1 /*
2 * Various utility methods for gradients
3 *
4 * Authors:
5 * Lauris Kaplinski <lauris@kaplinski.com>
6 * bulia byak
7 * Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
8 * Jon A. Cruz <jon@joncruz.org>
9 *
10 * Copyright (C) 2010 Authors
11 * Copyright (C) 2007 Johan Engelen
12 * Copyright (C) 2001-2005 authors
13 * Copyright (C) 2001 Ximian, Inc.
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
19 #include "style.h"
20 #include "document-private.h"
21 #include "desktop-style.h"
23 #include "sp-gradient-reference.h"
24 #include "sp-gradient-vector.h"
25 #include "sp-linear-gradient.h"
26 #include "sp-radial-gradient.h"
27 #include "sp-stop.h"
28 #include "widgets/gradient-vector.h"
30 #include "sp-text.h"
31 #include "sp-tspan.h"
32 #include <libnr/nr-matrix-fns.h>
33 #include <libnr/nr-point-fns.h>
34 #include <libnr/nr-matrix-ops.h>
35 #include <libnr/nr-rotate-ops.h>
36 #include <2geom/transforms.h>
37 #include "xml/repr.h"
38 #include "svg/svg.h"
39 #include "svg/svg-color.h"
40 #include "svg/css-ostringstream.h"
41 #include "preferences.h"
44 // Terminology:
45 //
46 // "vector" is a gradient that has stops but not position coords. It can be referenced by one or
47 // more privates. Objects should not refer to it directly. It has no radial/linear distinction.
48 //
49 // "private" is a gradient that has no stops but has position coords (e.g. center, radius etc for a
50 // radial). It references a vector for the actual colors. Each private is only used by one
51 // object. It is either linear or radial.
53 static void sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *gr);
55 SPGradient *
56 sp_gradient_ensure_vector_normalized(SPGradient *gr)
57 {
58 g_return_val_if_fail(gr != NULL, NULL);
59 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
61 /* If we are already normalized vector, just return */
62 if (gr->state == SP_GRADIENT_STATE_VECTOR) return gr;
63 /* Fail, if we have wrong state set */
64 if (gr->state != SP_GRADIENT_STATE_UNKNOWN) {
65 g_warning("file %s: line %d: Cannot normalize private gradient to vector (%s)", __FILE__, __LINE__, gr->getId());
66 return NULL;
67 }
69 /* First make sure we have vector directly defined (i.e. gr has its own stops) */
70 if (!gr->has_stops) {
71 /* We do not have stops ourselves, so flatten stops as well */
72 sp_gradient_ensure_vector(gr);
73 g_assert(gr->vector.built);
74 // this adds stops from gr->vector as children to gr
75 sp_gradient_repr_write_vector (gr);
76 }
78 /* If gr hrefs some other gradient, remove the href */
79 if (gr->ref->getObject()) {
80 /* We are hrefing someone, so require flattening */
81 SP_OBJECT(gr)->updateRepr(SP_OBJECT_WRITE_EXT | SP_OBJECT_WRITE_ALL);
82 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), NULL);
83 }
85 /* Everything is OK, set state flag */
86 gr->state = SP_GRADIENT_STATE_VECTOR;
87 return gr;
88 }
90 /**
91 * Creates new private gradient for the given vector
92 */
94 static SPGradient *
95 sp_gradient_get_private_normalized(SPDocument *document, SPGradient *vector, SPGradientType type)
96 {
97 g_return_val_if_fail(document != NULL, NULL);
98 g_return_val_if_fail(vector != NULL, NULL);
99 g_return_val_if_fail(SP_IS_GRADIENT(vector), NULL);
100 g_return_val_if_fail(SP_GRADIENT_HAS_STOPS(vector), NULL);
102 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
104 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
105 // create a new private gradient of the requested type
106 Inkscape::XML::Node *repr;
107 if (type == SP_GRADIENT_TYPE_LINEAR) {
108 repr = xml_doc->createElement("svg:linearGradient");
109 } else {
110 repr = xml_doc->createElement("svg:radialGradient");
111 }
113 // privates are garbage-collectable
114 repr->setAttribute("inkscape:collect", "always");
116 // link to vector
117 sp_gradient_repr_set_link(repr, vector);
119 /* Append the new private gradient to defs */
120 SP_OBJECT_REPR(defs)->appendChild(repr);
121 Inkscape::GC::release(repr);
123 // get corresponding object
124 SPGradient *gr = (SPGradient *) document->getObjectByRepr(repr);
125 g_assert(gr != NULL);
126 g_assert(SP_IS_GRADIENT(gr));
128 return gr;
129 }
131 /**
132 Count how many times gr is used by the styles of o and its descendants
133 */
134 guint
135 count_gradient_hrefs(SPObject *o, SPGradient *gr)
136 {
137 if (!o)
138 return 1;
140 guint i = 0;
142 SPStyle *style = SP_OBJECT_STYLE(o);
143 if (style
144 && style->fill.isPaintserver()
145 && SP_IS_GRADIENT(SP_STYLE_FILL_SERVER(style))
146 && SP_GRADIENT(SP_STYLE_FILL_SERVER(style)) == gr)
147 {
148 i ++;
149 }
150 if (style
151 && style->stroke.isPaintserver()
152 && SP_IS_GRADIENT(SP_STYLE_STROKE_SERVER(style))
153 && SP_GRADIENT(SP_STYLE_STROKE_SERVER(style)) == gr)
154 {
155 i ++;
156 }
158 for (SPObject *child = sp_object_first_child(o);
159 child != NULL; child = SP_OBJECT_NEXT(child)) {
160 i += count_gradient_hrefs(child, gr);
161 }
163 return i;
164 }
167 /**
168 * If gr has other users, create a new private; also check if gr links to vector, relink if not
169 */
170 SPGradient *
171 sp_gradient_fork_private_if_necessary(SPGradient *gr, SPGradient *vector,
172 SPGradientType type, SPObject *o)
173 {
174 g_return_val_if_fail(gr != NULL, NULL);
175 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
177 // Orphaned gradient, no vector with stops at the end of the line; this used to be an assert
178 // but i think we should not abort on this - maybe just write a validity warning into some sort
179 // of log
180 if (!vector || !SP_GRADIENT_HAS_STOPS(vector))
181 return (gr);
183 // user is the object that uses this gradient; normally it's item but for tspans, we
184 // check its ancestor text so that tspans don't get different gradients from their
185 // texts.
186 SPObject *user = o;
187 while (SP_IS_TSPAN(user)) {
188 user = SP_OBJECT_PARENT(user);
189 }
191 // Check the number of uses of the gradient within this object;
192 // if we are private and there are no other users,
193 if (SP_OBJECT_HREFCOUNT(gr) <= count_gradient_hrefs(user, gr)) {
194 // check vector
195 if ( gr != vector && gr->ref->getObject() != vector ) {
196 /* our href is not the vector, and vector is different from gr; relink */
197 sp_gradient_repr_set_link(SP_OBJECT_REPR(gr), vector);
198 }
199 return gr;
200 }
202 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
203 SPObject *defs = SP_DOCUMENT_DEFS(doc);
205 if ((gr->has_stops) ||
206 (gr->state != SP_GRADIENT_STATE_UNKNOWN) ||
207 (SP_OBJECT_PARENT(gr) != SP_OBJECT(defs)) ||
208 (SP_OBJECT_HREFCOUNT(gr) > 1)) {
209 // we have to clone a fresh new private gradient for the given vector
211 // create an empty one
212 SPGradient *gr_new = sp_gradient_get_private_normalized(doc, vector, type);
214 // copy all the attributes to it
215 Inkscape::XML::Node *repr_new = SP_OBJECT_REPR(gr_new);
216 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
217 repr_new->setAttribute("gradientUnits", repr->attribute("gradientUnits"));
218 repr_new->setAttribute("gradientTransform", repr->attribute("gradientTransform"));
219 repr_new->setAttribute("spreadMethod", repr->attribute("spreadMethod"));
220 if (SP_IS_RADIALGRADIENT(gr)) {
221 repr_new->setAttribute("cx", repr->attribute("cx"));
222 repr_new->setAttribute("cy", repr->attribute("cy"));
223 repr_new->setAttribute("fx", repr->attribute("fx"));
224 repr_new->setAttribute("fy", repr->attribute("fy"));
225 repr_new->setAttribute("r", repr->attribute("r"));
226 } else {
227 repr_new->setAttribute("x1", repr->attribute("x1"));
228 repr_new->setAttribute("y1", repr->attribute("y1"));
229 repr_new->setAttribute("x2", repr->attribute("x2"));
230 repr_new->setAttribute("y2", repr->attribute("y2"));
231 }
233 return gr_new;
234 } else {
235 return gr;
236 }
237 }
239 SPGradient *
240 sp_gradient_fork_vector_if_necessary (SPGradient *gr)
241 {
242 // Some people actually prefer their gradient vectors to be shared...
243 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
244 if (!prefs->getBool("/options/forkgradientvectors/value", true))
245 return gr;
247 if (SP_OBJECT_HREFCOUNT(gr) > 1) {
248 SPDocument *doc = SP_OBJECT_DOCUMENT(gr);
249 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
251 Inkscape::XML::Node *repr = SP_OBJECT_REPR (gr)->duplicate(xml_doc);
252 SP_OBJECT_REPR (SP_DOCUMENT_DEFS (doc))->addChild(repr, NULL);
253 SPGradient *gr_new = (SPGradient *) doc->getObjectByRepr(repr);
254 gr_new = sp_gradient_ensure_vector_normalized (gr_new);
255 Inkscape::GC::release(repr);
256 return gr_new;
257 }
258 return gr;
259 }
261 /**
262 * Obtain the vector from the gradient. A forked vector will be created and linked to this gradient if another gradient uses it.
263 */
264 SPGradient *
265 sp_gradient_get_forked_vector_if_necessary(SPGradient *gradient, bool force_vector)
266 {
267 SPGradient *vector = sp_gradient_get_vector (gradient, force_vector);
268 vector = sp_gradient_fork_vector_if_necessary (vector);
269 if ( gradient != vector && gradient->ref->getObject() != vector ) {
270 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
271 }
272 return vector;
273 }
276 /**
277 * Convert an item's gradient to userspace _without_ preserving coords, setting them to defaults
278 * instead. No forking or reapplying is done because this is only called for newly created privates.
279 * @return The new gradient.
280 */
281 SPGradient *
282 sp_gradient_reset_to_userspace (SPGradient *gr, SPItem *item)
283 {
284 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
286 // calculate the bbox of the item
287 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
288 Geom::OptRect bbox = item->getBounds(Geom::identity()); // we need "true" bbox without item_i2d_affine
290 if (!bbox)
291 return gr;
293 Geom::Coord const width = bbox->dimensions()[Geom::X];
294 Geom::Coord const height = bbox->dimensions()[Geom::Y];
296 Geom::Point const center = bbox->midpoint();
298 if (SP_IS_RADIALGRADIENT(gr)) {
299 sp_repr_set_svg_double(repr, "cx", center[Geom::X]);
300 sp_repr_set_svg_double(repr, "cy", center[Geom::Y]);
301 sp_repr_set_svg_double(repr, "fx", center[Geom::X]);
302 sp_repr_set_svg_double(repr, "fy", center[Geom::Y]);
303 sp_repr_set_svg_double(repr, "r", width/2);
305 // we want it to be elliptic, not circular
306 Geom::Matrix squeeze = Geom::Translate (-center) *
307 Geom::Scale(1, height/width) *
308 Geom::Translate (center);
310 gr->gradientTransform = squeeze;
311 {
312 gchar *c=sp_svg_transform_write(gr->gradientTransform);
313 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
314 g_free(c);
315 }
316 } else {
317 sp_repr_set_svg_double(repr, "x1", (center - Geom::Point(width/2, 0))[Geom::X]);
318 sp_repr_set_svg_double(repr, "y1", (center - Geom::Point(width/2, 0))[Geom::Y]);
319 sp_repr_set_svg_double(repr, "x2", (center + Geom::Point(width/2, 0))[Geom::X]);
320 sp_repr_set_svg_double(repr, "y2", (center + Geom::Point(width/2, 0))[Geom::Y]);
321 }
323 // set the gradientUnits
324 repr->setAttribute("gradientUnits", "userSpaceOnUse");
326 return gr;
327 }
329 /**
330 * Convert an item's gradient to userspace if necessary, also fork it if necessary.
331 * @return The new gradient.
332 */
333 SPGradient *
334 sp_gradient_convert_to_userspace(SPGradient *gr, SPItem *item, gchar const *property)
335 {
336 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
338 // First, fork it if it is shared
339 gr = sp_gradient_fork_private_if_necessary(gr, sp_gradient_get_vector(gr, FALSE),
340 SP_IS_RADIALGRADIENT(gr) ? SP_GRADIENT_TYPE_RADIAL : SP_GRADIENT_TYPE_LINEAR, SP_OBJECT(item));
342 if (gr->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
344 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gr);
346 // calculate the bbox of the item
347 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
348 Geom::Matrix bbox2user;
349 Geom::OptRect bbox = item->getBounds(Geom::identity()); // we need "true" bbox without item_i2d_affine
350 if ( bbox ) {
351 bbox2user = Geom::Matrix(bbox->dimensions()[Geom::X], 0,
352 0, bbox->dimensions()[Geom::Y],
353 bbox->min()[Geom::X], bbox->min()[Geom::Y]);
354 } else {
355 // would be degenerate otherwise
356 bbox2user = Geom::identity();
357 }
359 /* skew is the additional transform, defined by the proportions of the item, that we need
360 * to apply to the gradient in order to work around this weird bit from SVG 1.1
361 * (http://www.w3.org/TR/SVG11/pservers.html#LinearGradients):
362 *
363 * When gradientUnits="objectBoundingBox" and gradientTransform is the identity
364 * matrix, the stripes of the linear gradient are perpendicular to the gradient
365 * vector in object bounding box space (i.e., the abstract coordinate system where
366 * (0,0) is at the top/left of the object bounding box and (1,1) is at the
367 * bottom/right of the object bounding box). When the object's bounding box is not
368 * square, the stripes that are conceptually perpendicular to the gradient vector
369 * within object bounding box space will render non-perpendicular relative to the
370 * gradient vector in user space due to application of the non-uniform scaling
371 * transformation from bounding box space to user space.
372 */
373 Geom::Matrix skew = bbox2user;
374 double exp = skew.descrim();
375 skew[0] /= exp;
376 skew[1] /= exp;
377 skew[2] /= exp;
378 skew[3] /= exp;
379 skew[4] = 0;
380 skew[5] = 0;
382 // apply skew to the gradient
383 gr->gradientTransform = skew;
384 {
385 gchar *c=sp_svg_transform_write(gr->gradientTransform);
386 SP_OBJECT_REPR(gr)->setAttribute("gradientTransform", c);
387 g_free(c);
388 }
390 // Matrix to convert points to userspace coords; postmultiply by inverse of skew so
391 // as to cancel it out when it's applied to the gradient during rendering
392 Geom::Matrix point_convert = bbox2user * skew.inverse();
394 if (SP_IS_RADIALGRADIENT(gr)) {
395 SPRadialGradient *rg = SP_RADIALGRADIENT(gr);
397 // original points in the bbox coords
398 Geom::Point c_b = Geom::Point(rg->cx.computed, rg->cy.computed);
399 Geom::Point f_b = Geom::Point(rg->fx.computed, rg->fy.computed);
400 double r_b = rg->r.computed;
402 // converted points in userspace coords
403 Geom::Point c_u = c_b * point_convert;
404 Geom::Point f_u = f_b * point_convert;
405 double r_u = r_b * point_convert.descrim();
407 sp_repr_set_svg_double(repr, "cx", c_u[Geom::X]);
408 sp_repr_set_svg_double(repr, "cy", c_u[Geom::Y]);
409 sp_repr_set_svg_double(repr, "fx", f_u[Geom::X]);
410 sp_repr_set_svg_double(repr, "fy", f_u[Geom::Y]);
411 sp_repr_set_svg_double(repr, "r", r_u);
413 } else {
414 SPLinearGradient *lg = SP_LINEARGRADIENT(gr);
416 Geom::Point p1_b = Geom::Point(lg->x1.computed, lg->y1.computed);
417 Geom::Point p2_b = Geom::Point(lg->x2.computed, lg->y2.computed);
419 Geom::Point p1_u = p1_b * point_convert;
420 Geom::Point p2_u = p2_b * point_convert;
422 sp_repr_set_svg_double(repr, "x1", p1_u[Geom::X]);
423 sp_repr_set_svg_double(repr, "y1", p1_u[Geom::Y]);
424 sp_repr_set_svg_double(repr, "x2", p2_u[Geom::X]);
425 sp_repr_set_svg_double(repr, "y2", p2_u[Geom::Y]);
426 }
428 // set the gradientUnits
429 repr->setAttribute("gradientUnits", "userSpaceOnUse");
430 }
432 // apply the gradient to the item (may be necessary if we forked it); not recursive
433 // generally because grouped items will be taken care of later (we're being called
434 // from sp_item_adjust_paint_recursive); however text and all its children should all
435 // refer to one gradient, hence the recursive call for text (because we can't/don't
436 // want to access tspans and set gradients on them separately)
437 if (SP_IS_TEXT(item))
438 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), true);
439 else
440 sp_style_set_property_url(SP_OBJECT(item), property, SP_OBJECT(gr), false);
442 return gr;
443 }
445 void
446 sp_gradient_transform_multiply(SPGradient *gradient, Geom::Matrix postmul, bool set)
447 {
448 if (set) {
449 gradient->gradientTransform = postmul;
450 } else {
451 gradient->gradientTransform *= postmul; // fixme: get gradient transform by climbing to hrefs?
452 }
453 gradient->gradientTransform_set = TRUE;
455 gchar *c=sp_svg_transform_write(gradient->gradientTransform);
456 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", c);
457 g_free(c);
458 }
460 SPGradient *
461 sp_item_gradient (SPItem *item, bool fill_or_stroke)
462 {
463 SPStyle *style = SP_OBJECT_STYLE (item);
464 SPGradient *gradient = NULL;
466 if (fill_or_stroke) {
467 if (style && (style->fill.isPaintserver())) {
468 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER(item);
469 if (SP_IS_GRADIENT (server)) {
470 gradient = SP_GRADIENT (server);
471 }
472 }
473 } else {
474 if (style && (style->stroke.isPaintserver())) {
475 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER(item);
476 if (SP_IS_GRADIENT (server)) {
477 gradient = SP_GRADIENT (server);
478 }
479 }
480 }
482 return gradient;
483 }
485 SPStop*
486 sp_prev_stop(SPStop *stop, SPGradient *gradient)
487 {
488 if (sp_object_first_child(SP_OBJECT(gradient)) == SP_OBJECT(stop)) {
489 return NULL;
490 }
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 = gradient->getFirstStop(); stop != NULL; stop = sp_next_stop (stop)) {
517 if (sp_next_stop (stop) == NULL)
518 return stop;
519 }
520 return NULL;
521 }
523 SPStop*
524 sp_get_stop_i(SPGradient *gradient, guint stop_i)
525 {
526 SPStop *stop = gradient->getFirstStop();
528 // if this is valid but weird gradient without an offset-zero stop element,
529 // inkscape has created a handle for the start of gradient anyway,
530 // so when it asks for stop N that corresponds to stop element N-1
531 if (stop->offset != 0)
532 stop_i --;
534 for (guint i=0; i < stop_i; i++) {
535 if (!stop) return NULL;
536 stop = sp_next_stop (stop);
537 }
539 return stop;
540 }
542 guint32
543 average_color (guint32 c1, guint32 c2, gdouble p)
544 {
545 guint32 r = (guint32) (SP_RGBA32_R_U (c1) * (1 - p) + SP_RGBA32_R_U (c2) * p);
546 guint32 g = (guint32) (SP_RGBA32_G_U (c1) * (1 - p) + SP_RGBA32_G_U (c2) * p);
547 guint32 b = (guint32) (SP_RGBA32_B_U (c1) * (1 - p) + SP_RGBA32_B_U (c2) * p);
548 guint32 a = (guint32) (SP_RGBA32_A_U (c1) * (1 - p) + SP_RGBA32_A_U (c2) * p);
550 return SP_RGBA32_U_COMPOSE (r, g, b, a);
551 }
553 SPStop *
554 sp_vector_add_stop (SPGradient *vector, SPStop* prev_stop, SPStop* next_stop, gfloat offset)
555 {
556 Inkscape::XML::Node *new_stop_repr = NULL;
557 new_stop_repr = SP_OBJECT_REPR(prev_stop)->duplicate(SP_OBJECT_REPR(vector)->document());
558 SP_OBJECT_REPR(vector)->addChild(new_stop_repr, SP_OBJECT_REPR(prev_stop));
560 SPStop *newstop = (SPStop *) SP_OBJECT_DOCUMENT(vector)->getObjectByRepr(new_stop_repr);
561 newstop->offset = offset;
562 sp_repr_set_css_double( SP_OBJECT_REPR(newstop), "offset", (double)offset);
563 guint32 const c1 = sp_stop_get_rgba32(prev_stop);
564 guint32 const c2 = sp_stop_get_rgba32(next_stop);
565 guint32 cnew = average_color (c1, c2, (offset - prev_stop->offset) / (next_stop->offset - prev_stop->offset));
566 Inkscape::CSSOStringStream os;
567 gchar c[64];
568 sp_svg_write_color (c, sizeof(c), cnew);
569 gdouble opacity = (gdouble) SP_RGBA32_A_F (cnew);
570 os << "stop-color:" << c << ";stop-opacity:" << opacity <<";";
571 SP_OBJECT_REPR (newstop)->setAttribute("style", os.str().c_str());
572 Inkscape::GC::release(new_stop_repr);
574 return newstop;
575 }
577 void
578 sp_item_gradient_edit_stop (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
579 {
580 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
582 if (!gradient || !SP_IS_GRADIENT(gradient))
583 return;
585 SPGradient *vector = sp_gradient_get_vector (gradient, false);
586 switch (point_type) {
587 case POINT_LG_BEGIN:
588 case POINT_RG_CENTER:
589 case POINT_RG_FOCUS:
590 {
591 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, vector->getFirstStop());
592 gtk_widget_show (dialog);
593 }
594 break;
596 case POINT_LG_END:
597 case POINT_RG_R1:
598 case POINT_RG_R2:
599 {
600 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_last_stop (vector));
601 gtk_widget_show (dialog);
602 }
603 break;
605 case POINT_LG_MID:
606 case POINT_RG_MID1:
607 case POINT_RG_MID2:
608 {
609 GtkWidget *dialog = sp_gradient_vector_editor_new (vector, sp_get_stop_i (vector, point_i));
610 gtk_widget_show (dialog);
611 }
612 break;
613 default:
614 break;
615 }
616 }
618 guint32
619 sp_item_gradient_stop_query_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
620 {
621 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
623 if (!gradient || !SP_IS_GRADIENT(gradient))
624 return 0;
626 SPGradient *vector = sp_gradient_get_vector (gradient, false);
628 if (!vector) // orphan!
629 return 0; // what else to do?
631 switch (point_type) {
632 case POINT_LG_BEGIN:
633 case POINT_RG_CENTER:
634 case POINT_RG_FOCUS:
635 {
636 SPStop *first = vector->getFirstStop();
637 if (first) {
638 return sp_stop_get_rgba32(first);
639 }
640 }
641 break;
643 case POINT_LG_END:
644 case POINT_RG_R1:
645 case POINT_RG_R2:
646 {
647 SPStop *last = sp_last_stop (vector);
648 if (last) {
649 return sp_stop_get_rgba32(last);
650 }
651 }
652 break;
654 case POINT_LG_MID:
655 case POINT_RG_MID1:
656 case POINT_RG_MID2:
657 {
658 SPStop *stopi = sp_get_stop_i (vector, point_i);
659 if (stopi) {
660 return sp_stop_get_rgba32(stopi);
661 }
662 }
663 break;
665 default:
666 break;
667 }
668 return 0;
669 }
671 void
672 sp_item_gradient_stop_set_style (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, SPCSSAttr *stop)
673 {
674 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
676 if (!gradient || !SP_IS_GRADIENT(gradient))
677 return;
679 SPGradient *vector = sp_gradient_get_vector (gradient, false);
681 if (!vector) // orphan!
682 return;
684 vector = sp_gradient_fork_vector_if_necessary (vector);
685 if ( gradient != vector && gradient->ref->getObject() != vector ) {
686 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
687 }
689 switch (point_type) {
690 case POINT_LG_BEGIN:
691 case POINT_RG_CENTER:
692 case POINT_RG_FOCUS:
693 {
694 SPStop *first = vector->getFirstStop();
695 if (first) {
696 sp_repr_css_change (SP_OBJECT_REPR (first), stop, "style");
697 }
698 }
699 break;
701 case POINT_LG_END:
702 case POINT_RG_R1:
703 case POINT_RG_R2:
704 {
705 SPStop *last = sp_last_stop (vector);
706 if (last) {
707 sp_repr_css_change (SP_OBJECT_REPR (last), stop, "style");
708 }
709 }
710 break;
712 case POINT_LG_MID:
713 case POINT_RG_MID1:
714 case POINT_RG_MID2:
715 {
716 SPStop *stopi = sp_get_stop_i (vector, point_i);
717 if (stopi) {
718 sp_repr_css_change (SP_OBJECT_REPR (stopi), stop, "style");
719 }
720 }
721 break;
723 default:
724 break;
725 }
726 }
728 void
729 sp_item_gradient_reverse_vector (SPItem *item, bool fill_or_stroke)
730 {
731 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
732 if (!gradient || !SP_IS_GRADIENT(gradient))
733 return;
735 SPGradient *vector = sp_gradient_get_vector (gradient, false);
736 if (!vector) // orphan!
737 return;
739 vector = sp_gradient_fork_vector_if_necessary (vector);
740 if ( gradient != vector && gradient->ref->getObject() != vector ) {
741 sp_gradient_repr_set_link(SP_OBJECT_REPR(gradient), vector);
742 }
744 GSList *child_reprs = NULL;
745 GSList *child_objects = NULL;
746 std::vector<double> offsets;
747 for (SPObject *child = sp_object_first_child(vector);
748 child != NULL; child = SP_OBJECT_NEXT(child)) {
749 child_reprs = g_slist_prepend (child_reprs, SP_OBJECT_REPR(child));
750 child_objects = g_slist_prepend (child_objects, child);
751 offsets.push_back(sp_repr_get_double_attribute(SP_OBJECT_REPR(child), "offset", 0));
752 }
754 GSList *child_copies = NULL;
755 for (GSList *i = child_reprs; i != NULL; i = i->next) {
756 Inkscape::XML::Node *repr = (Inkscape::XML::Node *) i->data;
757 Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(vector)->document();
758 child_copies = g_slist_append (child_copies, repr->duplicate(xml_doc));
759 }
762 for (GSList *i = child_objects; i != NULL; i = i->next) {
763 SPObject *child = SP_OBJECT (i->data);
764 child->deleteObject();
765 }
767 std::vector<double>::iterator iter = offsets.end() - 1;
768 for (GSList *i = child_copies; i != NULL; i = i->next) {
769 Inkscape::XML::Node *copy = (Inkscape::XML::Node *) i->data;
770 vector->appendChildRepr(copy);
771 sp_repr_set_svg_double (copy, "offset", 1 - *iter);
772 iter --;
773 Inkscape::GC::release(copy);
774 }
776 g_slist_free (child_reprs);
777 g_slist_free (child_copies);
778 g_slist_free (child_objects);
779 }
782 /**
783 Set the position of point point_type of the gradient applied to item (either fill_or_stroke) to
784 p_w (in desktop coordinates). Write_repr if you want the change to become permanent.
785 */
786 void
787 sp_item_gradient_set_coords (SPItem *item, guint point_type, guint point_i, Geom::Point p_w, bool fill_or_stroke, bool write_repr, bool scale)
788 {
789 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
791 if (!gradient || !SP_IS_GRADIENT(gradient))
792 return;
794 gradient = sp_gradient_convert_to_userspace (gradient, item, fill_or_stroke? "fill" : "stroke");
796 Geom::Matrix i2d (sp_item_i2d_affine (item));
797 Geom::Point p = p_w * i2d.inverse();
798 p *= (gradient->gradientTransform).inverse();
799 // now p is in gradient's original coordinates
801 Inkscape::XML::Node *repr = SP_OBJECT_REPR(gradient);
803 if (SP_IS_LINEARGRADIENT(gradient)) {
804 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
805 switch (point_type) {
806 case POINT_LG_BEGIN:
807 if (scale) {
808 lg->x2.computed += (lg->x1.computed - p[Geom::X]);
809 lg->y2.computed += (lg->y1.computed - p[Geom::Y]);
810 }
811 lg->x1.computed = p[Geom::X];
812 lg->y1.computed = p[Geom::Y];
813 if (write_repr) {
814 if (scale) {
815 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
816 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
817 }
818 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
819 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
820 } else {
821 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
822 }
823 break;
824 case POINT_LG_END:
825 if (scale) {
826 lg->x1.computed += (lg->x2.computed - p[Geom::X]);
827 lg->y1.computed += (lg->y2.computed - p[Geom::Y]);
828 }
829 lg->x2.computed = p[Geom::X];
830 lg->y2.computed = p[Geom::Y];
831 if (write_repr) {
832 if (scale) {
833 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
834 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
835 }
836 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
837 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
838 } else {
839 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
840 }
841 break;
842 case POINT_LG_MID:
843 {
844 // using X-coordinates only to determine the offset, assuming p has been snapped to the vector from begin to end.
845 double offset = get_offset_between_points (p, Geom::Point(lg->x1.computed, lg->y1.computed), Geom::Point(lg->x2.computed, lg->y2.computed));
846 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (lg, false);
847 sp_gradient_ensure_vector(lg);
848 lg->vector.stops.at(point_i).offset = offset;
849 SPStop* stopi = sp_get_stop_i(vector, point_i);
850 stopi->offset = offset;
851 if (write_repr) {
852 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
853 } else {
854 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
855 }
856 }
857 break;
858 default:
859 break;
860 }
861 } else if (SP_IS_RADIALGRADIENT(gradient)) {
862 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
863 Geom::Point c (rg->cx.computed, rg->cy.computed);
864 Geom::Point c_w = c * gradient->gradientTransform * i2d; // now in desktop coords
865 if ((point_type == POINT_RG_R1 || point_type == POINT_RG_R2) && Geom::L2 (p_w - c_w) < 1e-3) {
866 // prevent setting a radius too close to the center
867 return;
868 }
869 Geom::Matrix new_transform;
870 bool transform_set = false;
872 switch (point_type) {
873 case POINT_RG_CENTER:
874 rg->fx.computed = p[Geom::X] + (rg->fx.computed - rg->cx.computed);
875 rg->fy.computed = p[Geom::Y] + (rg->fy.computed - rg->cy.computed);
876 rg->cx.computed = p[Geom::X];
877 rg->cy.computed = p[Geom::Y];
878 if (write_repr) {
879 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
880 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
881 sp_repr_set_svg_double(repr, "cx", rg->cx.computed);
882 sp_repr_set_svg_double(repr, "cy", rg->cy.computed);
883 } else {
884 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
885 }
886 break;
887 case POINT_RG_FOCUS:
888 rg->fx.computed = p[Geom::X];
889 rg->fy.computed = p[Geom::Y];
890 if (write_repr) {
891 sp_repr_set_svg_double(repr, "fx", rg->fx.computed);
892 sp_repr_set_svg_double(repr, "fy", rg->fy.computed);
893 } else {
894 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
895 }
896 break;
897 case POINT_RG_R1:
898 {
899 Geom::Point r1_w = (c + Geom::Point(rg->r.computed, 0)) * gradient->gradientTransform * i2d;
900 double r1_angle = Geom::atan2(r1_w - c_w);
901 double move_angle = Geom::atan2(p_w - c_w) - r1_angle;
902 double move_stretch = Geom::L2(p_w - c_w) / Geom::L2(r1_w - c_w);
904 Geom::Matrix move = Geom::Matrix (Geom::Translate (-c_w)) *
905 Geom::Matrix (Geom::Rotate(-r1_angle)) *
906 Geom::Matrix (Geom::Scale(move_stretch, scale? move_stretch : 1)) *
907 Geom::Matrix (Geom::Rotate(r1_angle)) *
908 Geom::Matrix (Geom::Rotate(move_angle)) *
909 Geom::Matrix (Geom::Translate (c_w));
911 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
912 transform_set = true;
914 break;
915 }
916 case POINT_RG_R2:
917 {
918 Geom::Point r2_w = (c + Geom::Point(0, -rg->r.computed)) * gradient->gradientTransform * i2d;
919 double r2_angle = Geom::atan2(r2_w - c_w);
920 double move_angle = Geom::atan2(p_w - c_w) - r2_angle;
921 double move_stretch = Geom::L2(p_w - c_w) / Geom::L2(r2_w - c_w);
923 Geom::Matrix move = Geom::Matrix (Geom::Translate (-c_w)) *
924 Geom::Matrix (Geom::Rotate(-r2_angle)) *
925 Geom::Matrix (Geom::Scale(move_stretch, scale? move_stretch : 1)) *
926 Geom::Matrix (Geom::Rotate(r2_angle)) *
927 Geom::Matrix (Geom::Rotate(move_angle)) *
928 Geom::Matrix (Geom::Translate (c_w));
930 new_transform = gradient->gradientTransform * i2d * move * i2d.inverse();
931 transform_set = true;
933 break;
934 }
935 case POINT_RG_MID1:
936 {
937 Geom::Point start = Geom::Point (rg->cx.computed, rg->cy.computed);
938 Geom::Point end = Geom::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
939 double offset = get_offset_between_points (p, start, end);
940 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (rg, false);
941 sp_gradient_ensure_vector(rg);
942 rg->vector.stops.at(point_i).offset = offset;
943 SPStop* stopi = sp_get_stop_i(vector, point_i);
944 stopi->offset = offset;
945 if (write_repr) {
946 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
947 } else {
948 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
949 }
950 break;
951 }
952 case POINT_RG_MID2:
953 Geom::Point start = Geom::Point (rg->cx.computed, rg->cy.computed);
954 Geom::Point end = Geom::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
955 double offset = get_offset_between_points (p, start, end);
956 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary(rg, false);
957 sp_gradient_ensure_vector(rg);
958 rg->vector.stops.at(point_i).offset = offset;
959 SPStop* stopi = sp_get_stop_i(vector, point_i);
960 stopi->offset = offset;
961 if (write_repr) {
962 sp_repr_set_css_double(SP_OBJECT_REPR(stopi), "offset", stopi->offset);
963 } else {
964 SP_OBJECT (stopi)->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
965 }
966 break;
967 }
969 if (transform_set) {
970 gradient->gradientTransform = new_transform;
971 gradient->gradientTransform_set = TRUE;
972 if (write_repr) {
973 gchar *s=sp_svg_transform_write(gradient->gradientTransform);
974 SP_OBJECT_REPR(gradient)->setAttribute("gradientTransform", s);
975 g_free(s);
976 } else {
977 SP_OBJECT (gradient)->requestModified(SP_OBJECT_MODIFIED_FLAG);
978 }
979 }
980 }
981 }
983 SPGradient *
984 sp_item_gradient_get_vector (SPItem *item, bool fill_or_stroke)
985 {
986 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
988 if (gradient)
989 return sp_gradient_get_vector (gradient, false);
990 return NULL;
991 }
993 SPGradientSpread
994 sp_item_gradient_get_spread (SPItem *item, bool fill_or_stroke)
995 {
996 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
998 if (gradient)
999 return sp_gradient_get_spread (gradient);
1000 return SP_GRADIENT_SPREAD_PAD;
1001 }
1004 /**
1005 Returns the position of point point_type of the gradient applied to item (either fill_or_stroke),
1006 in desktop coordinates.
1007 */
1009 Geom::Point
1010 sp_item_gradient_get_coords (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
1011 {
1012 SPGradient *gradient = sp_item_gradient (item, fill_or_stroke);
1014 Geom::Point p (0, 0);
1016 if (!gradient)
1017 return from_2geom(p);
1019 if (SP_IS_LINEARGRADIENT(gradient)) {
1020 SPLinearGradient *lg = SP_LINEARGRADIENT(gradient);
1021 switch (point_type) {
1022 case POINT_LG_BEGIN:
1023 p = Geom::Point (lg->x1.computed, lg->y1.computed);
1024 break;
1025 case POINT_LG_END:
1026 p = Geom::Point (lg->x2.computed, lg->y2.computed);
1027 break;
1028 case POINT_LG_MID:
1029 {
1030 gdouble offset = lg->vector.stops.at(point_i).offset;
1031 p = (1-offset) * Geom::Point(lg->x1.computed, lg->y1.computed) + offset * Geom::Point(lg->x2.computed, lg->y2.computed);
1032 }
1033 break;
1034 }
1035 } else if (SP_IS_RADIALGRADIENT(gradient)) {
1036 SPRadialGradient *rg = SP_RADIALGRADIENT(gradient);
1037 switch (point_type) {
1038 case POINT_RG_CENTER:
1039 p = Geom::Point (rg->cx.computed, rg->cy.computed);
1040 break;
1041 case POINT_RG_FOCUS:
1042 p = Geom::Point (rg->fx.computed, rg->fy.computed);
1043 break;
1044 case POINT_RG_R1:
1045 p = Geom::Point (rg->cx.computed + rg->r.computed, rg->cy.computed);
1046 break;
1047 case POINT_RG_R2:
1048 p = Geom::Point (rg->cx.computed, rg->cy.computed - rg->r.computed);
1049 break;
1050 case POINT_RG_MID1:
1051 {
1052 gdouble offset = rg->vector.stops.at(point_i).offset;
1053 p = (1-offset) * Geom::Point (rg->cx.computed, rg->cy.computed) + offset * Geom::Point(rg->cx.computed + rg->r.computed, rg->cy.computed);
1054 }
1055 break;
1056 case POINT_RG_MID2:
1057 {
1058 gdouble offset = rg->vector.stops.at(point_i).offset;
1059 p = (1-offset) * Geom::Point (rg->cx.computed, rg->cy.computed) + offset * Geom::Point(rg->cx.computed, rg->cy.computed - rg->r.computed);
1060 }
1061 break;
1062 }
1063 }
1065 if (SP_GRADIENT(gradient)->units == SP_GRADIENT_UNITS_OBJECTBOUNDINGBOX) {
1066 sp_document_ensure_up_to_date(SP_OBJECT_DOCUMENT(item));
1067 Geom::OptRect bbox = item->getBounds(Geom::identity()); // we need "true" bbox without item_i2d_affine
1068 if (bbox) {
1069 p *= Geom::Matrix(bbox->dimensions()[Geom::X], 0,
1070 0, bbox->dimensions()[Geom::Y],
1071 bbox->min()[Geom::X], bbox->min()[Geom::Y]);
1072 }
1073 }
1074 p *= Geom::Matrix(gradient->gradientTransform) * (Geom::Matrix)sp_item_i2d_affine(item);
1075 return from_2geom(p);
1076 }
1079 /**
1080 * Sets item fill or stroke to the gradient of the specified type with given vector, creating
1081 * new private gradient, if needed.
1082 * gr has to be a normalized vector.
1083 */
1085 SPGradient *
1086 sp_item_set_gradient(SPItem *item, SPGradient *gr, SPGradientType type, bool is_fill)
1087 {
1088 g_return_val_if_fail(item != NULL, NULL);
1089 g_return_val_if_fail(SP_IS_ITEM(item), NULL);
1090 g_return_val_if_fail(gr != NULL, NULL);
1091 g_return_val_if_fail(SP_IS_GRADIENT(gr), NULL);
1092 g_return_val_if_fail(gr->state == SP_GRADIENT_STATE_VECTOR, NULL);
1094 SPStyle *style = SP_OBJECT_STYLE(item);
1095 g_assert(style != NULL);
1097 SPPaintServer *ps = NULL;
1098 if (is_fill? style->fill.isPaintserver() : style->stroke.isPaintserver())
1099 ps = is_fill? SP_STYLE_FILL_SERVER(style) : SP_STYLE_STROKE_SERVER(style);
1101 if (ps
1102 && ( (type == SP_GRADIENT_TYPE_LINEAR && SP_IS_LINEARGRADIENT(ps)) ||
1103 (type == SP_GRADIENT_TYPE_RADIAL && SP_IS_RADIALGRADIENT(ps)) ) )
1104 {
1106 /* Current fill style is the gradient of the required type */
1107 SPGradient *current = SP_GRADIENT(ps);
1109 //g_print("hrefcount %d count %d\n", SP_OBJECT_HREFCOUNT(ig), count_gradient_hrefs(SP_OBJECT(item), ig));
1111 if (SP_OBJECT_HREFCOUNT(current) == 1 ||
1112 SP_OBJECT_HREFCOUNT(current) == count_gradient_hrefs(SP_OBJECT(item), current)) {
1114 // current is private and it's either used once, or all its uses are by children of item;
1115 // so just change its href to vector
1117 if ( current != gr && sp_gradient_get_vector(current, false) != gr ) {
1118 /* href is not the vector */
1119 sp_gradient_repr_set_link(SP_OBJECT_REPR(current), gr);
1120 }
1121 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1122 return current;
1124 } else {
1126 // the gradient is not private, or it is shared with someone else;
1127 // normalize it (this includes creating new private if necessary)
1128 SPGradient *normalized = sp_gradient_fork_private_if_necessary(current, gr, type, item);
1130 g_return_val_if_fail(normalized != NULL, NULL);
1132 if (normalized != current) {
1134 /* We have to change object style here; recursive because this is used from
1135 * fill&stroke and must work for groups etc. */
1136 sp_style_set_property_url(SP_OBJECT(item), is_fill? "fill" : "stroke", SP_OBJECT(normalized), true);
1137 }
1138 SP_OBJECT(item)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1139 return normalized;
1140 }
1142 } else {
1143 /* Current fill style is not a gradient or wrong type, so construct everything */
1144 SPGradient *constructed = sp_gradient_get_private_normalized(SP_OBJECT_DOCUMENT(item), gr, type);
1145 constructed = sp_gradient_reset_to_userspace(constructed, item);
1146 sp_style_set_property_url(SP_OBJECT(item), ( is_fill ? "fill" : "stroke" ), SP_OBJECT(constructed), true);
1147 SP_OBJECT(item)->requestDisplayUpdate(( SP_OBJECT_MODIFIED_FLAG |
1148 SP_OBJECT_STYLE_MODIFIED_FLAG ));
1149 return constructed;
1150 }
1151 }
1153 static void
1154 sp_gradient_repr_set_link(Inkscape::XML::Node *repr, SPGradient *link)
1155 {
1156 g_return_if_fail(repr != NULL);
1157 g_return_if_fail(link != NULL);
1158 g_return_if_fail(SP_IS_GRADIENT(link));
1160 gchar *ref;
1161 if (link) {
1162 gchar const *id = link->getId();
1163 size_t const len = strlen(id);
1164 ref = (gchar*) alloca(len + 2);
1165 *ref = '#';
1166 memcpy(ref + 1, id, len + 1);
1167 } else {
1168 ref = NULL;
1169 }
1171 repr->setAttribute("xlink:href", ref);
1172 }
1174 /*
1175 * Get default normalized gradient vector of document, create if there is none
1176 */
1178 SPGradient *
1179 sp_document_default_gradient_vector(SPDocument *document, guint32 color)
1180 {
1181 SPDefs *defs = (SPDefs *) SP_DOCUMENT_DEFS(document);
1182 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(document);
1184 Inkscape::XML::Node *repr = xml_doc->createElement("svg:linearGradient");
1186 repr->setAttribute("inkscape:collect", "always");
1187 // set here, but removed when it's edited in the gradient editor
1188 // to further reduce clutter, we could
1189 // (1) here, search gradients by color and return what is found without duplication
1190 // (2) in fill & stroke, show only one copy of each gradient in list
1192 Inkscape::XML::Node *stop = xml_doc->createElement("svg:stop");
1194 gchar b[64];
1195 sp_svg_write_color(b, sizeof(b), color);
1197 {
1198 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:1;", b);
1199 stop->setAttribute("style", t);
1200 g_free(t);
1201 }
1203 stop->setAttribute("offset", "0");
1205 repr->appendChild(stop);
1206 Inkscape::GC::release(stop);
1208 stop = xml_doc->createElement("svg:stop");
1210 {
1211 gchar *t = g_strdup_printf("stop-color:%s;stop-opacity:0;", b);
1212 stop->setAttribute("style", t);
1213 g_free(t);
1214 }
1216 stop->setAttribute("offset", "1");
1218 repr->appendChild(stop);
1219 Inkscape::GC::release(stop);
1221 SP_OBJECT_REPR(defs)->addChild(repr, NULL);
1222 Inkscape::GC::release(repr);
1224 /* fixme: This does not look like nice */
1225 SPGradient *gr;
1226 gr = (SPGradient *) document->getObjectByRepr(repr);
1227 g_assert(gr != NULL);
1228 g_assert(SP_IS_GRADIENT(gr));
1229 /* fixme: Maybe add extra sanity check here */
1230 gr->state = SP_GRADIENT_STATE_VECTOR;
1232 return gr;
1233 }
1235 /**
1236 Return the preferred vector for \a o, made from (in order of preference) its current vector,
1237 current fill or stroke color, or from desktop style if \a o is NULL or doesn't have style.
1238 */
1239 SPGradient *
1240 sp_gradient_vector_for_object(SPDocument *const doc, SPDesktop *const desktop,
1241 SPObject *const o, bool const is_fill)
1242 {
1243 guint32 rgba = 0;
1244 if (o == NULL || SP_OBJECT_STYLE(o) == NULL) {
1245 rgba = sp_desktop_get_color(desktop, is_fill);
1246 } else {
1247 // take the color of the object
1248 SPStyle const &style = *SP_OBJECT_STYLE(o);
1249 SPIPaint const &paint = ( is_fill
1250 ? style.fill
1251 : style.stroke );
1252 if (paint.isPaintserver()) {
1253 SPObject *server = is_fill? SP_OBJECT_STYLE_FILL_SERVER(o) : SP_OBJECT_STYLE_STROKE_SERVER(o);
1254 if (SP_IS_GRADIENT (server)) {
1255 return sp_gradient_get_vector(SP_GRADIENT (server), TRUE);
1256 } else {
1257 rgba = sp_desktop_get_color(desktop, is_fill);
1258 }
1259 } else if (paint.isColor()) {
1260 rgba = paint.value.color.toRGBA32( 0xff );
1261 } else {
1262 // if o doesn't use flat color, then take current color of the desktop.
1263 rgba = sp_desktop_get_color(desktop, is_fill);
1264 }
1265 }
1267 return sp_document_default_gradient_vector(doc, rgba);
1268 }
1271 /*
1272 Local Variables:
1273 mode:c++
1274 c-file-style:"stroustrup"
1275 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1276 indent-tabs-mode:nil
1277 fill-column:99
1278 End:
1279 */
1280 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :