a40b9047ff4889f473e9dbefe75f09ce16ad6abb
1 #define __GRADIENT_DRAG_C__
3 /*
4 * On-canvas gradient dragging
5 *
6 * Authors:
7 * bulia byak <buliabyak@users.sf.net>
8 * Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
9 *
10 * Copyright (C) 2007 Johan Engelen
11 * Copyright (C) 2005 Authors
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 #ifdef HAVE_CONFIG_H
17 #include "config.h"
18 #endif
20 #include <glibmm/i18n.h>
22 #include "desktop-handles.h"
23 #include "selection.h"
24 #include "desktop.h"
25 #include "desktop-style.h"
26 #include "document.h"
27 #include "display/sp-ctrlline.h"
29 #include "xml/repr.h"
30 #include "svg/css-ostringstream.h"
32 #include "svg/svg.h"
33 #include "libnr/nr-point-fns.h"
35 #include "prefs-utils.h"
36 #include "sp-item.h"
37 #include "style.h"
38 #include "knot.h"
39 #include "sp-linear-gradient.h"
40 #include "sp-radial-gradient.h"
41 #include "gradient-chemistry.h"
42 #include "gradient-drag.h"
43 #include "sp-stop.h"
45 #include "snap.h"
46 #include "sp-namedview.h"
49 #define GR_KNOT_COLOR_NORMAL 0xffffff00
50 #define GR_KNOT_COLOR_MOUSEOVER 0xff000000
51 #define GR_KNOT_COLOR_SELECTED 0x0000ff00
53 #define GR_LINE_COLOR_FILL 0x0000ff7f
54 #define GR_LINE_COLOR_STROKE 0x9999007f
56 // screen pixels between knots when they snap:
57 #define SNAP_DIST 5
59 // absolute distance between gradient points for them to become a single dragger when the drag is created:
60 #define MERGE_DIST 0.1
62 // knot shapes corresponding to GrPointType enum
63 SPKnotShapeType gr_knot_shapes [] = {
64 SP_KNOT_SHAPE_SQUARE, //POINT_LG_BEGIN
65 SP_KNOT_SHAPE_CIRCLE, //POINT_LG_END
66 SP_KNOT_SHAPE_DIAMOND, //POINT_LG_MID
67 SP_KNOT_SHAPE_SQUARE, // POINT_RG_CENTER
68 SP_KNOT_SHAPE_CIRCLE, // POINT_RG_R1
69 SP_KNOT_SHAPE_CIRCLE, // POINT_RG_R2
70 SP_KNOT_SHAPE_CROSS, // POINT_RG_FOCUS
71 SP_KNOT_SHAPE_DIAMOND, //POINT_RG_MID1
72 SP_KNOT_SHAPE_DIAMOND //POINT_RG_MID2
73 };
75 const gchar *gr_knot_descr [] = {
76 N_("Linear gradient <b>start</b>"), //POINT_LG_BEGIN
77 N_("Linear gradient <b>end</b>"),
78 N_("Linear gradient <b>mid stop</b>"),
79 N_("Radial gradient <b>center</b>"),
80 N_("Radial gradient <b>radius</b>"),
81 N_("Radial gradient <b>radius</b>"),
82 N_("Radial gradient <b>focus</b>"), // POINT_RG_FOCUS
83 N_("Radial gradient <b>mid stop</b>"),
84 N_("Radial gradient <b>mid stop</b>")
85 };
87 static void
88 gr_drag_sel_changed(Inkscape::Selection *selection, gpointer data)
89 {
90 GrDrag *drag = (GrDrag *) data;
91 drag->updateDraggers ();
92 drag->updateLines ();
93 drag->updateLevels ();
94 }
96 static void
97 gr_drag_sel_modified (Inkscape::Selection *selection, guint flags, gpointer data)
98 {
99 GrDrag *drag = (GrDrag *) data;
100 if (drag->local_change) {
101 drag->local_change = false;
102 } else {
103 drag->updateDraggers ();
104 }
105 drag->updateLines ();
106 drag->updateLevels ();
107 }
109 /**
110 When a _query_style_signal is received, check that \a property requests fill/stroke/opacity (otherwise
111 skip), and fill the \a style with the averaged color of all draggables of the selected dragger, if
112 any.
113 */
114 int
115 gr_drag_style_query (SPStyle *style, int property, gpointer data)
116 {
117 GrDrag *drag = (GrDrag *) data;
119 if (property != QUERY_STYLE_PROPERTY_FILL && property != QUERY_STYLE_PROPERTY_STROKE && property != QUERY_STYLE_PROPERTY_MASTEROPACITY) {
120 return QUERY_STYLE_NOTHING;
121 }
123 if (!drag->selected) {
124 return QUERY_STYLE_NOTHING;
125 } else {
126 int ret = QUERY_STYLE_NOTHING;
128 float cf[4];
129 cf[0] = cf[1] = cf[2] = cf[3] = 0;
131 int count = 0;
133 for (GList *i = drag->selected; i != NULL; i = i->next) { // for all selected draggers
134 GrDragger *d = (GrDragger *) i->data;
135 for (GSList const* j = d->draggables; j != NULL; j = j->next) { // for all draggables of dragger
136 GrDraggable *draggable = (GrDraggable *) j->data;
138 if (ret == QUERY_STYLE_NOTHING) {
139 ret = QUERY_STYLE_SINGLE;
140 } else if (ret == QUERY_STYLE_SINGLE) {
141 ret = QUERY_STYLE_MULTIPLE_AVERAGED;
142 }
144 guint32 c = sp_item_gradient_stop_query_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
145 cf[0] += SP_RGBA32_R_F (c);
146 cf[1] += SP_RGBA32_G_F (c);
147 cf[2] += SP_RGBA32_B_F (c);
148 cf[3] += SP_RGBA32_A_F (c);
150 count ++;
151 }
152 }
154 if (count) {
155 cf[0] /= count;
156 cf[1] /= count;
157 cf[2] /= count;
158 cf[3] /= count;
160 // set both fill and stroke with our stop-color and stop-opacity
161 style->fill.clear();
162 style->fill.setColor( cf[0], cf[1], cf[2] );
163 style->fill.set = TRUE;
164 style->stroke.clear();
165 style->stroke.setColor( cf[0], cf[1], cf[2] );
166 style->stroke.set = TRUE;
168 style->fill_opacity.value = SP_SCALE24_FROM_FLOAT (1.0);
169 style->fill_opacity.set = TRUE;
170 style->stroke_opacity.value = SP_SCALE24_FROM_FLOAT (1.0);
171 style->stroke_opacity.set = TRUE;
173 style->opacity.value = SP_SCALE24_FROM_FLOAT (cf[3]);
174 style->opacity.set = TRUE;
175 }
177 return ret;
178 }
179 }
181 bool
182 gr_drag_style_set (const SPCSSAttr *css, gpointer data)
183 {
184 GrDrag *drag = (GrDrag *) data;
186 if (!drag->selected)
187 return false;
189 SPCSSAttr *stop = sp_repr_css_attr_new ();
191 // See if the css contains interesting properties, and if so, translate them into the format
192 // acceptable for gradient stops
194 // any of color properties, in order of increasing priority:
195 if (css->attribute("flood-color"))
196 sp_repr_css_set_property (stop, "stop-color", css->attribute("flood-color"));
198 if (css->attribute("lighting-color"))
199 sp_repr_css_set_property (stop, "stop-color", css->attribute("lighting-color"));
201 if (css->attribute("color"))
202 sp_repr_css_set_property (stop, "stop-color", css->attribute("color"));
204 if (css->attribute("stroke") && strcmp(css->attribute("stroke"), "none"))
205 sp_repr_css_set_property (stop, "stop-color", css->attribute("stroke"));
207 if (css->attribute("fill") && strcmp(css->attribute("fill"), "none"))
208 sp_repr_css_set_property (stop, "stop-color", css->attribute("fill"));
210 if (css->attribute("stop-color"))
211 sp_repr_css_set_property (stop, "stop-color", css->attribute("stop-color"));
214 if (css->attribute("stop-opacity")) { // direct setting of stop-opacity has priority
215 sp_repr_css_set_property (stop, "stop-opacity", css->attribute("stop-opacity"));
216 } else { // multiply all opacity properties:
217 gdouble accumulated = 1.0;
218 accumulated *= sp_svg_read_percentage(css->attribute("flood-opacity"), 1.0);
219 accumulated *= sp_svg_read_percentage(css->attribute("opacity"), 1.0);
220 accumulated *= sp_svg_read_percentage(css->attribute("stroke-opacity"), 1.0);
221 accumulated *= sp_svg_read_percentage(css->attribute("fill-opacity"), 1.0);
223 Inkscape::CSSOStringStream os;
224 os << accumulated;
225 sp_repr_css_set_property (stop, "stop-opacity", os.str().c_str());
227 if ((css->attribute("fill") && !strcmp(css->attribute("fill"), "none")) ||
228 (css->attribute("stroke") && !strcmp(css->attribute("stroke"), "none")))
229 sp_repr_css_set_property (stop, "stop-opacity", "0"); // if set to none, don't change color, set opacity to 0
230 }
232 if (!stop->attributeList()) { // nothing for us here, pass it on
233 sp_repr_css_attr_unref(stop);
234 return false;
235 }
237 for (GList const* sel = drag->selected; sel != NULL; sel = sel->next) { // for all selected draggers
238 GrDragger* dragger = (GrDragger*) sel->data;
239 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) { // for all draggables of dragger
240 GrDraggable *draggable = (GrDraggable *) i->data;
242 drag->local_change = true;
243 sp_item_gradient_stop_set_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke, stop);
244 }
245 }
247 //sp_repr_css_print(stop);
248 sp_repr_css_attr_unref(stop);
249 return true;
250 }
252 SPStop *
253 GrDrag::addStopNearPoint (SPItem *item, NR::Point mouse_p, double tolerance)
254 {
255 gfloat offset; // type of SPStop.offset = gfloat
256 SPGradient *gradient;
257 bool fill_or_stroke = true;
258 bool r1_knot = false;
260 bool addknot = false;
261 do {
262 gradient = sp_item_gradient (item, fill_or_stroke);
263 if (SP_IS_LINEARGRADIENT(gradient)) {
264 NR::Point begin = sp_item_gradient_get_coords(item, POINT_LG_BEGIN, 0, fill_or_stroke);
265 NR::Point end = sp_item_gradient_get_coords(item, POINT_LG_END, 0, fill_or_stroke);
267 NR::Point nearest = snap_vector_midpoint (mouse_p, begin, end, 0);
268 double dist_screen = NR::L2 (mouse_p - nearest);
269 if ( dist_screen < tolerance ) {
270 // add the knot
271 offset = get_offset_between_points(nearest, begin, end);
272 addknot = true;
273 break; // break out of the while loop: add only one knot
274 }
275 } else if (SP_IS_RADIALGRADIENT(gradient)) {
276 NR::Point begin = sp_item_gradient_get_coords(item, POINT_RG_CENTER, 0, fill_or_stroke);
277 NR::Point end = sp_item_gradient_get_coords(item, POINT_RG_R1, 0, fill_or_stroke);
278 NR::Point nearest = snap_vector_midpoint (mouse_p, begin, end, 0);
279 double dist_screen = NR::L2 (mouse_p - nearest);
280 if ( dist_screen < tolerance ) {
281 offset = get_offset_between_points(nearest, begin, end);
282 addknot = true;
283 r1_knot = true;
284 break; // break out of the while loop: add only one knot
285 }
287 end = sp_item_gradient_get_coords(item, POINT_RG_R2, 0, fill_or_stroke);
288 nearest = snap_vector_midpoint (mouse_p, begin, end, 0);
289 dist_screen = NR::L2 (mouse_p - nearest);
290 if ( dist_screen < tolerance ) {
291 offset = get_offset_between_points(nearest, begin, end);
292 addknot = true;
293 r1_knot = false;
294 break; // break out of the while loop: add only one knot
295 }
296 }
297 fill_or_stroke = !fill_or_stroke;
298 } while (!fill_or_stroke && !addknot) ;
300 if (addknot) {
301 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (gradient, false);
302 SPStop* prev_stop = sp_first_stop(vector);
303 SPStop* next_stop = sp_next_stop(prev_stop);
304 guint i = 1;
305 while ( (next_stop) && (next_stop->offset < offset) ) {
306 prev_stop = next_stop;
307 next_stop = sp_next_stop(next_stop);
308 i++;
309 }
310 if (!next_stop) {
311 // logical error: the endstop should have offset 1 and should always be more than this offset here
312 return NULL;
313 }
316 SPStop *newstop = sp_vector_add_stop (vector, prev_stop, next_stop, offset);
317 sp_gradient_ensure_vector (gradient);
318 updateDraggers();
320 return newstop;
321 }
323 return NULL;
324 }
327 bool
328 GrDrag::dropColor(SPItem *item, gchar *c, NR::Point p)
329 {
330 // first, see if we can drop onto one of the existing draggers
331 for (GList *i = draggers; i != NULL; i = i->next) { // for all draggables of dragger
332 GrDragger *d = (GrDragger *) i->data;
334 if (NR::L2(p - d->point)*desktop->current_zoom() < 5) {
335 SPCSSAttr *stop = sp_repr_css_attr_new ();
336 sp_repr_css_set_property (stop, "stop-color", c);
337 sp_repr_css_set_property (stop, "stop-opacity", "1");
338 for (GSList *j = d->draggables; j != NULL; j = j->next) { // for all draggables of dragger
339 GrDraggable *draggable = (GrDraggable *) j->data;
340 local_change = true;
341 sp_item_gradient_stop_set_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke, stop);
342 }
343 sp_repr_css_attr_unref(stop);
344 return true;
345 }
346 }
348 // now see if we're over line and create a new stop
349 bool over_line = false;
350 SPCtrlLine *line = NULL;
351 if (lines) {
352 for (GSList *l = lines; (l != NULL) && (!over_line); l = l->next) {
353 line = (SPCtrlLine*) l->data;
354 NR::Point nearest = snap_vector_midpoint (p, line->s, line->e, 0);
355 double dist_screen = NR::L2 (p - nearest) * desktop->current_zoom();
356 if (line->item && dist_screen < 5) {
357 SPStop *stop = addStopNearPoint (line->item, p, 5/desktop->current_zoom());
358 if (stop) {
359 SPCSSAttr *css = sp_repr_css_attr_new ();
360 sp_repr_css_set_property (css, "stop-color", c);
361 sp_repr_css_set_property (css, "stop-opacity", "1");
362 sp_repr_css_change (SP_OBJECT_REPR (stop), css, "style");
363 return true;
364 }
365 }
366 }
367 }
369 return false;
370 }
373 GrDrag::GrDrag(SPDesktop *desktop) {
375 this->desktop = desktop;
377 this->selection = sp_desktop_selection(desktop);
379 this->draggers = NULL;
380 this->lines = NULL;
381 this->selected = NULL;
383 this->hor_levels.clear();
384 this->vert_levels.clear();
386 this->local_change = false;
388 this->sel_changed_connection = this->selection->connectChanged(
389 sigc::bind (
390 sigc::ptr_fun(&gr_drag_sel_changed),
391 (gpointer)this )
393 );
394 this->sel_modified_connection = this->selection->connectModified(
395 sigc::bind(
396 sigc::ptr_fun(&gr_drag_sel_modified),
397 (gpointer)this )
398 );
400 this->style_set_connection = this->desktop->connectSetStyle(
401 sigc::bind(
402 sigc::ptr_fun(&gr_drag_style_set),
403 (gpointer)this )
404 );
406 this->style_query_connection = this->desktop->connectQueryStyle(
407 sigc::bind(
408 sigc::ptr_fun(&gr_drag_style_query),
409 (gpointer)this )
410 );
412 this->updateDraggers ();
413 this->updateLines ();
414 this->updateLevels ();
416 if (desktop->gr_item) {
417 this->setSelected (getDraggerFor (desktop->gr_item, desktop->gr_point_type, desktop->gr_point_i, desktop->gr_fill_or_stroke));
418 }
419 }
421 GrDrag::~GrDrag()
422 {
423 this->sel_changed_connection.disconnect();
424 this->sel_modified_connection.disconnect();
425 this->style_set_connection.disconnect();
426 this->style_query_connection.disconnect();
428 if (this->selected) {
429 GrDraggable *draggable = (GrDraggable *) ((GrDragger*)this->selected->data)->draggables->data;
430 desktop->gr_item = draggable->item;
431 desktop->gr_point_type = draggable->point_type;
432 desktop->gr_point_i = draggable->point_i;
433 desktop->gr_fill_or_stroke = draggable->fill_or_stroke;
434 } else {
435 desktop->gr_item = NULL;
436 desktop->gr_point_type = 0;
437 desktop->gr_point_i = 0;
438 desktop->gr_fill_or_stroke = true;
439 }
441 deselect_all();
442 for (GList *l = this->draggers; l != NULL; l = l->next) {
443 delete ((GrDragger *) l->data);
444 }
445 g_list_free (this->draggers);
446 this->draggers = NULL;
447 this->selected = NULL;
449 for (GSList *l = this->lines; l != NULL; l = l->next) {
450 gtk_object_destroy( GTK_OBJECT (l->data));
451 }
452 g_slist_free (this->lines);
453 this->lines = NULL;
454 }
456 GrDraggable::GrDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
457 {
458 this->item = item;
459 this->point_type = point_type;
460 this->point_i = point_i;
461 this->fill_or_stroke = fill_or_stroke;
463 g_object_ref (G_OBJECT (this->item));
464 }
466 GrDraggable::~GrDraggable ()
467 {
468 g_object_unref (G_OBJECT (this->item));
469 }
472 SPObject *
473 GrDraggable::getServer ()
474 {
475 if (!item)
476 return NULL;
478 SPObject *server = NULL;
479 if (fill_or_stroke)
480 server = SP_OBJECT_STYLE_FILL_SERVER (item);
481 else
482 server = SP_OBJECT_STYLE_STROKE_SERVER (item);
484 return server;
485 }
487 static void
488 gr_knot_moved_handler(SPKnot *knot, NR::Point const *ppointer, guint state, gpointer data)
489 {
490 GrDragger *dragger = (GrDragger *) data;
491 GrDrag *drag = dragger->parent;
493 NR::Point p = *ppointer;
495 // FIXME: take from prefs
496 double snap_dist = SNAP_DIST / dragger->parent->desktop->current_zoom();
498 if (state & GDK_SHIFT_MASK) {
499 // with Shift; unsnap if we carry more than one draggable
500 if (dragger->draggables && dragger->draggables->next) {
501 // create a new dragger
502 GrDragger *dr_new = new GrDragger (dragger->parent, dragger->point, NULL);
503 dragger->parent->draggers = g_list_prepend (dragger->parent->draggers, dr_new);
504 // relink to it all but the first draggable in the list
505 for (GSList const* i = dragger->draggables->next; i != NULL; i = i->next) {
506 GrDraggable *draggable = (GrDraggable *) i->data;
507 dr_new->addDraggable (draggable);
508 }
509 dr_new->updateKnotShape();
510 g_slist_free (dragger->draggables->next);
511 dragger->draggables->next = NULL;
512 dragger->updateKnotShape();
513 dragger->updateTip();
514 }
515 } else if (!(state & GDK_CONTROL_MASK)) {
516 // without Shift or Ctrl; see if we need to snap to another dragger
517 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
518 GrDragger *d_new = (GrDragger *) di->data;
519 if (dragger->mayMerge(d_new) && NR::L2 (d_new->point - p) < snap_dist) {
521 // Merge draggers:
522 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) { // for all draggables of dragger
523 GrDraggable *draggable = (GrDraggable *) i->data;
524 // copy draggable to d_new:
525 GrDraggable *da_new = new GrDraggable (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
526 d_new->addDraggable (da_new);
527 }
529 // unlink and delete this dragger
530 dragger->parent->draggers = g_list_remove (dragger->parent->draggers, dragger);
531 delete dragger;
533 // update the new merged dragger
534 d_new->fireDraggables(true, false, true);
535 d_new->parent->updateLines();
536 d_new->parent->setSelected (d_new);
537 d_new->updateKnotShape ();
538 d_new->updateTip ();
539 d_new->updateDependencies(true);
540 sp_document_done (sp_desktop_document (d_new->parent->desktop), SP_VERB_CONTEXT_GRADIENT,
541 _("Merge gradient handles"));
542 return;
543 }
544 }
545 }
547 if (!((state & GDK_SHIFT_MASK) || ((state & GDK_CONTROL_MASK) && (state & GDK_MOD1_MASK)))) {
548 // Try snapping to the grid or guides
549 SnapManager const &m = dragger->parent->desktop->namedview->snap_manager;
550 Inkscape::SnappedPoint s = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, p, NULL);
551 if (s.getDistance() < 1e6) {
552 p = s.getPoint();
553 sp_knot_moveto (knot, &p);
554 } else {
555 // No snapping so far, let's see if we need to snap to any of the levels
556 for (guint i = 0; i < dragger->parent->hor_levels.size(); i++) {
557 if (fabs(p[NR::Y] - dragger->parent->hor_levels[i]) < snap_dist) {
558 p[NR::Y] = dragger->parent->hor_levels[i];
559 sp_knot_moveto (knot, &p);
560 }
561 }
562 for (guint i = 0; i < dragger->parent->vert_levels.size(); i++) {
563 if (fabs(p[NR::X] - dragger->parent->vert_levels[i]) < snap_dist) {
564 p[NR::X] = dragger->parent->vert_levels[i];
565 sp_knot_moveto (knot, &p);
566 }
567 }
568 }
569 }
571 if (state & GDK_CONTROL_MASK) {
572 unsigned snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
573 /* 0 means no snapping. */
575 // This list will store snap vectors from all draggables of dragger
576 GSList *snap_vectors = NULL;
578 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) {
579 GrDraggable *draggable = (GrDraggable *) i->data;
581 NR::Point *dr_snap = NULL;
583 if (draggable->point_type == POINT_LG_BEGIN || draggable->point_type == POINT_LG_END) {
584 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
585 GrDragger *d_new = (GrDragger *) di->data;
586 if (d_new == dragger)
587 continue;
588 if (d_new->isA (draggable->item,
589 draggable->point_type == POINT_LG_BEGIN? POINT_LG_END : POINT_LG_BEGIN,
590 draggable->point_i,
591 draggable->fill_or_stroke)) {
592 // found the other end of the linear gradient;
593 if (state & GDK_SHIFT_MASK) {
594 // moving linear around center
595 NR::Point center = NR::Point (0.5*(d_new->point + dragger->point));
596 dr_snap = ¢er;
597 } else {
598 // moving linear around the other end
599 dr_snap = &d_new->point;
600 }
601 }
602 }
603 } else if (draggable->point_type == POINT_RG_R1 || draggable->point_type == POINT_RG_R2 || draggable->point_type == POINT_RG_FOCUS) {
604 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
605 GrDragger *d_new = (GrDragger *) di->data;
606 if (d_new == dragger)
607 continue;
608 if (d_new->isA (draggable->item,
609 POINT_RG_CENTER,
610 draggable->point_i,
611 draggable->fill_or_stroke)) {
612 // found the center of the radial gradient;
613 dr_snap = &(d_new->point);
614 }
615 }
616 } else if (draggable->point_type == POINT_RG_CENTER) {
617 // radial center snaps to hor/vert relative to its original position
618 dr_snap = &(dragger->point_original);
619 }
621 NR::Point *snap_vector = NULL;
622 if (dr_snap) {
623 if (state & GDK_MOD1_MASK) {
624 // with Alt, snap to the original angle and its perpendiculars
625 snap_vector = get_snap_vector (p, *dr_snap, M_PI/2, NR::atan2 (dragger->point_original - *dr_snap));
626 } else {
627 // with Ctrl, snap to M_PI/snaps
628 snap_vector = get_snap_vector (p, *dr_snap, M_PI/snaps, 0);
629 }
630 }
631 if (snap_vector) {
632 snap_vectors = g_slist_prepend (snap_vectors, snap_vector);
633 }
634 }
636 // Move by the smallest of snap vectors:
637 NR::Point move(9999, 9999);
638 for (GSList const *i = snap_vectors; i != NULL; i = i->next) {
639 NR::Point *snap_vector = (NR::Point *) i->data;
640 if (NR::L2(*snap_vector) < NR::L2(move))
641 move = *snap_vector;
642 }
643 if (move[NR::X] < 9999) {
644 p += move;
645 sp_knot_moveto (knot, &p);
646 }
648 g_slist_free(snap_vectors);
649 }
651 drag->keep_selection = (bool) g_list_find(drag->selected, dragger);
652 bool scale_radial = (state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK);
654 if (drag->keep_selection) {
655 NR::Point diff = p - dragger->point;
656 drag->selected_move_nowrite (diff[NR::X], diff[NR::Y], scale_radial);
657 } else {
658 dragger->point = p;
659 dragger->fireDraggables (false, scale_radial);
660 dragger->updateDependencies(false);
661 }
663 }
666 static void
667 gr_midpoint_limits(GrDragger *dragger, SPObject *server, NR::Point *begin, NR::Point *end, NR::Point *low_lim, NR::Point *high_lim, GSList **moving)
668 {
670 GrDrag *drag = dragger->parent;
671 // a midpoint dragger can (logically) only contain one GrDraggable
672 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
674 // get begin and end points between which dragging is allowed:
675 // the draglimits are between knot(lowest_i - 1) and knot(highest_i + 1)
676 *moving = g_slist_append(*moving, dragger);
678 guint lowest_i = draggable->point_i;
679 guint highest_i = draggable->point_i;
680 GrDragger *lowest_dragger = dragger;
681 GrDragger *highest_dragger = dragger;
682 if (dragger->isSelected()) {
683 GrDragger* d_add;
684 while ( true )
685 {
686 d_add = drag->getDraggerFor(draggable->item, draggable->point_type, lowest_i - 1, draggable->fill_or_stroke);
687 if ( d_add && g_list_find(drag->selected, d_add) ) {
688 lowest_i = lowest_i - 1;
689 *moving = g_slist_prepend(*moving, d_add);
690 lowest_dragger = d_add;
691 } else {
692 break;
693 }
694 }
696 while ( true )
697 {
698 d_add = drag->getDraggerFor(draggable->item, draggable->point_type, highest_i + 1, draggable->fill_or_stroke);
699 if ( d_add && g_list_find(drag->selected, d_add) ) {
700 highest_i = highest_i + 1;
701 *moving = g_slist_append(*moving, d_add);
702 highest_dragger = d_add;
703 } else {
704 break;
705 }
706 }
707 }
709 if ( SP_IS_LINEARGRADIENT(server) ) {
710 guint num = SP_LINEARGRADIENT(server)->vector.stops.size();
711 GrDragger *d_temp;
712 if (lowest_i == 1) {
713 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_BEGIN, 0, draggable->fill_or_stroke);
714 } else {
715 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_MID, lowest_i - 1, draggable->fill_or_stroke);
716 }
717 if (d_temp)
718 *begin = d_temp->point;
720 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_MID, highest_i + 1, draggable->fill_or_stroke);
721 if (d_temp == NULL) {
722 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_END, num-1, draggable->fill_or_stroke);
723 }
724 if (d_temp)
725 *end = d_temp->point;
726 } else if ( SP_IS_RADIALGRADIENT(server) ) {
727 guint num = SP_RADIALGRADIENT(server)->vector.stops.size();
728 GrDragger *d_temp;
729 if (lowest_i == 1) {
730 d_temp = drag->getDraggerFor (draggable->item, POINT_RG_CENTER, 0, draggable->fill_or_stroke);
731 } else {
732 d_temp = drag->getDraggerFor (draggable->item, draggable->point_type, lowest_i - 1, draggable->fill_or_stroke);
733 }
734 if (d_temp)
735 *begin = d_temp->point;
737 d_temp = drag->getDraggerFor (draggable->item, draggable->point_type, highest_i + 1, draggable->fill_or_stroke);
738 if (d_temp == NULL) {
739 d_temp = drag->getDraggerFor (draggable->item, (draggable->point_type==POINT_RG_MID1) ? POINT_RG_R1 : POINT_RG_R2, num-1, draggable->fill_or_stroke);
740 }
741 if (d_temp)
742 *end = d_temp->point;
743 }
745 *low_lim = dragger->point - (lowest_dragger->point - *begin);
746 *high_lim = dragger->point - (highest_dragger->point - *end);
747 }
751 /**
752 Called when a midpoint knot is dragged.
753 */
754 static void
755 gr_knot_moved_midpoint_handler(SPKnot *knot, NR::Point const *ppointer, guint state, gpointer data)
756 {
757 GrDragger *dragger = (GrDragger *) data;
758 GrDrag *drag = dragger->parent;
759 // a midpoint dragger can (logically) only contain one GrDraggable
760 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
762 // FIXME: take from prefs
763 double snap_fraction = 0.1;
765 NR::Point p = *ppointer;
766 NR::Point begin(0,0), end(0,0);
767 NR::Point low_lim(0,0), high_lim(0,0);
769 SPObject *server = draggable->getServer();
771 GSList *moving = NULL;
772 gr_midpoint_limits(dragger, server, &begin, &end, &low_lim, &high_lim, &moving);
774 if (state & GDK_CONTROL_MASK) {
775 p = snap_vector_midpoint (p, low_lim, high_lim, snap_fraction);
776 } else {
777 p = snap_vector_midpoint (p, low_lim, high_lim, 0);
778 }
779 NR::Point displacement = p - dragger->point;
781 for (GSList const* i = moving; i != NULL; i = i->next) {
782 GrDragger *drg = (GrDragger*) i->data;
783 SPKnot *drgknot = drg->knot;
784 NR::Point this_move = displacement;
785 if (state & GDK_MOD1_MASK) {
786 // FIXME: unify all these profiles (here, in nodepath, in tweak) in one place
787 double alpha = 1.5;
788 if (NR::L2(drg->point - dragger->point) + NR::L2(drg->point - begin) - 1e-3 > NR::L2(dragger->point - begin)) { // drg is on the end side from dragger
789 double x = NR::L2(drg->point - dragger->point)/NR::L2(end - dragger->point);
790 this_move = (0.5 * cos (M_PI * (pow(x, alpha))) + 0.5) * this_move;
791 } else { // drg is on the begin side from dragger
792 double x = NR::L2(drg->point - dragger->point)/NR::L2(begin - dragger->point);
793 this_move = (0.5 * cos (M_PI * (pow(x, alpha))) + 0.5) * this_move;
794 }
795 }
796 drg->point += this_move;
797 sp_knot_moveto (drgknot, & drg->point);
798 drg->fireDraggables (false);
799 drg->updateDependencies(false);
800 }
802 g_slist_free(moving);
804 drag->keep_selection = dragger->isSelected();
805 }
809 static void
810 gr_knot_grabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
811 {
812 GrDragger *dragger = (GrDragger *) data;
814 sp_canvas_force_full_redraw_after_interruptions(dragger->parent->desktop->canvas, 5);
815 }
817 /**
818 Called when the mouse releases a dragger knot; changes gradient writing to repr, updates other draggers if needed
819 */
820 static void
821 gr_knot_ungrabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
822 {
823 GrDragger *dragger = (GrDragger *) data;
825 sp_canvas_end_forced_full_redraws(dragger->parent->desktop->canvas);
827 dragger->point_original = dragger->point = knot->pos;
829 if ((state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK)) {
830 dragger->fireDraggables (true, true);
831 } else {
832 dragger->fireDraggables (true);
833 }
835 for (GList *i = dragger->parent->selected; i != NULL; i = i->next) {
836 GrDragger *d = (GrDragger *) i->data;
837 if (d == dragger)
838 continue;
839 d->fireDraggables (true);
840 }
842 // make this dragger selected
843 if (!dragger->parent->keep_selection) {
844 dragger->parent->setSelected (dragger);
845 }
846 dragger->parent->keep_selection = false;
848 dragger->updateDependencies(true);
850 // we did an undoable action
851 sp_document_done (sp_desktop_document (dragger->parent->desktop), SP_VERB_CONTEXT_GRADIENT,
852 _("Move gradient handle"));
853 }
855 /**
856 Called when a dragger knot is clicked; selects the dragger or deletes it depending on the
857 state of the keyboard keys
858 */
859 static void
860 gr_knot_clicked_handler(SPKnot *knot, guint state, gpointer data)
861 {
862 GrDragger *dragger = (GrDragger *) data;
863 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
864 if (!draggable) return;
866 if ( (state & GDK_CONTROL_MASK) && (state & GDK_MOD1_MASK ) ) {
867 // delete this knot from vector
868 SPGradient *gradient = sp_item_gradient (draggable->item, draggable->fill_or_stroke);
869 gradient = sp_gradient_get_vector (gradient, false);
870 if (gradient->vector.stops.size() > 2) { // 2 is the minimum
871 SPStop *stop = NULL;
872 switch (draggable->point_type) { // if we delete first or last stop, move the next/previous to the edge
873 case POINT_LG_BEGIN:
874 case POINT_RG_CENTER:
875 stop = sp_first_stop(gradient);
876 {
877 SPStop *next = sp_next_stop (stop);
878 if (next) {
879 next->offset = 0;
880 sp_repr_set_css_double (SP_OBJECT_REPR (next), "offset", 0);
881 }
882 }
883 break;
884 case POINT_LG_END:
885 case POINT_RG_R1:
886 case POINT_RG_R2:
887 stop = sp_last_stop(gradient);
888 {
889 SPStop *prev = sp_prev_stop (stop, gradient);
890 if (prev) {
891 prev->offset = 1;
892 sp_repr_set_css_double (SP_OBJECT_REPR (prev), "offset", 1);
893 }
894 }
895 break;
896 case POINT_LG_MID:
897 case POINT_RG_MID1:
898 case POINT_RG_MID2:
899 stop = sp_get_stop_i(gradient, draggable->point_i);
900 break;
901 }
903 SP_OBJECT_REPR(gradient)->removeChild(SP_OBJECT_REPR(stop));
904 sp_document_done (SP_OBJECT_DOCUMENT (gradient), SP_VERB_CONTEXT_GRADIENT,
905 _("Delete gradient stop"));
906 }
907 } else {
908 // select the dragger
909 dragger->point_original = dragger->point;
911 if ( state & GDK_SHIFT_MASK ) {
912 dragger->parent->setSelected (dragger, true, false);
913 } else {
914 dragger->parent->setSelected (dragger);
915 }
916 }
917 }
919 /**
920 Called when a dragger knot is doubleclicked; opens gradient editor with the stop from the first draggable
921 */
922 static void
923 gr_knot_doubleclicked_handler (SPKnot *knot, guint state, gpointer data)
924 {
925 GrDragger *dragger = (GrDragger *) data;
927 dragger->point_original = dragger->point;
929 if (dragger->draggables == NULL)
930 return;
932 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
933 sp_item_gradient_edit_stop (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
934 }
936 /**
937 Act upon all draggables of the dragger, setting them to the dragger's point
938 */
939 void
940 GrDragger::fireDraggables (bool write_repr, bool scale_radial, bool merging_focus)
941 {
942 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
943 GrDraggable *draggable = (GrDraggable *) i->data;
945 // set local_change flag so that selection_changed callback does not regenerate draggers
946 this->parent->local_change = true;
948 // change gradient, optionally writing to repr; prevent focus from moving if it's snapped
949 // to the center, unless it's the first update upon merge when we must snap it to the point
950 if (merging_focus ||
951 !(draggable->point_type == POINT_RG_FOCUS && this->isA(draggable->item, POINT_RG_CENTER, draggable->point_i, draggable->fill_or_stroke)))
952 {
953 sp_item_gradient_set_coords (draggable->item, draggable->point_type, draggable->point_i, this->point, draggable->fill_or_stroke, write_repr, scale_radial);
954 }
955 }
956 }
958 /**
959 Checks if the dragger has a draggable with this point_type
960 */
961 bool
962 GrDragger::isA (gint point_type)
963 {
964 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
965 GrDraggable *draggable = (GrDraggable *) i->data;
966 if (draggable->point_type == point_type) {
967 return true;
968 }
969 }
970 return false;
971 }
973 /**
974 Checks if the dragger has a draggable with this item, point_type, fill_or_stroke
975 */
976 bool
977 GrDragger::isA (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke)
978 {
979 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
980 GrDraggable *draggable = (GrDraggable *) i->data;
981 if ( (draggable->point_type == point_type) && (draggable->point_i == point_i) && (draggable->item == item) && (draggable->fill_or_stroke == fill_or_stroke) ) {
982 return true;
983 }
984 }
985 return false;
986 }
988 bool
989 GrDraggable::mayMerge (GrDraggable *da2)
990 {
991 if ((this->item == da2->item) && (this->fill_or_stroke == da2->fill_or_stroke)) {
992 // we must not merge the points of the same gradient!
993 if (!((this->point_type == POINT_RG_FOCUS && da2->point_type == POINT_RG_CENTER) ||
994 (this->point_type == POINT_RG_CENTER && da2->point_type == POINT_RG_FOCUS))) {
995 // except that we can snap center and focus together
996 return false;
997 }
998 }
999 // disable merging of midpoints.
1000 if ( (this->point_type == POINT_LG_MID) || (da2->point_type == POINT_LG_MID)
1001 || (this->point_type == POINT_RG_MID1) || (da2->point_type == POINT_RG_MID1)
1002 || (this->point_type == POINT_RG_MID2) || (da2->point_type == POINT_RG_MID2) )
1003 return false;
1005 return true;
1006 }
1008 bool
1009 GrDragger::mayMerge (GrDragger *other)
1010 {
1011 if (this == other)
1012 return false;
1014 for (GSList const* i = this->draggables; i != NULL; i = i->next) { // for all draggables of this
1015 GrDraggable *da1 = (GrDraggable *) i->data;
1016 for (GSList const* j = other->draggables; j != NULL; j = j->next) { // for all draggables of other
1017 GrDraggable *da2 = (GrDraggable *) j->data;
1018 if (!da1->mayMerge(da2))
1019 return false;
1020 }
1021 }
1022 return true;
1023 }
1025 bool
1026 GrDragger::mayMerge (GrDraggable *da2)
1027 {
1028 for (GSList const* i = this->draggables; i != NULL; i = i->next) { // for all draggables of this
1029 GrDraggable *da1 = (GrDraggable *) i->data;
1030 if (!da1->mayMerge(da2))
1031 return false;
1032 }
1033 return true;
1034 }
1036 /**
1037 Updates the statusbar tip of the dragger knot, based on its draggables
1038 */
1039 void
1040 GrDragger::updateTip ()
1041 {
1042 if (this->knot && this->knot->tip) {
1043 g_free (this->knot->tip);
1044 this->knot->tip = NULL;
1045 }
1047 if (g_slist_length (this->draggables) == 1) {
1048 GrDraggable *draggable = (GrDraggable *) this->draggables->data;
1049 char *item_desc = sp_item_description(draggable->item);
1050 switch (draggable->point_type) {
1051 case POINT_LG_MID:
1052 case POINT_RG_MID1:
1053 case POINT_RG_MID2:
1054 this->knot->tip = g_strdup_printf (_("%s %d for: %s%s; drag with <b>Ctrl</b> to snap offset; click with <b>Ctrl+Alt</b> to delete stop"),
1055 _(gr_knot_descr[draggable->point_type]),
1056 draggable->point_i,
1057 item_desc,
1058 draggable->fill_or_stroke == false ? _(" (stroke)") : "");
1059 break;
1061 default:
1062 this->knot->tip = g_strdup_printf (_("%s for: %s%s; drag with <b>Ctrl</b> to snap angle, with <b>Ctrl+Alt</b> to preserve angle, with <b>Ctrl+Shift</b> to scale around center"),
1063 _(gr_knot_descr[draggable->point_type]),
1064 item_desc,
1065 draggable->fill_or_stroke == false ? _(" (stroke)") : "");
1066 break;
1067 }
1068 g_free(item_desc);
1069 } else if (g_slist_length (draggables) == 2 && isA (POINT_RG_CENTER) && isA (POINT_RG_FOCUS)) {
1070 this->knot->tip = g_strdup_printf (_("Radial gradient <b>center</b> and <b>focus</b>; drag with <b>Shift</b> to separate focus"));
1071 } else {
1072 int length = g_slist_length (this->draggables);
1073 this->knot->tip = g_strdup_printf (ngettext("Gradient point shared by <b>%d</b> gradient; drag with <b>Shift</b> to separate",
1074 "Gradient point shared by <b>%d</b> gradients; drag with <b>Shift</b> to separate",
1075 length),
1076 length);
1077 }
1078 }
1080 /**
1081 Adds a draggable to the dragger
1082 */
1083 void
1084 GrDragger::updateKnotShape ()
1085 {
1086 if (!draggables)
1087 return;
1088 GrDraggable *last = (GrDraggable *) g_slist_last(draggables)->data;
1089 g_object_set (G_OBJECT (this->knot->item), "shape", gr_knot_shapes[last->point_type], NULL);
1090 }
1092 /**
1093 Adds a draggable to the dragger
1094 */
1095 void
1096 GrDragger::addDraggable (GrDraggable *draggable)
1097 {
1098 this->draggables = g_slist_prepend (this->draggables, draggable);
1100 this->updateTip();
1101 }
1104 /**
1105 Moves this dragger to the point of the given draggable, acting upon all other draggables
1106 */
1107 void
1108 GrDragger::moveThisToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr)
1109 {
1110 this->point = sp_item_gradient_get_coords (item, point_type, point_i, fill_or_stroke);
1111 this->point_original = this->point;
1113 sp_knot_moveto (this->knot, &(this->point));
1115 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1116 GrDraggable *da = (GrDraggable *) i->data;
1117 if ( (da->item == item) &&
1118 (point_type == -1 || da->point_type == point_type) &&
1119 (point_i == -1 || da->point_i == point_i) &&
1120 (da->fill_or_stroke == fill_or_stroke) ) {
1121 continue;
1122 }
1123 sp_item_gradient_set_coords (da->item, da->point_type, da->point_i, this->point, da->fill_or_stroke, write_repr, false);
1124 }
1125 // FIXME: here we should also call this->updateDependencies(write_repr); to propagate updating, but how to prevent loops?
1126 }
1129 /**
1130 Moves all midstop draggables that depend on this one
1131 */
1132 void
1133 GrDragger::updateMidstopDependencies (GrDraggable *draggable, bool write_repr) {
1134 SPObject *server = draggable->getServer();
1135 if (!server)
1136 return;
1137 guint num = SP_GRADIENT(server)->vector.stops.size();
1138 if (num <= 2) return;
1140 if ( SP_IS_LINEARGRADIENT(server) ) {
1141 for ( guint i = 1; i < num - 1; i++ ) {
1142 this->moveOtherToDraggable (draggable->item, POINT_LG_MID, i, draggable->fill_or_stroke, write_repr);
1143 }
1144 } else if ( SP_IS_RADIALGRADIENT(server) ) {
1145 for ( guint i = 1; i < num - 1; i++ ) {
1146 this->moveOtherToDraggable (draggable->item, POINT_RG_MID1, i, draggable->fill_or_stroke, write_repr);
1147 this->moveOtherToDraggable (draggable->item, POINT_RG_MID2, i, draggable->fill_or_stroke, write_repr);
1148 }
1149 }
1150 }
1153 /**
1154 Moves all draggables that depend on this one
1155 */
1156 void
1157 GrDragger::updateDependencies (bool write_repr)
1158 {
1159 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1160 GrDraggable *draggable = (GrDraggable *) i->data;
1161 switch (draggable->point_type) {
1162 case POINT_LG_BEGIN:
1163 {
1164 // the end point is dependent only when dragging with ctrl+shift
1165 this->moveOtherToDraggable (draggable->item, POINT_LG_END, -1, draggable->fill_or_stroke, write_repr);
1167 this->updateMidstopDependencies (draggable, write_repr);
1168 }
1169 break;
1170 case POINT_LG_END:
1171 {
1172 // the begin point is dependent only when dragging with ctrl+shift
1173 this->moveOtherToDraggable (draggable->item, POINT_LG_BEGIN, 0, draggable->fill_or_stroke, write_repr);
1175 this->updateMidstopDependencies (draggable, write_repr);
1176 }
1177 break;
1178 case POINT_LG_MID:
1179 // no other nodes depend on mid points.
1180 break;
1181 case POINT_RG_R2:
1182 this->moveOtherToDraggable (draggable->item, POINT_RG_R1, -1, draggable->fill_or_stroke, write_repr);
1183 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, -1, draggable->fill_or_stroke, write_repr);
1184 this->updateMidstopDependencies (draggable, write_repr);
1185 break;
1186 case POINT_RG_R1:
1187 this->moveOtherToDraggable (draggable->item, POINT_RG_R2, -1, draggable->fill_or_stroke, write_repr);
1188 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, -1, draggable->fill_or_stroke, write_repr);
1189 this->updateMidstopDependencies (draggable, write_repr);
1190 break;
1191 case POINT_RG_CENTER:
1192 this->moveOtherToDraggable (draggable->item, POINT_RG_R1, -1, draggable->fill_or_stroke, write_repr);
1193 this->moveOtherToDraggable (draggable->item, POINT_RG_R2, -1, draggable->fill_or_stroke, write_repr);
1194 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, -1, draggable->fill_or_stroke, write_repr);
1195 this->updateMidstopDependencies (draggable, write_repr);
1196 break;
1197 case POINT_RG_FOCUS:
1198 // nothing can depend on that
1199 break;
1200 case POINT_RG_MID1:
1201 this->moveOtherToDraggable (draggable->item, POINT_RG_MID2, draggable->point_i, draggable->fill_or_stroke, write_repr);
1202 break;
1203 case POINT_RG_MID2:
1204 this->moveOtherToDraggable (draggable->item, POINT_RG_MID1, draggable->point_i, draggable->fill_or_stroke, write_repr);
1205 break;
1206 default:
1207 break;
1208 }
1209 }
1210 }
1214 GrDragger::GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable)
1215 {
1216 this->draggables = NULL;
1218 this->parent = parent;
1220 this->point = p;
1221 this->point_original = p;
1223 // create the knot
1224 this->knot = sp_knot_new (parent->desktop, NULL);
1225 this->knot->setMode(SP_KNOT_MODE_XOR);
1226 this->knot->setFill(GR_KNOT_COLOR_NORMAL, GR_KNOT_COLOR_MOUSEOVER, GR_KNOT_COLOR_MOUSEOVER);
1227 this->knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1228 sp_knot_update_ctrl(this->knot);
1230 // move knot to the given point
1231 sp_knot_set_position (this->knot, &p, SP_KNOT_STATE_NORMAL);
1232 sp_knot_show (this->knot);
1234 // connect knot's signals
1235 if ( (draggable) // it can be NULL if a node in unsnapped (eg. focus point unsnapped from center)
1236 // luckily, midstops never snap to other nodes so are never unsnapped...
1237 && ( (draggable->point_type == POINT_LG_MID)
1238 || (draggable->point_type == POINT_RG_MID1)
1239 || (draggable->point_type == POINT_RG_MID2) ) )
1240 {
1241 this->handler_id = g_signal_connect (G_OBJECT (this->knot), "moved", G_CALLBACK (gr_knot_moved_midpoint_handler), this);
1242 } else {
1243 this->handler_id = g_signal_connect (G_OBJECT (this->knot), "moved", G_CALLBACK (gr_knot_moved_handler), this);
1244 }
1245 g_signal_connect (G_OBJECT (this->knot), "clicked", G_CALLBACK (gr_knot_clicked_handler), this);
1246 g_signal_connect (G_OBJECT (this->knot), "doubleclicked", G_CALLBACK (gr_knot_doubleclicked_handler), this);
1247 g_signal_connect (G_OBJECT (this->knot), "grabbed", G_CALLBACK (gr_knot_grabbed_handler), this);
1248 g_signal_connect (G_OBJECT (this->knot), "ungrabbed", G_CALLBACK (gr_knot_ungrabbed_handler), this);
1250 // add the initial draggable
1251 if (draggable)
1252 this->addDraggable (draggable);
1253 updateKnotShape();
1254 }
1256 GrDragger::~GrDragger ()
1257 {
1258 // unselect if it was selected
1259 this->parent->setDeselected(this);
1261 // disconnect signals
1262 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_moved_handler), this);
1263 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_clicked_handler), this);
1264 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_doubleclicked_handler), this);
1265 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_grabbed_handler), this);
1266 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_ungrabbed_handler), this);
1268 /* unref should call destroy */
1269 g_object_unref (G_OBJECT (this->knot));
1271 // delete all draggables
1272 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1273 delete ((GrDraggable *) i->data);
1274 }
1275 g_slist_free (this->draggables);
1276 this->draggables = NULL;
1277 }
1279 /**
1280 Select the dragger which has the given draggable.
1281 */
1282 GrDragger *
1283 GrDrag::getDraggerFor (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke)
1284 {
1285 for (GList const* i = this->draggers; i != NULL; i = i->next) {
1286 GrDragger *dragger = (GrDragger *) i->data;
1287 for (GSList const* j = dragger->draggables; j != NULL; j = j->next) {
1288 GrDraggable *da2 = (GrDraggable *) j->data;
1289 if ( (da2->item == item) &&
1290 (point_type == -1 || da2->point_type == point_type) && // -1 means this does not matter
1291 (point_i == -1 || da2->point_i == point_i) && // -1 means this does not matter
1292 (da2->fill_or_stroke == fill_or_stroke)) {
1293 return (dragger);
1294 }
1295 }
1296 }
1297 return NULL;
1298 }
1301 void
1302 GrDragger::moveOtherToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr)
1303 {
1304 GrDragger *d = this->parent->getDraggerFor (item, point_type, point_i, fill_or_stroke);
1305 if (d && d != this) {
1306 d->moveThisToDraggable (item, point_type, point_i, fill_or_stroke, write_repr);
1307 }
1308 }
1311 /**
1312 Draw this dragger as selected
1313 */
1314 void
1315 GrDragger::select()
1316 {
1317 this->knot->fill [SP_KNOT_STATE_NORMAL] = GR_KNOT_COLOR_SELECTED;
1318 g_object_set (G_OBJECT (this->knot->item), "fill_color", GR_KNOT_COLOR_SELECTED, NULL);
1319 }
1321 /**
1322 Draw this dragger as normal (deselected)
1323 */
1324 void
1325 GrDragger::deselect()
1326 {
1327 this->knot->fill [SP_KNOT_STATE_NORMAL] = GR_KNOT_COLOR_NORMAL;
1328 g_object_set (G_OBJECT (this->knot->item), "fill_color", GR_KNOT_COLOR_NORMAL, NULL);
1329 }
1331 bool
1332 GrDragger::isSelected()
1333 {
1334 return g_list_find (parent->selected, this);
1335 }
1337 /**
1338 \brief Deselect all stops/draggers (private)
1339 */
1340 void
1341 GrDrag::deselect_all()
1342 {
1343 while (selected) {
1344 ( (GrDragger*) selected->data)->deselect();
1345 selected = g_list_remove(selected, selected->data);
1346 }
1347 }
1349 /**
1350 \brief Deselect all stops/draggers (public; emits signal)
1351 */
1352 void
1353 GrDrag::deselectAll()
1354 {
1355 deselect_all();
1356 this->desktop->emitToolSubselectionChanged(NULL);
1357 }
1359 /**
1360 \brief Select all stops/draggers
1361 */
1362 void
1363 GrDrag::selectAll()
1364 {
1365 for (GList *l = this->draggers; l != NULL; l = l->next) {
1366 GrDragger *d = ((GrDragger *) l->data);
1367 setSelected (d, true, true);
1368 }
1369 }
1371 /**
1372 \brief Select all stops/draggers that match the coords
1373 */
1374 void
1375 GrDrag::selectByCoords(std::vector<NR::Point> coords)
1376 {
1377 for (GList *l = this->draggers; l != NULL; l = l->next) {
1378 GrDragger *d = ((GrDragger *) l->data);
1379 for (guint k = 0; k < coords.size(); k++) {
1380 if (NR::L2 (d->point - coords[k]) < 1e-4) {
1381 setSelected (d, true, true);
1382 }
1383 }
1384 }
1385 }
1388 /**
1389 \brief Select all stops/draggers that fall within the rect
1390 */
1391 void
1392 GrDrag::selectRect(NR::Rect const &r)
1393 {
1394 for (GList *l = this->draggers; l != NULL; l = l->next) {
1395 GrDragger *d = ((GrDragger *) l->data);
1396 if (r.contains(d->point)) {
1397 setSelected (d, true, true);
1398 }
1399 }
1400 }
1402 /**
1403 \brief Select a dragger
1404 \param dragger The dragger to select
1405 \param add_to_selection If true, add to selection, otherwise deselect others
1406 \param override If true, always select this node, otherwise toggle selected status
1407 */
1408 void
1409 GrDrag::setSelected (GrDragger *dragger, bool add_to_selection, bool override)
1410 {
1411 GrDragger *seldragger = NULL;
1413 if (add_to_selection) {
1414 if (!dragger) return;
1415 if (override) {
1416 if (!g_list_find(selected, dragger)) {
1417 selected = g_list_prepend(selected, dragger);
1418 }
1419 dragger->select();
1420 seldragger = dragger;
1421 } else { // toggle
1422 if (g_list_find(selected, dragger)) {
1423 selected = g_list_remove(selected, dragger);
1424 dragger->deselect();
1425 if (selected) {
1426 seldragger = (GrDragger*) selected->data; // select the dragger that is first in the list
1427 }
1428 } else {
1429 selected = g_list_prepend(selected, dragger);
1430 dragger->select();
1431 seldragger = dragger;
1432 }
1433 }
1434 } else {
1435 deselect_all();
1436 if (dragger) {
1437 selected = g_list_prepend(selected, dragger);
1438 dragger->select();
1439 seldragger = dragger;
1440 }
1441 }
1442 if (seldragger) {
1443 this->desktop->emitToolSubselectionChanged((gpointer) seldragger);
1444 }
1445 }
1447 /**
1448 \brief Deselect a dragger
1449 \param dragger The dragger to deselect
1450 */
1451 void
1452 GrDrag::setDeselected (GrDragger *dragger)
1453 {
1454 if (g_list_find(selected, dragger)) {
1455 selected = g_list_remove(selected, dragger);
1456 dragger->deselect();
1457 }
1458 this->desktop->emitToolSubselectionChanged((gpointer) (selected ? selected->data : NULL ));
1459 }
1463 /**
1464 Create a line from p1 to p2 and add it to the lines list
1465 */
1466 void
1467 GrDrag::addLine (SPItem *item, NR::Point p1, NR::Point p2, guint32 rgba)
1468 {
1469 SPCanvasItem *line = sp_canvas_item_new(sp_desktop_controls(this->desktop),
1470 SP_TYPE_CTRLLINE, NULL);
1471 SP_CTRLLINE(line)->item = item;
1472 sp_ctrlline_set_coords(SP_CTRLLINE(line), p1, p2);
1473 if (rgba != GR_LINE_COLOR_FILL) // fill is the default, so don't set color for it to speed up redraw
1474 sp_ctrlline_set_rgba32 (SP_CTRLLINE(line), rgba);
1475 sp_canvas_item_show (line);
1476 this->lines = g_slist_append (this->lines, line);
1477 }
1479 /**
1480 If there already exists a dragger within MERGE_DIST of p, add the draggable to it; otherwise create
1481 new dragger and add it to draggers list
1482 */
1483 void
1484 GrDrag::addDragger (GrDraggable *draggable)
1485 {
1486 NR::Point p = sp_item_gradient_get_coords (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
1488 for (GList *i = this->draggers; i != NULL; i = i->next) {
1489 GrDragger *dragger = (GrDragger *) i->data;
1490 if (dragger->mayMerge (draggable) && NR::L2 (dragger->point - p) < MERGE_DIST) {
1491 // distance is small, merge this draggable into dragger, no need to create new dragger
1492 dragger->addDraggable (draggable);
1493 dragger->updateKnotShape();
1494 return;
1495 }
1496 }
1498 GrDragger *new_dragger = new GrDragger(this, p, draggable);
1499 // fixme: draggers should be added AFTER the last one: this way tabbing through them will be from begin to end.
1500 this->draggers = g_list_append (this->draggers, new_dragger);
1501 }
1503 /**
1504 Add draggers for the radial gradient rg on item
1505 */
1506 void
1507 GrDrag::addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke)
1508 {
1509 addDragger (new GrDraggable (item, POINT_RG_CENTER, 0, fill_or_stroke));
1510 guint num = rg->vector.stops.size();
1511 if (num > 2) {
1512 for ( guint i = 1; i < num - 1; i++ ) {
1513 addDragger (new GrDraggable (item, POINT_RG_MID1, i, fill_or_stroke));
1514 }
1515 }
1516 addDragger (new GrDraggable (item, POINT_RG_R1, num-1, fill_or_stroke));
1517 if (num > 2) {
1518 for ( guint i = 1; i < num - 1; i++ ) {
1519 addDragger (new GrDraggable (item, POINT_RG_MID2, i, fill_or_stroke));
1520 }
1521 }
1522 addDragger (new GrDraggable (item, POINT_RG_R2, num-1, fill_or_stroke));
1523 addDragger (new GrDraggable (item, POINT_RG_FOCUS, 0, fill_or_stroke));
1524 }
1526 /**
1527 Add draggers for the linear gradient lg on item
1528 */
1529 void
1530 GrDrag::addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke)
1531 {
1532 addDragger (new GrDraggable (item, POINT_LG_BEGIN, 0, fill_or_stroke));
1533 guint num = lg->vector.stops.size();
1534 if (num > 2) {
1535 for ( guint i = 1; i < num - 1; i++ ) {
1536 addDragger (new GrDraggable (item, POINT_LG_MID, i, fill_or_stroke));
1537 }
1538 }
1539 addDragger (new GrDraggable (item, POINT_LG_END, num-1, fill_or_stroke));
1540 }
1542 /**
1543 Artificially grab the knot of this dragger; used by the gradient context
1544 */
1545 void
1546 GrDrag::grabKnot (GrDragger *dragger, gint x, gint y, guint32 etime)
1547 {
1548 if (dragger) {
1549 sp_knot_start_dragging (dragger->knot, dragger->point, x, y, etime);
1550 }
1551 }
1553 /**
1554 Artificially grab the knot of the dragger with this draggable; used by the gradient context
1555 */
1556 void
1557 GrDrag::grabKnot (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime)
1558 {
1559 GrDragger *dragger = getDraggerFor (item, point_type, point_i, fill_or_stroke);
1560 if (dragger) {
1561 sp_knot_start_dragging (dragger->knot, dragger->point, x, y, etime);
1562 }
1563 }
1565 /**
1566 Regenerates the draggers list from the current selection; is called when selection is changed or
1567 modified, also when a radial dragger needs to update positions of other draggers in the gradient
1568 */
1569 void
1570 GrDrag::updateDraggers ()
1571 {
1572 while (selected) {
1573 selected = g_list_remove(selected, selected->data);
1574 }
1575 // delete old draggers
1576 for (GList const* i = this->draggers; i != NULL; i = i->next) {
1577 delete ((GrDragger *) i->data);
1578 }
1579 g_list_free (this->draggers);
1580 this->draggers = NULL;
1582 g_return_if_fail (this->selection != NULL);
1584 for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1586 SPItem *item = SP_ITEM(i->data);
1587 SPStyle *style = SP_OBJECT_STYLE (item);
1589 if (style && (style->fill.isPaintserver())) {
1590 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER (item);
1591 if (SP_IS_LINEARGRADIENT (server)) {
1592 addDraggersLinear (SP_LINEARGRADIENT (server), item, true);
1593 } else if (SP_IS_RADIALGRADIENT (server)) {
1594 addDraggersRadial (SP_RADIALGRADIENT (server), item, true);
1595 }
1596 }
1598 if (style && (style->stroke.isPaintserver())) {
1599 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER (item);
1600 if (SP_IS_LINEARGRADIENT (server)) {
1601 addDraggersLinear (SP_LINEARGRADIENT (server), item, false);
1602 } else if (SP_IS_RADIALGRADIENT (server)) {
1603 addDraggersRadial (SP_RADIALGRADIENT (server), item, false);
1604 }
1605 }
1606 }
1607 }
1609 /**
1610 Regenerates the lines list from the current selection; is called on each move of a dragger, so that
1611 lines are always in sync with the actual gradient
1612 */
1613 void
1614 GrDrag::updateLines ()
1615 {
1616 // delete old lines
1617 for (GSList const *i = this->lines; i != NULL; i = i->next) {
1618 gtk_object_destroy( GTK_OBJECT (i->data));
1619 }
1620 g_slist_free (this->lines);
1621 this->lines = NULL;
1623 g_return_if_fail (this->selection != NULL);
1625 for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1627 SPItem *item = SP_ITEM(i->data);
1629 SPStyle *style = SP_OBJECT_STYLE (item);
1631 if (style && (style->fill.isPaintserver())) {
1632 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER (item);
1633 if (SP_IS_LINEARGRADIENT (server)) {
1634 this->addLine (item, sp_item_gradient_get_coords (item, POINT_LG_BEGIN, 0, true), sp_item_gradient_get_coords (item, POINT_LG_END, 0, true), GR_LINE_COLOR_FILL);
1635 } else if (SP_IS_RADIALGRADIENT (server)) {
1636 NR::Point center = sp_item_gradient_get_coords (item, POINT_RG_CENTER, 0, true);
1637 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R1, 0, true), GR_LINE_COLOR_FILL);
1638 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R2, 0, true), GR_LINE_COLOR_FILL);
1639 }
1640 }
1642 if (style && (style->stroke.isPaintserver())) {
1643 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER (item);
1644 if (SP_IS_LINEARGRADIENT (server)) {
1645 this->addLine (item, sp_item_gradient_get_coords (item, POINT_LG_BEGIN, 0, false), sp_item_gradient_get_coords (item, POINT_LG_END, 0, false), GR_LINE_COLOR_STROKE);
1646 } else if (SP_IS_RADIALGRADIENT (server)) {
1647 NR::Point center = sp_item_gradient_get_coords (item, POINT_RG_CENTER, 0, false);
1648 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R1, 0, false), GR_LINE_COLOR_STROKE);
1649 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R2, 0, false), GR_LINE_COLOR_STROKE);
1650 }
1651 }
1652 }
1653 }
1655 /**
1656 Regenerates the levels list from the current selection
1657 */
1658 void
1659 GrDrag::updateLevels ()
1660 {
1661 hor_levels.clear();
1662 vert_levels.clear();
1664 g_return_if_fail (this->selection != NULL);
1666 for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1667 SPItem *item = SP_ITEM(i->data);
1668 NR::Maybe<NR::Rect> rect = sp_item_bbox_desktop (item);
1669 if (rect) {
1670 // Remember the edges of the bbox and the center axis
1671 hor_levels.push_back(rect->min()[NR::Y]);
1672 hor_levels.push_back(rect->max()[NR::Y]);
1673 hor_levels.push_back(0.5 * (rect->min()[NR::Y] + rect->max()[NR::Y]));
1674 vert_levels.push_back(rect->min()[NR::X]);
1675 vert_levels.push_back(rect->max()[NR::X]);
1676 vert_levels.push_back(0.5 * (rect->min()[NR::X] + rect->max()[NR::X]));
1677 }
1678 }
1679 }
1681 void
1682 GrDrag::selected_reverse_vector ()
1683 {
1684 if (selected == NULL)
1685 return;
1687 for (GSList const* i = ( (GrDragger*) selected->data )->draggables; i != NULL; i = i->next) {
1688 GrDraggable *draggable = (GrDraggable *) i->data;
1690 sp_item_gradient_reverse_vector (draggable->item, draggable->fill_or_stroke);
1691 }
1692 }
1694 void
1695 GrDrag::selected_move_nowrite (double x, double y, bool scale_radial)
1696 {
1697 selected_move (x, y, false, scale_radial);
1698 }
1700 void
1701 GrDrag::selected_move (double x, double y, bool write_repr, bool scale_radial)
1702 {
1703 if (selected == NULL)
1704 return;
1706 bool did = false;
1708 for (GList *i = selected; i != NULL; i = i->next) {
1709 GrDragger *d = (GrDragger *) i->data;
1711 if (!d->isA(POINT_LG_MID) && !d->isA(POINT_RG_MID1) && !d->isA(POINT_RG_MID2)) {
1712 // if this is an endpoint,
1714 // Moving an rg center moves its focus and radii as well.
1715 // therefore, if this is a focus or radius and if selection
1716 // contains the center as well, do not move this one
1717 if (d->isA(POINT_RG_R1) || d->isA(POINT_RG_R2) ||
1718 (d->isA(POINT_RG_FOCUS) && !d->isA(POINT_RG_CENTER))) {
1719 bool skip_radius_with_center = false;
1720 for (GList *di = selected; di != NULL; di = di->next) {
1721 GrDragger *d_new = (GrDragger *) di->data;
1722 if (d_new->isA (((GrDraggable *) d->draggables->data)->item,
1723 POINT_RG_CENTER,
1724 0,
1725 ((GrDraggable *) d->draggables->data)->fill_or_stroke)) {
1726 // FIXME: here we take into account only the first draggable!
1727 skip_radius_with_center = true;
1728 }
1729 }
1730 if (skip_radius_with_center)
1731 continue;
1732 }
1734 did = true;
1735 d->point += NR::Point (x, y);
1736 d->point_original = d->point;
1737 sp_knot_moveto (d->knot, &(d->point));
1739 d->fireDraggables (write_repr, scale_radial);
1741 d->updateDependencies(write_repr);
1742 }
1743 }
1745 if (write_repr && did) {
1746 // we did an undoable action
1747 sp_document_maybe_done (sp_desktop_document (desktop), "grmoveh", SP_VERB_CONTEXT_GRADIENT,
1748 _("Move gradient handle(s)"));
1749 return;
1750 }
1752 if (!did) { // none of the end draggers are selected, so let's try to move the mids
1754 GrDragger *dragger = (GrDragger *) selected->data;
1755 // a midpoint dragger can (logically) only contain one GrDraggable
1756 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
1758 NR::Point begin(0,0), end(0,0);
1759 NR::Point low_lim(0,0), high_lim(0,0);
1761 SPObject *server = draggable->getServer();
1762 GSList *moving = NULL;
1763 gr_midpoint_limits(dragger, server, &begin, &end, &low_lim, &high_lim, &moving);
1765 NR::Point p(x, y);
1766 p = snap_vector_midpoint (dragger->point + p, low_lim, high_lim, 0);
1767 NR::Point displacement = p - dragger->point;
1769 for (GSList const* i = moving; i != NULL; i = i->next) {
1770 GrDragger *drg = (GrDragger*) i->data;
1771 SPKnot *drgknot = drg->knot;
1772 drg->point += displacement;
1773 sp_knot_moveto (drgknot, & drg->point);
1774 drg->fireDraggables (true);
1775 drg->updateDependencies(true);
1776 did = true;
1777 }
1779 g_slist_free(moving);
1781 if (write_repr && did) {
1782 // we did an undoable action
1783 sp_document_maybe_done (sp_desktop_document (desktop), "grmovem", SP_VERB_CONTEXT_GRADIENT,
1784 _("Move gradient mid stop(s)"));
1785 }
1786 }
1787 }
1789 void
1790 GrDrag::selected_move_screen (double x, double y)
1791 {
1792 gdouble zoom = desktop->current_zoom();
1793 gdouble zx = x / zoom;
1794 gdouble zy = y / zoom;
1796 selected_move (zx, zy);
1797 }
1799 /**
1800 Select the knot next to the last selected one and deselect all other selected.
1801 */
1802 GrDragger *
1803 GrDrag::select_next ()
1804 {
1805 GrDragger *d = NULL;
1806 if (selected == NULL || g_list_find(draggers, selected->data)->next == NULL) {
1807 if (draggers)
1808 d = (GrDragger *) draggers->data;
1809 } else {
1810 d = (GrDragger *) g_list_find(draggers, selected->data)->next->data;
1811 }
1812 if (d)
1813 setSelected (d);
1814 return d;
1815 }
1817 /**
1818 Select the knot previous from the last selected one and deselect all other selected.
1819 */
1820 GrDragger *
1821 GrDrag::select_prev ()
1822 {
1823 GrDragger *d = NULL;
1824 if (selected == NULL || g_list_find(draggers, selected->data)->prev == NULL) {
1825 if (draggers)
1826 d = (GrDragger *) g_list_last (draggers)->data;
1827 } else {
1828 d = (GrDragger *) g_list_find(draggers, selected->data)->prev->data;
1829 }
1830 if (d)
1831 setSelected (d);
1832 return d;
1833 }
1836 // FIXME: i.m.o. an ugly function that I just made to work, but... aargh! (Johan)
1837 void
1838 GrDrag::deleteSelected (bool just_one)
1839 {
1840 if (!selected) return;
1842 SPDocument *document = false;
1844 struct StructStopInfo {
1845 SPStop * spstop;
1846 GrDraggable * draggable;
1847 SPGradient * gradient;
1848 SPGradient * vector;
1849 };
1851 GSList *midstoplist = NULL; // list of stops that must be deleted (will be deleted first)
1852 GSList *endstoplist = NULL; // list of stops that must be deleted
1853 while (selected) {
1854 GrDragger *dragger = (GrDragger*) selected->data;
1855 for (GSList * drgble = dragger->draggables; drgble != NULL; drgble = drgble->next) {
1856 GrDraggable *draggable = (GrDraggable*) drgble->data;
1857 SPGradient *gradient = sp_item_gradient (draggable->item, draggable->fill_or_stroke);
1858 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (gradient, false);
1860 switch (draggable->point_type) {
1861 case POINT_LG_MID:
1862 case POINT_RG_MID1:
1863 case POINT_RG_MID2:
1864 {
1865 SPStop *stop = sp_get_stop_i(vector, draggable->point_i);
1866 // check if already present in list. (e.g. when both RG_MID1 and RG_MID2 were selected)
1867 bool present = false;
1868 for (GSList const * l = midstoplist; l != NULL; l = l->next) {
1869 if ( (SPStop*)l->data == stop ) {
1870 present = true;
1871 break; // no need to search further.
1872 }
1873 }
1874 if (!present)
1875 midstoplist = g_slist_append(midstoplist, stop);
1876 }
1877 break;
1878 case POINT_LG_BEGIN:
1879 case POINT_LG_END:
1880 case POINT_RG_CENTER:
1881 case POINT_RG_R1:
1882 case POINT_RG_R2:
1883 {
1884 SPStop *stop = NULL;
1885 if ( (draggable->point_type == POINT_LG_BEGIN) || (draggable->point_type == POINT_RG_CENTER) ) {
1886 stop = sp_first_stop(vector);
1887 } else {
1888 stop = sp_last_stop(vector);
1889 }
1890 if (stop) {
1891 StructStopInfo *stopinfo = new StructStopInfo;
1892 stopinfo->spstop = stop;
1893 stopinfo->draggable = draggable;
1894 stopinfo->gradient = gradient;
1895 stopinfo->vector = vector;
1896 // check if already present in list. (e.g. when both R1 and R2 were selected)
1897 bool present = false;
1898 for (GSList const * l = endstoplist; l != NULL; l = l->next) {
1899 if ( ((StructStopInfo*)l->data)->spstop == stopinfo->spstop ) {
1900 present = true;
1901 break; // no need to search further.
1902 }
1903 }
1904 if (!present)
1905 endstoplist = g_slist_append(endstoplist, stopinfo);
1906 }
1907 }
1908 break;
1909 default:
1910 break;
1911 }
1912 }
1913 selected = g_list_remove(selected, dragger);
1914 if ( just_one ) break; // iterate once if just_one is set.
1915 }
1916 while (midstoplist) {
1917 SPStop *stop = (SPStop*) midstoplist->data;
1918 document = SP_OBJECT_DOCUMENT (stop);
1919 Inkscape::XML::Node * parent = SP_OBJECT_REPR(stop)->parent();
1920 parent->removeChild(SP_OBJECT_REPR(stop));
1921 midstoplist = g_slist_remove(midstoplist, stop);
1922 }
1923 while (endstoplist) {
1924 StructStopInfo *stopinfo = (StructStopInfo*) endstoplist->data;
1925 document = SP_OBJECT_DOCUMENT (stopinfo->spstop);
1927 // 2 is the minimum, cannot delete more than that without deleting the whole vector
1928 // cannot use vector->vector.stops.size() because the vector might be invalidated by deletion of a midstop
1929 // manually count the children, don't know if there already exists a function for this...
1930 int len = 0;
1931 for ( SPObject *child = sp_object_first_child(stopinfo->vector) ;
1932 child != NULL ;
1933 child = SP_OBJECT_NEXT(child) )
1934 {
1935 if ( SP_IS_STOP(child) ) len ++;
1936 }
1937 if (len > 2)
1938 {
1939 switch (stopinfo->draggable->point_type) {
1940 case POINT_LG_BEGIN:
1941 {
1942 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1944 SPLinearGradient *lg = SP_LINEARGRADIENT(stopinfo->gradient);
1945 NR::Point oldbegin = NR::Point (lg->x1.computed, lg->y1.computed);
1946 NR::Point end = NR::Point (lg->x2.computed, lg->y2.computed);
1947 SPStop *stop = sp_first_stop(stopinfo->vector);
1948 gdouble offset = stop->offset;
1949 NR::Point newbegin = oldbegin + offset * (end - oldbegin);
1950 lg->x1.computed = newbegin[NR::X];
1951 lg->y1.computed = newbegin[NR::Y];
1953 Inkscape::XML::Node *repr = SP_OBJECT_REPR(stopinfo->gradient);
1954 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
1955 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
1956 stop->offset = 0;
1957 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", 0);
1959 // iterate through midstops to set new offset values such that they won't move on canvas.
1960 SPStop *laststop = sp_last_stop(stopinfo->vector);
1961 stop = sp_next_stop(stop);
1962 while ( stop != laststop ) {
1963 stop->offset = (stop->offset - offset)/(1 - offset);
1964 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
1965 stop = sp_next_stop(stop);
1966 }
1967 }
1968 break;
1969 case POINT_LG_END:
1970 {
1971 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1973 SPLinearGradient *lg = SP_LINEARGRADIENT(stopinfo->gradient);
1974 NR::Point begin = NR::Point (lg->x1.computed, lg->y1.computed);
1975 NR::Point oldend = NR::Point (lg->x2.computed, lg->y2.computed);
1976 SPStop *laststop = sp_last_stop(stopinfo->vector);
1977 gdouble offset = laststop->offset;
1978 NR::Point newend = begin + offset * (oldend - begin);
1979 lg->x2.computed = newend[NR::X];
1980 lg->y2.computed = newend[NR::Y];
1982 Inkscape::XML::Node *repr = SP_OBJECT_REPR(stopinfo->gradient);
1983 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
1984 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
1985 laststop->offset = 1;
1986 sp_repr_set_css_double (SP_OBJECT_REPR (laststop), "offset", 1);
1988 // iterate through midstops to set new offset values such that they won't move on canvas.
1989 SPStop *stop = sp_first_stop(stopinfo->vector);
1990 stop = sp_next_stop(stop);
1991 while ( stop != laststop ) {
1992 stop->offset = stop->offset / offset;
1993 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
1994 stop = sp_next_stop(stop);
1995 }
1996 }
1997 break;
1998 case POINT_RG_CENTER:
1999 {
2000 SPStop *newfirst = sp_next_stop (stopinfo->spstop);
2001 if (newfirst) {
2002 newfirst->offset = 0;
2003 sp_repr_set_css_double (SP_OBJECT_REPR (newfirst), "offset", 0);
2004 }
2005 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
2006 }
2007 break;
2008 case POINT_RG_R1:
2009 case POINT_RG_R2:
2010 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
2012 SPRadialGradient *rg = SP_RADIALGRADIENT(stopinfo->gradient);
2013 double oldradius = rg->r.computed;
2014 SPStop *laststop = sp_last_stop(stopinfo->vector);
2015 gdouble offset = laststop->offset;
2016 double newradius = offset * oldradius;
2017 rg->r.computed = newradius;
2019 Inkscape::XML::Node *repr = SP_OBJECT_REPR(rg);
2020 sp_repr_set_svg_double(repr, "r", rg->r.computed);
2021 laststop->offset = 1;
2022 sp_repr_set_css_double (SP_OBJECT_REPR (laststop), "offset", 1);
2024 // iterate through midstops to set new offset values such that they won't move on canvas.
2025 SPStop *stop = sp_first_stop(stopinfo->vector);
2026 stop = sp_next_stop(stop);
2027 while ( stop != laststop ) {
2028 stop->offset = stop->offset / offset;
2029 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
2030 stop = sp_next_stop(stop);
2031 }
2032 break;
2033 }
2034 }
2035 else
2036 { // delete the gradient from the object. set fill to unset FIXME: set to fill of unselected node?
2037 SPCSSAttr *css = sp_repr_css_attr_new ();
2039 // stopinfo->spstop is the selected stop
2040 Inkscape::XML::Node *unselectedrepr = SP_OBJECT_REPR(stopinfo->vector)->firstChild();
2041 if (unselectedrepr == SP_OBJECT_REPR(stopinfo->spstop) ) {
2042 unselectedrepr = unselectedrepr->next();
2043 }
2045 if (unselectedrepr == NULL) {
2046 if (stopinfo->draggable->fill_or_stroke) {
2047 sp_repr_css_unset_property (css, "fill");
2048 } else {
2049 sp_repr_css_unset_property (css, "stroke");
2050 }
2051 } else {
2052 SPCSSAttr *stopcss = sp_repr_css_attr(unselectedrepr, "style");
2053 if (stopinfo->draggable->fill_or_stroke) {
2054 sp_repr_css_set_property(css, "fill", sp_repr_css_property(stopcss, "stop-color", "inkscape:unset"));
2055 sp_repr_css_set_property(css, "fill-opacity", sp_repr_css_property(stopcss, "stop-opacity", "1"));
2056 } else {
2057 sp_repr_css_set_property(css, "stroke", sp_repr_css_property(stopcss, "stop-color", "inkscape:unset"));
2058 sp_repr_css_set_property(css, "stroke-opacity", sp_repr_css_property(stopcss, "stop-opacity", "1"));
2059 }
2060 sp_repr_css_attr_unref (stopcss);
2061 }
2063 sp_repr_css_change (SP_OBJECT_REPR (stopinfo->draggable->item), css, "style");
2064 sp_repr_css_attr_unref (css);
2065 }
2067 endstoplist = g_slist_remove(endstoplist, stopinfo);
2068 delete stopinfo;
2069 }
2071 if (document) {
2072 sp_document_done ( document, SP_VERB_CONTEXT_GRADIENT, _("Delete gradient stop(s)") );
2073 }
2074 }
2077 /*
2078 Local Variables:
2079 mode:c++
2080 c-file-style:"stroustrup"
2081 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
2082 indent-tabs-mode:nil
2083 fill-column:99
2084 End:
2085 */
2086 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :