dir, persp);
423 return pl.intersect(Box3D::PerspectiveLine(box->corners[id_corner1], corner_axes, persp));
424 } else {
425 Box3D::Axis dir = Box3D::extract_first_axis_direction (corner_axes);
426 Box3D::Line diag1 (box->corners[id_corner1], box->corners[id_corner2]);
427 Box3D::Line diag2 (box->corners[id_corner1 ^ dir], box->corners[id_corner2 ^ dir]);
428 return diag1.intersect(diag2);
429 }
430 }
432 static gchar *
433 sp_3dbox_get_corner_coords_string (SP3DBox *box, guint id)
434 {
435 id = id % 8;
436 Inkscape::SVGOStringStream os;
437 os << box->corners[id][NR::X] << "," << box->corners[id][NR::Y];
438 return g_strdup(os.str().c_str());
439 }
441 static std::pair<gdouble, gdouble>
442 sp_3dbox_get_coord_pair_from_string (const gchar *coords)
443 {
444 gchar **coordpair = g_strsplit( coords, ",", 0);
445 // We might as well rely on g_ascii_strtod to convert the NULL pointer to 0.0,
446 // but we include the following test anyway
447 if (coordpair[0] == NULL || coordpair[1] == NULL) {
448 g_strfreev (coordpair);
449 g_warning ("Coordinate conversion failed.\n");
450 return std::make_pair(0.0, 0.0);
451 }
453 gdouble coord1 = g_ascii_strtod(coordpair[0], NULL);
454 gdouble coord2 = g_ascii_strtod(coordpair[1], NULL);
455 g_strfreev (coordpair);
457 return std::make_pair(coord1, coord2);
458 }
460 // auxiliary function
461 static void
462 sp_3dbox_update_corner_with_value_from_svg (SPObject *object, guint corner_id, const gchar *value)
463 {
464 if (value == NULL) return;
465 SP3DBox *box = SP_3DBOX(object);
467 std::pair<gdouble, gdouble> coord_pair = sp_3dbox_get_coord_pair_from_string (value);
468 box->corners[corner_id] = NR::Point (coord_pair.first, coord_pair.second);
469 sp_3dbox_recompute_corners (box, box->corners[2], box->corners[1], box->corners[5]);
470 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
471 }
473 /*
474 Local Variables:
475 mode:c++
476 c-file-style:"stroustrup"
477 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
478 indent-tabs-mode:nil
479 fill-column:99
480 End:
481 */
482 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :