1 #define __SP_GRADIENT_CHEMISTRY_C__
3 /*
4 * Various utility methods for gradients
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak
9 * Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
10 *
11 * Copyright (C) 2007 Johan Engelen
12 * Copyright (C) 2001-2005 authors
13 * Copyright (C) 2001 Ximian, Inc.
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
19 #include "style.h"
20 #include "document-private.h"
21 #include "desktop-style.h"
23 #include "sp-gradient-reference.h"
24 #include "sp-gradient-vector.h"
25 #include "sp-linear-gradient.h"
26 #include "sp-radial-gradient.h"
27 #include "sp-stop.h"
28 #include "widgets/gradient-vector.h"
30 #include "sp-text.h"
31 #include "sp-tspan.h"
32 #include <libnr/nr-matrix-fns.h>
33 #include "xml/repr.h"
34 #include "svg/svg.h"
35 #include "svg/svg-color.h"
38 // Terminology:
39 //
40 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
41 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
42 //
43 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
44 // radial). It references a vector for the actual colors. Each private is only used by one
45 // object. It is either linear or radial.
47 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
49 SPGradient *
50 sp_gradient_ensure_vector_normalized(SPGradient *gr)
51 {
52 g_return_val_if_fail(gr != NULL, NULL);
53 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
55 /* If we are already normalized vector, just return */
56 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
57 /* Fail, if we have wrong state set */
58 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
59 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, SP_OBJECT_ID(gr));
60 return NULL;
61 }
63 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
64 if (!gr->has_stops) {
65 /* We do not have stops ourselves, so flatten stops as well */
66 sp_gradient_ensure_vector(gr);
67 g_assert(gr->vector.built);
68 // this adds stops from gr->vector as children to gr
69 sp_gradient_repr_write_vector (gr);
70 }
72 /* If gr hrefs some other gradient, remove the href */
73 if (gr->ref->getObject()) {
74 /* We are hrefing someone, so require flattening */
75 SP_OBJECT(gr)->updateRepr(((SPObject *) gr)->repr, SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
76 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
77 }
79 /* Everything is OK, set state flag */
80 gr->state = SP_GRADIENT_STATE_VECTOR;
81 return gr;
82 }
84 /**
85 * Creates new private gradient for the given vector
86 */
88 static SPGradient *
89 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
90 {
91 g_return_val_if_fail(document != NULL, NULL);
92 g_return_val_if_fail(vector != NULL, NULL);
93 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
94 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
96 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
98 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
99 // create a new private gradient of the requested type
100 Inkscape::XML::Node *repr;
101 if (type == SP_GRADIENT_TYPE_LINEAR) {
102 repr = xml_doc->createElement("svg:linearGradient");
103 } else {
104 repr = xml_doc->createElement("svg:radialGradient");
105 }
107 // privates are garbage-collectable
108 repr->setAttribute("inkscape:collect", "always");
110 // link to vector
111 sp_gradient_repr_set_link(repr, vector);
113 /* Append the new private gradient to defs */
114 SP_OBJECT_REPR(defs)->appendChild(repr);
115 Inkscape::GC::release(repr);
117 // get corresponding object
118 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
119 g_assert(gr != NULL);
120 g_assert(SP_IS_GRADIENT(gr));
122 return gr;
123 }
125 /**
126 Count how many times gr is used by the styles of o and its descendants
127 */
128 guint
129 count_gradient_hrefs(SPObject *o, SPGradient *gr)
130 {
131 if (!o)
132 return 1;
134 guint i = 0;
136 SPStyle *style = SP_OBJECT_STYLE(o);
137 if (style
138 && style->fill.type == SP_PAINT_TYPE_PAINTSERVER
139 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
140 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
141 {
142 i ++;
143 }
144 if (style
145 && style->stroke.type == SP_PAINT_TYPE_PAINTSERVER
146 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
147 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
148 {
149 i ++;
150 }
152 for (SPObject *child = sp_object_first_child(o);
153 child != NULL; child = SP_OBJECT_NEXT(child)) {
154 i += count_gradient_hrefs(child, gr);
155 }
157 return i;
158 }
161 /**
162 * If gr has other users, create a new private; also check if gr links to vector, relink if not
163 */
164 SPGradient *
165 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
166 SPGradientType type, SPObject *o)
167 {
168 g_return_val_if_fail(gr != NULL, NULL);
169 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
171 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
172 // but i think we should not abort on this - maybe just write a validity warning into some sort
173 // of log
174 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
175 return (gr);
177 // user is the object that uses this gradient; normally it's item but for tspans, we
178 // check its ancestor text so that tspans don't get different gradients from their
179 // texts.
180 SPObject *user = o;
181 while (SP_IS_TSPAN(user)) {
182 user = SP_OBJECT_PARENT(user);
183 }
185 // Check the number of uses of the gradient within this object;
186 // if we are private and there are no other users,
187 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
188 // check vector
189 if ( gr != vector && gr->ref->getObject() != vector ) {
190 /* our href is not the vector, and vector is different from gr; relink */
191 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
192 }
193 return gr;
194 }
196 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
197 SPObject *defs = SP_DOCUMENT_DEFS(doc);
199 if ((gr->has_stops) ||
200 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
201 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
202 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
203 // we have to clone a fresh new private gradient for the given vector
205 // create an empty one
206 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
208 // copy all the attributes to it
209 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
210 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
211 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
212 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
213 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
214 if (SP_IS_RADIALGRADIENT(gr)) {
215 repr_new->setAttribute("cx", repr->attribute("cx"));
216 repr_new->setAttribute("cy", repr->attribute("cy"));
217 repr_new->setAttribute("fx", repr->attribute("fx"));
218 repr_new->setAttribute("fy", repr->attribute("fy"));
219 repr_new->setAttribute("r", repr->attribute("r"));
220 } else {
221 repr_new->setAttribute("x1", repr->attribute("x1"));
222 repr_new->setAttribute("y1", repr->attribute("y1"));
223 repr_new->setAttribute("x2", repr->attribute("x2"));
224 repr_new->setAttribute("y2", repr->attribute("y2"));
225 }
227 return gr_new;
228 } else {
229 return gr;
230 }
231 }
233 SPGradient *
234 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
235 {
236 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
237 SPDocument *document = SP_OBJECT_DOCUMENT(gr);
239 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate();
240 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (document))->addChild(repr, NULL);
241 SPGradient *gr_new = (SPGradient *) document->getObjectByRepr(repr);
242 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
243 Inkscape::GC::release(repr);
244 return gr_new;
245 }
246 return gr;
247 }
249 /**
250 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
251 * instead. No forking or reapplying is done because this is only called for newly created privates.
252 * @return The new gradient.
253 */
254 SPGradient *
255 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
256 {
257 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
259 // calculate the bbox of the item
260 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
261 NR::Rect const bbox = item->invokeBbox(NR::identity()); // we need "true" bbox without item_i2d_affine
263 NR::Coord const width = bbox.dimensions()[NR::X];
264 NR::Coord const height = bbox.dimensions()[NR::Y];
265 g_assert(width > 0 && height > 0);
267 NR::Point const center = bbox.midpoint();
269 if (SP_IS_RADIALGRADIENT(gr)) {
270 sp_repr_set_svg_double(repr, "cx", center[NR::X]);
271 sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
272 sp_repr_set_svg_double(repr, "fx", center[NR::X]);
273 sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
274 sp_repr_set_svg_double(repr, "r", width/2);
276 // we want it to be elliptic, not circular
277 NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
278 NR::Matrix (NR::scale(1, height/width)) *
279 NR::Matrix (NR::translate (center));
281 gr->gradientTransform = squeeze;
282 {
283 gchar *c=sp_svg_transform_write(gr->gradientTransform);
284 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
285 g_free(c);
286 }
287 } else {
288 sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
289 sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
290 sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
291 sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
292 }
294 // set the gradientUnits
295 repr->setAttribute("gradientUnits", "userSpaceOnUse");
297 return gr;
298 }
300 /**
301 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
302 * @return The new gradient.
303 */
304 SPGradient *
305 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
306 {
307 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
309 // First, fork it if it is shared
310 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
311 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
313 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
315 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
317 // calculate the bbox of the item
318 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
319 NR::Rect const bbox = item->invokeBbox(NR::identity()); // we need "true" bbox without item_i2d_affine
320 NR::Matrix bbox2user(bbox.dimensions()[NR::X], 0,
321 0, bbox.dimensions()[NR::Y],
322 bbox.min()[NR::X], bbox.min()[NR::Y]);
324 /* skew is the additional transform, defined by the proportions of the item, that we need
325 * to apply to the gradient in order to work around this weird bit from SVG 1.1
326 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
327 *
328 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
329 * matrix, the stripes of the linear gradient are perpendicular to the gradient
330 * vector in object bounding box space (i.e., the abstract coordinate system where
331 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
332 * bottom/right of the object bounding box). When the object's bounding box is not
333 * square, the stripes that are conceptually perpendicular to the gradient vector
334 * within object bounding box space will render non-perpendicular relative to the
335 * gradient vector in user space due to application of the non-uniform scaling
336 * transformation from bounding box space to user space.
337 */
338 NR::Matrix skew = bbox2user;
339 double exp = skew.expansion();
340 skew[0] /= exp;
341 skew[1] /= exp;
342 skew[2] /= exp;
343 skew[3] /= exp;
344 skew[4] = 0;
345 skew[5] = 0;
347 // apply skew to the gradient
348 gr->gradientTransform = skew;
349 {
350 gchar *c=sp_svg_transform_write(gr->gradientTransform);
351 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
352 g_free(c);
353 }
355 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
356 // as to cancel it out when it's applied to the gradient during rendering
357 NR::Matrix point_convert = bbox2user * skew.inverse();
359 if (SP_IS_RADIALGRADIENT(gr)) {
360 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
362 // original points in the bbox coords
363 NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
364 NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
365 double r_b = rg->r.computed;
367 // converted points in userspace coords
368 NR::Point c_u = c_b * point_convert;
369 NR::Point f_u = f_b * point_convert;
370 double r_u = r_b * point_convert.expansion();
372 sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
373 sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
374 sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
375 sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
376 sp_repr_set_svg_double(repr, "r", r_u);
378 } else {
379 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
381 NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
382 NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
384 NR::Point p1_u = p1_b * point_convert;
385 NR::Point p2_u = p2_b * point_convert;
387 sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
388 sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
389 sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
390 sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
391 }
393 // set the gradientUnits
394 repr->setAttribute("gradientUnits", "userSpaceOnUse");
395 }
397 // apply the gradient to the item (may be necessary if we forked it); not recursive
398 // generally because grouped items will be taken care of later (we're being called
399 // from sp_item_adjust_paint_recursive); however text and all its children should all
400 // refer to one gradient, hence the recursive call for text (because we can't/don't
401 // want to access tspans and set gradients on them separately)
402 if (SP_IS_TEXT(item))
403 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
404 else
405 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
407 return gr;
408 }
410 void
411 sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
412 {
413 if (set) {
414 gradient->gradientTransform = postmul;
415 } else {
416 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
417 }
418 gradient->gradientTransform_set = TRUE;
420 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
421 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
422 g_free(c);
423 }
425 SPGradient *
426 sp_item_gradient (SPItem *item, bool fill_or_stroke)
427 {
428 SPStyle *style = SP_OBJECT_STYLE (item);
429 SPGradient *gradient = NULL;
431 if (fill_or_stroke) {
432 if (style && (style->fill.type == SP_PAINT_TYPE_PAINTSERVER)) {
433 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
434 if (SP_IS_GRADIENT (server)) {
435 gradient = SP_GRADIENT (server);
436 }
437 }
438 } else {
439 if (style && (style->stroke.type == SP_PAINT_TYPE_PAINTSERVER)) {
440 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
441 if (SP_IS_GRADIENT (server)) {
442 gradient = SP_GRADIENT (server);
443 }
444 }
445 }
447 return gradient;
448 }
451 SPStop*
452 sp_first_stop(SPGradient *gradient)
453 {
454 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
455 if (SP_IS_STOP (ochild))
456 return SP_STOP(ochild);
457 }
458 return NULL;
459 }
461 SPStop*
462 sp_prev_stop(SPStop *stop, SPGradient *gradient)
463 {
464 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
465 return NULL;
466 SPObject *found = NULL;
467 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
468 if (SP_IS_STOP (ochild)) {
469 found = ochild;
470 }
471 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
472 break;
473 }
474 }
475 return SP_STOP(found);
476 }
478 SPStop*
479 sp_next_stop(SPStop *stop)
480 {
481 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
482 if (SP_IS_STOP (ochild))
483 return SP_STOP(ochild);
484 }
485 return NULL;
486 }
488 SPStop*
489 sp_last_stop(SPGradient *gradient)
490 {
491 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
492 if (sp_next_stop (stop) == NULL)
493 return stop;
494 }
495 return NULL;
496 }
498 SPStop*
499 sp_get_stop_i(SPGradient *gradient, guint stop_i)
500 {
501 SPStop *stop = sp_first_stop (gradient);
503 for (guint i=0; i < stop_i; i++) {
504 if (!stop) return NULL;
505 stop = sp_next_stop (stop);
506 }
508 return stop;
509 }
512 void
513 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
514 {
515 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
517 if (!gradient || !SP_IS_GRADIENT(gradient))
518 return;
520 SPGradient *vector = sp_gradient_get_vector (gradient, false);
521 switch (point_type) {
522 case POINT_LG_BEGIN:
523 case POINT_RG_CENTER:
524 case POINT_RG_FOCUS:
525 {
526 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
527 gtk_widget_show (dialog);
528 }
529 break;
531 case POINT_LG_END:
532 case POINT_RG_R1:
533 case POINT_RG_R2:
534 {
535 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
536 gtk_widget_show (dialog);
537 }
538 break;
540 case POINT_LG_MID:
541 case POINT_RG_MID1:
542 case POINT_RG_MID2:
543 {
544 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
545 gtk_widget_show (dialog);
546 }
547 break;
548 default:
549 break;
550 }
551 }
553 guint32
554 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
555 {
556 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
558 if (!gradient || !SP_IS_GRADIENT(gradient))
559 return 0;
561 SPGradient *vector = sp_gradient_get_vector (gradient, false);
563 if (!vector) // orphan!
564 return 0; // what else to do?
566 switch (point_type) {
567 case POINT_LG_BEGIN:
568 case POINT_RG_CENTER:
569 case POINT_RG_FOCUS:
570 {
571 SPStop *first = sp_first_stop (vector);
572 if (first) {
573 return sp_stop_get_rgba32(first);
574 }
575 }
576 break;
578 case POINT_LG_END:
579 case POINT_RG_R1:
580 case POINT_RG_R2:
581 {
582 SPStop *last = sp_last_stop (vector);
583 if (last) {
584 return sp_stop_get_rgba32(last);
585 }
586 }
587 break;
589 case POINT_LG_MID:
590 case POINT_RG_MID1:
591 case POINT_RG_MID2:
592 {
593 SPStop *stopi = sp_get_stop_i (vector, point_i);
594 if (stopi) {
595 return sp_stop_get_rgba32(stopi);
596 }
597 }
598 break;
600 default:
601 break;
602 }
603 return 0;
604 }
606 void
607 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
608 {
609 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
611 if (!gradient || !SP_IS_GRADIENT(gradient))
612 return;
614 SPGradient *vector = sp_gradient_get_vector (gradient, false);
616 if (!vector) // orphan!
617 return;
619 vector = sp_gradient_fork_vector_if_necessary (vector);
620 if ( gradient != vector && gradient->ref->getObject() != vector ) {
621 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
622 }
624 switch (point_type) {
625 case POINT_LG_BEGIN:
626 case POINT_RG_CENTER:
627 case POINT_RG_FOCUS:
628 {
629 SPStop *first = sp_first_stop (vector);
630 if (first) {
631 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
632 }
633 }
634 break;
636 case POINT_LG_END:
637 case POINT_RG_R1:
638 case POINT_RG_R2:
639 {
640 SPStop *last = sp_last_stop (vector);
641 if (last) {
642 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
643 }
644 }
645 break;
647 case POINT_LG_MID:
648 case POINT_RG_MID1:
649 case POINT_RG_MID2:
650 {
651 SPStop *stopi = sp_get_stop_i (vector, point_i);
652 if (stopi) {
653 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
654 }
655 }
656 break;
658 default:
659 break;
660 }
661 }
663 void
664 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
665 {
666 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
667 if (!gradient || !SP_IS_GRADIENT(gradient))
668 return;
670 SPGradient *vector = sp_gradient_get_vector (gradient, false);
671 if (!vector) // orphan!
672 return;
674 vector = sp_gradient_fork_vector_if_necessary (vector);
675 if ( gradient != vector && gradient->ref->getObject() != vector ) {
676 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
677 }
679 GSList *child_reprs = NULL;
680 GSList *child_objects = NULL;
681 std::vector<double> offsets;
682 for (SPObject *child = sp_object_first_child(vector);
683 child != NULL; child = SP_OBJECT_NEXT(child)) {
684 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
685 child_objects = g_slist_prepend (child_objects, child);
686 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
687 }
689 GSList *child_copies = NULL;
690 for (GSList *i = child_reprs; i != NULL; i = i->next) {
691 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
692 child_copies = g_slist_append (child_copies, repr->duplicate());
693 }
696 for (GSList *i = child_objects; i != NULL; i = i->next) {
697 SPObject *child = SP_OBJECT (i->data);
698 child->deleteObject();
699 }
701 std::vector<double>::iterator iter = offsets.end() - 1;
702 for (GSList *i = child_copies; i != NULL; i = i->next) {
703 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
704 vector->appendChildRepr(copy);
705 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
706 iter --;
707 Inkscape::GC::release(copy);
708 }
710 g_slist_free (child_reprs);
711 g_slist_free (child_copies);
712 g_slist_free (child_objects);
713 }
716 // FIXME: make general global function
717 static double
718 get_offset_between_points (NR::Point p, NR::Point begin, NR::Point end)
719 {
720 double length = NR::L2(end - begin);
721 NR::Point be = (end - begin) / length;
722 double r = NR::dot(p - begin, be);
724 if (r < 0.0) return 0.0;
725 if (r > length) return 1.0;
727 return (r / length);
728 }
731 /**
732 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
733 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
734 */
735 void
736 sp_item_gradient_set_coords (SPItem *item, guint point_type, guint point_i, NR::Point p_w, bool fill_or_stroke, bool write_repr, bool scale)
737 {
738 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
740 if (!gradient || !SP_IS_GRADIENT(gradient))
741 return;
743 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
745 NR::Matrix i2d = sp_item_i2d_affine (item);
746 NR::Point p = p_w * i2d.inverse();
747 p *= (gradient->gradientTransform).inverse();
748 // now p is in gradient's original coordinates
750 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
752 if (SP_IS_LINEARGRADIENT(gradient)) {
753 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
754 switch (point_type) {
755 case POINT_LG_BEGIN:
756 if (scale) {
757 lg->x2.computed += (lg->x1.computed - p[NR::X]);
758 lg->y2.computed += (lg->y1.computed - p[NR::Y]);
759 }
760 lg->x1.computed = p[NR::X];
761 lg->y1.computed = p[NR::Y];
762 if (write_repr) {
763 if (scale) {
764 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
765 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
766 }
767 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
768 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
769 } else {
770 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
771 }
772 break;
773 case POINT_LG_END:
774 if (scale) {
775 lg->x1.computed += (lg->x2.computed - p[NR::X]);
776 lg->y1.computed += (lg->y2.computed - p[NR::Y]);
777 }
778 lg->x2.computed = p[NR::X];
779 lg->y2.computed = p[NR::Y];
780 if (write_repr) {
781 if (scale) {
782 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
783 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
784 }
785 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
786 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
787 } else {
788 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
789 }
790 break;
791 case POINT_LG_MID:
792 {
793 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
794 double offset = get_offset_between_points (p, NR::Point(lg->x1.computed, lg->y1.computed), NR::Point(lg->x2.computed, lg->y2.computed));
795 lg->vector.stops.at(point_i).offset = offset;
796 SPGradient *vector = sp_gradient_get_vector (lg, false);
797 SPStop* stopi = sp_get_stop_i(vector, point_i);
798 stopi->offset = offset;
799 if (write_repr) {
800 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
801 } else {
802 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
803 }
804 }
805 break;
806 default:
807 break;
808 }
809 } else if (SP_IS_RADIALGRADIENT(gradient)) {
811 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
812 NR::Point c (rg->cx.computed, rg->cy.computed);
813 NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
814 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
815 // prevent setting a radius too close to the center
816 return;
817 }
818 NR::Matrix new_transform;
819 bool transform_set = false;
821 switch (point_type) {
822 case POINT_RG_CENTER:
823 rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
824 rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
825 rg->cx.computed = p[NR::X];
826 rg->cy.computed = p[NR::Y];
827 if (write_repr) {
828 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
829 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
830 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
831 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
832 } else {
833 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
834 }
835 break;
836 case POINT_RG_FOCUS:
837 rg->fx.computed = p[NR::X];
838 rg->fy.computed = p[NR::Y];
839 if (write_repr) {
840 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
841 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
842 } else {
843 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
844 }
845 break;
846 case POINT_RG_R1:
847 {
848 NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
849 double r1_angle = NR::atan2(r1_w - c_w);
850 double move_angle = NR::atan2(p_w - c_w) - r1_angle;
851 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
853 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
854 NR::Matrix (NR::rotate(-r1_angle)) *
855 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
856 NR::Matrix (NR::rotate(r1_angle)) *
857 NR::Matrix (NR::rotate(move_angle)) *
858 NR::Matrix (NR::translate (c_w));
860 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
861 transform_set = true;
863 break;
864 }
865 case POINT_RG_R2:
866 {
867 NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
868 double r2_angle = NR::atan2(r2_w - c_w);
869 double move_angle = NR::atan2(p_w - c_w) - r2_angle;
870 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
872 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
873 NR::Matrix (NR::rotate(-r2_angle)) *
874 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
875 NR::Matrix (NR::rotate(r2_angle)) *
876 NR::Matrix (NR::rotate(move_angle)) *
877 NR::Matrix (NR::translate (c_w));
879 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
880 transform_set = true;
882 break;
883 }
884 case POINT_RG_MID1:
885 {
886 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
887 NR::Point end = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
888 double offset = get_offset_between_points (p, start, end);
889 rg->vector.stops.at(point_i).offset = offset;
890 SPGradient *vector = sp_gradient_get_vector (rg, false);
891 SPStop* stopi = sp_get_stop_i(vector, point_i);
892 stopi->offset = offset;
893 if (write_repr) {
894 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
895 } else {
896 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
897 }
898 break;
899 }
900 case POINT_RG_MID2:
901 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
902 NR::Point end = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
903 double offset = get_offset_between_points (p, start, end);
904 rg->vector.stops.at(point_i).offset = offset;
905 SPGradient *vector = sp_gradient_get_vector (rg, false);
906 SPStop* stopi = sp_get_stop_i(vector, point_i);
907 stopi->offset = offset;
908 if (write_repr) {
909 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
910 } else {
911 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
912 }
913 break;
914 }
915 if (transform_set) {
916 gradient->gradientTransform = new_transform;
917 gradient->gradientTransform_set = TRUE;
918 if (write_repr) {
919 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
920 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
921 g_free(s);
922 } else {
923 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
924 }
925 }
926 }
927 }
929 SPGradient *
930 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
931 {
932 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
934 if (gradient)
935 return sp_gradient_get_vector (gradient, false);
936 return NULL;
937 }
939 SPGradientSpread
940 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
941 {
942 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
944 if (gradient)
945 return sp_gradient_get_spread (gradient);
946 return SP_GRADIENT_SPREAD_PAD;
947 }
950 /**
951 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
952 in desktop coordinates.
953 */
955 NR::Point
956 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
957 {
958 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
960 NR::Point p (0, 0);
962 if (!gradient)
963 return p;
965 if (SP_IS_LINEARGRADIENT(gradient)) {
966 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
967 switch (point_type) {
968 case POINT_LG_BEGIN:
969 p = NR::Point (lg->x1.computed, lg->y1.computed);
970 break;
971 case POINT_LG_END:
972 p = NR::Point (lg->x2.computed, lg->y2.computed);
973 break;
974 case POINT_LG_MID:
975 {
976 gdouble offset = lg->vector.stops.at(point_i).offset;
977 p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
978 }
979 break;
980 }
981 } else if (SP_IS_RADIALGRADIENT(gradient)) {
982 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
983 switch (point_type) {
984 case POINT_RG_CENTER:
985 p = NR::Point (rg->cx.computed, rg->cy.computed);
986 break;
987 case POINT_RG_FOCUS:
988 p = NR::Point (rg->fx.computed, rg->fy.computed);
989 break;
990 case POINT_RG_R1:
991 p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
992 break;
993 case POINT_RG_R2:
994 p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
995 break;
996 case POINT_RG_MID1:
997 {
998 gdouble offset = rg->vector.stops.at(point_i).offset;
999 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1000 }
1001 break;
1002 case POINT_RG_MID2:
1003 {
1004 gdouble offset = rg->vector.stops.at(point_i).offset;
1005 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1006 }
1007 break;
1008 }
1009 }
1011 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1012 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1013 NR::Rect const bbox = item->invokeBbox(NR::identity()); // we need "true" bbox without item_i2d_affine
1014 p *= NR::Matrix(bbox.dimensions()[NR::X], 0,
1015 0, bbox.dimensions()[NR::Y],
1016 bbox.min()[NR::X], bbox.min()[NR::Y]);
1017 }
1018 p *= NR::Matrix(gradient->gradientTransform) * sp_item_i2d_affine(item);
1019 return p;
1020 }
1023 /**
1024 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1025 * new private gradient, if needed.
1026 * gr has to be a normalized vector.
1027 */
1029 SPGradient *
1030 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1031 {
1032 g_return_val_if_fail(item != NULL, NULL);
1033 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1034 g_return_val_if_fail(gr != NULL, NULL);
1035 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1036 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1038 SPStyle *style = SP_OBJECT_STYLE(item);
1039 g_assert(style != NULL);
1041 guint style_type = is_fill? style->fill.type : style->stroke.type;
1042 SPPaintServer *ps = NULL;
1043 if (style_type == SP_PAINT_TYPE_PAINTSERVER)
1044 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1046 if (ps
1047 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1048 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1049 {
1051 /* Current fill style is the gradient of the required type */
1052 SPGradient *current = SP_GRADIENT(ps);
1054 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1056 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1057 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1059 // current is private and it's either used once, or all its uses are by children of item;
1060 // so just change its href to vector
1062 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1063 /* href is not the vector */
1064 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1065 }
1066 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1067 return current;
1069 } else {
1071 // the gradient is not private, or it is shared with someone else;
1072 // normalize it (this includes creating new private if necessary)
1073 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1075 g_return_val_if_fail(normalized != NULL, NULL);
1077 if (normalized != current) {
1079 /* We have to change object style here; recursive because this is used from
1080 * fill&stroke and must work for groups etc. */
1081 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1082 }
1083 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1084 return normalized;
1085 }
1087 } else {
1088 /* Current fill style is not a gradient or wrong type, so construct everything */
1089 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1090 constructed = sp_gradient_reset_to_userspace(constructed, item);
1091 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1092 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1093 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1094 return constructed;
1095 }
1096 }
1098 static void
1099 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1100 {
1101 g_return_if_fail(repr != NULL);
1102 g_return_if_fail(link != NULL);
1103 g_return_if_fail(SP_IS_GRADIENT(link));
1105 gchar *ref;
1106 if (link) {
1107 gchar const *id = SP_OBJECT_ID(link);
1108 size_t const len = strlen(id);
1109 ref = (gchar*) alloca(len + 2);
1110 *ref = '#';
1111 memcpy(ref + 1, id, len + 1);
1112 } else {
1113 ref = NULL;
1114 }
1116 repr->setAttribute("xlink:href", ref);
1117 }
1119 /*
1120 * Get default normalized gradient vector of document, create if there is none
1121 */
1123 SPGradient *
1124 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1125 {
1126 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1127 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1129 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1131 repr->setAttribute("inkscape:collect", "always");
1132 // set here, but removed when it's edited in the gradient editor
1133 // to further reduce clutter, we could
1134 // (1) here, search gradients by color and return what is found without duplication
1135 // (2) in fill & stroke, show only one copy of each gradient in list
1137 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1139 gchar b[64];
1140 sp_svg_write_color(b, 64, color);
1142 {
1143 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1144 stop->setAttribute("style", t);
1145 g_free(t);
1146 }
1148 stop->setAttribute("offset", "0");
1150 repr->appendChild(stop);
1151 Inkscape::GC::release(stop);
1153 stop = xml_doc->createElement("svg:stop");
1155 {
1156 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1157 stop->setAttribute("style", t);
1158 g_free(t);
1159 }
1161 stop->setAttribute("offset", "1");
1163 repr->appendChild(stop);
1164 Inkscape::GC::release(stop);
1166 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1167 Inkscape::GC::release(repr);
1169 /* fixme: This does not look like nice */
1170 SPGradient *gr;
1171 gr = (SPGradient *) document->getObjectByRepr(repr);
1172 g_assert(gr != NULL);
1173 g_assert(SP_IS_GRADIENT(gr));
1174 /* fixme: Maybe add extra sanity check here */
1175 gr->state = SP_GRADIENT_STATE_VECTOR;
1177 return gr;
1178 }
1180 /**
1181 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1182 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1183 */
1184 SPGradient *
1185 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1186 SPObject *const o, bool const is_fill)
1187 {
1188 guint32 rgba = 0;
1189 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1190 rgba = sp_desktop_get_color(desktop, is_fill);
1191 } else {
1192 // take the color of the object
1193 SPStyle const &style = *SP_OBJECT_STYLE(o);
1194 SPIPaint const &paint = ( is_fill
1195 ? style.fill
1196 : style.stroke );
1197 if (paint.type == SP_PAINT_TYPE_COLOR) {
1198 rgba = sp_color_get_rgba32_ualpha(&paint.value.color, 0xff);
1199 } else if (paint.type == SP_PAINT_TYPE_PAINTSERVER) {
1200 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1201 if (SP_IS_GRADIENT (server)) {
1202 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1203 } else {
1204 rgba = sp_desktop_get_color(desktop, is_fill);
1205 }
1206 } else {
1207 // if o doesn't use flat color, then take current color of the desktop.
1208 rgba = sp_desktop_get_color(desktop, is_fill);
1209 }
1210 }
1212 return sp_document_default_gradient_vector(doc, rgba);
1213 }
1216 SPGradient *
1217 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
1218 {
1219 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
1220 vector = sp_gradient_fork_vector_if_necessary (vector);
1221 if ( gradient != vector && gradient->ref->getObject() != vector ) {
1222 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
1223 }
1224 return vector;
1225 }
1227 /*
1228 Local Variables:
1229 mode:c++
1230 c-file-style:"stroustrup"
1231 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1232 indent-tabs-mode:nil
1233 fill-column:99
1234 End:
1235 */
1236 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :