1 #define __SP_PATH_C__
3 /*
4 * SVG <path> implementation
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * David Turner <novalis@gnu.org>
9 *
10 * Copyright (C) 2004 David Turner
11 * Copyright (C) 1999-2002 Lauris Kaplinski
12 * Copyright (C) 2000-2001 Ximian, Inc.
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 */
17 #ifdef HAVE_CONFIG_H
18 # include <config.h>
19 #endif
21 #include <glibmm/i18n.h>
23 #include <display/curve.h>
24 #include <libnr/n-art-bpath.h>
25 #include <libnr/nr-path.h>
26 #include <libnr/nr-matrix-fns.h>
27 #include <2geom/pathvector.h>
29 #include "svg/svg.h"
30 #include "xml/repr.h"
31 #include "attributes.h"
33 #include "sp-path.h"
34 #include "sp-guide.h"
36 #include "document.h"
37 #include "desktop.h"
38 #include "desktop-handles.h"
39 #include "desktop-style.h"
40 #include "event-context.h"
41 #include "inkscape.h"
42 #include "style.h"
43 #include "message-stack.h"
44 #include "prefs-utils.h"
45 #include "selection.h"
47 #define noPATH_VERBOSE
49 static void sp_path_class_init(SPPathClass *klass);
50 static void sp_path_init(SPPath *path);
51 static void sp_path_finalize(GObject *obj);
52 static void sp_path_release(SPObject *object);
54 static void sp_path_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
55 static void sp_path_set(SPObject *object, unsigned key, gchar const *value);
57 static Inkscape::XML::Node *sp_path_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);
58 static NR::Matrix sp_path_set_transform(SPItem *item, NR::Matrix const &xform);
59 static gchar * sp_path_description(SPItem *item);
60 static void sp_path_convert_to_guides(SPItem *item);
62 static void sp_path_update(SPObject *object, SPCtx *ctx, guint flags);
63 static void sp_path_update_patheffect(SPLPEItem *lpeitem, bool write);
65 static SPShapeClass *parent_class;
67 /**
68 * Gets the GType object for SPPathClass
69 */
70 GType
71 sp_path_get_type(void)
72 {
73 static GType type = 0;
75 if (!type) {
76 GTypeInfo info = {
77 sizeof(SPPathClass),
78 NULL, NULL,
79 (GClassInitFunc) sp_path_class_init,
80 NULL, NULL,
81 sizeof(SPPath),
82 16,
83 (GInstanceInitFunc) sp_path_init,
84 NULL, /* value_table */
85 };
86 type = g_type_register_static(SP_TYPE_SHAPE, "SPPath", &info, (GTypeFlags)0);
87 }
88 return type;
89 }
91 /**
92 * Does the object-oriented work of initializing the class structure
93 * including parent class, and registers function pointers for
94 * the functions build, set, write, and set_transform.
95 */
96 static void
97 sp_path_class_init(SPPathClass * klass)
98 {
99 GObjectClass *gobject_class = (GObjectClass *) klass;
100 SPObjectClass *sp_object_class = (SPObjectClass *) klass;
101 SPItemClass *item_class = (SPItemClass *) klass;
102 SPLPEItemClass *lpe_item_class = (SPLPEItemClass *) klass;
104 parent_class = (SPShapeClass *)g_type_class_peek_parent(klass);
106 gobject_class->finalize = sp_path_finalize;
108 sp_object_class->build = sp_path_build;
109 sp_object_class->release = sp_path_release;
110 sp_object_class->set = sp_path_set;
111 sp_object_class->write = sp_path_write;
112 sp_object_class->update = sp_path_update;
114 item_class->description = sp_path_description;
115 item_class->set_transform = sp_path_set_transform;
116 item_class->convert_to_guides = sp_path_convert_to_guides;
118 lpe_item_class->update_patheffect = sp_path_update_patheffect;
119 }
122 gint
123 sp_nodes_in_path(SPPath *path)
124 {
125 SPCurve *curve = SP_SHAPE(path)->curve;
126 if (!curve)
127 return 0;
128 return curve->nodes_in_path();
129 }
131 static gchar *
132 sp_path_description(SPItem * item)
133 {
134 int count = sp_nodes_in_path(SP_PATH(item));
135 if (sp_lpe_item_has_path_effect(SP_LPE_ITEM(item))) {
136 return g_strdup_printf(ngettext("<b>Path</b> (%i node, path effect)",
137 "<b>Path</b> (%i nodes, path effect)",count), count);
138 } else {
139 return g_strdup_printf(ngettext("<b>Path</b> (%i node)",
140 "<b>Path</b> (%i nodes)",count), count);
141 }
142 }
144 static void
145 sp_path_convert_to_guides(SPItem *item)
146 {
147 SPPath *path = SP_PATH(item);
149 SPCurve *curve = SP_SHAPE(path)->curve;
150 if (!curve) return;
152 std::list<std::pair<Geom::Point, Geom::Point> > pts;
154 Geom::Matrix const i2d (sp_item_i2d_affine(SP_ITEM(path)));
156 Geom::PathVector const & pv = curve->get_pathvector();
157 for(Geom::PathVector::const_iterator pit = pv.begin(); pit != pv.end(); ++pit) {
158 for(Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_default(); ++cit) {
159 // only add curves for straight line segments
160 if( dynamic_cast<Geom::LineSegment const *>(&*cit) ||
161 dynamic_cast<Geom::HLineSegment const *>(&*cit) ||
162 dynamic_cast<Geom::VLineSegment const *>(&*cit) )
163 {
164 pts.push_back(std::make_pair(cit->initialPoint() * i2d, cit->finalPoint() * i2d));
165 }
166 }
167 }
169 SPDocument *doc = SP_OBJECT_DOCUMENT(path);
170 sp_guide_pt_pairs_to_guides(doc, pts);
171 }
173 /**
174 * Initializes an SPPath.
175 */
176 static void
177 sp_path_init(SPPath *path)
178 {
179 new (&path->connEndPair) SPConnEndPair(path);
181 path->original_curve = NULL;
182 }
184 static void
185 sp_path_finalize(GObject *obj)
186 {
187 SPPath *path = (SPPath *) obj;
189 path->connEndPair.~SPConnEndPair();
190 }
192 /**
193 * Given a repr, this sets the data items in the path object such as
194 * fill & style attributes, markers, and CSS properties.
195 */
196 static void
197 sp_path_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
198 {
199 /* Are these calls actually necessary? */
200 sp_object_read_attr(object, "marker");
201 sp_object_read_attr(object, "marker-start");
202 sp_object_read_attr(object, "marker-mid");
203 sp_object_read_attr(object, "marker-end");
205 sp_conn_end_pair_build(object);
207 if (((SPObjectClass *) parent_class)->build) {
208 ((SPObjectClass *) parent_class)->build(object, document, repr);
209 }
211 sp_object_read_attr(object, "inkscape:original-d");
212 sp_object_read_attr(object, "d");
214 /* d is a required attribute */
215 gchar const *d = sp_object_getAttribute(object, "d", NULL);
216 if (d == NULL) {
217 sp_object_set(object, sp_attribute_lookup("d"), "");
218 }
219 }
221 static void
222 sp_path_release(SPObject *object)
223 {
224 SPPath *path = SP_PATH(object);
226 path->connEndPair.release();
228 if (path->original_curve) {
229 path->original_curve = path->original_curve->unref();
230 }
232 if (((SPObjectClass *) parent_class)->release) {
233 ((SPObjectClass *) parent_class)->release(object);
234 }
235 }
237 /**
238 * Sets a value in the path object given by 'key', to 'value'. This is used
239 * for setting attributes and markers on a path object.
240 */
241 static void
242 sp_path_set(SPObject *object, unsigned int key, gchar const *value)
243 {
244 SPPath *path = (SPPath *) object;
246 switch (key) {
247 case SP_ATTR_INKSCAPE_ORIGINAL_D:
248 if (value) {
249 Geom::PathVector pv = sp_svg_read_pathv(value);
250 SPCurve *curve = new SPCurve(pv);
251 if (curve) {
252 sp_path_set_original_curve(path, curve, TRUE, true);
253 curve->unref();
254 }
255 } else {
256 sp_path_set_original_curve(path, NULL, TRUE, true);
257 }
258 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
259 break;
260 case SP_ATTR_D:
261 if (!sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(path))) {
262 if (value) {
263 Geom::PathVector pv = sp_svg_read_pathv(value);
264 SPCurve *curve = new SPCurve(pv);
265 if (curve) {
266 sp_shape_set_curve((SPShape *) path, curve, TRUE);
267 curve->unref();
268 }
269 } else {
270 sp_shape_set_curve((SPShape *) path, NULL, TRUE);
271 }
272 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
273 }
274 break;
275 case SP_PROP_MARKER:
276 case SP_PROP_MARKER_START:
277 case SP_PROP_MARKER_MID:
278 case SP_PROP_MARKER_END:
279 sp_shape_set_marker(object, key, value);
280 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
281 break;
282 case SP_ATTR_CONNECTOR_TYPE:
283 case SP_ATTR_CONNECTION_START:
284 case SP_ATTR_CONNECTION_END:
285 path->connEndPair.setAttr(key, value);
286 break;
287 default:
288 if (((SPObjectClass *) parent_class)->set) {
289 ((SPObjectClass *) parent_class)->set(object, key, value);
290 }
291 break;
292 }
293 }
295 /**
296 *
297 * Writes the path object into a Inkscape::XML::Node
298 */
299 static Inkscape::XML::Node *
300 sp_path_write(SPObject *object, Inkscape::XML::Document *xml_doc, Inkscape::XML::Node *repr, guint flags)
301 {
302 SPShape *shape = (SPShape *) object;
304 if ((flags & SP_OBJECT_WRITE_BUILD) && !repr) {
305 repr = xml_doc->createElement("svg:path");
306 }
308 if ( shape->curve != NULL ) {
309 gchar *str = sp_svg_write_path(shape->curve->get_pathvector());
310 repr->setAttribute("d", str);
311 g_free(str);
312 } else {
313 repr->setAttribute("d", NULL);
314 }
316 SPPath *path = (SPPath *) object;
317 if ( path->original_curve != NULL ) {
318 gchar *str = sp_svg_write_path(path->original_curve->get_pathvector());
319 repr->setAttribute("inkscape:original-d", str);
320 g_free(str);
321 } else {
322 repr->setAttribute("inkscape:original-d", NULL);
323 }
325 SP_PATH(shape)->connEndPair.writeRepr(repr);
327 if (((SPObjectClass *)(parent_class))->write) {
328 ((SPObjectClass *)(parent_class))->write(object, xml_doc, repr, flags);
329 }
331 return repr;
332 }
334 static void
335 sp_path_update(SPObject *object, SPCtx *ctx, guint flags)
336 {
337 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
338 flags &= ~SP_OBJECT_USER_MODIFIED_FLAG_B; // since we change the description, it's not a "just translation" anymore
339 }
341 if (((SPObjectClass *) parent_class)->update) {
342 ((SPObjectClass *) parent_class)->update(object, ctx, flags);
343 }
345 SPPath *path = SP_PATH(object);
346 path->connEndPair.update();
347 }
350 /**
351 * Writes the given transform into the repr for the given item.
352 */
353 static NR::Matrix
354 sp_path_set_transform(SPItem *item, NR::Matrix const &xform)
355 {
356 SPShape *shape = (SPShape *) item;
357 SPPath *path = (SPPath *) item;
359 if (!shape->curve) { // 0 nodes, nothing to transform
360 return NR::identity();
361 }
363 // Transform the original-d path or the (ordinary) path
364 if (path->original_curve) {
365 path->original_curve->transform(xform);
366 sp_lpe_item_update_patheffect(path, true, true);
367 } else {
368 shape->curve->transform(xform);
369 }
371 // Adjust stroke
372 sp_item_adjust_stroke(item, NR::expansion(xform));
374 // Adjust pattern fill
375 sp_item_adjust_pattern(item, xform);
377 // Adjust gradient fill
378 sp_item_adjust_gradient(item, xform);
380 // Adjust LPE
381 sp_item_adjust_livepatheffect(item, xform);
383 item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
385 // nothing remains - we've written all of the transform, so return identity
386 return NR::identity();
387 }
389 static void
390 sp_path_update_patheffect(SPLPEItem *lpeitem, bool write)
391 {
392 SPShape *shape = (SPShape *) lpeitem;
393 SPPath *path = (SPPath *) lpeitem;
394 if (path->original_curve) {
395 SPCurve *curve = path->original_curve->copy();
396 sp_shape_set_curve_insync(shape, curve, TRUE);
397 sp_lpe_item_perform_path_effect(SP_LPE_ITEM(shape), curve);
398 SP_OBJECT(shape)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
399 curve->unref();
401 if (write) {
402 // could also do SP_OBJECT(shape)->updateRepr(); but only the d attribute needs updating.
403 Inkscape::XML::Node *repr = SP_OBJECT_REPR(shape);
404 if ( shape->curve != NULL ) {
405 gchar *str = sp_svg_write_path(shape->curve->get_pathvector());
406 repr->setAttribute("d", str);
407 g_free(str);
408 } else {
409 repr->setAttribute("d", NULL);
410 }
411 }
412 } else {
414 }
415 }
418 /**
419 * Adds a original_curve to the path. If owner is specified, a reference
420 * will be made, otherwise the curve will be copied into the path.
421 * Any existing curve in the path will be unreferenced first.
422 * This routine triggers reapplication of an effect if present
423 * and also triggers a request to update the display. Does not write
424 * result to XML when write=false.
425 */
426 void
427 sp_path_set_original_curve (SPPath *path, SPCurve *curve, unsigned int owner, bool write)
428 {
429 if (path->original_curve) {
430 path->original_curve = path->original_curve->unref();
431 }
432 if (curve) {
433 if (owner) {
434 path->original_curve = curve->ref();
435 } else {
436 path->original_curve = curve->copy();
437 }
438 }
439 sp_lpe_item_update_patheffect(path, true, write);
440 SP_OBJECT(path)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
441 }
443 /**
444 * Return duplicate of original_curve (if any exists) or NULL if there is no curve
445 */
446 SPCurve *
447 sp_path_get_original_curve (SPPath *path)
448 {
449 if (path->original_curve) {
450 return path->original_curve->copy();
451 }
452 return NULL;
453 }
455 /**
456 * Return duplicate of edittable curve which is original_curve if it exists or
457 * shape->curve if not.
458 */
459 SPCurve*
460 sp_path_get_curve_for_edit (SPPath *path)
461 {
462 if (path->original_curve) {
463 return sp_path_get_original_curve(path);
464 } else {
465 return sp_shape_get_curve( (SPShape *) path );
466 }
467 }
469 /**
470 * Return a reference to original_curve if it exists or
471 * shape->curve if not.
472 */
473 const SPCurve*
474 sp_path_get_curve_reference (SPPath *path)
475 {
476 if (path->original_curve) {
477 return path->original_curve;
478 } else {
479 return path->curve;
480 }
481 }
483 /* Create a single dot represented by a circle */
484 void freehand_create_single_dot(SPEventContext *ec, NR::Point const &pt, char const *tool, guint event_state) {
485 g_return_if_fail(!strcmp(tool, "tools.freehand.pen") || !strcmp(tool, "tools.freehand.pencil"));
487 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
488 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
489 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
490 repr->setAttribute("sodipodi:type", "arc");
491 SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
492 Inkscape::GC::release(repr);
494 /* apply the tool's current style */
495 sp_desktop_apply_style_tool(desktop, repr, tool, false);
497 /* find out stroke width (TODO: is there an easier way??) */
498 double stroke_width = 3.0;
499 gchar const *style_str = NULL;
500 style_str = repr->attribute("style");
501 if (style_str) {
502 SPStyle *style = sp_style_new(SP_ACTIVE_DOCUMENT);
503 sp_style_merge_from_style_string(style, style_str);
504 stroke_width = style->stroke_width.computed;
505 style->stroke_width.computed = 0;
506 sp_style_unref(style);
507 }
508 /* unset stroke and set fill color to former stroke color */
509 gchar * str;
510 str = g_strdup_printf("fill:#%06x;stroke:none;", sp_desktop_get_color_tool(desktop, tool, false) >> 8);
511 repr->setAttribute("style", str);
512 g_free(str);
514 /* put the circle where the mouse click occurred and set the diameter to the
515 current stroke width, multiplied by the amount specified in the preferences */
516 NR::Matrix const i2d (from_2geom(sp_item_i2d_affine (item)));
517 NR::Point pp = pt * i2d;
518 double rad = 0.5 * prefs_get_double_attribute(tool, "dot-size", 3.0);
519 if (event_state & GDK_MOD1_MASK) {
520 /* TODO: We vary the dot size between 0.5*rad and 1.5*rad, where rad is the dot size
521 as specified in prefs. Very simple, but it might be sufficient in practice. If not,
522 we need to devise something more sophisticated. */
523 double s = g_random_double_range(-0.5, 0.5);
524 rad *= (1 + s);
525 }
526 if (event_state & GDK_SHIFT_MASK) {
527 // double the point size
528 rad *= 2;
529 }
531 sp_repr_set_svg_double (repr, "sodipodi:cx", pp[NR::X]);
532 sp_repr_set_svg_double (repr, "sodipodi:cy", pp[NR::Y]);
533 sp_repr_set_svg_double (repr, "sodipodi:rx", rad * stroke_width);
534 sp_repr_set_svg_double (repr, "sodipodi:ry", rad * stroke_width);
535 item->updateRepr();
537 sp_desktop_selection(desktop)->set(item);
539 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating single dot"));
540 sp_document_done(sp_desktop_document(desktop), SP_VERB_NONE, _("Create single dot"));
541 }
543 /*
544 Local Variables:
545 mode:c++
546 c-file-style:"stroustrup"
547 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
548 indent-tabs-mode:nil
549 fill-column:99
550 End:
551 */
552 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :