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"
36 #include "svg/css-ostringstream.h"
37 #include "prefs-utils.h"
40 // Terminology:
41 //
42 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
43 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
44 //
45 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
46 // radial). It references a vector for the actual colors. Each private is only used by one
47 // object. It is either linear or radial.
49 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
51 SPGradient *
52 sp_gradient_ensure_vector_normalized(SPGradient *gr)
53 {
54 g_return_val_if_fail(gr != NULL, NULL);
55 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
57 /* If we are already normalized vector, just return */
58 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
59 /* Fail, if we have wrong state set */
60 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
61 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, SP_OBJECT_ID(gr));
62 return NULL;
63 }
65 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
66 if (!gr->has_stops) {
67 /* We do not have stops ourselves, so flatten stops as well */
68 sp_gradient_ensure_vector(gr);
69 g_assert(gr->vector.built);
70 // this adds stops from gr->vector as children to gr
71 sp_gradient_repr_write_vector (gr);
72 }
74 /* If gr hrefs some other gradient, remove the href */
75 if (gr->ref->getObject()) {
76 /* We are hrefing someone, so require flattening */
77 SP_OBJECT(gr)->updateRepr(((SPObject *) gr)->repr, SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
78 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
79 }
81 /* Everything is OK, set state flag */
82 gr->state = SP_GRADIENT_STATE_VECTOR;
83 return gr;
84 }
86 /**
87 * Creates new private gradient for the given vector
88 */
90 static SPGradient *
91 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
92 {
93 g_return_val_if_fail(document != NULL, NULL);
94 g_return_val_if_fail(vector != NULL, NULL);
95 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
96 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
98 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
100 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
101 // create a new private gradient of the requested type
102 Inkscape::XML::Node *repr;
103 if (type == SP_GRADIENT_TYPE_LINEAR) {
104 repr = xml_doc->createElement("svg:linearGradient");
105 } else {
106 repr = xml_doc->createElement("svg:radialGradient");
107 }
109 // privates are garbage-collectable
110 repr->setAttribute("inkscape:collect", "always");
112 // link to vector
113 sp_gradient_repr_set_link(repr, vector);
115 /* Append the new private gradient to defs */
116 SP_OBJECT_REPR(defs)->appendChild(repr);
117 Inkscape::GC::release(repr);
119 // get corresponding object
120 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
121 g_assert(gr != NULL);
122 g_assert(SP_IS_GRADIENT(gr));
124 return gr;
125 }
127 /**
128 Count how many times gr is used by the styles of o and its descendants
129 */
130 guint
131 count_gradient_hrefs(SPObject *o, SPGradient *gr)
132 {
133 if (!o)
134 return 1;
136 guint i = 0;
138 SPStyle *style = SP_OBJECT_STYLE(o);
139 if (style
140 && style->fill.isPaintserver()
141 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
142 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
143 {
144 i ++;
145 }
146 if (style
147 && style->stroke.isPaintserver()
148 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
149 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
150 {
151 i ++;
152 }
154 for (SPObject *child = sp_object_first_child(o);
155 child != NULL; child = SP_OBJECT_NEXT(child)) {
156 i += count_gradient_hrefs(child, gr);
157 }
159 return i;
160 }
163 /**
164 * If gr has other users, create a new private; also check if gr links to vector, relink if not
165 */
166 SPGradient *
167 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
168 SPGradientType type, SPObject *o)
169 {
170 g_return_val_if_fail(gr != NULL, NULL);
171 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
173 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
174 // but i think we should not abort on this - maybe just write a validity warning into some sort
175 // of log
176 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
177 return (gr);
179 // user is the object that uses this gradient; normally it's item but for tspans, we
180 // check its ancestor text so that tspans don't get different gradients from their
181 // texts.
182 SPObject *user = o;
183 while (SP_IS_TSPAN(user)) {
184 user = SP_OBJECT_PARENT(user);
185 }
187 // Check the number of uses of the gradient within this object;
188 // if we are private and there are no other users,
189 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
190 // check vector
191 if ( gr != vector && gr->ref->getObject() != vector ) {
192 /* our href is not the vector, and vector is different from gr; relink */
193 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
194 }
195 return gr;
196 }
198 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
199 SPObject *defs = SP_DOCUMENT_DEFS(doc);
201 if ((gr->has_stops) ||
202 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
203 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
204 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
205 // we have to clone a fresh new private gradient for the given vector
207 // create an empty one
208 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
210 // copy all the attributes to it
211 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
212 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
213 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
214 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
215 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
216 if (SP_IS_RADIALGRADIENT(gr)) {
217 repr_new->setAttribute("cx", repr->attribute("cx"));
218 repr_new->setAttribute("cy", repr->attribute("cy"));
219 repr_new->setAttribute("fx", repr->attribute("fx"));
220 repr_new->setAttribute("fy", repr->attribute("fy"));
221 repr_new->setAttribute("r", repr->attribute("r"));
222 } else {
223 repr_new->setAttribute("x1", repr->attribute("x1"));
224 repr_new->setAttribute("y1", repr->attribute("y1"));
225 repr_new->setAttribute("x2", repr->attribute("x2"));
226 repr_new->setAttribute("y2", repr->attribute("y2"));
227 }
229 return gr_new;
230 } else {
231 return gr;
232 }
233 }
235 SPGradient *
236 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
237 {
238 // Some people actually prefer their gradient vectors to be shared...
239 if (prefs_get_int_attribute("options.forkgradientvectors", "value", 1) == 0)
240 return gr;
242 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
243 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
244 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
246 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate(xml_doc);
247 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (doc))->addChild(repr, NULL);
248 SPGradient *gr_new = (SPGradient *) doc->getObjectByRepr(repr);
249 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
250 Inkscape::GC::release(repr);
251 return gr_new;
252 }
253 return gr;
254 }
256 /**
257 * Obtain the vector from the gradient. A forked vector will be created and linked to this gradient if another gradient uses it.
258 */
259 SPGradient *
260 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
261 {
262 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
263 vector = sp_gradient_fork_vector_if_necessary (vector);
264 if ( gradient != vector && gradient->ref->getObject() != vector ) {
265 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
266 }
267 return vector;
268 }
271 /**
272 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
273 * instead. No forking or reapplying is done because this is only called for newly created privates.
274 * @return The new gradient.
275 */
276 SPGradient *
277 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
278 {
279 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
281 // calculate the bbox of the item
282 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
283 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
285 if ( !bbox || bbox->isEmpty() )
286 return gr;
288 NR::Coord const width = bbox->dimensions()[NR::X];
289 NR::Coord const height = bbox->dimensions()[NR::Y];
291 NR::Point const center = bbox->midpoint();
293 if (SP_IS_RADIALGRADIENT(gr)) {
294 sp_repr_set_svg_double(repr, "cx", center[NR::X]);
295 sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
296 sp_repr_set_svg_double(repr, "fx", center[NR::X]);
297 sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
298 sp_repr_set_svg_double(repr, "r", width/2);
300 // we want it to be elliptic, not circular
301 NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
302 NR::Matrix (NR::scale(1, height/width)) *
303 NR::Matrix (NR::translate (center));
305 gr->gradientTransform = squeeze;
306 {
307 gchar *c=sp_svg_transform_write(gr->gradientTransform);
308 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
309 g_free(c);
310 }
311 } else {
312 sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
313 sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
314 sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
315 sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
316 }
318 // set the gradientUnits
319 repr->setAttribute("gradientUnits", "userSpaceOnUse");
321 return gr;
322 }
324 /**
325 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
326 * @return The new gradient.
327 */
328 SPGradient *
329 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
330 {
331 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
333 // First, fork it if it is shared
334 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
335 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
337 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
339 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
341 // calculate the bbox of the item
342 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
343 NR::Matrix bbox2user;
344 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
345 if ( bbox && !bbox->isEmpty() ) {
346 bbox2user = NR::Matrix(bbox->dimensions()[NR::X], 0,
347 0, bbox->dimensions()[NR::Y],
348 bbox->min()[NR::X], bbox->min()[NR::Y]);
349 } else {
350 // would be degenerate otherwise
351 bbox2user = NR::identity();
352 }
354 /* skew is the additional transform, defined by the proportions of the item, that we need
355 * to apply to the gradient in order to work around this weird bit from SVG 1.1
356 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
357 *
358 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
359 * matrix, the stripes of the linear gradient are perpendicular to the gradient
360 * vector in object bounding box space (i.e., the abstract coordinate system where
361 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
362 * bottom/right of the object bounding box). When the object's bounding box is not
363 * square, the stripes that are conceptually perpendicular to the gradient vector
364 * within object bounding box space will render non-perpendicular relative to the
365 * gradient vector in user space due to application of the non-uniform scaling
366 * transformation from bounding box space to user space.
367 */
368 NR::Matrix skew = bbox2user;
369 double exp = skew.expansion();
370 skew[0] /= exp;
371 skew[1] /= exp;
372 skew[2] /= exp;
373 skew[3] /= exp;
374 skew[4] = 0;
375 skew[5] = 0;
377 // apply skew to the gradient
378 gr->gradientTransform = skew;
379 {
380 gchar *c=sp_svg_transform_write(gr->gradientTransform);
381 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
382 g_free(c);
383 }
385 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
386 // as to cancel it out when it's applied to the gradient during rendering
387 NR::Matrix point_convert = bbox2user * skew.inverse();
389 if (SP_IS_RADIALGRADIENT(gr)) {
390 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
392 // original points in the bbox coords
393 NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
394 NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
395 double r_b = rg->r.computed;
397 // converted points in userspace coords
398 NR::Point c_u = c_b * point_convert;
399 NR::Point f_u = f_b * point_convert;
400 double r_u = r_b * point_convert.expansion();
402 sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
403 sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
404 sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
405 sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
406 sp_repr_set_svg_double(repr, "r", r_u);
408 } else {
409 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
411 NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
412 NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
414 NR::Point p1_u = p1_b * point_convert;
415 NR::Point p2_u = p2_b * point_convert;
417 sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
418 sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
419 sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
420 sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
421 }
423 // set the gradientUnits
424 repr->setAttribute("gradientUnits", "userSpaceOnUse");
425 }
427 // apply the gradient to the item (may be necessary if we forked it); not recursive
428 // generally because grouped items will be taken care of later (we're being called
429 // from sp_item_adjust_paint_recursive); however text and all its children should all
430 // refer to one gradient, hence the recursive call for text (because we can't/don't
431 // want to access tspans and set gradients on them separately)
432 if (SP_IS_TEXT(item))
433 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
434 else
435 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
437 return gr;
438 }
440 void
441 sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
442 {
443 if (set) {
444 gradient->gradientTransform = postmul;
445 } else {
446 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
447 }
448 gradient->gradientTransform_set = TRUE;
450 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
451 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
452 g_free(c);
453 }
455 SPGradient *
456 sp_item_gradient (SPItem *item, bool fill_or_stroke)
457 {
458 SPStyle *style = SP_OBJECT_STYLE (item);
459 SPGradient *gradient = NULL;
461 if (fill_or_stroke) {
462 if (style && (style->fill.isPaintserver())) {
463 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
464 if (SP_IS_GRADIENT (server)) {
465 gradient = SP_GRADIENT (server);
466 }
467 }
468 } else {
469 if (style && (style->stroke.isPaintserver())) {
470 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
471 if (SP_IS_GRADIENT (server)) {
472 gradient = SP_GRADIENT (server);
473 }
474 }
475 }
477 return gradient;
478 }
481 SPStop*
482 sp_first_stop(SPGradient *gradient)
483 {
484 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
485 if (SP_IS_STOP (ochild))
486 return SP_STOP(ochild);
487 }
488 return NULL;
489 }
491 SPStop*
492 sp_prev_stop(SPStop *stop, SPGradient *gradient)
493 {
494 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
495 return NULL;
496 SPObject *found = NULL;
497 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
498 if (SP_IS_STOP (ochild)) {
499 found = ochild;
500 }
501 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
502 break;
503 }
504 }
505 return SP_STOP(found);
506 }
508 SPStop*
509 sp_next_stop(SPStop *stop)
510 {
511 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
512 if (SP_IS_STOP (ochild))
513 return SP_STOP(ochild);
514 }
515 return NULL;
516 }
518 SPStop*
519 sp_last_stop(SPGradient *gradient)
520 {
521 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
522 if (sp_next_stop (stop) == NULL)
523 return stop;
524 }
525 return NULL;
526 }
528 guint
529 sp_number_of_stops(SPGradient *gradient)
530 {
531 guint n = 0;
532 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
533 if (sp_next_stop (stop) == NULL)
534 return n;
535 n ++;
536 }
537 return n;
538 }
540 guint
541 sp_number_of_stops_before_stop(SPGradient *gradient, SPStop *target)
542 {
543 guint n = 0;
544 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
545 if (stop == target)
546 return n;
547 n ++;
548 }
549 return n;
550 }
553 SPStop*
554 sp_get_stop_i(SPGradient *gradient, guint stop_i)
555 {
556 SPStop *stop = sp_first_stop (gradient);
558 for (guint i=0; i < stop_i; i++) {
559 if (!stop) return NULL;
560 stop = sp_next_stop (stop);
561 }
563 return stop;
564 }
566 guint32
567 average_color (guint32 c1, guint32 c2, gdouble p)
568 {
569 guint32 r = (guint32) (SP_RGBA32_R_U (c1) * (1 - p) + SP_RGBA32_R_U (c2) * p);
570 guint32 g = (guint32) (SP_RGBA32_G_U (c1) * (1 - p) + SP_RGBA32_G_U (c2) * p);
571 guint32 b = (guint32) (SP_RGBA32_B_U (c1) * (1 - p) + SP_RGBA32_B_U (c2) * p);
572 guint32 a = (guint32) (SP_RGBA32_A_U (c1) * (1 - p) + SP_RGBA32_A_U (c2) * p);
574 return SP_RGBA32_U_COMPOSE (r, g, b, a);
575 }
577 SPStop *
578 sp_vector_add_stop (SPGradient *vector, SPStop* prev_stop, SPStop* next_stop, gfloat offset)
579 {
580 Inkscape::XML::Node *new_stop_repr = NULL;
581 new_stop_repr = SP_OBJECT_REPR(prev_stop)->duplicate(SP_OBJECT_REPR(vector)->document());
582 SP_OBJECT_REPR(vector)->addChild(new_stop_repr, SP_OBJECT_REPR(prev_stop));
584 SPStop *newstop = (SPStop *) SP_OBJECT_DOCUMENT(vector)->getObjectByRepr(new_stop_repr);
585 newstop->offset = offset;
586 sp_repr_set_css_double( SP_OBJECT_REPR(newstop), "offset", (double)offset);
587 guint32 const c1 = sp_stop_get_rgba32(prev_stop);
588 guint32 const c2 = sp_stop_get_rgba32(next_stop);
589 guint32 cnew = average_color (c1, c2, (offset - prev_stop->offset) / (next_stop->offset - prev_stop->offset));
590 Inkscape::CSSOStringStream os;
591 gchar c[64];
592 sp_svg_write_color (c, sizeof(c), cnew);
593 gdouble opacity = (gdouble) SP_RGBA32_A_F (cnew);
594 os << "stop-color:" << c << ";stop-opacity:" << opacity <<";";
595 SP_OBJECT_REPR (newstop)->setAttribute("style", os.str().c_str());
596 Inkscape::GC::release(new_stop_repr);
598 return newstop;
599 }
601 void
602 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
603 {
604 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
606 if (!gradient || !SP_IS_GRADIENT(gradient))
607 return;
609 SPGradient *vector = sp_gradient_get_vector (gradient, false);
610 switch (point_type) {
611 case POINT_LG_BEGIN:
612 case POINT_RG_CENTER:
613 case POINT_RG_FOCUS:
614 {
615 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
616 gtk_widget_show (dialog);
617 }
618 break;
620 case POINT_LG_END:
621 case POINT_RG_R1:
622 case POINT_RG_R2:
623 {
624 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
625 gtk_widget_show (dialog);
626 }
627 break;
629 case POINT_LG_MID:
630 case POINT_RG_MID1:
631 case POINT_RG_MID2:
632 {
633 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
634 gtk_widget_show (dialog);
635 }
636 break;
637 default:
638 break;
639 }
640 }
642 guint32
643 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
644 {
645 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
647 if (!gradient || !SP_IS_GRADIENT(gradient))
648 return 0;
650 SPGradient *vector = sp_gradient_get_vector (gradient, false);
652 if (!vector) // orphan!
653 return 0; // what else to do?
655 switch (point_type) {
656 case POINT_LG_BEGIN:
657 case POINT_RG_CENTER:
658 case POINT_RG_FOCUS:
659 {
660 SPStop *first = sp_first_stop (vector);
661 if (first) {
662 return sp_stop_get_rgba32(first);
663 }
664 }
665 break;
667 case POINT_LG_END:
668 case POINT_RG_R1:
669 case POINT_RG_R2:
670 {
671 SPStop *last = sp_last_stop (vector);
672 if (last) {
673 return sp_stop_get_rgba32(last);
674 }
675 }
676 break;
678 case POINT_LG_MID:
679 case POINT_RG_MID1:
680 case POINT_RG_MID2:
681 {
682 SPStop *stopi = sp_get_stop_i (vector, point_i);
683 if (stopi) {
684 return sp_stop_get_rgba32(stopi);
685 }
686 }
687 break;
689 default:
690 break;
691 }
692 return 0;
693 }
695 void
696 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
697 {
698 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
700 if (!gradient || !SP_IS_GRADIENT(gradient))
701 return;
703 SPGradient *vector = sp_gradient_get_vector (gradient, false);
705 if (!vector) // orphan!
706 return;
708 vector = sp_gradient_fork_vector_if_necessary (vector);
709 if ( gradient != vector && gradient->ref->getObject() != vector ) {
710 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
711 }
713 switch (point_type) {
714 case POINT_LG_BEGIN:
715 case POINT_RG_CENTER:
716 case POINT_RG_FOCUS:
717 {
718 SPStop *first = sp_first_stop (vector);
719 if (first) {
720 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
721 }
722 }
723 break;
725 case POINT_LG_END:
726 case POINT_RG_R1:
727 case POINT_RG_R2:
728 {
729 SPStop *last = sp_last_stop (vector);
730 if (last) {
731 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
732 }
733 }
734 break;
736 case POINT_LG_MID:
737 case POINT_RG_MID1:
738 case POINT_RG_MID2:
739 {
740 SPStop *stopi = sp_get_stop_i (vector, point_i);
741 if (stopi) {
742 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
743 }
744 }
745 break;
747 default:
748 break;
749 }
750 }
752 void
753 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
754 {
755 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
756 if (!gradient || !SP_IS_GRADIENT(gradient))
757 return;
759 SPGradient *vector = sp_gradient_get_vector (gradient, false);
760 if (!vector) // orphan!
761 return;
763 vector = sp_gradient_fork_vector_if_necessary (vector);
764 if ( gradient != vector && gradient->ref->getObject() != vector ) {
765 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
766 }
768 GSList *child_reprs = NULL;
769 GSList *child_objects = NULL;
770 std::vector<double> offsets;
771 for (SPObject *child = sp_object_first_child(vector);
772 child != NULL; child = SP_OBJECT_NEXT(child)) {
773 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
774 child_objects = g_slist_prepend (child_objects, child);
775 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
776 }
778 GSList *child_copies = NULL;
779 for (GSList *i = child_reprs; i != NULL; i = i->next) {
780 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
781 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
782 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
783 }
786 for (GSList *i = child_objects; i != NULL; i = i->next) {
787 SPObject *child = SP_OBJECT (i->data);
788 child->deleteObject();
789 }
791 std::vector<double>::iterator iter = offsets.end() - 1;
792 for (GSList *i = child_copies; i != NULL; i = i->next) {
793 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
794 vector->appendChildRepr(copy);
795 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
796 iter --;
797 Inkscape::GC::release(copy);
798 }
800 g_slist_free (child_reprs);
801 g_slist_free (child_copies);
802 g_slist_free (child_objects);
803 }
806 // FIXME: make general global function
807 static double
808 get_offset_between_points (NR::Point p, NR::Point begin, NR::Point end)
809 {
810 double length = NR::L2(end - begin);
811 NR::Point be = (end - begin) / length;
812 double r = NR::dot(p - begin, be);
814 if (r < 0.0) return 0.0;
815 if (r > length) return 1.0;
817 return (r / length);
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, NR::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 NR::Matrix i2d = sp_item_i2d_affine (item);
836 NR::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[NR::X]);
848 lg->y2.computed += (lg->y1.computed - p[NR::Y]);
849 }
850 lg->x1.computed = p[NR::X];
851 lg->y1.computed = p[NR::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[NR::X]);
866 lg->y1.computed += (lg->y2.computed - p[NR::Y]);
867 }
868 lg->x2.computed = p[NR::X];
869 lg->y2.computed = p[NR::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, NR::Point(lg->x1.computed, lg->y1.computed), NR::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 NR::Point c (rg->cx.computed, rg->cy.computed);
903 NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
904 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
905 // prevent setting a radius too close to the center
906 return;
907 }
908 NR::Matrix new_transform;
909 bool transform_set = false;
911 switch (point_type) {
912 case POINT_RG_CENTER:
913 rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
914 rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
915 rg->cx.computed = p[NR::X];
916 rg->cy.computed = p[NR::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[NR::X];
928 rg->fy.computed = p[NR::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 NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
939 double r1_angle = NR::atan2(r1_w - c_w);
940 double move_angle = NR::atan2(p_w - c_w) - r1_angle;
941 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
943 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
944 NR::Matrix (NR::rotate(-r1_angle)) *
945 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
946 NR::Matrix (NR::rotate(r1_angle)) *
947 NR::Matrix (NR::rotate(move_angle)) *
948 NR::Matrix (NR::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 NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
958 double r2_angle = NR::atan2(r2_w - c_w);
959 double move_angle = NR::atan2(p_w - c_w) - r2_angle;
960 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
962 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
963 NR::Matrix (NR::rotate(-r2_angle)) *
964 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
965 NR::Matrix (NR::rotate(r2_angle)) *
966 NR::Matrix (NR::rotate(move_angle)) *
967 NR::Matrix (NR::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 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
977 NR::Point end = NR::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 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
993 NR::Point end = NR::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 }
1007 if (transform_set) {
1008 gradient->gradientTransform = new_transform;
1009 gradient->gradientTransform_set = TRUE;
1010 if (write_repr) {
1011 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
1012 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
1013 g_free(s);
1014 } else {
1015 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
1016 }
1017 }
1018 }
1019 }
1021 SPGradient *
1022 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
1023 {
1024 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1026 if (gradient)
1027 return sp_gradient_get_vector (gradient, false);
1028 return NULL;
1029 }
1031 SPGradientSpread
1032 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
1033 {
1034 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1036 if (gradient)
1037 return sp_gradient_get_spread (gradient);
1038 return SP_GRADIENT_SPREAD_PAD;
1039 }
1042 /**
1043 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
1044 in desktop coordinates.
1045 */
1047 NR::Point
1048 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
1049 {
1050 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1052 NR::Point p (0, 0);
1054 if (!gradient)
1055 return p;
1057 if (SP_IS_LINEARGRADIENT(gradient)) {
1058 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
1059 switch (point_type) {
1060 case POINT_LG_BEGIN:
1061 p = NR::Point (lg->x1.computed, lg->y1.computed);
1062 break;
1063 case POINT_LG_END:
1064 p = NR::Point (lg->x2.computed, lg->y2.computed);
1065 break;
1066 case POINT_LG_MID:
1067 {
1068 gdouble offset = lg->vector.stops.at(point_i).offset;
1069 p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
1070 }
1071 break;
1072 }
1073 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1074 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1075 switch (point_type) {
1076 case POINT_RG_CENTER:
1077 p = NR::Point (rg->cx.computed, rg->cy.computed);
1078 break;
1079 case POINT_RG_FOCUS:
1080 p = NR::Point (rg->fx.computed, rg->fy.computed);
1081 break;
1082 case POINT_RG_R1:
1083 p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1084 break;
1085 case POINT_RG_R2:
1086 p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1087 break;
1088 case POINT_RG_MID1:
1089 {
1090 gdouble offset = rg->vector.stops.at(point_i).offset;
1091 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1092 }
1093 break;
1094 case POINT_RG_MID2:
1095 {
1096 gdouble offset = rg->vector.stops.at(point_i).offset;
1097 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1098 }
1099 break;
1100 }
1101 }
1103 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1104 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1105 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
1106 if (bbox) {
1107 p *= NR::Matrix(bbox->dimensions()[NR::X], 0,
1108 0, bbox->dimensions()[NR::Y],
1109 bbox->min()[NR::X], bbox->min()[NR::Y]);
1110 }
1111 }
1112 p *= NR::Matrix(gradient->gradientTransform) * sp_item_i2d_affine(item);
1113 return p;
1114 }
1117 /**
1118 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1119 * new private gradient, if needed.
1120 * gr has to be a normalized vector.
1121 */
1123 SPGradient *
1124 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1125 {
1126 g_return_val_if_fail(item != NULL, NULL);
1127 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1128 g_return_val_if_fail(gr != NULL, NULL);
1129 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1130 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1132 SPStyle *style = SP_OBJECT_STYLE(item);
1133 g_assert(style != NULL);
1135 SPPaintServer *ps = NULL;
1136 if (is_fill? style->fill.isPaintserver() : style->stroke.isPaintserver())
1137 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1139 if (ps
1140 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1141 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1142 {
1144 /* Current fill style is the gradient of the required type */
1145 SPGradient *current = SP_GRADIENT(ps);
1147 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1149 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1150 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1152 // current is private and it's either used once, or all its uses are by children of item;
1153 // so just change its href to vector
1155 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1156 /* href is not the vector */
1157 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1158 }
1159 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1160 return current;
1162 } else {
1164 // the gradient is not private, or it is shared with someone else;
1165 // normalize it (this includes creating new private if necessary)
1166 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1168 g_return_val_if_fail(normalized != NULL, NULL);
1170 if (normalized != current) {
1172 /* We have to change object style here; recursive because this is used from
1173 * fill&stroke and must work for groups etc. */
1174 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1175 }
1176 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1177 return normalized;
1178 }
1180 } else {
1181 /* Current fill style is not a gradient or wrong type, so construct everything */
1182 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1183 constructed = sp_gradient_reset_to_userspace(constructed, item);
1184 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1185 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1186 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1187 return constructed;
1188 }
1189 }
1191 static void
1192 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1193 {
1194 g_return_if_fail(repr != NULL);
1195 g_return_if_fail(link != NULL);
1196 g_return_if_fail(SP_IS_GRADIENT(link));
1198 gchar *ref;
1199 if (link) {
1200 gchar const *id = SP_OBJECT_ID(link);
1201 size_t const len = strlen(id);
1202 ref = (gchar*) alloca(len + 2);
1203 *ref = '#';
1204 memcpy(ref + 1, id, len + 1);
1205 } else {
1206 ref = NULL;
1207 }
1209 repr->setAttribute("xlink:href", ref);
1210 }
1212 /*
1213 * Get default normalized gradient vector of document, create if there is none
1214 */
1216 SPGradient *
1217 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1218 {
1219 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1220 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1222 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1224 repr->setAttribute("inkscape:collect", "always");
1225 // set here, but removed when it's edited in the gradient editor
1226 // to further reduce clutter, we could
1227 // (1) here, search gradients by color and return what is found without duplication
1228 // (2) in fill & stroke, show only one copy of each gradient in list
1230 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1232 gchar b[64];
1233 sp_svg_write_color(b, sizeof(b), color);
1235 {
1236 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1237 stop->setAttribute("style", t);
1238 g_free(t);
1239 }
1241 stop->setAttribute("offset", "0");
1243 repr->appendChild(stop);
1244 Inkscape::GC::release(stop);
1246 stop = xml_doc->createElement("svg:stop");
1248 {
1249 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1250 stop->setAttribute("style", t);
1251 g_free(t);
1252 }
1254 stop->setAttribute("offset", "1");
1256 repr->appendChild(stop);
1257 Inkscape::GC::release(stop);
1259 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1260 Inkscape::GC::release(repr);
1262 /* fixme: This does not look like nice */
1263 SPGradient *gr;
1264 gr = (SPGradient *) document->getObjectByRepr(repr);
1265 g_assert(gr != NULL);
1266 g_assert(SP_IS_GRADIENT(gr));
1267 /* fixme: Maybe add extra sanity check here */
1268 gr->state = SP_GRADIENT_STATE_VECTOR;
1270 return gr;
1271 }
1273 /**
1274 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1275 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1276 */
1277 SPGradient *
1278 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1279 SPObject *const o, bool const is_fill)
1280 {
1281 guint32 rgba = 0;
1282 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1283 rgba = sp_desktop_get_color(desktop, is_fill);
1284 } else {
1285 // take the color of the object
1286 SPStyle const &style = *SP_OBJECT_STYLE(o);
1287 SPIPaint const &paint = ( is_fill
1288 ? style.fill
1289 : style.stroke );
1290 if (paint.isPaintserver()) {
1291 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1292 if (SP_IS_GRADIENT (server)) {
1293 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1294 } else {
1295 rgba = sp_desktop_get_color(desktop, is_fill);
1296 }
1297 } else if (paint.isColor()) {
1298 rgba = paint.value.color.toRGBA32( 0xff );
1299 } else {
1300 // if o doesn't use flat color, then take current color of the desktop.
1301 rgba = sp_desktop_get_color(desktop, is_fill);
1302 }
1303 }
1305 return sp_document_default_gradient_vector(doc, rgba);
1306 }
1309 /*
1310 Local Variables:
1311 mode:c++
1312 c-file-style:"stroustrup"
1313 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1314 indent-tabs-mode:nil
1315 fill-column:99
1316 End:
1317 */
1318 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :