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 "xml/repr.h"
35 #include "svg/svg.h"
36 #include "svg/svg-color.h"
37 #include "svg/css-ostringstream.h"
38 #include "prefs-utils.h"
41 // Terminology:
42 //
43 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
44 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
45 //
46 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
47 // radial). It references a vector for the actual colors. Each private is only used by one
48 // object. It is either linear or radial.
50 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
52 SPGradient *
53 sp_gradient_ensure_vector_normalized(SPGradient *gr)
54 {
55 g_return_val_if_fail(gr != NULL, NULL);
56 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
58 /* If we are already normalized vector, just return */
59 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
60 /* Fail, if we have wrong state set */
61 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
62 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, SP_OBJECT_ID(gr));
63 return NULL;
64 }
66 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
67 if (!gr->has_stops) {
68 /* We do not have stops ourselves, so flatten stops as well */
69 sp_gradient_ensure_vector(gr);
70 g_assert(gr->vector.built);
71 // this adds stops from gr->vector as children to gr
72 sp_gradient_repr_write_vector (gr);
73 }
75 /* If gr hrefs some other gradient, remove the href */
76 if (gr->ref->getObject()) {
77 /* We are hrefing someone, so require flattening */
78 SP_OBJECT(gr)->updateRepr(SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
79 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
80 }
82 /* Everything is OK, set state flag */
83 gr->state = SP_GRADIENT_STATE_VECTOR;
84 return gr;
85 }
87 /**
88 * Creates new private gradient for the given vector
89 */
91 static SPGradient *
92 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
93 {
94 g_return_val_if_fail(document != NULL, NULL);
95 g_return_val_if_fail(vector != NULL, NULL);
96 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
97 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
99 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
101 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
102 // create a new private gradient of the requested type
103 Inkscape::XML::Node *repr;
104 if (type == SP_GRADIENT_TYPE_LINEAR) {
105 repr = xml_doc->createElement("svg:linearGradient");
106 } else {
107 repr = xml_doc->createElement("svg:radialGradient");
108 }
110 // privates are garbage-collectable
111 repr->setAttribute("inkscape:collect", "always");
113 // link to vector
114 sp_gradient_repr_set_link(repr, vector);
116 /* Append the new private gradient to defs */
117 SP_OBJECT_REPR(defs)->appendChild(repr);
118 Inkscape::GC::release(repr);
120 // get corresponding object
121 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
122 g_assert(gr != NULL);
123 g_assert(SP_IS_GRADIENT(gr));
125 return gr;
126 }
128 /**
129 Count how many times gr is used by the styles of o and its descendants
130 */
131 guint
132 count_gradient_hrefs(SPObject *o, SPGradient *gr)
133 {
134 if (!o)
135 return 1;
137 guint i = 0;
139 SPStyle *style = SP_OBJECT_STYLE(o);
140 if (style
141 && style->fill.isPaintserver()
142 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
143 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
144 {
145 i ++;
146 }
147 if (style
148 && style->stroke.isPaintserver()
149 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
150 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
151 {
152 i ++;
153 }
155 for (SPObject *child = sp_object_first_child(o);
156 child != NULL; child = SP_OBJECT_NEXT(child)) {
157 i += count_gradient_hrefs(child, gr);
158 }
160 return i;
161 }
164 /**
165 * If gr has other users, create a new private; also check if gr links to vector, relink if not
166 */
167 SPGradient *
168 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
169 SPGradientType type, SPObject *o)
170 {
171 g_return_val_if_fail(gr != NULL, NULL);
172 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
174 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
175 // but i think we should not abort on this - maybe just write a validity warning into some sort
176 // of log
177 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
178 return (gr);
180 // user is the object that uses this gradient; normally it's item but for tspans, we
181 // check its ancestor text so that tspans don't get different gradients from their
182 // texts.
183 SPObject *user = o;
184 while (SP_IS_TSPAN(user)) {
185 user = SP_OBJECT_PARENT(user);
186 }
188 // Check the number of uses of the gradient within this object;
189 // if we are private and there are no other users,
190 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
191 // check vector
192 if ( gr != vector && gr->ref->getObject() != vector ) {
193 /* our href is not the vector, and vector is different from gr; relink */
194 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
195 }
196 return gr;
197 }
199 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
200 SPObject *defs = SP_DOCUMENT_DEFS(doc);
202 if ((gr->has_stops) ||
203 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
204 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
205 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
206 // we have to clone a fresh new private gradient for the given vector
208 // create an empty one
209 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
211 // copy all the attributes to it
212 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
213 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
214 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
215 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
216 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
217 if (SP_IS_RADIALGRADIENT(gr)) {
218 repr_new->setAttribute("cx", repr->attribute("cx"));
219 repr_new->setAttribute("cy", repr->attribute("cy"));
220 repr_new->setAttribute("fx", repr->attribute("fx"));
221 repr_new->setAttribute("fy", repr->attribute("fy"));
222 repr_new->setAttribute("r", repr->attribute("r"));
223 } else {
224 repr_new->setAttribute("x1", repr->attribute("x1"));
225 repr_new->setAttribute("y1", repr->attribute("y1"));
226 repr_new->setAttribute("x2", repr->attribute("x2"));
227 repr_new->setAttribute("y2", repr->attribute("y2"));
228 }
230 return gr_new;
231 } else {
232 return gr;
233 }
234 }
236 SPGradient *
237 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
238 {
239 // Some people actually prefer their gradient vectors to be shared...
240 if (prefs_get_int_attribute("options.forkgradientvectors", "value", 1) == 0)
241 return gr;
243 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
244 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
245 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
247 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate(xml_doc);
248 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (doc))->addChild(repr, NULL);
249 SPGradient *gr_new = (SPGradient *) doc->getObjectByRepr(repr);
250 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
251 Inkscape::GC::release(repr);
252 return gr_new;
253 }
254 return gr;
255 }
257 /**
258 * Obtain the vector from the gradient. A forked vector will be created and linked to this gradient if another gradient uses it.
259 */
260 SPGradient *
261 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
262 {
263 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
264 vector = sp_gradient_fork_vector_if_necessary (vector);
265 if ( gradient != vector && gradient->ref->getObject() != vector ) {
266 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
267 }
268 return vector;
269 }
272 /**
273 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
274 * instead. No forking or reapplying is done because this is only called for newly created privates.
275 * @return The new gradient.
276 */
277 SPGradient *
278 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
279 {
280 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
282 // calculate the bbox of the item
283 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
284 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
286 if ( !bbox || bbox->isEmpty() )
287 return gr;
289 NR::Coord const width = bbox->dimensions()[NR::X];
290 NR::Coord const height = bbox->dimensions()[NR::Y];
292 NR::Point const center = bbox->midpoint();
294 if (SP_IS_RADIALGRADIENT(gr)) {
295 sp_repr_set_svg_double(repr, "cx", center[NR::X]);
296 sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
297 sp_repr_set_svg_double(repr, "fx", center[NR::X]);
298 sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
299 sp_repr_set_svg_double(repr, "r", width/2);
301 // we want it to be elliptic, not circular
302 NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
303 NR::Matrix (NR::scale(1, height/width)) *
304 NR::Matrix (NR::translate (center));
306 gr->gradientTransform = squeeze;
307 {
308 gchar *c=sp_svg_transform_write(gr->gradientTransform);
309 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
310 g_free(c);
311 }
312 } else {
313 sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
314 sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
315 sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
316 sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
317 }
319 // set the gradientUnits
320 repr->setAttribute("gradientUnits", "userSpaceOnUse");
322 return gr;
323 }
325 /**
326 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
327 * @return The new gradient.
328 */
329 SPGradient *
330 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
331 {
332 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
334 // First, fork it if it is shared
335 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
336 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
338 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
340 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
342 // calculate the bbox of the item
343 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
344 NR::Matrix bbox2user;
345 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
346 if ( bbox && !bbox->isEmpty() ) {
347 bbox2user = NR::Matrix(bbox->dimensions()[NR::X], 0,
348 0, bbox->dimensions()[NR::Y],
349 bbox->min()[NR::X], bbox->min()[NR::Y]);
350 } else {
351 // would be degenerate otherwise
352 bbox2user = NR::identity();
353 }
355 /* skew is the additional transform, defined by the proportions of the item, that we need
356 * to apply to the gradient in order to work around this weird bit from SVG 1.1
357 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
358 *
359 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
360 * matrix, the stripes of the linear gradient are perpendicular to the gradient
361 * vector in object bounding box space (i.e., the abstract coordinate system where
362 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
363 * bottom/right of the object bounding box). When the object's bounding box is not
364 * square, the stripes that are conceptually perpendicular to the gradient vector
365 * within object bounding box space will render non-perpendicular relative to the
366 * gradient vector in user space due to application of the non-uniform scaling
367 * transformation from bounding box space to user space.
368 */
369 NR::Matrix skew = bbox2user;
370 double exp = NR::expansion(skew);
371 skew[0] /= exp;
372 skew[1] /= exp;
373 skew[2] /= exp;
374 skew[3] /= exp;
375 skew[4] = 0;
376 skew[5] = 0;
378 // apply skew to the gradient
379 gr->gradientTransform = skew;
380 {
381 gchar *c=sp_svg_transform_write(gr->gradientTransform);
382 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
383 g_free(c);
384 }
386 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
387 // as to cancel it out when it's applied to the gradient during rendering
388 NR::Matrix point_convert = bbox2user * skew.inverse();
390 if (SP_IS_RADIALGRADIENT(gr)) {
391 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
393 // original points in the bbox coords
394 NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
395 NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
396 double r_b = rg->r.computed;
398 // converted points in userspace coords
399 NR::Point c_u = c_b * point_convert;
400 NR::Point f_u = f_b * point_convert;
401 double r_u = r_b * NR::expansion(point_convert);
403 sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
404 sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
405 sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
406 sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
407 sp_repr_set_svg_double(repr, "r", r_u);
409 } else {
410 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
412 NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
413 NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
415 NR::Point p1_u = p1_b * point_convert;
416 NR::Point p2_u = p2_b * point_convert;
418 sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
419 sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
420 sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
421 sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
422 }
424 // set the gradientUnits
425 repr->setAttribute("gradientUnits", "userSpaceOnUse");
426 }
428 // apply the gradient to the item (may be necessary if we forked it); not recursive
429 // generally because grouped items will be taken care of later (we're being called
430 // from sp_item_adjust_paint_recursive); however text and all its children should all
431 // refer to one gradient, hence the recursive call for text (because we can't/don't
432 // want to access tspans and set gradients on them separately)
433 if (SP_IS_TEXT(item))
434 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
435 else
436 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
438 return gr;
439 }
441 void
442 sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
443 {
444 if (set) {
445 gradient->gradientTransform = postmul;
446 } else {
447 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
448 }
449 gradient->gradientTransform_set = TRUE;
451 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
452 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
453 g_free(c);
454 }
456 SPGradient *
457 sp_item_gradient (SPItem *item, bool fill_or_stroke)
458 {
459 SPStyle *style = SP_OBJECT_STYLE (item);
460 SPGradient *gradient = NULL;
462 if (fill_or_stroke) {
463 if (style && (style->fill.isPaintserver())) {
464 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
465 if (SP_IS_GRADIENT (server)) {
466 gradient = SP_GRADIENT (server);
467 }
468 }
469 } else {
470 if (style && (style->stroke.isPaintserver())) {
471 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
472 if (SP_IS_GRADIENT (server)) {
473 gradient = SP_GRADIENT (server);
474 }
475 }
476 }
478 return gradient;
479 }
482 SPStop*
483 sp_first_stop(SPGradient *gradient)
484 {
485 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
486 if (SP_IS_STOP (ochild))
487 return SP_STOP(ochild);
488 }
489 return NULL;
490 }
492 SPStop*
493 sp_prev_stop(SPStop *stop, SPGradient *gradient)
494 {
495 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
496 return NULL;
497 SPObject *found = NULL;
498 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
499 if (SP_IS_STOP (ochild)) {
500 found = ochild;
501 }
502 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
503 break;
504 }
505 }
506 return SP_STOP(found);
507 }
509 SPStop*
510 sp_next_stop(SPStop *stop)
511 {
512 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
513 if (SP_IS_STOP (ochild))
514 return SP_STOP(ochild);
515 }
516 return NULL;
517 }
519 SPStop*
520 sp_last_stop(SPGradient *gradient)
521 {
522 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
523 if (sp_next_stop (stop) == NULL)
524 return stop;
525 }
526 return NULL;
527 }
529 guint
530 sp_number_of_stops(SPGradient *gradient)
531 {
532 guint n = 0;
533 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
534 if (sp_next_stop (stop) == NULL)
535 return n;
536 n ++;
537 }
538 return n;
539 }
541 guint
542 sp_number_of_stops_before_stop(SPGradient *gradient, SPStop *target)
543 {
544 guint n = 0;
545 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
546 if (stop == target)
547 return n;
548 n ++;
549 }
550 return n;
551 }
554 SPStop*
555 sp_get_stop_i(SPGradient *gradient, guint stop_i)
556 {
557 SPStop *stop = sp_first_stop (gradient);
559 // if this is valid but weird gradient without an offset-zero stop element,
560 // inkscape has created a handle for the start of gradient anyway,
561 // so when it asks for stop N that corresponds to stop element N-1
562 if (stop->offset != 0)
563 stop_i --;
565 for (guint i=0; i < stop_i; i++) {
566 if (!stop) return NULL;
567 stop = sp_next_stop (stop);
568 }
570 return stop;
571 }
573 guint32
574 average_color (guint32 c1, guint32 c2, gdouble p)
575 {
576 guint32 r = (guint32) (SP_RGBA32_R_U (c1) * (1 - p) + SP_RGBA32_R_U (c2) * p);
577 guint32 g = (guint32) (SP_RGBA32_G_U (c1) * (1 - p) + SP_RGBA32_G_U (c2) * p);
578 guint32 b = (guint32) (SP_RGBA32_B_U (c1) * (1 - p) + SP_RGBA32_B_U (c2) * p);
579 guint32 a = (guint32) (SP_RGBA32_A_U (c1) * (1 - p) + SP_RGBA32_A_U (c2) * p);
581 return SP_RGBA32_U_COMPOSE (r, g, b, a);
582 }
584 SPStop *
585 sp_vector_add_stop (SPGradient *vector, SPStop* prev_stop, SPStop* next_stop, gfloat offset)
586 {
587 Inkscape::XML::Node *new_stop_repr = NULL;
588 new_stop_repr = SP_OBJECT_REPR(prev_stop)->duplicate(SP_OBJECT_REPR(vector)->document());
589 SP_OBJECT_REPR(vector)->addChild(new_stop_repr, SP_OBJECT_REPR(prev_stop));
591 SPStop *newstop = (SPStop *) SP_OBJECT_DOCUMENT(vector)->getObjectByRepr(new_stop_repr);
592 newstop->offset = offset;
593 sp_repr_set_css_double( SP_OBJECT_REPR(newstop), "offset", (double)offset);
594 guint32 const c1 = sp_stop_get_rgba32(prev_stop);
595 guint32 const c2 = sp_stop_get_rgba32(next_stop);
596 guint32 cnew = average_color (c1, c2, (offset - prev_stop->offset) / (next_stop->offset - prev_stop->offset));
597 Inkscape::CSSOStringStream os;
598 gchar c[64];
599 sp_svg_write_color (c, sizeof(c), cnew);
600 gdouble opacity = (gdouble) SP_RGBA32_A_F (cnew);
601 os << "stop-color:" << c << ";stop-opacity:" << opacity <<";";
602 SP_OBJECT_REPR (newstop)->setAttribute("style", os.str().c_str());
603 Inkscape::GC::release(new_stop_repr);
605 return newstop;
606 }
608 void
609 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
610 {
611 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
613 if (!gradient || !SP_IS_GRADIENT(gradient))
614 return;
616 SPGradient *vector = sp_gradient_get_vector (gradient, false);
617 switch (point_type) {
618 case POINT_LG_BEGIN:
619 case POINT_RG_CENTER:
620 case POINT_RG_FOCUS:
621 {
622 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
623 gtk_widget_show (dialog);
624 }
625 break;
627 case POINT_LG_END:
628 case POINT_RG_R1:
629 case POINT_RG_R2:
630 {
631 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
632 gtk_widget_show (dialog);
633 }
634 break;
636 case POINT_LG_MID:
637 case POINT_RG_MID1:
638 case POINT_RG_MID2:
639 {
640 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
641 gtk_widget_show (dialog);
642 }
643 break;
644 default:
645 break;
646 }
647 }
649 guint32
650 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
651 {
652 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
654 if (!gradient || !SP_IS_GRADIENT(gradient))
655 return 0;
657 SPGradient *vector = sp_gradient_get_vector (gradient, false);
659 if (!vector) // orphan!
660 return 0; // what else to do?
662 switch (point_type) {
663 case POINT_LG_BEGIN:
664 case POINT_RG_CENTER:
665 case POINT_RG_FOCUS:
666 {
667 SPStop *first = sp_first_stop (vector);
668 if (first) {
669 return sp_stop_get_rgba32(first);
670 }
671 }
672 break;
674 case POINT_LG_END:
675 case POINT_RG_R1:
676 case POINT_RG_R2:
677 {
678 SPStop *last = sp_last_stop (vector);
679 if (last) {
680 return sp_stop_get_rgba32(last);
681 }
682 }
683 break;
685 case POINT_LG_MID:
686 case POINT_RG_MID1:
687 case POINT_RG_MID2:
688 {
689 SPStop *stopi = sp_get_stop_i (vector, point_i);
690 if (stopi) {
691 return sp_stop_get_rgba32(stopi);
692 }
693 }
694 break;
696 default:
697 break;
698 }
699 return 0;
700 }
702 void
703 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
704 {
705 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
707 if (!gradient || !SP_IS_GRADIENT(gradient))
708 return;
710 SPGradient *vector = sp_gradient_get_vector (gradient, false);
712 if (!vector) // orphan!
713 return;
715 vector = sp_gradient_fork_vector_if_necessary (vector);
716 if ( gradient != vector && gradient->ref->getObject() != vector ) {
717 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
718 }
720 switch (point_type) {
721 case POINT_LG_BEGIN:
722 case POINT_RG_CENTER:
723 case POINT_RG_FOCUS:
724 {
725 SPStop *first = sp_first_stop (vector);
726 if (first) {
727 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
728 }
729 }
730 break;
732 case POINT_LG_END:
733 case POINT_RG_R1:
734 case POINT_RG_R2:
735 {
736 SPStop *last = sp_last_stop (vector);
737 if (last) {
738 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
739 }
740 }
741 break;
743 case POINT_LG_MID:
744 case POINT_RG_MID1:
745 case POINT_RG_MID2:
746 {
747 SPStop *stopi = sp_get_stop_i (vector, point_i);
748 if (stopi) {
749 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
750 }
751 }
752 break;
754 default:
755 break;
756 }
757 }
759 void
760 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
761 {
762 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
763 if (!gradient || !SP_IS_GRADIENT(gradient))
764 return;
766 SPGradient *vector = sp_gradient_get_vector (gradient, false);
767 if (!vector) // orphan!
768 return;
770 vector = sp_gradient_fork_vector_if_necessary (vector);
771 if ( gradient != vector && gradient->ref->getObject() != vector ) {
772 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
773 }
775 GSList *child_reprs = NULL;
776 GSList *child_objects = NULL;
777 std::vector<double> offsets;
778 for (SPObject *child = sp_object_first_child(vector);
779 child != NULL; child = SP_OBJECT_NEXT(child)) {
780 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
781 child_objects = g_slist_prepend (child_objects, child);
782 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
783 }
785 GSList *child_copies = NULL;
786 for (GSList *i = child_reprs; i != NULL; i = i->next) {
787 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
788 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
789 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
790 }
793 for (GSList *i = child_objects; i != NULL; i = i->next) {
794 SPObject *child = SP_OBJECT (i->data);
795 child->deleteObject();
796 }
798 std::vector<double>::iterator iter = offsets.end() - 1;
799 for (GSList *i = child_copies; i != NULL; i = i->next) {
800 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
801 vector->appendChildRepr(copy);
802 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
803 iter --;
804 Inkscape::GC::release(copy);
805 }
807 g_slist_free (child_reprs);
808 g_slist_free (child_copies);
809 g_slist_free (child_objects);
810 }
813 /**
814 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
815 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
816 */
817 void
818 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)
819 {
820 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
822 if (!gradient || !SP_IS_GRADIENT(gradient))
823 return;
825 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
827 NR::Matrix i2d = from_2geom(sp_item_i2d_affine (item));
828 NR::Point p = p_w * i2d.inverse();
829 p *= (gradient->gradientTransform).inverse();
830 // now p is in gradient's original coordinates
832 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
834 if (SP_IS_LINEARGRADIENT(gradient)) {
835 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
836 switch (point_type) {
837 case POINT_LG_BEGIN:
838 if (scale) {
839 lg->x2.computed += (lg->x1.computed - p[NR::X]);
840 lg->y2.computed += (lg->y1.computed - p[NR::Y]);
841 }
842 lg->x1.computed = p[NR::X];
843 lg->y1.computed = p[NR::Y];
844 if (write_repr) {
845 if (scale) {
846 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
847 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
848 }
849 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
850 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
851 } else {
852 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
853 }
854 break;
855 case POINT_LG_END:
856 if (scale) {
857 lg->x1.computed += (lg->x2.computed - p[NR::X]);
858 lg->y1.computed += (lg->y2.computed - p[NR::Y]);
859 }
860 lg->x2.computed = p[NR::X];
861 lg->y2.computed = p[NR::Y];
862 if (write_repr) {
863 if (scale) {
864 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
865 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
866 }
867 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
868 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
869 } else {
870 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
871 }
872 break;
873 case POINT_LG_MID:
874 {
875 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
876 double offset = get_offset_between_points (p, NR::Point(lg->x1.computed, lg->y1.computed), NR::Point(lg->x2.computed, lg->y2.computed));
877 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (lg, false);
878 sp_gradient_ensure_vector(lg);
879 lg->vector.stops.at(point_i).offset = offset;
880 SPStop* stopi = sp_get_stop_i(vector, point_i);
881 stopi->offset = offset;
882 if (write_repr) {
883 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
884 } else {
885 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
886 }
887 }
888 break;
889 default:
890 break;
891 }
892 } else if (SP_IS_RADIALGRADIENT(gradient)) {
893 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
894 NR::Point c (rg->cx.computed, rg->cy.computed);
895 NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
896 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
897 // prevent setting a radius too close to the center
898 return;
899 }
900 NR::Matrix new_transform;
901 bool transform_set = false;
903 switch (point_type) {
904 case POINT_RG_CENTER:
905 rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
906 rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
907 rg->cx.computed = p[NR::X];
908 rg->cy.computed = p[NR::Y];
909 if (write_repr) {
910 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
911 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
912 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
913 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
914 } else {
915 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
916 }
917 break;
918 case POINT_RG_FOCUS:
919 rg->fx.computed = p[NR::X];
920 rg->fy.computed = p[NR::Y];
921 if (write_repr) {
922 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
923 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
924 } else {
925 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
926 }
927 break;
928 case POINT_RG_R1:
929 {
930 NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
931 double r1_angle = NR::atan2(r1_w - c_w);
932 double move_angle = NR::atan2(p_w - c_w) - r1_angle;
933 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
935 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
936 NR::Matrix (NR::rotate(-r1_angle)) *
937 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
938 NR::Matrix (NR::rotate(r1_angle)) *
939 NR::Matrix (NR::rotate(move_angle)) *
940 NR::Matrix (NR::translate (c_w));
942 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
943 transform_set = true;
945 break;
946 }
947 case POINT_RG_R2:
948 {
949 NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
950 double r2_angle = NR::atan2(r2_w - c_w);
951 double move_angle = NR::atan2(p_w - c_w) - r2_angle;
952 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
954 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
955 NR::Matrix (NR::rotate(-r2_angle)) *
956 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
957 NR::Matrix (NR::rotate(r2_angle)) *
958 NR::Matrix (NR::rotate(move_angle)) *
959 NR::Matrix (NR::translate (c_w));
961 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
962 transform_set = true;
964 break;
965 }
966 case POINT_RG_MID1:
967 {
968 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
969 NR::Point end = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
970 double offset = get_offset_between_points (p, start, end);
971 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (rg, false);
972 sp_gradient_ensure_vector(rg);
973 rg->vector.stops.at(point_i).offset = offset;
974 SPStop* stopi = sp_get_stop_i(vector, point_i);
975 stopi->offset = offset;
976 if (write_repr) {
977 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
978 } else {
979 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
980 }
981 break;
982 }
983 case POINT_RG_MID2:
984 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
985 NR::Point end = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
986 double offset = get_offset_between_points (p, start, end);
987 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(rg, false);
988 sp_gradient_ensure_vector(rg);
989 rg->vector.stops.at(point_i).offset = offset;
990 SPStop* stopi = sp_get_stop_i(vector, point_i);
991 stopi->offset = offset;
992 if (write_repr) {
993 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
994 } else {
995 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
996 }
997 break;
998 }
999 if (transform_set) {
1000 gradient->gradientTransform = new_transform;
1001 gradient->gradientTransform_set = TRUE;
1002 if (write_repr) {
1003 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
1004 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
1005 g_free(s);
1006 } else {
1007 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
1008 }
1009 }
1010 }
1011 }
1013 SPGradient *
1014 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
1015 {
1016 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1018 if (gradient)
1019 return sp_gradient_get_vector (gradient, false);
1020 return NULL;
1021 }
1023 SPGradientSpread
1024 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
1025 {
1026 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1028 if (gradient)
1029 return sp_gradient_get_spread (gradient);
1030 return SP_GRADIENT_SPREAD_PAD;
1031 }
1034 /**
1035 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
1036 in desktop coordinates.
1037 */
1039 NR::Point
1040 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
1041 {
1042 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1044 NR::Point p (0, 0);
1046 if (!gradient)
1047 return p;
1049 if (SP_IS_LINEARGRADIENT(gradient)) {
1050 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
1051 switch (point_type) {
1052 case POINT_LG_BEGIN:
1053 p = NR::Point (lg->x1.computed, lg->y1.computed);
1054 break;
1055 case POINT_LG_END:
1056 p = NR::Point (lg->x2.computed, lg->y2.computed);
1057 break;
1058 case POINT_LG_MID:
1059 {
1060 gdouble offset = lg->vector.stops.at(point_i).offset;
1061 p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
1062 }
1063 break;
1064 }
1065 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1066 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1067 switch (point_type) {
1068 case POINT_RG_CENTER:
1069 p = NR::Point (rg->cx.computed, rg->cy.computed);
1070 break;
1071 case POINT_RG_FOCUS:
1072 p = NR::Point (rg->fx.computed, rg->fy.computed);
1073 break;
1074 case POINT_RG_R1:
1075 p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1076 break;
1077 case POINT_RG_R2:
1078 p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1079 break;
1080 case POINT_RG_MID1:
1081 {
1082 gdouble offset = rg->vector.stops.at(point_i).offset;
1083 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1084 }
1085 break;
1086 case POINT_RG_MID2:
1087 {
1088 gdouble offset = rg->vector.stops.at(point_i).offset;
1089 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1090 }
1091 break;
1092 }
1093 }
1095 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1096 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1097 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
1098 if (bbox) {
1099 p *= NR::Matrix(bbox->dimensions()[NR::X], 0,
1100 0, bbox->dimensions()[NR::Y],
1101 bbox->min()[NR::X], bbox->min()[NR::Y]);
1102 }
1103 }
1104 p *= NR::Matrix(gradient->gradientTransform) * from_2geom(sp_item_i2d_affine(item));
1105 return p;
1106 }
1109 /**
1110 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1111 * new private gradient, if needed.
1112 * gr has to be a normalized vector.
1113 */
1115 SPGradient *
1116 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1117 {
1118 g_return_val_if_fail(item != NULL, NULL);
1119 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1120 g_return_val_if_fail(gr != NULL, NULL);
1121 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1122 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1124 SPStyle *style = SP_OBJECT_STYLE(item);
1125 g_assert(style != NULL);
1127 SPPaintServer *ps = NULL;
1128 if (is_fill? style->fill.isPaintserver() : style->stroke.isPaintserver())
1129 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1131 if (ps
1132 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1133 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1134 {
1136 /* Current fill style is the gradient of the required type */
1137 SPGradient *current = SP_GRADIENT(ps);
1139 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1141 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1142 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1144 // current is private and it's either used once, or all its uses are by children of item;
1145 // so just change its href to vector
1147 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1148 /* href is not the vector */
1149 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1150 }
1151 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1152 return current;
1154 } else {
1156 // the gradient is not private, or it is shared with someone else;
1157 // normalize it (this includes creating new private if necessary)
1158 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1160 g_return_val_if_fail(normalized != NULL, NULL);
1162 if (normalized != current) {
1164 /* We have to change object style here; recursive because this is used from
1165 * fill&stroke and must work for groups etc. */
1166 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1167 }
1168 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1169 return normalized;
1170 }
1172 } else {
1173 /* Current fill style is not a gradient or wrong type, so construct everything */
1174 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1175 constructed = sp_gradient_reset_to_userspace(constructed, item);
1176 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1177 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1178 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1179 return constructed;
1180 }
1181 }
1183 static void
1184 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1185 {
1186 g_return_if_fail(repr != NULL);
1187 g_return_if_fail(link != NULL);
1188 g_return_if_fail(SP_IS_GRADIENT(link));
1190 gchar *ref;
1191 if (link) {
1192 gchar const *id = SP_OBJECT_ID(link);
1193 size_t const len = strlen(id);
1194 ref = (gchar*) alloca(len + 2);
1195 *ref = '#';
1196 memcpy(ref + 1, id, len + 1);
1197 } else {
1198 ref = NULL;
1199 }
1201 repr->setAttribute("xlink:href", ref);
1202 }
1204 /*
1205 * Get default normalized gradient vector of document, create if there is none
1206 */
1208 SPGradient *
1209 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1210 {
1211 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1212 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1214 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1216 repr->setAttribute("inkscape:collect", "always");
1217 // set here, but removed when it's edited in the gradient editor
1218 // to further reduce clutter, we could
1219 // (1) here, search gradients by color and return what is found without duplication
1220 // (2) in fill & stroke, show only one copy of each gradient in list
1222 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1224 gchar b[64];
1225 sp_svg_write_color(b, sizeof(b), color);
1227 {
1228 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1229 stop->setAttribute("style", t);
1230 g_free(t);
1231 }
1233 stop->setAttribute("offset", "0");
1235 repr->appendChild(stop);
1236 Inkscape::GC::release(stop);
1238 stop = xml_doc->createElement("svg:stop");
1240 {
1241 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1242 stop->setAttribute("style", t);
1243 g_free(t);
1244 }
1246 stop->setAttribute("offset", "1");
1248 repr->appendChild(stop);
1249 Inkscape::GC::release(stop);
1251 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1252 Inkscape::GC::release(repr);
1254 /* fixme: This does not look like nice */
1255 SPGradient *gr;
1256 gr = (SPGradient *) document->getObjectByRepr(repr);
1257 g_assert(gr != NULL);
1258 g_assert(SP_IS_GRADIENT(gr));
1259 /* fixme: Maybe add extra sanity check here */
1260 gr->state = SP_GRADIENT_STATE_VECTOR;
1262 return gr;
1263 }
1265 /**
1266 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1267 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1268 */
1269 SPGradient *
1270 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1271 SPObject *const o, bool const is_fill)
1272 {
1273 guint32 rgba = 0;
1274 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1275 rgba = sp_desktop_get_color(desktop, is_fill);
1276 } else {
1277 // take the color of the object
1278 SPStyle const &style = *SP_OBJECT_STYLE(o);
1279 SPIPaint const &paint = ( is_fill
1280 ? style.fill
1281 : style.stroke );
1282 if (paint.isPaintserver()) {
1283 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1284 if (SP_IS_GRADIENT (server)) {
1285 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1286 } else {
1287 rgba = sp_desktop_get_color(desktop, is_fill);
1288 }
1289 } else if (paint.isColor()) {
1290 rgba = paint.value.color.toRGBA32( 0xff );
1291 } else {
1292 // if o doesn't use flat color, then take current color of the desktop.
1293 rgba = sp_desktop_get_color(desktop, is_fill);
1294 }
1295 }
1297 return sp_document_default_gradient_vector(doc, rgba);
1298 }
1301 /*
1302 Local Variables:
1303 mode:c++
1304 c-file-style:"stroustrup"
1305 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1306 indent-tabs-mode:nil
1307 fill-column:99
1308 End:
1309 */
1310 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :