59a22756e9ea38ebd4f0b6cb0e365de47a3599c2
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 <libnr/nr-point-fns.h>
34 #include <libnr/nr-matrix-ops.h>
35 #include <libnr/nr-rotate-ops.h>
36 #include <2geom/transforms.h>
37 #include "xml/repr.h"
38 #include "svg/svg.h"
39 #include "svg/svg-color.h"
40 #include "svg/css-ostringstream.h"
41 #include "preferences.h"
44 // Terminology:
45 //
46 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
47 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
48 //
49 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
50 // radial). It references a vector for the actual colors. Each private is only used by one
51 // object. It is either linear or radial.
53 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
55 SPGradient *
56 sp_gradient_ensure_vector_normalized(SPGradient *gr)
57 {
58 g_return_val_if_fail(gr != NULL, NULL);
59 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
61 /* If we are already normalized vector, just return */
62 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
63 /* Fail, if we have wrong state set */
64 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
65 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, gr->getId());
66 return NULL;
67 }
69 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
70 if (!gr->has_stops) {
71 /* We do not have stops ourselves, so flatten stops as well */
72 sp_gradient_ensure_vector(gr);
73 g_assert(gr->vector.built);
74 // this adds stops from gr->vector as children to gr
75 sp_gradient_repr_write_vector (gr);
76 }
78 /* If gr hrefs some other gradient, remove the href */
79 if (gr->ref->getObject()) {
80 /* We are hrefing someone, so require flattening */
81 SP_OBJECT(gr)->updateRepr(SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
82 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
83 }
85 /* Everything is OK, set state flag */
86 gr->state = SP_GRADIENT_STATE_VECTOR;
87 return gr;
88 }
90 /**
91 * Creates new private gradient for the given vector
92 */
94 static SPGradient *
95 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
96 {
97 g_return_val_if_fail(document != NULL, NULL);
98 g_return_val_if_fail(vector != NULL, NULL);
99 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
100 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
102 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
104 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
105 // create a new private gradient of the requested type
106 Inkscape::XML::Node *repr;
107 if (type == SP_GRADIENT_TYPE_LINEAR) {
108 repr = xml_doc->createElement("svg:linearGradient");
109 } else {
110 repr = xml_doc->createElement("svg:radialGradient");
111 }
113 // privates are garbage-collectable
114 repr->setAttribute("inkscape:collect", "always");
116 // link to vector
117 sp_gradient_repr_set_link(repr, vector);
119 /* Append the new private gradient to defs */
120 SP_OBJECT_REPR(defs)->appendChild(repr);
121 Inkscape::GC::release(repr);
123 // get corresponding object
124 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
125 g_assert(gr != NULL);
126 g_assert(SP_IS_GRADIENT(gr));
128 return gr;
129 }
131 /**
132 Count how many times gr is used by the styles of o and its descendants
133 */
134 guint
135 count_gradient_hrefs(SPObject *o, SPGradient *gr)
136 {
137 if (!o)
138 return 1;
140 guint i = 0;
142 SPStyle *style = SP_OBJECT_STYLE(o);
143 if (style
144 && style->fill.isPaintserver()
145 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
146 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
147 {
148 i ++;
149 }
150 if (style
151 && style->stroke.isPaintserver()
152 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
153 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
154 {
155 i ++;
156 }
158 for (SPObject *child = sp_object_first_child(o);
159 child != NULL; child = SP_OBJECT_NEXT(child)) {
160 i += count_gradient_hrefs(child, gr);
161 }
163 return i;
164 }
167 /**
168 * If gr has other users, create a new private; also check if gr links to vector, relink if not
169 */
170 SPGradient *
171 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
172 SPGradientType type, SPObject *o)
173 {
174 g_return_val_if_fail(gr != NULL, NULL);
175 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
177 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
178 // but i think we should not abort on this - maybe just write a validity warning into some sort
179 // of log
180 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
181 return (gr);
183 // user is the object that uses this gradient; normally it's item but for tspans, we
184 // check its ancestor text so that tspans don't get different gradients from their
185 // texts.
186 SPObject *user = o;
187 while (SP_IS_TSPAN(user)) {
188 user = SP_OBJECT_PARENT(user);
189 }
191 // Check the number of uses of the gradient within this object;
192 // if we are private and there are no other users,
193 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
194 // check vector
195 if ( gr != vector && gr->ref->getObject() != vector ) {
196 /* our href is not the vector, and vector is different from gr; relink */
197 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
198 }
199 return gr;
200 }
202 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
203 SPObject *defs = SP_DOCUMENT_DEFS(doc);
205 if ((gr->has_stops) ||
206 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
207 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
208 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
209 // we have to clone a fresh new private gradient for the given vector
211 // create an empty one
212 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
214 // copy all the attributes to it
215 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
216 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
217 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
218 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
219 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
220 if (SP_IS_RADIALGRADIENT(gr)) {
221 repr_new->setAttribute("cx", repr->attribute("cx"));
222 repr_new->setAttribute("cy", repr->attribute("cy"));
223 repr_new->setAttribute("fx", repr->attribute("fx"));
224 repr_new->setAttribute("fy", repr->attribute("fy"));
225 repr_new->setAttribute("r", repr->attribute("r"));
226 } else {
227 repr_new->setAttribute("x1", repr->attribute("x1"));
228 repr_new->setAttribute("y1", repr->attribute("y1"));
229 repr_new->setAttribute("x2", repr->attribute("x2"));
230 repr_new->setAttribute("y2", repr->attribute("y2"));
231 }
233 return gr_new;
234 } else {
235 return gr;
236 }
237 }
239 SPGradient *
240 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
241 {
242 // Some people actually prefer their gradient vectors to be shared...
243 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
244 if (!prefs->getBool("/options/forkgradientvectors/value", true))
245 return gr;
247 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
248 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
249 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
251 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate(xml_doc);
252 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (doc))->addChild(repr, NULL);
253 SPGradient *gr_new = (SPGradient *) doc->getObjectByRepr(repr);
254 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
255 Inkscape::GC::release(repr);
256 return gr_new;
257 }
258 return gr;
259 }
261 /**
262 * Obtain the vector from the gradient. A forked vector will be created and linked to this gradient if another gradient uses it.
263 */
264 SPGradient *
265 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
266 {
267 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
268 vector = sp_gradient_fork_vector_if_necessary (vector);
269 if ( gradient != vector && gradient->ref->getObject() != vector ) {
270 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
271 }
272 return vector;
273 }
276 /**
277 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
278 * instead. No forking or reapplying is done because this is only called for newly created privates.
279 * @return The new gradient.
280 */
281 SPGradient *
282 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
283 {
284 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
286 // calculate the bbox of the item
287 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
288 Geom::OptRect bbox = item->getBounds(Geom::identity()); // we need "true" bbox without item_i2d_affine
290 if (!bbox)
291 return gr;
293 Geom::Coord const width = bbox->dimensions()[Geom::X];
294 Geom::Coord const height = bbox->dimensions()[Geom::Y];
296 Geom::Point const center = bbox->midpoint();
298 if (SP_IS_RADIALGRADIENT(gr)) {
299 sp_repr_set_svg_double(repr, "cx", center[Geom::X]);
300 sp_repr_set_svg_double(repr, "cy", center[Geom::Y]);
301 sp_repr_set_svg_double(repr, "fx", center[Geom::X]);
302 sp_repr_set_svg_double(repr, "fy", center[Geom::Y]);
303 sp_repr_set_svg_double(repr, "r", width/2);
305 // we want it to be elliptic, not circular
306 Geom::Matrix squeeze = Geom::Translate (-center) *
307 Geom::Scale(1, height/width) *
308 Geom::Translate (center);
310 gr->gradientTransform = squeeze;
311 {
312 gchar *c=sp_svg_transform_write(gr->gradientTransform);
313 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
314 g_free(c);
315 }
316 } else {
317 sp_repr_set_svg_double(repr, "x1", (center - Geom::Point(width/2, 0))[Geom::X]);
318 sp_repr_set_svg_double(repr, "y1", (center - Geom::Point(width/2, 0))[Geom::Y]);
319 sp_repr_set_svg_double(repr, "x2", (center + Geom::Point(width/2, 0))[Geom::X]);
320 sp_repr_set_svg_double(repr, "y2", (center + Geom::Point(width/2, 0))[Geom::Y]);
321 }
323 // set the gradientUnits
324 repr->setAttribute("gradientUnits", "userSpaceOnUse");
326 return gr;
327 }
329 /**
330 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
331 * @return The new gradient.
332 */
333 SPGradient *
334 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
335 {
336 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
338 // First, fork it if it is shared
339 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
340 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
342 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
344 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
346 // calculate the bbox of the item
347 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
348 Geom::Matrix bbox2user;
349 Geom::OptRect bbox = item->getBounds(Geom::identity()); // we need "true" bbox without item_i2d_affine
350 if ( bbox ) {
351 bbox2user = Geom::Matrix(bbox->dimensions()[Geom::X], 0,
352 0, bbox->dimensions()[Geom::Y],
353 bbox->min()[Geom::X], bbox->min()[Geom::Y]);
354 } else {
355 // would be degenerate otherwise
356 bbox2user = Geom::identity();
357 }
359 /* skew is the additional transform, defined by the proportions of the item, that we need
360 * to apply to the gradient in order to work around this weird bit from SVG 1.1
361 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
362 *
363 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
364 * matrix, the stripes of the linear gradient are perpendicular to the gradient
365 * vector in object bounding box space (i.e., the abstract coordinate system where
366 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
367 * bottom/right of the object bounding box). When the object's bounding box is not
368 * square, the stripes that are conceptually perpendicular to the gradient vector
369 * within object bounding box space will render non-perpendicular relative to the
370 * gradient vector in user space due to application of the non-uniform scaling
371 * transformation from bounding box space to user space.
372 */
373 Geom::Matrix skew = bbox2user;
374 double exp = skew.descrim();
375 skew[0] /= exp;
376 skew[1] /= exp;
377 skew[2] /= exp;
378 skew[3] /= exp;
379 skew[4] = 0;
380 skew[5] = 0;
382 // apply skew to the gradient
383 gr->gradientTransform = skew;
384 {
385 gchar *c=sp_svg_transform_write(gr->gradientTransform);
386 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
387 g_free(c);
388 }
390 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
391 // as to cancel it out when it's applied to the gradient during rendering
392 Geom::Matrix point_convert = bbox2user * skew.inverse();
394 if (SP_IS_RADIALGRADIENT(gr)) {
395 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
397 // original points in the bbox coords
398 Geom::Point c_b = Geom::Point(rg->cx.computed, rg->cy.computed);
399 Geom::Point f_b = Geom::Point(rg->fx.computed, rg->fy.computed);
400 double r_b = rg->r.computed;
402 // converted points in userspace coords
403 Geom::Point c_u = c_b * point_convert;
404 Geom::Point f_u = f_b * point_convert;
405 double r_u = r_b * point_convert.descrim();
407 sp_repr_set_svg_double(repr, "cx", c_u[Geom::X]);
408 sp_repr_set_svg_double(repr, "cy", c_u[Geom::Y]);
409 sp_repr_set_svg_double(repr, "fx", f_u[Geom::X]);
410 sp_repr_set_svg_double(repr, "fy", f_u[Geom::Y]);
411 sp_repr_set_svg_double(repr, "r", r_u);
413 } else {
414 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
416 Geom::Point p1_b = Geom::Point(lg->x1.computed, lg->y1.computed);
417 Geom::Point p2_b = Geom::Point(lg->x2.computed, lg->y2.computed);
419 Geom::Point p1_u = p1_b * point_convert;
420 Geom::Point p2_u = p2_b * point_convert;
422 sp_repr_set_svg_double(repr, "x1", p1_u[Geom::X]);
423 sp_repr_set_svg_double(repr, "y1", p1_u[Geom::Y]);
424 sp_repr_set_svg_double(repr, "x2", p2_u[Geom::X]);
425 sp_repr_set_svg_double(repr, "y2", p2_u[Geom::Y]);
426 }
428 // set the gradientUnits
429 repr->setAttribute("gradientUnits", "userSpaceOnUse");
430 }
432 // apply the gradient to the item (may be necessary if we forked it); not recursive
433 // generally because grouped items will be taken care of later (we're being called
434 // from sp_item_adjust_paint_recursive); however text and all its children should all
435 // refer to one gradient, hence the recursive call for text (because we can't/don't
436 // want to access tspans and set gradients on them separately)
437 if (SP_IS_TEXT(item))
438 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
439 else
440 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
442 return gr;
443 }
445 void
446 sp_gradient_transform_multiply(SPGradient *gradient, Geom::Matrix postmul, bool set)
447 {
448 if (set) {
449 gradient->gradientTransform = postmul;
450 } else {
451 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
452 }
453 gradient->gradientTransform_set = TRUE;
455 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
456 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
457 g_free(c);
458 }
460 SPGradient *
461 sp_item_gradient (SPItem *item, bool fill_or_stroke)
462 {
463 SPStyle *style = SP_OBJECT_STYLE (item);
464 SPGradient *gradient = NULL;
466 if (fill_or_stroke) {
467 if (style && (style->fill.isPaintserver())) {
468 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
469 if (SP_IS_GRADIENT (server)) {
470 gradient = SP_GRADIENT (server);
471 }
472 }
473 } else {
474 if (style && (style->stroke.isPaintserver())) {
475 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
476 if (SP_IS_GRADIENT (server)) {
477 gradient = SP_GRADIENT (server);
478 }
479 }
480 }
482 return gradient;
483 }
486 SPStop*
487 sp_first_stop(SPGradient *gradient)
488 {
489 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
490 if (SP_IS_STOP (ochild)) {
491 return SP_STOP(ochild);
492 }
493 }
494 return NULL;
495 }
497 SPStop*
498 sp_prev_stop(SPStop *stop, SPGradient *gradient)
499 {
500 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop)) {
501 return NULL;
502 }
503 SPObject *found = NULL;
504 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
505 if (SP_IS_STOP (ochild)) {
506 found = ochild;
507 }
508 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
509 break;
510 }
511 }
512 return SP_STOP(found);
513 }
515 SPStop*
516 sp_next_stop(SPStop *stop)
517 {
518 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
519 if (SP_IS_STOP (ochild))
520 return SP_STOP(ochild);
521 }
522 return NULL;
523 }
525 SPStop*
526 sp_last_stop(SPGradient *gradient)
527 {
528 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
529 if (sp_next_stop (stop) == NULL)
530 return stop;
531 }
532 return NULL;
533 }
535 guint sp_number_of_stops(SPGradient const *gradient)
536 {
537 guint n = 0;
538 for (SPStop *stop = sp_first_stop(const_cast<SPGradient*>(gradient)); stop; stop = sp_next_stop(stop)) {
539 if ( sp_next_stop(stop) ) {
540 n++;
541 } else {
542 break;
543 }
544 }
545 return n;
546 }
548 guint sp_number_of_stops_before_stop(SPGradient const *gradient, SPStop *target)
549 {
550 guint n = 0;
551 for (SPStop *stop = sp_first_stop(const_cast<SPGradient*>(gradient)); stop; stop = sp_next_stop(stop)) {
552 if (stop != target) {
553 n++;
554 } else {
555 break;
556 }
557 }
558 return n;
559 }
562 SPStop*
563 sp_get_stop_i(SPGradient *gradient, guint stop_i)
564 {
565 SPStop *stop = sp_first_stop (gradient);
567 // if this is valid but weird gradient without an offset-zero stop element,
568 // inkscape has created a handle for the start of gradient anyway,
569 // so when it asks for stop N that corresponds to stop element N-1
570 if (stop->offset != 0)
571 stop_i --;
573 for (guint i=0; i < stop_i; i++) {
574 if (!stop) return NULL;
575 stop = sp_next_stop (stop);
576 }
578 return stop;
579 }
581 guint32
582 average_color (guint32 c1, guint32 c2, gdouble p)
583 {
584 guint32 r = (guint32) (SP_RGBA32_R_U (c1) * (1 - p) + SP_RGBA32_R_U (c2) * p);
585 guint32 g = (guint32) (SP_RGBA32_G_U (c1) * (1 - p) + SP_RGBA32_G_U (c2) * p);
586 guint32 b = (guint32) (SP_RGBA32_B_U (c1) * (1 - p) + SP_RGBA32_B_U (c2) * p);
587 guint32 a = (guint32) (SP_RGBA32_A_U (c1) * (1 - p) + SP_RGBA32_A_U (c2) * p);
589 return SP_RGBA32_U_COMPOSE (r, g, b, a);
590 }
592 SPStop *
593 sp_vector_add_stop (SPGradient *vector, SPStop* prev_stop, SPStop* next_stop, gfloat offset)
594 {
595 Inkscape::XML::Node *new_stop_repr = NULL;
596 new_stop_repr = SP_OBJECT_REPR(prev_stop)->duplicate(SP_OBJECT_REPR(vector)->document());
597 SP_OBJECT_REPR(vector)->addChild(new_stop_repr, SP_OBJECT_REPR(prev_stop));
599 SPStop *newstop = (SPStop *) SP_OBJECT_DOCUMENT(vector)->getObjectByRepr(new_stop_repr);
600 newstop->offset = offset;
601 sp_repr_set_css_double( SP_OBJECT_REPR(newstop), "offset", (double)offset);
602 guint32 const c1 = sp_stop_get_rgba32(prev_stop);
603 guint32 const c2 = sp_stop_get_rgba32(next_stop);
604 guint32 cnew = average_color (c1, c2, (offset - prev_stop->offset) / (next_stop->offset - prev_stop->offset));
605 Inkscape::CSSOStringStream os;
606 gchar c[64];
607 sp_svg_write_color (c, sizeof(c), cnew);
608 gdouble opacity = (gdouble) SP_RGBA32_A_F (cnew);
609 os << "stop-color:" << c << ";stop-opacity:" << opacity <<";";
610 SP_OBJECT_REPR (newstop)->setAttribute("style", os.str().c_str());
611 Inkscape::GC::release(new_stop_repr);
613 return newstop;
614 }
616 void
617 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
618 {
619 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
621 if (!gradient || !SP_IS_GRADIENT(gradient))
622 return;
624 SPGradient *vector = sp_gradient_get_vector (gradient, false);
625 switch (point_type) {
626 case POINT_LG_BEGIN:
627 case POINT_RG_CENTER:
628 case POINT_RG_FOCUS:
629 {
630 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
631 gtk_widget_show (dialog);
632 }
633 break;
635 case POINT_LG_END:
636 case POINT_RG_R1:
637 case POINT_RG_R2:
638 {
639 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
640 gtk_widget_show (dialog);
641 }
642 break;
644 case POINT_LG_MID:
645 case POINT_RG_MID1:
646 case POINT_RG_MID2:
647 {
648 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
649 gtk_widget_show (dialog);
650 }
651 break;
652 default:
653 break;
654 }
655 }
657 guint32
658 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
659 {
660 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
662 if (!gradient || !SP_IS_GRADIENT(gradient))
663 return 0;
665 SPGradient *vector = sp_gradient_get_vector (gradient, false);
667 if (!vector) // orphan!
668 return 0; // what else to do?
670 switch (point_type) {
671 case POINT_LG_BEGIN:
672 case POINT_RG_CENTER:
673 case POINT_RG_FOCUS:
674 {
675 SPStop *first = sp_first_stop (vector);
676 if (first) {
677 return sp_stop_get_rgba32(first);
678 }
679 }
680 break;
682 case POINT_LG_END:
683 case POINT_RG_R1:
684 case POINT_RG_R2:
685 {
686 SPStop *last = sp_last_stop (vector);
687 if (last) {
688 return sp_stop_get_rgba32(last);
689 }
690 }
691 break;
693 case POINT_LG_MID:
694 case POINT_RG_MID1:
695 case POINT_RG_MID2:
696 {
697 SPStop *stopi = sp_get_stop_i (vector, point_i);
698 if (stopi) {
699 return sp_stop_get_rgba32(stopi);
700 }
701 }
702 break;
704 default:
705 break;
706 }
707 return 0;
708 }
710 void
711 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
712 {
713 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
715 if (!gradient || !SP_IS_GRADIENT(gradient))
716 return;
718 SPGradient *vector = sp_gradient_get_vector (gradient, false);
720 if (!vector) // orphan!
721 return;
723 vector = sp_gradient_fork_vector_if_necessary (vector);
724 if ( gradient != vector && gradient->ref->getObject() != vector ) {
725 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
726 }
728 switch (point_type) {
729 case POINT_LG_BEGIN:
730 case POINT_RG_CENTER:
731 case POINT_RG_FOCUS:
732 {
733 SPStop *first = sp_first_stop (vector);
734 if (first) {
735 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
736 }
737 }
738 break;
740 case POINT_LG_END:
741 case POINT_RG_R1:
742 case POINT_RG_R2:
743 {
744 SPStop *last = sp_last_stop (vector);
745 if (last) {
746 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
747 }
748 }
749 break;
751 case POINT_LG_MID:
752 case POINT_RG_MID1:
753 case POINT_RG_MID2:
754 {
755 SPStop *stopi = sp_get_stop_i (vector, point_i);
756 if (stopi) {
757 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
758 }
759 }
760 break;
762 default:
763 break;
764 }
765 }
767 void
768 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
769 {
770 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
771 if (!gradient || !SP_IS_GRADIENT(gradient))
772 return;
774 SPGradient *vector = sp_gradient_get_vector (gradient, false);
775 if (!vector) // orphan!
776 return;
778 vector = sp_gradient_fork_vector_if_necessary (vector);
779 if ( gradient != vector && gradient->ref->getObject() != vector ) {
780 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
781 }
783 GSList *child_reprs = NULL;
784 GSList *child_objects = NULL;
785 std::vector<double> offsets;
786 for (SPObject *child = sp_object_first_child(vector);
787 child != NULL; child = SP_OBJECT_NEXT(child)) {
788 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
789 child_objects = g_slist_prepend (child_objects, child);
790 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
791 }
793 GSList *child_copies = NULL;
794 for (GSList *i = child_reprs; i != NULL; i = i->next) {
795 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
796 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
797 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
798 }
801 for (GSList *i = child_objects; i != NULL; i = i->next) {
802 SPObject *child = SP_OBJECT (i->data);
803 child->deleteObject();
804 }
806 std::vector<double>::iterator iter = offsets.end() - 1;
807 for (GSList *i = child_copies; i != NULL; i = i->next) {
808 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
809 vector->appendChildRepr(copy);
810 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
811 iter --;
812 Inkscape::GC::release(copy);
813 }
815 g_slist_free (child_reprs);
816 g_slist_free (child_copies);
817 g_slist_free (child_objects);
818 }
821 /**
822 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
823 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
824 */
825 void
826 sp_item_gradient_set_coords (SPItem *item, guint point_type, guint point_i, Geom::Point p_w, bool fill_or_stroke, bool write_repr, bool scale)
827 {
828 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
830 if (!gradient || !SP_IS_GRADIENT(gradient))
831 return;
833 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
835 Geom::Matrix i2d (sp_item_i2d_affine (item));
836 Geom::Point p = p_w * i2d.inverse();
837 p *= (gradient->gradientTransform).inverse();
838 // now p is in gradient's original coordinates
840 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
842 if (SP_IS_LINEARGRADIENT(gradient)) {
843 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
844 switch (point_type) {
845 case POINT_LG_BEGIN:
846 if (scale) {
847 lg->x2.computed += (lg->x1.computed - p[Geom::X]);
848 lg->y2.computed += (lg->y1.computed - p[Geom::Y]);
849 }
850 lg->x1.computed = p[Geom::X];
851 lg->y1.computed = p[Geom::Y];
852 if (write_repr) {
853 if (scale) {
854 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
855 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
856 }
857 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
858 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
859 } else {
860 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
861 }
862 break;
863 case POINT_LG_END:
864 if (scale) {
865 lg->x1.computed += (lg->x2.computed - p[Geom::X]);
866 lg->y1.computed += (lg->y2.computed - p[Geom::Y]);
867 }
868 lg->x2.computed = p[Geom::X];
869 lg->y2.computed = p[Geom::Y];
870 if (write_repr) {
871 if (scale) {
872 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
873 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
874 }
875 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
876 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
877 } else {
878 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
879 }
880 break;
881 case POINT_LG_MID:
882 {
883 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
884 double offset = get_offset_between_points (p, Geom::Point(lg->x1.computed, lg->y1.computed), Geom::Point(lg->x2.computed, lg->y2.computed));
885 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (lg, false);
886 sp_gradient_ensure_vector(lg);
887 lg->vector.stops.at(point_i).offset = offset;
888 SPStop* stopi = sp_get_stop_i(vector, point_i);
889 stopi->offset = offset;
890 if (write_repr) {
891 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
892 } else {
893 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
894 }
895 }
896 break;
897 default:
898 break;
899 }
900 } else if (SP_IS_RADIALGRADIENT(gradient)) {
901 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
902 Geom::Point c (rg->cx.computed, rg->cy.computed);
903 Geom::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
904 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && Geom::L2 (p_w - c_w) < 1e-3) {
905 // prevent setting a radius too close to the center
906 return;
907 }
908 Geom::Matrix new_transform;
909 bool transform_set = false;
911 switch (point_type) {
912 case POINT_RG_CENTER:
913 rg->fx.computed = p[Geom::X] + (rg->fx.computed - rg->cx.computed);
914 rg->fy.computed = p[Geom::Y] + (rg->fy.computed - rg->cy.computed);
915 rg->cx.computed = p[Geom::X];
916 rg->cy.computed = p[Geom::Y];
917 if (write_repr) {
918 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
919 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
920 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
921 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
922 } else {
923 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
924 }
925 break;
926 case POINT_RG_FOCUS:
927 rg->fx.computed = p[Geom::X];
928 rg->fy.computed = p[Geom::Y];
929 if (write_repr) {
930 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
931 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
932 } else {
933 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
934 }
935 break;
936 case POINT_RG_R1:
937 {
938 Geom::Point r1_w = (c + Geom::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
939 double r1_angle = Geom::atan2(r1_w - c_w);
940 double move_angle = Geom::atan2(p_w - c_w) - r1_angle;
941 double move_stretch = Geom::L2(p_w - c_w) / Geom::L2(r1_w - c_w);
943 Geom::Matrix move = Geom::Matrix (Geom::Translate (-c_w)) *
944 Geom::Matrix (Geom::Rotate(-r1_angle)) *
945 Geom::Matrix (Geom::Scale(move_stretch, scale? move_stretch : 1)) *
946 Geom::Matrix (Geom::Rotate(r1_angle)) *
947 Geom::Matrix (Geom::Rotate(move_angle)) *
948 Geom::Matrix (Geom::Translate (c_w));
950 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
951 transform_set = true;
953 break;
954 }
955 case POINT_RG_R2:
956 {
957 Geom::Point r2_w = (c + Geom::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
958 double r2_angle = Geom::atan2(r2_w - c_w);
959 double move_angle = Geom::atan2(p_w - c_w) - r2_angle;
960 double move_stretch = Geom::L2(p_w - c_w) / Geom::L2(r2_w - c_w);
962 Geom::Matrix move = Geom::Matrix (Geom::Translate (-c_w)) *
963 Geom::Matrix (Geom::Rotate(-r2_angle)) *
964 Geom::Matrix (Geom::Scale(move_stretch, scale? move_stretch : 1)) *
965 Geom::Matrix (Geom::Rotate(r2_angle)) *
966 Geom::Matrix (Geom::Rotate(move_angle)) *
967 Geom::Matrix (Geom::Translate (c_w));
969 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
970 transform_set = true;
972 break;
973 }
974 case POINT_RG_MID1:
975 {
976 Geom::Point start = Geom::Point (rg->cx.computed, rg->cy.computed);
977 Geom::Point end = Geom::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
978 double offset = get_offset_between_points (p, start, end);
979 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (rg, false);
980 sp_gradient_ensure_vector(rg);
981 rg->vector.stops.at(point_i).offset = offset;
982 SPStop* stopi = sp_get_stop_i(vector, point_i);
983 stopi->offset = offset;
984 if (write_repr) {
985 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
986 } else {
987 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
988 }
989 break;
990 }
991 case POINT_RG_MID2:
992 Geom::Point start = Geom::Point (rg->cx.computed, rg->cy.computed);
993 Geom::Point end = Geom::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
994 double offset = get_offset_between_points (p, start, end);
995 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(rg, false);
996 sp_gradient_ensure_vector(rg);
997 rg->vector.stops.at(point_i).offset = offset;
998 SPStop* stopi = sp_get_stop_i(vector, point_i);
999 stopi->offset = offset;
1000 if (write_repr) {
1001 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
1002 } else {
1003 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1004 }
1005 break;
1006 }
1008 if (transform_set) {
1009 gradient->gradientTransform = new_transform;
1010 gradient->gradientTransform_set = TRUE;
1011 if (write_repr) {
1012 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
1013 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
1014 g_free(s);
1015 } else {
1016 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
1017 }
1018 }
1019 }
1020 }
1022 SPGradient *
1023 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
1024 {
1025 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1027 if (gradient)
1028 return sp_gradient_get_vector (gradient, false);
1029 return NULL;
1030 }
1032 SPGradientSpread
1033 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
1034 {
1035 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1037 if (gradient)
1038 return sp_gradient_get_spread (gradient);
1039 return SP_GRADIENT_SPREAD_PAD;
1040 }
1043 /**
1044 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
1045 in desktop coordinates.
1046 */
1048 Geom::Point
1049 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
1050 {
1051 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1053 Geom::Point p (0, 0);
1055 if (!gradient)
1056 return from_2geom(p);
1058 if (SP_IS_LINEARGRADIENT(gradient)) {
1059 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
1060 switch (point_type) {
1061 case POINT_LG_BEGIN:
1062 p = Geom::Point (lg->x1.computed, lg->y1.computed);
1063 break;
1064 case POINT_LG_END:
1065 p = Geom::Point (lg->x2.computed, lg->y2.computed);
1066 break;
1067 case POINT_LG_MID:
1068 {
1069 gdouble offset = lg->vector.stops.at(point_i).offset;
1070 p = (1-offset) * Geom::Point(lg->x1.computed, lg->y1.computed) + offset * Geom::Point(lg->x2.computed, lg->y2.computed);
1071 }
1072 break;
1073 }
1074 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1075 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1076 switch (point_type) {
1077 case POINT_RG_CENTER:
1078 p = Geom::Point (rg->cx.computed, rg->cy.computed);
1079 break;
1080 case POINT_RG_FOCUS:
1081 p = Geom::Point (rg->fx.computed, rg->fy.computed);
1082 break;
1083 case POINT_RG_R1:
1084 p = Geom::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1085 break;
1086 case POINT_RG_R2:
1087 p = Geom::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1088 break;
1089 case POINT_RG_MID1:
1090 {
1091 gdouble offset = rg->vector.stops.at(point_i).offset;
1092 p = (1-offset) * Geom::Point (rg->cx.computed, rg->cy.computed) + offset * Geom::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1093 }
1094 break;
1095 case POINT_RG_MID2:
1096 {
1097 gdouble offset = rg->vector.stops.at(point_i).offset;
1098 p = (1-offset) * Geom::Point (rg->cx.computed, rg->cy.computed) + offset * Geom::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1099 }
1100 break;
1101 }
1102 }
1104 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1105 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1106 Geom::OptRect bbox = item->getBounds(Geom::identity()); // we need "true" bbox without item_i2d_affine
1107 if (bbox) {
1108 p *= Geom::Matrix(bbox->dimensions()[Geom::X], 0,
1109 0, bbox->dimensions()[Geom::Y],
1110 bbox->min()[Geom::X], bbox->min()[Geom::Y]);
1111 }
1112 }
1113 p *= Geom::Matrix(gradient->gradientTransform) * (Geom::Matrix)sp_item_i2d_affine(item);
1114 return from_2geom(p);
1115 }
1118 /**
1119 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1120 * new private gradient, if needed.
1121 * gr has to be a normalized vector.
1122 */
1124 SPGradient *
1125 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1126 {
1127 g_return_val_if_fail(item != NULL, NULL);
1128 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1129 g_return_val_if_fail(gr != NULL, NULL);
1130 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1131 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1133 SPStyle *style = SP_OBJECT_STYLE(item);
1134 g_assert(style != NULL);
1136 SPPaintServer *ps = NULL;
1137 if (is_fill? style->fill.isPaintserver() : style->stroke.isPaintserver())
1138 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1140 if (ps
1141 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1142 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1143 {
1145 /* Current fill style is the gradient of the required type */
1146 SPGradient *current = SP_GRADIENT(ps);
1148 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1150 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1151 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1153 // current is private and it's either used once, or all its uses are by children of item;
1154 // so just change its href to vector
1156 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1157 /* href is not the vector */
1158 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1159 }
1160 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1161 return current;
1163 } else {
1165 // the gradient is not private, or it is shared with someone else;
1166 // normalize it (this includes creating new private if necessary)
1167 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1169 g_return_val_if_fail(normalized != NULL, NULL);
1171 if (normalized != current) {
1173 /* We have to change object style here; recursive because this is used from
1174 * fill&stroke and must work for groups etc. */
1175 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1176 }
1177 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1178 return normalized;
1179 }
1181 } else {
1182 /* Current fill style is not a gradient or wrong type, so construct everything */
1183 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1184 constructed = sp_gradient_reset_to_userspace(constructed, item);
1185 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1186 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1187 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1188 return constructed;
1189 }
1190 }
1192 static void
1193 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1194 {
1195 g_return_if_fail(repr != NULL);
1196 g_return_if_fail(link != NULL);
1197 g_return_if_fail(SP_IS_GRADIENT(link));
1199 gchar *ref;
1200 if (link) {
1201 gchar const *id = link->getId();
1202 size_t const len = strlen(id);
1203 ref = (gchar*) alloca(len + 2);
1204 *ref = '#';
1205 memcpy(ref + 1, id, len + 1);
1206 } else {
1207 ref = NULL;
1208 }
1210 repr->setAttribute("xlink:href", ref);
1211 }
1213 /*
1214 * Get default normalized gradient vector of document, create if there is none
1215 */
1217 SPGradient *
1218 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1219 {
1220 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1221 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1223 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1225 repr->setAttribute("inkscape:collect", "always");
1226 // set here, but removed when it's edited in the gradient editor
1227 // to further reduce clutter, we could
1228 // (1) here, search gradients by color and return what is found without duplication
1229 // (2) in fill & stroke, show only one copy of each gradient in list
1231 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1233 gchar b[64];
1234 sp_svg_write_color(b, sizeof(b), color);
1236 {
1237 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1238 stop->setAttribute("style", t);
1239 g_free(t);
1240 }
1242 stop->setAttribute("offset", "0");
1244 repr->appendChild(stop);
1245 Inkscape::GC::release(stop);
1247 stop = xml_doc->createElement("svg:stop");
1249 {
1250 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1251 stop->setAttribute("style", t);
1252 g_free(t);
1253 }
1255 stop->setAttribute("offset", "1");
1257 repr->appendChild(stop);
1258 Inkscape::GC::release(stop);
1260 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1261 Inkscape::GC::release(repr);
1263 /* fixme: This does not look like nice */
1264 SPGradient *gr;
1265 gr = (SPGradient *) document->getObjectByRepr(repr);
1266 g_assert(gr != NULL);
1267 g_assert(SP_IS_GRADIENT(gr));
1268 /* fixme: Maybe add extra sanity check here */
1269 gr->state = SP_GRADIENT_STATE_VECTOR;
1271 return gr;
1272 }
1274 /**
1275 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1276 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1277 */
1278 SPGradient *
1279 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1280 SPObject *const o, bool const is_fill)
1281 {
1282 guint32 rgba = 0;
1283 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1284 rgba = sp_desktop_get_color(desktop, is_fill);
1285 } else {
1286 // take the color of the object
1287 SPStyle const &style = *SP_OBJECT_STYLE(o);
1288 SPIPaint const &paint = ( is_fill
1289 ? style.fill
1290 : style.stroke );
1291 if (paint.isPaintserver()) {
1292 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1293 if (SP_IS_GRADIENT (server)) {
1294 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1295 } else {
1296 rgba = sp_desktop_get_color(desktop, is_fill);
1297 }
1298 } else if (paint.isColor()) {
1299 rgba = paint.value.color.toRGBA32( 0xff );
1300 } else {
1301 // if o doesn't use flat color, then take current color of the desktop.
1302 rgba = sp_desktop_get_color(desktop, is_fill);
1303 }
1304 }
1306 return sp_document_default_gradient_vector(doc, rgba);
1307 }
1310 /*
1311 Local Variables:
1312 mode:c++
1313 c-file-style:"stroustrup"
1314 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1315 indent-tabs-mode:nil
1316 fill-column:99
1317 End:
1318 */
1319 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :