df013fdfc95516ee08924d1ae08cc194bffc89d0
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"
39 // Terminology:
40 //
41 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
42 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
43 //
44 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
45 // radial). It references a vector for the actual colors. Each private is only used by one
46 // object. It is either linear or radial.
48 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
50 SPGradient *
51 sp_gradient_ensure_vector_normalized(SPGradient *gr)
52 {
53 g_return_val_if_fail(gr != NULL, NULL);
54 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
56 /* If we are already normalized vector, just return */
57 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
58 /* Fail, if we have wrong state set */
59 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
60 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, SP_OBJECT_ID(gr));
61 return NULL;
62 }
64 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
65 if (!gr->has_stops) {
66 /* We do not have stops ourselves, so flatten stops as well */
67 sp_gradient_ensure_vector(gr);
68 g_assert(gr->vector.built);
69 // this adds stops from gr->vector as children to gr
70 sp_gradient_repr_write_vector (gr);
71 }
73 /* If gr hrefs some other gradient, remove the href */
74 if (gr->ref->getObject()) {
75 /* We are hrefing someone, so require flattening */
76 SP_OBJECT(gr)->updateRepr(((SPObject *) gr)->repr, SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
77 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
78 }
80 /* Everything is OK, set state flag */
81 gr->state = SP_GRADIENT_STATE_VECTOR;
82 return gr;
83 }
85 /**
86 * Creates new private gradient for the given vector
87 */
89 static SPGradient *
90 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
91 {
92 g_return_val_if_fail(document != NULL, NULL);
93 g_return_val_if_fail(vector != NULL, NULL);
94 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
95 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
97 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
99 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
100 // create a new private gradient of the requested type
101 Inkscape::XML::Node *repr;
102 if (type == SP_GRADIENT_TYPE_LINEAR) {
103 repr = xml_doc->createElement("svg:linearGradient");
104 } else {
105 repr = xml_doc->createElement("svg:radialGradient");
106 }
108 // privates are garbage-collectable
109 repr->setAttribute("inkscape:collect", "always");
111 // link to vector
112 sp_gradient_repr_set_link(repr, vector);
114 /* Append the new private gradient to defs */
115 SP_OBJECT_REPR(defs)->appendChild(repr);
116 Inkscape::GC::release(repr);
118 // get corresponding object
119 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
120 g_assert(gr != NULL);
121 g_assert(SP_IS_GRADIENT(gr));
123 return gr;
124 }
126 /**
127 Count how many times gr is used by the styles of o and its descendants
128 */
129 guint
130 count_gradient_hrefs(SPObject *o, SPGradient *gr)
131 {
132 if (!o)
133 return 1;
135 guint i = 0;
137 SPStyle *style = SP_OBJECT_STYLE(o);
138 if (style
139 && style->fill.isPaintserver()
140 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
141 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
142 {
143 i ++;
144 }
145 if (style
146 && style->stroke.isPaintserver()
147 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
148 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
149 {
150 i ++;
151 }
153 for (SPObject *child = sp_object_first_child(o);
154 child != NULL; child = SP_OBJECT_NEXT(child)) {
155 i += count_gradient_hrefs(child, gr);
156 }
158 return i;
159 }
162 /**
163 * If gr has other users, create a new private; also check if gr links to vector, relink if not
164 */
165 SPGradient *
166 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
167 SPGradientType type, SPObject *o)
168 {
169 g_return_val_if_fail(gr != NULL, NULL);
170 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
172 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
173 // but i think we should not abort on this - maybe just write a validity warning into some sort
174 // of log
175 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
176 return (gr);
178 // user is the object that uses this gradient; normally it's item but for tspans, we
179 // check its ancestor text so that tspans don't get different gradients from their
180 // texts.
181 SPObject *user = o;
182 while (SP_IS_TSPAN(user)) {
183 user = SP_OBJECT_PARENT(user);
184 }
186 // Check the number of uses of the gradient within this object;
187 // if we are private and there are no other users,
188 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
189 // check vector
190 if ( gr != vector && gr->ref->getObject() != vector ) {
191 /* our href is not the vector, and vector is different from gr; relink */
192 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
193 }
194 return gr;
195 }
197 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
198 SPObject *defs = SP_DOCUMENT_DEFS(doc);
200 if ((gr->has_stops) ||
201 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
202 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
203 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
204 // we have to clone a fresh new private gradient for the given vector
206 // create an empty one
207 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
209 // copy all the attributes to it
210 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
211 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
212 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
213 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
214 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
215 if (SP_IS_RADIALGRADIENT(gr)) {
216 repr_new->setAttribute("cx", repr->attribute("cx"));
217 repr_new->setAttribute("cy", repr->attribute("cy"));
218 repr_new->setAttribute("fx", repr->attribute("fx"));
219 repr_new->setAttribute("fy", repr->attribute("fy"));
220 repr_new->setAttribute("r", repr->attribute("r"));
221 } else {
222 repr_new->setAttribute("x1", repr->attribute("x1"));
223 repr_new->setAttribute("y1", repr->attribute("y1"));
224 repr_new->setAttribute("x2", repr->attribute("x2"));
225 repr_new->setAttribute("y2", repr->attribute("y2"));
226 }
228 return gr_new;
229 } else {
230 return gr;
231 }
232 }
234 SPGradient *
235 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
236 {
237 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
238 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
239 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
241 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate(xml_doc);
242 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (doc))->addChild(repr, NULL);
243 SPGradient *gr_new = (SPGradient *) doc->getObjectByRepr(repr);
244 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
245 Inkscape::GC::release(repr);
246 return gr_new;
247 }
248 return gr;
249 }
251 /**
252 * Obtain the vector from the gradient. A forked vector will be created and linked to this gradient if another gradient uses it.
253 */
254 SPGradient *
255 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
256 {
257 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
258 vector = sp_gradient_fork_vector_if_necessary (vector);
259 if ( gradient != vector && gradient->ref->getObject() != vector ) {
260 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
261 }
262 return vector;
263 }
266 /**
267 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
268 * instead. No forking or reapplying is done because this is only called for newly created privates.
269 * @return The new gradient.
270 */
271 SPGradient *
272 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
273 {
274 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
276 // calculate the bbox of the item
277 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
278 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
280 if ( !bbox || bbox->isEmpty() )
281 return gr;
283 NR::Coord const width = bbox->dimensions()[NR::X];
284 NR::Coord const height = bbox->dimensions()[NR::Y];
286 NR::Point const center = bbox->midpoint();
288 if (SP_IS_RADIALGRADIENT(gr)) {
289 sp_repr_set_svg_double(repr, "cx", center[NR::X]);
290 sp_repr_set_svg_double(repr, "cy", center[NR::Y]);
291 sp_repr_set_svg_double(repr, "fx", center[NR::X]);
292 sp_repr_set_svg_double(repr, "fy", center[NR::Y]);
293 sp_repr_set_svg_double(repr, "r", width/2);
295 // we want it to be elliptic, not circular
296 NR::Matrix squeeze = NR::Matrix (NR::translate (-center)) *
297 NR::Matrix (NR::scale(1, height/width)) *
298 NR::Matrix (NR::translate (center));
300 gr->gradientTransform = squeeze;
301 {
302 gchar *c=sp_svg_transform_write(gr->gradientTransform);
303 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
304 g_free(c);
305 }
306 } else {
307 sp_repr_set_svg_double(repr, "x1", (center - NR::Point(width/2, 0))[NR::X]);
308 sp_repr_set_svg_double(repr, "y1", (center - NR::Point(width/2, 0))[NR::Y]);
309 sp_repr_set_svg_double(repr, "x2", (center + NR::Point(width/2, 0))[NR::X]);
310 sp_repr_set_svg_double(repr, "y2", (center + NR::Point(width/2, 0))[NR::Y]);
311 }
313 // set the gradientUnits
314 repr->setAttribute("gradientUnits", "userSpaceOnUse");
316 return gr;
317 }
319 /**
320 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
321 * @return The new gradient.
322 */
323 SPGradient *
324 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
325 {
326 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
328 // First, fork it if it is shared
329 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
330 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
332 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
334 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
336 // calculate the bbox of the item
337 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
338 NR::Matrix bbox2user;
339 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
340 if ( bbox && !bbox->isEmpty() ) {
341 bbox2user = NR::Matrix(bbox->dimensions()[NR::X], 0,
342 0, bbox->dimensions()[NR::Y],
343 bbox->min()[NR::X], bbox->min()[NR::Y]);
344 } else {
345 // would be degenerate otherwise
346 bbox2user = NR::identity();
347 }
349 /* skew is the additional transform, defined by the proportions of the item, that we need
350 * to apply to the gradient in order to work around this weird bit from SVG 1.1
351 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
352 *
353 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
354 * matrix, the stripes of the linear gradient are perpendicular to the gradient
355 * vector in object bounding box space (i.e., the abstract coordinate system where
356 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
357 * bottom/right of the object bounding box). When the object's bounding box is not
358 * square, the stripes that are conceptually perpendicular to the gradient vector
359 * within object bounding box space will render non-perpendicular relative to the
360 * gradient vector in user space due to application of the non-uniform scaling
361 * transformation from bounding box space to user space.
362 */
363 NR::Matrix skew = bbox2user;
364 double exp = skew.expansion();
365 skew[0] /= exp;
366 skew[1] /= exp;
367 skew[2] /= exp;
368 skew[3] /= exp;
369 skew[4] = 0;
370 skew[5] = 0;
372 // apply skew to the gradient
373 gr->gradientTransform = skew;
374 {
375 gchar *c=sp_svg_transform_write(gr->gradientTransform);
376 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
377 g_free(c);
378 }
380 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
381 // as to cancel it out when it's applied to the gradient during rendering
382 NR::Matrix point_convert = bbox2user * skew.inverse();
384 if (SP_IS_RADIALGRADIENT(gr)) {
385 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
387 // original points in the bbox coords
388 NR::Point c_b = NR::Point(rg->cx.computed, rg->cy.computed);
389 NR::Point f_b = NR::Point(rg->fx.computed, rg->fy.computed);
390 double r_b = rg->r.computed;
392 // converted points in userspace coords
393 NR::Point c_u = c_b * point_convert;
394 NR::Point f_u = f_b * point_convert;
395 double r_u = r_b * point_convert.expansion();
397 sp_repr_set_svg_double(repr, "cx", c_u[NR::X]);
398 sp_repr_set_svg_double(repr, "cy", c_u[NR::Y]);
399 sp_repr_set_svg_double(repr, "fx", f_u[NR::X]);
400 sp_repr_set_svg_double(repr, "fy", f_u[NR::Y]);
401 sp_repr_set_svg_double(repr, "r", r_u);
403 } else {
404 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
406 NR::Point p1_b = NR::Point(lg->x1.computed, lg->y1.computed);
407 NR::Point p2_b = NR::Point(lg->x2.computed, lg->y2.computed);
409 NR::Point p1_u = p1_b * point_convert;
410 NR::Point p2_u = p2_b * point_convert;
412 sp_repr_set_svg_double(repr, "x1", p1_u[NR::X]);
413 sp_repr_set_svg_double(repr, "y1", p1_u[NR::Y]);
414 sp_repr_set_svg_double(repr, "x2", p2_u[NR::X]);
415 sp_repr_set_svg_double(repr, "y2", p2_u[NR::Y]);
416 }
418 // set the gradientUnits
419 repr->setAttribute("gradientUnits", "userSpaceOnUse");
420 }
422 // apply the gradient to the item (may be necessary if we forked it); not recursive
423 // generally because grouped items will be taken care of later (we're being called
424 // from sp_item_adjust_paint_recursive); however text and all its children should all
425 // refer to one gradient, hence the recursive call for text (because we can't/don't
426 // want to access tspans and set gradients on them separately)
427 if (SP_IS_TEXT(item))
428 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
429 else
430 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
432 return gr;
433 }
435 void
436 sp_gradient_transform_multiply(SPGradient *gradient, NR::Matrix postmul, bool set)
437 {
438 if (set) {
439 gradient->gradientTransform = postmul;
440 } else {
441 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
442 }
443 gradient->gradientTransform_set = TRUE;
445 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
446 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
447 g_free(c);
448 }
450 SPGradient *
451 sp_item_gradient (SPItem *item, bool fill_or_stroke)
452 {
453 SPStyle *style = SP_OBJECT_STYLE (item);
454 SPGradient *gradient = NULL;
456 if (fill_or_stroke) {
457 if (style && (style->fill.isPaintserver())) {
458 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
459 if (SP_IS_GRADIENT (server)) {
460 gradient = SP_GRADIENT (server);
461 }
462 }
463 } else {
464 if (style && (style->stroke.isPaintserver())) {
465 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
466 if (SP_IS_GRADIENT (server)) {
467 gradient = SP_GRADIENT (server);
468 }
469 }
470 }
472 return gradient;
473 }
476 SPStop*
477 sp_first_stop(SPGradient *gradient)
478 {
479 for (SPObject *ochild = sp_object_first_child(gradient); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
480 if (SP_IS_STOP (ochild))
481 return SP_STOP(ochild);
482 }
483 return NULL;
484 }
486 SPStop*
487 sp_prev_stop(SPStop *stop, SPGradient *gradient)
488 {
489 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop))
490 return NULL;
491 SPObject *found = NULL;
492 for ( SPObject *ochild = sp_object_first_child(SP_OBJECT(gradient)) ; ochild != NULL ; ochild = SP_OBJECT_NEXT(ochild) ) {
493 if (SP_IS_STOP (ochild)) {
494 found = ochild;
495 }
496 if (SP_OBJECT_NEXT(ochild) == SP_OBJECT(stop) || SP_OBJECT(ochild) == SP_OBJECT(stop)) {
497 break;
498 }
499 }
500 return SP_STOP(found);
501 }
503 SPStop*
504 sp_next_stop(SPStop *stop)
505 {
506 for (SPObject *ochild = SP_OBJECT_NEXT(stop); ochild != NULL; ochild = SP_OBJECT_NEXT(ochild)) {
507 if (SP_IS_STOP (ochild))
508 return SP_STOP(ochild);
509 }
510 return NULL;
511 }
513 SPStop*
514 sp_last_stop(SPGradient *gradient)
515 {
516 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
517 if (sp_next_stop (stop) == NULL)
518 return stop;
519 }
520 return NULL;
521 }
523 guint
524 sp_number_of_stops(SPGradient *gradient)
525 {
526 guint n = 0;
527 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
528 if (sp_next_stop (stop) == NULL)
529 return n;
530 n ++;
531 }
532 return n;
533 }
535 guint
536 sp_number_of_stops_before_stop(SPGradient *gradient, SPStop *target)
537 {
538 guint n = 0;
539 for (SPStop *stop = sp_first_stop (gradient); stop != NULL; stop = sp_next_stop (stop)) {
540 if (stop == target)
541 return n;
542 n ++;
543 }
544 return n;
545 }
548 SPStop*
549 sp_get_stop_i(SPGradient *gradient, guint stop_i)
550 {
551 SPStop *stop = sp_first_stop (gradient);
553 for (guint i=0; i < stop_i; i++) {
554 if (!stop) return NULL;
555 stop = sp_next_stop (stop);
556 }
558 return stop;
559 }
561 static guint32
562 average_color (guint32 c1, guint32 c2, gdouble p = 0.5)
563 {
564 guint32 r = (guint32) (SP_RGBA32_R_U (c1) * (1 - p) + SP_RGBA32_R_U (c2) * p);
565 guint32 g = (guint32) (SP_RGBA32_G_U (c1) * (1 - p) + SP_RGBA32_G_U (c2) * p);
566 guint32 b = (guint32) (SP_RGBA32_B_U (c1) * (1 - p) + SP_RGBA32_B_U (c2) * p);
567 guint32 a = (guint32) (SP_RGBA32_A_U (c1) * (1 - p) + SP_RGBA32_A_U (c2) * p);
569 return SP_RGBA32_U_COMPOSE (r, g, b, a);
570 }
572 SPStop *
573 sp_vector_add_stop (SPGradient *vector, SPStop* prev_stop, SPStop* next_stop, gfloat offset)
574 {
575 Inkscape::XML::Node *new_stop_repr = NULL;
576 new_stop_repr = SP_OBJECT_REPR(prev_stop)->duplicate(SP_OBJECT_REPR(vector)->document());
577 SP_OBJECT_REPR(vector)->addChild(new_stop_repr, SP_OBJECT_REPR(prev_stop));
579 SPStop *newstop = (SPStop *) SP_OBJECT_DOCUMENT(vector)->getObjectByRepr(new_stop_repr);
580 newstop->offset = offset;
581 sp_repr_set_css_double( SP_OBJECT_REPR(newstop), "offset", (double)offset);
582 guint32 const c1 = sp_stop_get_rgba32(prev_stop);
583 guint32 const c2 = sp_stop_get_rgba32(next_stop);
584 guint32 cnew = average_color (c1, c2, (offset - prev_stop->offset) / (next_stop->offset - prev_stop->offset));
585 Inkscape::CSSOStringStream os;
586 gchar c[64];
587 sp_svg_write_color (c, sizeof(c), cnew);
588 gdouble opacity = (gdouble) SP_RGBA32_A_F (cnew);
589 os << "stop-color:" << c << ";stop-opacity:" << opacity <<";";
590 SP_OBJECT_REPR (newstop)->setAttribute("style", os.str().c_str());
591 Inkscape::GC::release(new_stop_repr);
593 return newstop;
594 }
596 void
597 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
598 {
599 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
601 if (!gradient || !SP_IS_GRADIENT(gradient))
602 return;
604 SPGradient *vector = sp_gradient_get_vector (gradient, false);
605 switch (point_type) {
606 case POINT_LG_BEGIN:
607 case POINT_RG_CENTER:
608 case POINT_RG_FOCUS:
609 {
610 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_first_stop (vector));
611 gtk_widget_show (dialog);
612 }
613 break;
615 case POINT_LG_END:
616 case POINT_RG_R1:
617 case POINT_RG_R2:
618 {
619 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
620 gtk_widget_show (dialog);
621 }
622 break;
624 case POINT_LG_MID:
625 case POINT_RG_MID1:
626 case POINT_RG_MID2:
627 {
628 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
629 gtk_widget_show (dialog);
630 }
631 break;
632 default:
633 break;
634 }
635 }
637 guint32
638 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
639 {
640 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
642 if (!gradient || !SP_IS_GRADIENT(gradient))
643 return 0;
645 SPGradient *vector = sp_gradient_get_vector (gradient, false);
647 if (!vector) // orphan!
648 return 0; // what else to do?
650 switch (point_type) {
651 case POINT_LG_BEGIN:
652 case POINT_RG_CENTER:
653 case POINT_RG_FOCUS:
654 {
655 SPStop *first = sp_first_stop (vector);
656 if (first) {
657 return sp_stop_get_rgba32(first);
658 }
659 }
660 break;
662 case POINT_LG_END:
663 case POINT_RG_R1:
664 case POINT_RG_R2:
665 {
666 SPStop *last = sp_last_stop (vector);
667 if (last) {
668 return sp_stop_get_rgba32(last);
669 }
670 }
671 break;
673 case POINT_LG_MID:
674 case POINT_RG_MID1:
675 case POINT_RG_MID2:
676 {
677 SPStop *stopi = sp_get_stop_i (vector, point_i);
678 if (stopi) {
679 return sp_stop_get_rgba32(stopi);
680 }
681 }
682 break;
684 default:
685 break;
686 }
687 return 0;
688 }
690 void
691 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
692 {
693 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
695 if (!gradient || !SP_IS_GRADIENT(gradient))
696 return;
698 SPGradient *vector = sp_gradient_get_vector (gradient, false);
700 if (!vector) // orphan!
701 return;
703 vector = sp_gradient_fork_vector_if_necessary (vector);
704 if ( gradient != vector && gradient->ref->getObject() != vector ) {
705 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
706 }
708 switch (point_type) {
709 case POINT_LG_BEGIN:
710 case POINT_RG_CENTER:
711 case POINT_RG_FOCUS:
712 {
713 SPStop *first = sp_first_stop (vector);
714 if (first) {
715 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
716 }
717 }
718 break;
720 case POINT_LG_END:
721 case POINT_RG_R1:
722 case POINT_RG_R2:
723 {
724 SPStop *last = sp_last_stop (vector);
725 if (last) {
726 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
727 }
728 }
729 break;
731 case POINT_LG_MID:
732 case POINT_RG_MID1:
733 case POINT_RG_MID2:
734 {
735 SPStop *stopi = sp_get_stop_i (vector, point_i);
736 if (stopi) {
737 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
738 }
739 }
740 break;
742 default:
743 break;
744 }
745 }
747 void
748 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
749 {
750 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
751 if (!gradient || !SP_IS_GRADIENT(gradient))
752 return;
754 SPGradient *vector = sp_gradient_get_vector (gradient, false);
755 if (!vector) // orphan!
756 return;
758 vector = sp_gradient_fork_vector_if_necessary (vector);
759 if ( gradient != vector && gradient->ref->getObject() != vector ) {
760 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
761 }
763 GSList *child_reprs = NULL;
764 GSList *child_objects = NULL;
765 std::vector<double> offsets;
766 for (SPObject *child = sp_object_first_child(vector);
767 child != NULL; child = SP_OBJECT_NEXT(child)) {
768 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
769 child_objects = g_slist_prepend (child_objects, child);
770 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
771 }
773 GSList *child_copies = NULL;
774 for (GSList *i = child_reprs; i != NULL; i = i->next) {
775 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
776 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
777 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
778 }
781 for (GSList *i = child_objects; i != NULL; i = i->next) {
782 SPObject *child = SP_OBJECT (i->data);
783 child->deleteObject();
784 }
786 std::vector<double>::iterator iter = offsets.end() - 1;
787 for (GSList *i = child_copies; i != NULL; i = i->next) {
788 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
789 vector->appendChildRepr(copy);
790 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
791 iter --;
792 Inkscape::GC::release(copy);
793 }
795 g_slist_free (child_reprs);
796 g_slist_free (child_copies);
797 g_slist_free (child_objects);
798 }
801 // FIXME: make general global function
802 static double
803 get_offset_between_points (NR::Point p, NR::Point begin, NR::Point end)
804 {
805 double length = NR::L2(end - begin);
806 NR::Point be = (end - begin) / length;
807 double r = NR::dot(p - begin, be);
809 if (r < 0.0) return 0.0;
810 if (r > length) return 1.0;
812 return (r / length);
813 }
816 /**
817 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
818 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
819 */
820 void
821 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)
822 {
823 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
825 if (!gradient || !SP_IS_GRADIENT(gradient))
826 return;
828 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
830 NR::Matrix i2d = sp_item_i2d_affine (item);
831 NR::Point p = p_w * i2d.inverse();
832 p *= (gradient->gradientTransform).inverse();
833 // now p is in gradient's original coordinates
835 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
837 if (SP_IS_LINEARGRADIENT(gradient)) {
838 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
839 switch (point_type) {
840 case POINT_LG_BEGIN:
841 if (scale) {
842 lg->x2.computed += (lg->x1.computed - p[NR::X]);
843 lg->y2.computed += (lg->y1.computed - p[NR::Y]);
844 }
845 lg->x1.computed = p[NR::X];
846 lg->y1.computed = p[NR::Y];
847 if (write_repr) {
848 if (scale) {
849 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
850 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
851 }
852 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
853 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
854 } else {
855 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
856 }
857 break;
858 case POINT_LG_END:
859 if (scale) {
860 lg->x1.computed += (lg->x2.computed - p[NR::X]);
861 lg->y1.computed += (lg->y2.computed - p[NR::Y]);
862 }
863 lg->x2.computed = p[NR::X];
864 lg->y2.computed = p[NR::Y];
865 if (write_repr) {
866 if (scale) {
867 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
868 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
869 }
870 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
871 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
872 } else {
873 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
874 }
875 break;
876 case POINT_LG_MID:
877 {
878 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
879 double offset = get_offset_between_points (p, NR::Point(lg->x1.computed, lg->y1.computed), NR::Point(lg->x2.computed, lg->y2.computed));
880 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (lg, false);
881 sp_gradient_ensure_vector(lg);
882 lg->vector.stops.at(point_i).offset = offset;
883 SPStop* stopi = sp_get_stop_i(vector, point_i);
884 stopi->offset = offset;
885 if (write_repr) {
886 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
887 } else {
888 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
889 }
890 }
891 break;
892 default:
893 break;
894 }
895 } else if (SP_IS_RADIALGRADIENT(gradient)) {
896 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
897 NR::Point c (rg->cx.computed, rg->cy.computed);
898 NR::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
899 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && NR::L2 (p_w - c_w) < 1e-3) {
900 // prevent setting a radius too close to the center
901 return;
902 }
903 NR::Matrix new_transform;
904 bool transform_set = false;
906 switch (point_type) {
907 case POINT_RG_CENTER:
908 rg->fx.computed = p[NR::X] + (rg->fx.computed - rg->cx.computed);
909 rg->fy.computed = p[NR::Y] + (rg->fy.computed - rg->cy.computed);
910 rg->cx.computed = p[NR::X];
911 rg->cy.computed = p[NR::Y];
912 if (write_repr) {
913 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
914 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
915 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
916 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
917 } else {
918 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
919 }
920 break;
921 case POINT_RG_FOCUS:
922 rg->fx.computed = p[NR::X];
923 rg->fy.computed = p[NR::Y];
924 if (write_repr) {
925 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
926 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
927 } else {
928 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
929 }
930 break;
931 case POINT_RG_R1:
932 {
933 NR::Point r1_w = (c + NR::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
934 double r1_angle = NR::atan2(r1_w - c_w);
935 double move_angle = NR::atan2(p_w - c_w) - r1_angle;
936 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r1_w - c_w);
938 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
939 NR::Matrix (NR::rotate(-r1_angle)) *
940 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
941 NR::Matrix (NR::rotate(r1_angle)) *
942 NR::Matrix (NR::rotate(move_angle)) *
943 NR::Matrix (NR::translate (c_w));
945 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
946 transform_set = true;
948 break;
949 }
950 case POINT_RG_R2:
951 {
952 NR::Point r2_w = (c + NR::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
953 double r2_angle = NR::atan2(r2_w - c_w);
954 double move_angle = NR::atan2(p_w - c_w) - r2_angle;
955 double move_stretch = NR::L2(p_w - c_w) / NR::L2(r2_w - c_w);
957 NR::Matrix move = NR::Matrix (NR::translate (-c_w)) *
958 NR::Matrix (NR::rotate(-r2_angle)) *
959 NR::Matrix (NR::scale(move_stretch, scale? move_stretch : 1)) *
960 NR::Matrix (NR::rotate(r2_angle)) *
961 NR::Matrix (NR::rotate(move_angle)) *
962 NR::Matrix (NR::translate (c_w));
964 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
965 transform_set = true;
967 break;
968 }
969 case POINT_RG_MID1:
970 {
971 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
972 NR::Point end = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
973 double offset = get_offset_between_points (p, start, end);
974 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (rg, false);
975 sp_gradient_ensure_vector(rg);
976 rg->vector.stops.at(point_i).offset = offset;
977 SPStop* stopi = sp_get_stop_i(vector, point_i);
978 stopi->offset = offset;
979 if (write_repr) {
980 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
981 } else {
982 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
983 }
984 break;
985 }
986 case POINT_RG_MID2:
987 NR::Point start = NR::Point (rg->cx.computed, rg->cy.computed);
988 NR::Point end = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
989 double offset = get_offset_between_points (p, start, end);
990 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(rg, false);
991 sp_gradient_ensure_vector(rg);
992 rg->vector.stops.at(point_i).offset = offset;
993 SPStop* stopi = sp_get_stop_i(vector, point_i);
994 stopi->offset = offset;
995 if (write_repr) {
996 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
997 } else {
998 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
999 }
1000 break;
1001 }
1002 if (transform_set) {
1003 gradient->gradientTransform = new_transform;
1004 gradient->gradientTransform_set = TRUE;
1005 if (write_repr) {
1006 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
1007 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
1008 g_free(s);
1009 } else {
1010 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
1011 }
1012 }
1013 }
1014 }
1016 SPGradient *
1017 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
1018 {
1019 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1021 if (gradient)
1022 return sp_gradient_get_vector (gradient, false);
1023 return NULL;
1024 }
1026 SPGradientSpread
1027 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
1028 {
1029 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1031 if (gradient)
1032 return sp_gradient_get_spread (gradient);
1033 return SP_GRADIENT_SPREAD_PAD;
1034 }
1037 /**
1038 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
1039 in desktop coordinates.
1040 */
1042 NR::Point
1043 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
1044 {
1045 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1047 NR::Point p (0, 0);
1049 if (!gradient)
1050 return p;
1052 if (SP_IS_LINEARGRADIENT(gradient)) {
1053 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
1054 switch (point_type) {
1055 case POINT_LG_BEGIN:
1056 p = NR::Point (lg->x1.computed, lg->y1.computed);
1057 break;
1058 case POINT_LG_END:
1059 p = NR::Point (lg->x2.computed, lg->y2.computed);
1060 break;
1061 case POINT_LG_MID:
1062 {
1063 gdouble offset = lg->vector.stops.at(point_i).offset;
1064 p = (1-offset) * NR::Point(lg->x1.computed, lg->y1.computed) + offset * NR::Point(lg->x2.computed, lg->y2.computed);
1065 }
1066 break;
1067 }
1068 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1069 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1070 switch (point_type) {
1071 case POINT_RG_CENTER:
1072 p = NR::Point (rg->cx.computed, rg->cy.computed);
1073 break;
1074 case POINT_RG_FOCUS:
1075 p = NR::Point (rg->fx.computed, rg->fy.computed);
1076 break;
1077 case POINT_RG_R1:
1078 p = NR::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1079 break;
1080 case POINT_RG_R2:
1081 p = NR::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1082 break;
1083 case POINT_RG_MID1:
1084 {
1085 gdouble offset = rg->vector.stops.at(point_i).offset;
1086 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1087 }
1088 break;
1089 case POINT_RG_MID2:
1090 {
1091 gdouble offset = rg->vector.stops.at(point_i).offset;
1092 p = (1-offset) * NR::Point (rg->cx.computed, rg->cy.computed) + offset * NR::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1093 }
1094 break;
1095 }
1096 }
1098 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1099 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1100 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity()); // we need "true" bbox without item_i2d_affine
1101 if (bbox) {
1102 p *= NR::Matrix(bbox->dimensions()[NR::X], 0,
1103 0, bbox->dimensions()[NR::Y],
1104 bbox->min()[NR::X], bbox->min()[NR::Y]);
1105 }
1106 }
1107 p *= NR::Matrix(gradient->gradientTransform) * sp_item_i2d_affine(item);
1108 return p;
1109 }
1112 /**
1113 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1114 * new private gradient, if needed.
1115 * gr has to be a normalized vector.
1116 */
1118 SPGradient *
1119 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1120 {
1121 g_return_val_if_fail(item != NULL, NULL);
1122 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1123 g_return_val_if_fail(gr != NULL, NULL);
1124 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1125 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1127 SPStyle *style = SP_OBJECT_STYLE(item);
1128 g_assert(style != NULL);
1130 SPPaintServer *ps = NULL;
1131 if (is_fill? style->fill.isPaintserver() : style->stroke.isPaintserver())
1132 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1134 if (ps
1135 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1136 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1137 {
1139 /* Current fill style is the gradient of the required type */
1140 SPGradient *current = SP_GRADIENT(ps);
1142 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1144 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1145 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1147 // current is private and it's either used once, or all its uses are by children of item;
1148 // so just change its href to vector
1150 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1151 /* href is not the vector */
1152 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1153 }
1154 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1155 return current;
1157 } else {
1159 // the gradient is not private, or it is shared with someone else;
1160 // normalize it (this includes creating new private if necessary)
1161 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1163 g_return_val_if_fail(normalized != NULL, NULL);
1165 if (normalized != current) {
1167 /* We have to change object style here; recursive because this is used from
1168 * fill&stroke and must work for groups etc. */
1169 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1170 }
1171 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1172 return normalized;
1173 }
1175 } else {
1176 /* Current fill style is not a gradient or wrong type, so construct everything */
1177 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1178 constructed = sp_gradient_reset_to_userspace(constructed, item);
1179 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1180 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1181 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1182 return constructed;
1183 }
1184 }
1186 static void
1187 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1188 {
1189 g_return_if_fail(repr != NULL);
1190 g_return_if_fail(link != NULL);
1191 g_return_if_fail(SP_IS_GRADIENT(link));
1193 gchar *ref;
1194 if (link) {
1195 gchar const *id = SP_OBJECT_ID(link);
1196 size_t const len = strlen(id);
1197 ref = (gchar*) alloca(len + 2);
1198 *ref = '#';
1199 memcpy(ref + 1, id, len + 1);
1200 } else {
1201 ref = NULL;
1202 }
1204 repr->setAttribute("xlink:href", ref);
1205 }
1207 /*
1208 * Get default normalized gradient vector of document, create if there is none
1209 */
1211 SPGradient *
1212 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1213 {
1214 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1215 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1217 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1219 repr->setAttribute("inkscape:collect", "always");
1220 // set here, but removed when it's edited in the gradient editor
1221 // to further reduce clutter, we could
1222 // (1) here, search gradients by color and return what is found without duplication
1223 // (2) in fill & stroke, show only one copy of each gradient in list
1225 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1227 gchar b[64];
1228 sp_svg_write_color(b, sizeof(b), color);
1230 {
1231 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1232 stop->setAttribute("style", t);
1233 g_free(t);
1234 }
1236 stop->setAttribute("offset", "0");
1238 repr->appendChild(stop);
1239 Inkscape::GC::release(stop);
1241 stop = xml_doc->createElement("svg:stop");
1243 {
1244 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1245 stop->setAttribute("style", t);
1246 g_free(t);
1247 }
1249 stop->setAttribute("offset", "1");
1251 repr->appendChild(stop);
1252 Inkscape::GC::release(stop);
1254 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1255 Inkscape::GC::release(repr);
1257 /* fixme: This does not look like nice */
1258 SPGradient *gr;
1259 gr = (SPGradient *) document->getObjectByRepr(repr);
1260 g_assert(gr != NULL);
1261 g_assert(SP_IS_GRADIENT(gr));
1262 /* fixme: Maybe add extra sanity check here */
1263 gr->state = SP_GRADIENT_STATE_VECTOR;
1265 return gr;
1266 }
1268 /**
1269 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1270 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1271 */
1272 SPGradient *
1273 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1274 SPObject *const o, bool const is_fill)
1275 {
1276 guint32 rgba = 0;
1277 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1278 rgba = sp_desktop_get_color(desktop, is_fill);
1279 } else {
1280 // take the color of the object
1281 SPStyle const &style = *SP_OBJECT_STYLE(o);
1282 SPIPaint const &paint = ( is_fill
1283 ? style.fill
1284 : style.stroke );
1285 if (paint.isPaintserver()) {
1286 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1287 if (SP_IS_GRADIENT (server)) {
1288 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1289 } else {
1290 rgba = sp_desktop_get_color(desktop, is_fill);
1291 }
1292 } else if (paint.isColor()) {
1293 rgba = paint.value.color.toRGBA32( 0xff );
1294 } else {
1295 // if o doesn't use flat color, then take current color of the desktop.
1296 rgba = sp_desktop_get_color(desktop, is_fill);
1297 }
1298 }
1300 return sp_document_default_gradient_vector(doc, rgba);
1301 }
1304 /*
1305 Local Variables:
1306 mode:c++
1307 c-file-style:"stroustrup"
1308 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1309 indent-tabs-mode:nil
1310 fill-column:99
1311 End:
1312 */
1313 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :