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"
34 #include "prefs-utils.h"
35 #include "sp-item.h"
36 #include "style.h"
37 #include "knot.h"
38 #include "sp-linear-gradient.h"
39 #include "sp-radial-gradient.h"
40 #include "gradient-chemistry.h"
41 #include "gradient-drag.h"
42 #include "sp-stop.h"
44 #define GR_KNOT_COLOR_NORMAL 0xffffff00
45 #define GR_KNOT_COLOR_SELECTED 0x0000ff00
47 #define GR_LINE_COLOR_FILL 0x0000ff7f
48 #define GR_LINE_COLOR_STROKE 0x9999007f
50 // screen pixels between knots when they snap:
51 #define SNAP_DIST 5
53 // absolute distance between gradient points for them to become a single dragger when the drag is created:
54 #define MERGE_DIST 0.1
56 // knot shapes corresponding to GrPointType enum
57 SPKnotShapeType gr_knot_shapes [] = {
58 SP_KNOT_SHAPE_SQUARE, //POINT_LG_BEGIN
59 SP_KNOT_SHAPE_CIRCLE, //POINT_LG_END
60 SP_KNOT_SHAPE_DIAMOND, //POINT_LG_MID
61 SP_KNOT_SHAPE_SQUARE, // POINT_RG_CENTER
62 SP_KNOT_SHAPE_CIRCLE, // POINT_RG_R1
63 SP_KNOT_SHAPE_CIRCLE, // POINT_RG_R2
64 SP_KNOT_SHAPE_CROSS, // POINT_RG_FOCUS
65 SP_KNOT_SHAPE_DIAMOND, //POINT_RG_MID1
66 SP_KNOT_SHAPE_DIAMOND //POINT_RG_MID2
67 };
69 const gchar *gr_knot_descr [] = {
70 N_("Linear gradient <b>start</b>"), //POINT_LG_BEGIN
71 N_("Linear gradient <b>end</b>"),
72 N_("Linear gradient <b>midstop</b>"),
73 N_("Radial gradient <b>center</b>"),
74 N_("Radial gradient <b>radius</b>"),
75 N_("Radial gradient <b>radius</b>"),
76 N_("Radial gradient <b>focus</b>"), // POINT_RG_FOCUS
77 N_("Linear gradient <b>midstop</b>"),
78 N_("Linear gradient <b>midstop</b>")
79 };
81 static void
82 gr_drag_sel_changed(Inkscape::Selection *selection, gpointer data)
83 {
84 GrDrag *drag = (GrDrag *) data;
85 drag->updateDraggers ();
86 drag->updateLines ();
87 drag->updateLevels ();
88 }
90 static void
91 gr_drag_sel_modified (Inkscape::Selection *selection, guint flags, gpointer data)
92 {
93 GrDrag *drag = (GrDrag *) data;
94 if (drag->local_change) {
95 drag->local_change = false;
96 } else {
97 drag->updateDraggers ();
98 }
99 drag->updateLines ();
100 drag->updateLevels ();
101 }
103 /**
104 When a _query_style_signal is received, check that \a property requests fill/stroke/opacity (otherwise
105 skip), and fill the \a style with the averaged color of all draggables of the selected dragger, if
106 any.
107 */
108 int
109 gr_drag_style_query (SPStyle *style, int property, gpointer data)
110 {
111 GrDrag *drag = (GrDrag *) data;
113 if (property != QUERY_STYLE_PROPERTY_FILL && property != QUERY_STYLE_PROPERTY_STROKE && property != QUERY_STYLE_PROPERTY_MASTEROPACITY) {
114 return QUERY_STYLE_NOTHING;
115 }
117 if (!drag->selected) {
118 return QUERY_STYLE_NOTHING;
119 } else {
120 int ret = QUERY_STYLE_NOTHING;
122 float cf[4];
123 cf[0] = cf[1] = cf[2] = cf[3] = 0;
125 int count = 0;
127 for (GSList const* i = ((GrDragger*)drag->selected->data)->draggables; i != NULL; i = i->next) { // for all draggables of dragger
128 GrDraggable *draggable = (GrDraggable *) i->data;
130 if (ret == QUERY_STYLE_NOTHING) {
131 ret = QUERY_STYLE_SINGLE;
132 } else if (ret == QUERY_STYLE_SINGLE) {
133 ret = QUERY_STYLE_MULTIPLE_AVERAGED;
134 }
136 guint32 c = sp_item_gradient_stop_query_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
137 cf[0] += SP_RGBA32_R_F (c);
138 cf[1] += SP_RGBA32_G_F (c);
139 cf[2] += SP_RGBA32_B_F (c);
140 cf[3] += SP_RGBA32_A_F (c);
142 count ++;
143 }
145 if (count) {
146 cf[0] /= count;
147 cf[1] /= count;
148 cf[2] /= count;
149 cf[3] /= count;
151 // set both fill and stroke with our stop-color and stop-opacity
152 sp_color_set_rgb_float((SPColor *) &style->fill.value.color, cf[0], cf[1], cf[2]);
153 style->fill.set = TRUE;
154 style->fill.type = SP_PAINT_TYPE_COLOR;
155 sp_color_set_rgb_float((SPColor *) &style->stroke.value.color, cf[0], cf[1], cf[2]);
156 style->stroke.set = TRUE;
157 style->stroke.type = SP_PAINT_TYPE_COLOR;
159 style->fill_opacity.value = SP_SCALE24_FROM_FLOAT (1.0);
160 style->fill_opacity.set = TRUE;
161 style->stroke_opacity.value = SP_SCALE24_FROM_FLOAT (1.0);
162 style->stroke_opacity.set = TRUE;
164 style->opacity.value = SP_SCALE24_FROM_FLOAT (cf[3]);
165 style->opacity.set = TRUE;
166 }
168 return ret;
169 }
170 }
172 bool
173 gr_drag_style_set (const SPCSSAttr *css, gpointer data)
174 {
175 GrDrag *drag = (GrDrag *) data;
177 if (!drag->selected)
178 return false;
180 SPCSSAttr *stop = sp_repr_css_attr_new ();
182 // See if the css contains interesting properties, and if so, translate them into the format
183 // acceptable for gradient stops
185 // any of color properties, in order of increasing priority:
186 if (css->attribute("flood-color"))
187 sp_repr_css_set_property (stop, "stop-color", css->attribute("flood-color"));
189 if (css->attribute("lighting-color"))
190 sp_repr_css_set_property (stop, "stop-color", css->attribute("lighting-color"));
192 if (css->attribute("color"))
193 sp_repr_css_set_property (stop, "stop-color", css->attribute("color"));
195 if (css->attribute("stroke") && strcmp(css->attribute("stroke"), "none"))
196 sp_repr_css_set_property (stop, "stop-color", css->attribute("stroke"));
198 if (css->attribute("fill") && strcmp(css->attribute("fill"), "none"))
199 sp_repr_css_set_property (stop, "stop-color", css->attribute("fill"));
201 if (css->attribute("stop-color"))
202 sp_repr_css_set_property (stop, "stop-color", css->attribute("stop-color"));
205 if (css->attribute("stop-opacity")) { // direct setting of stop-opacity has priority
206 sp_repr_css_set_property (stop, "stop-opacity", css->attribute("stop-opacity"));
207 } else { // multiply all opacity properties:
208 gdouble accumulated = 1.0;
209 accumulated *= sp_svg_read_percentage(css->attribute("flood-opacity"), 1.0);
210 accumulated *= sp_svg_read_percentage(css->attribute("opacity"), 1.0);
211 accumulated *= sp_svg_read_percentage(css->attribute("stroke-opacity"), 1.0);
212 accumulated *= sp_svg_read_percentage(css->attribute("fill-opacity"), 1.0);
214 Inkscape::CSSOStringStream os;
215 os << accumulated;
216 sp_repr_css_set_property (stop, "stop-opacity", os.str().c_str());
218 if ((css->attribute("fill") && !strcmp(css->attribute("fill"), "none")) ||
219 (css->attribute("stroke") && !strcmp(css->attribute("stroke"), "none")))
220 sp_repr_css_set_property (stop, "stop-opacity", "0"); // if set to none, don't change color, set opacity to 0
221 }
223 if (!stop->attributeList()) { // nothing for us here, pass it on
224 sp_repr_css_attr_unref(stop);
225 return false;
226 }
228 for (GList const* sel = drag->selected; sel != NULL; sel = sel->next) { // for all selected draggers
229 GrDragger* dragger = (GrDragger*) sel->data;
230 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) { // for all draggables of dragger
231 GrDraggable *draggable = (GrDraggable *) i->data;
233 drag->local_change = true;
234 sp_item_gradient_stop_set_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke, stop);
235 }
236 }
238 //sp_repr_css_print(stop);
239 sp_repr_css_attr_unref(stop);
240 return true;
241 }
243 GrDrag::GrDrag(SPDesktop *desktop) {
245 this->desktop = desktop;
247 this->selection = sp_desktop_selection(desktop);
249 this->draggers = NULL;
250 this->lines = NULL;
251 this->selected = NULL;
253 this->hor_levels.clear();
254 this->vert_levels.clear();
256 this->local_change = false;
258 this->sel_changed_connection = this->selection->connectChanged(
259 sigc::bind (
260 sigc::ptr_fun(&gr_drag_sel_changed),
261 (gpointer)this )
263 );
264 this->sel_modified_connection = this->selection->connectModified(
265 sigc::bind(
266 sigc::ptr_fun(&gr_drag_sel_modified),
267 (gpointer)this )
268 );
270 this->style_set_connection = this->desktop->connectSetStyle(
271 sigc::bind(
272 sigc::ptr_fun(&gr_drag_style_set),
273 (gpointer)this )
274 );
276 this->style_query_connection = this->desktop->connectQueryStyle(
277 sigc::bind(
278 sigc::ptr_fun(&gr_drag_style_query),
279 (gpointer)this )
280 );
282 this->updateDraggers ();
283 this->updateLines ();
284 this->updateLevels ();
286 if (desktop->gr_item) {
287 this->setSelected (getDraggerFor (desktop->gr_item, desktop->gr_point_type, desktop->gr_point_i, desktop->gr_fill_or_stroke));
288 }
289 }
291 GrDrag::~GrDrag()
292 {
293 this->sel_changed_connection.disconnect();
294 this->sel_modified_connection.disconnect();
295 this->style_set_connection.disconnect();
296 this->style_query_connection.disconnect();
298 if (this->selected) {
299 GrDraggable *draggable = (GrDraggable *) ((GrDragger*)this->selected->data)->draggables->data;
300 desktop->gr_item = draggable->item;
301 desktop->gr_point_type = draggable->point_type;
302 desktop->gr_point_i = draggable->point_i;
303 desktop->gr_fill_or_stroke = draggable->fill_or_stroke;
304 } else {
305 desktop->gr_item = NULL;
306 desktop->gr_point_type = 0;
307 desktop->gr_point_i = 0;
308 desktop->gr_fill_or_stroke = true;
309 }
311 deselect_all();
312 for (GList *l = this->draggers; l != NULL; l = l->next) {
313 delete ((GrDragger *) l->data);
314 }
315 g_list_free (this->draggers);
316 this->draggers = NULL;
317 this->selected = NULL;
319 for (GSList *l = this->lines; l != NULL; l = l->next) {
320 gtk_object_destroy( GTK_OBJECT (l->data));
321 }
322 g_slist_free (this->lines);
323 this->lines = NULL;
324 }
326 GrDraggable::GrDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
327 {
328 this->item = item;
329 this->point_type = point_type;
330 this->point_i = point_i;
331 this->fill_or_stroke = fill_or_stroke;
333 g_object_ref (G_OBJECT (this->item));
334 }
336 GrDraggable::~GrDraggable ()
337 {
338 g_object_unref (G_OBJECT (this->item));
339 }
341 // FIXME: make global function in libnr or somewhere.
342 static NR::Point *
343 get_snap_vector (NR::Point p, NR::Point o, double snap, double initial)
344 {
345 double r = NR::L2 (p - o);
346 if (r < 1e-3)
347 return NULL;
348 double angle = NR::atan2 (p - o);
349 // snap angle to snaps increments, starting from initial:
350 double a_snapped = initial + floor((angle - initial)/snap + 0.5) * snap;
351 // calculate the new position and subtract p to get the vector:
352 return new NR::Point (o + r * NR::Point(cos(a_snapped), sin(a_snapped)) - p);
353 }
355 // FIXME: make global function in libnr or somewhere.
356 static NR::Point
357 snap_vector_midpoint (NR::Point p, NR::Point begin, NR::Point end, double snap)
358 {
359 double length = NR::L2(end - begin);
360 NR::Point be = (end - begin) / length;
361 double r = NR::dot(p - begin, be);
363 if (r < 0.0) return begin;
364 if (r > length) return end;
366 double snapdist = length * snap;
367 double r_snapped = (snap==0) ? r : floor(r/(snapdist + 0.5)) * snapdist;
369 return (begin + r_snapped * be);
370 }
372 static void
373 gr_knot_moved_handler(SPKnot *knot, NR::Point const *ppointer, guint state, gpointer data)
374 {
375 GrDragger *dragger = (GrDragger *) data;
376 GrDrag *drag = dragger->parent;
378 NR::Point p = *ppointer;
380 // FIXME: take from prefs
381 double snap_dist = SNAP_DIST / dragger->parent->desktop->current_zoom();
383 if (state & GDK_SHIFT_MASK) {
384 // with Shift; unsnap if we carry more than one draggable
385 if (dragger->draggables && dragger->draggables->next) {
386 // create a new dragger
387 GrDragger *dr_new = new GrDragger (dragger->parent, dragger->point, NULL);
388 dragger->parent->draggers = g_list_prepend (dragger->parent->draggers, dr_new);
389 // relink to it all but the first draggable in the list
390 for (GSList const* i = dragger->draggables->next; i != NULL; i = i->next) {
391 GrDraggable *draggable = (GrDraggable *) i->data;
392 dr_new->addDraggable (draggable);
393 }
394 dr_new->updateKnotShape();
395 g_slist_free (dragger->draggables->next);
396 dragger->draggables->next = NULL;
397 dragger->updateKnotShape();
398 dragger->updateTip();
399 }
400 } else if (!(state & GDK_CONTROL_MASK)) {
401 // without Shift or Ctrl; see if we need to snap to another dragger
402 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
403 GrDragger *d_new = (GrDragger *) di->data;
404 if (dragger->mayMerge(d_new) && NR::L2 (d_new->point - p) < snap_dist) {
406 // Merge draggers:
407 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) { // for all draggables of dragger
408 GrDraggable *draggable = (GrDraggable *) i->data;
409 // copy draggable to d_new:
410 GrDraggable *da_new = new GrDraggable (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
411 d_new->addDraggable (da_new);
412 }
414 // unlink and delete this dragger
415 dragger->parent->draggers = g_list_remove (dragger->parent->draggers, dragger);
416 delete dragger;
418 // update the new merged dragger
419 d_new->fireDraggables(true, false, true);
420 d_new->parent->updateLines();
421 d_new->parent->setSelected (d_new);
422 d_new->updateKnotShape ();
423 d_new->updateTip ();
424 d_new->updateDependencies(true);
425 sp_document_done (sp_desktop_document (d_new->parent->desktop), SP_VERB_CONTEXT_GRADIENT,
426 _("Merge gradient handles"));
427 return;
428 }
429 }
430 }
433 if (!((state & GDK_SHIFT_MASK) || ((state & GDK_CONTROL_MASK) && (state & GDK_MOD1_MASK)))) {
434 // See if we need to snap to any of the levels
435 for (guint i = 0; i < dragger->parent->hor_levels.size(); i++) {
436 if (fabs(p[NR::Y] - dragger->parent->hor_levels[i]) < snap_dist) {
437 p[NR::Y] = dragger->parent->hor_levels[i];
438 sp_knot_moveto (knot, &p);
439 }
440 }
441 for (guint i = 0; i < dragger->parent->vert_levels.size(); i++) {
442 if (fabs(p[NR::X] - dragger->parent->vert_levels[i]) < snap_dist) {
443 p[NR::X] = dragger->parent->vert_levels[i];
444 sp_knot_moveto (knot, &p);
445 }
446 }
447 }
449 if (state & GDK_CONTROL_MASK) {
450 unsigned snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
451 /* 0 means no snapping. */
453 // This list will store snap vectors from all draggables of dragger
454 GSList *snap_vectors = NULL;
456 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) {
457 GrDraggable *draggable = (GrDraggable *) i->data;
459 NR::Point *dr_snap = NULL;
461 if (draggable->point_type == POINT_LG_BEGIN || draggable->point_type == POINT_LG_END) {
462 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
463 GrDragger *d_new = (GrDragger *) di->data;
464 if (d_new == dragger)
465 continue;
466 if (d_new->isA (draggable->item,
467 draggable->point_type == POINT_LG_BEGIN? POINT_LG_END : POINT_LG_BEGIN,
468 draggable->point_i,
469 draggable->fill_or_stroke)) {
470 // found the other end of the linear gradient;
471 if (state & GDK_SHIFT_MASK) {
472 // moving linear around center
473 NR::Point center = NR::Point (0.5*(d_new->point + dragger->point));
474 dr_snap = ¢er;
475 } else {
476 // moving linear around the other end
477 dr_snap = &d_new->point;
478 }
479 }
480 }
481 } else if (draggable->point_type == POINT_RG_R1 || draggable->point_type == POINT_RG_R2 || draggable->point_type == POINT_RG_FOCUS) {
482 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
483 GrDragger *d_new = (GrDragger *) di->data;
484 if (d_new == dragger)
485 continue;
486 if (d_new->isA (draggable->item,
487 POINT_RG_CENTER,
488 draggable->point_i,
489 draggable->fill_or_stroke)) {
490 // found the center of the radial gradient;
491 dr_snap = &(d_new->point);
492 }
493 }
494 } else if (draggable->point_type == POINT_RG_CENTER) {
495 // radial center snaps to hor/vert relative to its original position
496 dr_snap = &(dragger->point_original);
497 }
499 NR::Point *snap_vector = NULL;
500 if (dr_snap) {
501 if (state & GDK_MOD1_MASK) {
502 // with Alt, snap to the original angle and its perpendiculars
503 snap_vector = get_snap_vector (p, *dr_snap, M_PI/2, NR::atan2 (dragger->point_original - *dr_snap));
504 } else {
505 // with Ctrl, snap to M_PI/snaps
506 snap_vector = get_snap_vector (p, *dr_snap, M_PI/snaps, 0);
507 }
508 }
509 if (snap_vector) {
510 snap_vectors = g_slist_prepend (snap_vectors, snap_vector);
511 }
512 }
514 // Move by the smallest of snap vectors:
515 NR::Point move(9999, 9999);
516 for (GSList const *i = snap_vectors; i != NULL; i = i->next) {
517 NR::Point *snap_vector = (NR::Point *) i->data;
518 if (NR::L2(*snap_vector) < NR::L2(move))
519 move = *snap_vector;
520 }
521 if (move[NR::X] < 9999) {
522 p += move;
523 sp_knot_moveto (knot, &p);
524 }
526 g_slist_free(snap_vectors);
527 }
529 dragger->point = p;
531 if ((state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK)) {
532 dragger->fireDraggables (false, true);
533 } else {
534 dragger->fireDraggables (false);
535 }
537 dragger->updateDependencies(false);
539 drag->keep_selection = (bool) g_list_find(drag->selected, dragger);
540 }
543 /**
544 Called when a midpoint knot is dragged.
545 */
546 static void
547 gr_knot_moved_midpoint_handler(SPKnot *knot, NR::Point const *ppointer, guint state, gpointer data)
548 {
549 GrDragger *dragger = (GrDragger *) data;
550 GrDrag *drag = dragger->parent;
551 // a midpoint dragger can (logically) only contain one GrDraggable
552 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
554 // FIXME: take from prefs
555 double snap_fraction = 0.1;
557 NR::Point p = *ppointer;
558 NR::Point begin(0,0), end(0,0);
560 SPObject *server;
561 if (draggable->fill_or_stroke)
562 server = SP_OBJECT_STYLE_FILL_SERVER (draggable->item);
563 else
564 server = SP_OBJECT_STYLE_STROKE_SERVER (draggable->item);
567 // get begin and end points between which dragging is allowed:
568 // the draglimits are between knot(lowest_i - 1) and knot(highest_i + 1)
569 GSList *moving = NULL;
570 moving = g_slist_append(moving, dragger);
572 guint lowest_i = draggable->point_i;
573 guint highest_i = draggable->point_i;
574 GrDragger *lowest_dragger = dragger;
575 GrDragger *highest_dragger = dragger;
576 bool is_selected = g_list_find(drag->selected, dragger);
577 if (is_selected) {
578 GrDragger* d_add;
579 while ( true )
580 {
581 d_add = drag->getDraggerFor(draggable->item, draggable->point_type, lowest_i - 1, draggable->fill_or_stroke);
582 if ( d_add && g_list_find(drag->selected, d_add) ) {
583 lowest_i = lowest_i - 1;
584 moving = g_slist_prepend(moving, d_add);
585 lowest_dragger = d_add;
586 } else {
587 break;
588 }
589 }
591 while ( true )
592 {
593 d_add = drag->getDraggerFor(draggable->item, draggable->point_type, highest_i + 1, draggable->fill_or_stroke);
594 if ( d_add && g_list_find(drag->selected, d_add) ) {
595 highest_i = highest_i + 1;
596 moving = g_slist_append(moving, d_add);
597 highest_dragger = d_add;
598 } else {
599 break;
600 }
601 }
602 }
604 if ( SP_IS_LINEARGRADIENT(server) ) {
605 GrDragger *d_temp;
606 if (lowest_i == 1) {
607 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_BEGIN, 0, draggable->fill_or_stroke);
608 } else {
609 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_MID, lowest_i - 1, draggable->fill_or_stroke);
610 }
611 if (d_temp) begin = d_temp->point;
613 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_MID, highest_i + 1, draggable->fill_or_stroke);
614 if (d_temp == NULL) {
615 d_temp = drag->getDraggerFor (draggable->item, POINT_LG_END, 0, draggable->fill_or_stroke);
616 }
617 if (d_temp) end = d_temp->point;
618 } else if ( SP_IS_RADIALGRADIENT(server) ) {
619 GrDragger *d_temp;
620 if (lowest_i == 1) {
621 d_temp = drag->getDraggerFor (draggable->item, POINT_RG_CENTER, 0, draggable->fill_or_stroke);
622 } else {
623 d_temp = drag->getDraggerFor (draggable->item, draggable->point_type, lowest_i - 1, draggable->fill_or_stroke);
624 }
625 if (d_temp) begin = d_temp->point;
627 d_temp = drag->getDraggerFor (draggable->item, draggable->point_type, highest_i + 1, draggable->fill_or_stroke);
628 if (d_temp == NULL) {
629 d_temp = drag->getDraggerFor (draggable->item, (draggable->point_type==POINT_RG_MID1) ? POINT_RG_R1 : POINT_RG_R2, 0, draggable->fill_or_stroke);
630 }
631 if (d_temp) end = d_temp->point;
632 }
634 NR::Point low_lim = dragger->point - (lowest_dragger->point - begin);
635 NR::Point high_lim = dragger->point - (highest_dragger->point - end);
637 if (state & GDK_CONTROL_MASK) {
638 p = snap_vector_midpoint (p, low_lim, high_lim, snap_fraction);
639 } else {
640 p = snap_vector_midpoint (p, low_lim, high_lim, 0);
641 }
642 NR::Point displacement = p - dragger->point;
644 for (GSList const* i = moving; i != NULL; i = i->next) {
645 GrDragger *drg = (GrDragger*) i->data;
646 SPKnot *drgknot = drg->knot;
647 drg->point += displacement;
648 sp_knot_moveto (drgknot, & drg->point);
649 drg->fireDraggables (false);
650 drg->updateDependencies(false);
651 }
653 drag->keep_selection = is_selected;
654 }
658 static void
659 gr_knot_grabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
660 {
661 GrDragger *dragger = (GrDragger *) data;
663 sp_canvas_force_full_redraw_after_interruptions(dragger->parent->desktop->canvas, 5);
664 }
666 /**
667 Called when the mouse releases a dragger knot; changes gradient writing to repr, updates other draggers if needed
668 */
669 static void
670 gr_knot_ungrabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
671 {
672 GrDragger *dragger = (GrDragger *) data;
674 sp_canvas_end_forced_full_redraws(dragger->parent->desktop->canvas);
676 dragger->point_original = dragger->point = knot->pos;
678 if ((state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK)) {
679 dragger->fireDraggables (true, true);
680 } else {
681 dragger->fireDraggables (true);
682 }
684 // make this dragger selected
685 if (!dragger->parent->keep_selection) {
686 dragger->parent->setSelected (dragger);
687 }
688 dragger->parent->keep_selection = false;
690 dragger->updateDependencies(true);
692 // we did an undoable action
693 sp_document_done (sp_desktop_document (dragger->parent->desktop), SP_VERB_CONTEXT_GRADIENT,
694 _("Move gradient handle"));
695 }
697 /**
698 Called when a dragger knot is clicked; selects the dragger or deletes it depending on the
699 state of the keyboard keys
700 */
701 static void
702 gr_knot_clicked_handler(SPKnot *knot, guint state, gpointer data)
703 {
704 GrDragger *dragger = (GrDragger *) data;
705 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
706 if (!draggable) return;
708 if ( (state & GDK_CONTROL_MASK) && (state & GDK_MOD1_MASK ) ) {
709 // delete this knot from vector
710 SPGradient *gradient = sp_item_gradient (draggable->item, draggable->fill_or_stroke);
711 gradient = sp_gradient_get_vector (gradient, false);
712 if (gradient->vector.stops.size() > 2) { // 2 is the minimum
713 SPStop *stop = NULL;
714 switch (draggable->point_type) { // if we delete first or last stop, move the next/previous to the edge
715 case POINT_LG_BEGIN:
716 case POINT_RG_CENTER:
717 stop = sp_first_stop(gradient);
718 {
719 SPStop *next = sp_next_stop (stop);
720 if (next) {
721 next->offset = 0;
722 sp_repr_set_css_double (SP_OBJECT_REPR (next), "offset", 0);
723 }
724 }
725 break;
726 case POINT_LG_END:
727 case POINT_RG_R1:
728 case POINT_RG_R2:
729 stop = sp_last_stop(gradient);
730 {
731 SPStop *prev = sp_prev_stop (stop, gradient);
732 if (prev) {
733 prev->offset = 1;
734 sp_repr_set_css_double (SP_OBJECT_REPR (prev), "offset", 1);
735 }
736 }
737 break;
738 case POINT_LG_MID:
739 case POINT_RG_MID1:
740 case POINT_RG_MID2:
741 stop = sp_get_stop_i(gradient, draggable->point_i);
742 break;
743 }
745 SP_OBJECT_REPR(gradient)->removeChild(SP_OBJECT_REPR(stop));
746 sp_document_done (SP_OBJECT_DOCUMENT (gradient), SP_VERB_CONTEXT_GRADIENT,
747 _("Delete gradient stop"));
748 }
749 } else {
750 // select the dragger
751 dragger->point_original = dragger->point;
753 if ( state & GDK_SHIFT_MASK ) {
754 dragger->parent->setSelected (dragger, true, false);
755 } else {
756 dragger->parent->setSelected (dragger);
757 }
758 }
759 }
761 /**
762 Called when a dragger knot is doubleclicked; opens gradient editor with the stop from the first draggable
763 */
764 static void
765 gr_knot_doubleclicked_handler (SPKnot *knot, guint state, gpointer data)
766 {
767 GrDragger *dragger = (GrDragger *) data;
769 dragger->point_original = dragger->point;
771 if (dragger->draggables == NULL)
772 return;
774 GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
775 sp_item_gradient_edit_stop (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
776 }
778 /**
779 Act upon all draggables of the dragger, setting them to the dragger's point
780 */
781 void
782 GrDragger::fireDraggables (bool write_repr, bool scale_radial, bool merging_focus)
783 {
784 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
785 GrDraggable *draggable = (GrDraggable *) i->data;
787 // set local_change flag so that selection_changed callback does not regenerate draggers
788 this->parent->local_change = true;
790 // change gradient, optionally writing to repr; prevent focus from moving if it's snapped
791 // to the center, unless it's the first update upon merge when we must snap it to the point
792 if (merging_focus ||
793 !(draggable->point_type == POINT_RG_FOCUS && this->isA(draggable->item, POINT_RG_CENTER, draggable->point_i, draggable->fill_or_stroke)))
794 sp_item_gradient_set_coords (draggable->item, draggable->point_type, draggable->point_i, this->point, draggable->fill_or_stroke, write_repr, scale_radial);
795 }
796 }
798 /**
799 Checks if the dragger has a draggable with this point_type
800 */
801 bool
802 GrDragger::isA (guint point_type)
803 {
804 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
805 GrDraggable *draggable = (GrDraggable *) i->data;
806 if (draggable->point_type == point_type) {
807 return true;
808 }
809 }
810 return false;
811 }
813 /**
814 Checks if the dragger has a draggable with this item, point_type, fill_or_stroke
815 */
816 bool
817 GrDragger::isA (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
818 {
819 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
820 GrDraggable *draggable = (GrDraggable *) i->data;
821 if ( (draggable->point_type == point_type) && (draggable->point_i == point_i) && (draggable->item == item) && (draggable->fill_or_stroke == fill_or_stroke) ) {
822 return true;
823 }
824 }
825 return false;
826 }
828 bool
829 GrDraggable::mayMerge (GrDraggable *da2)
830 {
831 if ((this->item == da2->item) && (this->fill_or_stroke == da2->fill_or_stroke)) {
832 // we must not merge the points of the same gradient!
833 if (!((this->point_type == POINT_RG_FOCUS && da2->point_type == POINT_RG_CENTER) ||
834 (this->point_type == POINT_RG_CENTER && da2->point_type == POINT_RG_FOCUS))) {
835 // except that we can snap center and focus together
836 return false;
837 }
838 }
839 // disable merging of midpoints.
840 if ( (this->point_type == POINT_LG_MID) || (da2->point_type == POINT_LG_MID)
841 || (this->point_type == POINT_RG_MID1) || (da2->point_type == POINT_RG_MID1)
842 || (this->point_type == POINT_RG_MID2) || (da2->point_type == POINT_RG_MID2) )
843 return false;
845 return true;
846 }
848 bool
849 GrDragger::mayMerge (GrDragger *other)
850 {
851 if (this == other)
852 return false;
854 for (GSList const* i = this->draggables; i != NULL; i = i->next) { // for all draggables of this
855 GrDraggable *da1 = (GrDraggable *) i->data;
856 for (GSList const* j = other->draggables; j != NULL; j = j->next) { // for all draggables of other
857 GrDraggable *da2 = (GrDraggable *) j->data;
858 if (!da1->mayMerge(da2))
859 return false;
860 }
861 }
862 return true;
863 }
865 bool
866 GrDragger::mayMerge (GrDraggable *da2)
867 {
868 for (GSList const* i = this->draggables; i != NULL; i = i->next) { // for all draggables of this
869 GrDraggable *da1 = (GrDraggable *) i->data;
870 if (!da1->mayMerge(da2))
871 return false;
872 }
873 return true;
874 }
876 /**
877 Updates the statusbar tip of the dragger knot, based on its draggables
878 */
879 void
880 GrDragger::updateTip ()
881 {
882 if (this->knot && this->knot->tip) {
883 g_free (this->knot->tip);
884 this->knot->tip = NULL;
885 }
887 if (g_slist_length (this->draggables) == 1) {
888 GrDraggable *draggable = (GrDraggable *) this->draggables->data;
889 char *item_desc = sp_item_description(draggable->item);
890 switch (draggable->point_type) {
891 case POINT_LG_MID:
892 case POINT_RG_MID1:
893 case POINT_RG_MID2:
894 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"),
895 _(gr_knot_descr[draggable->point_type]),
896 draggable->point_i,
897 item_desc,
898 draggable->fill_or_stroke == false ? _(" (stroke)") : "");
899 break;
901 default:
902 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"),
903 _(gr_knot_descr[draggable->point_type]),
904 item_desc,
905 draggable->fill_or_stroke == false ? _(" (stroke)") : "");
906 break;
907 }
908 g_free(item_desc);
909 } else if (g_slist_length (draggables) == 2 && isA (POINT_RG_CENTER) && isA (POINT_RG_FOCUS)) {
910 this->knot->tip = g_strdup_printf (_("Radial gradient <b>center</b> and <b>focus</b>; drag with <b>Shift</b> to separate focus"));
911 } else {
912 int length = g_slist_length (this->draggables);
913 this->knot->tip = g_strdup_printf (ngettext("Gradient point shared by <b>%d</b> gradient; drag with <b>Shift</b> to separate",
914 "Gradient point shared by <b>%d</b> gradients; drag with <b>Shift</b> to separate",
915 length),
916 length);
917 }
918 }
920 /**
921 Adds a draggable to the dragger
922 */
923 void
924 GrDragger::updateKnotShape ()
925 {
926 if (!draggables)
927 return;
928 GrDraggable *last = (GrDraggable *) g_slist_last(draggables)->data;
929 g_object_set (G_OBJECT (this->knot->item), "shape", gr_knot_shapes[last->point_type], NULL);
930 }
932 /**
933 Adds a draggable to the dragger
934 */
935 void
936 GrDragger::addDraggable (GrDraggable *draggable)
937 {
938 this->draggables = g_slist_prepend (this->draggables, draggable);
940 this->updateTip();
941 }
944 /**
945 Moves this dragger to the point of the given draggable, acting upon all other draggables
946 */
947 void
948 GrDragger::moveThisToDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, bool write_repr)
949 {
950 this->point = sp_item_gradient_get_coords (item, point_type, point_i, fill_or_stroke);
951 this->point_original = this->point;
953 sp_knot_moveto (this->knot, &(this->point));
955 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
956 GrDraggable *da = (GrDraggable *) i->data;
957 if ( (da->item == item) && (da->point_type == point_type) && (da->point_i == point_i) && (da->fill_or_stroke == fill_or_stroke) ) {
958 continue;
959 }
960 sp_item_gradient_set_coords (da->item, da->point_type, da->point_i, this->point, da->fill_or_stroke, write_repr, false);
961 }
962 // FIXME: here we should also call this->updateDependencies(write_repr); to propagate updating, but how to prevent loops?
963 }
966 /**
967 Moves all midstop draggables that depend on this one
968 */
969 void
970 GrDragger::updateMidstopDependencies (GrDraggable *draggable, bool write_repr) {
971 SPObject *server;
972 if (draggable->fill_or_stroke)
973 server = SP_OBJECT_STYLE_FILL_SERVER (draggable->item);
974 else
975 server = SP_OBJECT_STYLE_STROKE_SERVER (draggable->item);
976 guint num = SP_GRADIENT(server)->vector.stops.size();
977 if (num <= 2) return;
979 if ( SP_IS_LINEARGRADIENT(server) ) {
980 for ( guint i = 1; i < num - 1; i++ ) {
981 this->moveOtherToDraggable (draggable->item, POINT_LG_MID, i, draggable->fill_or_stroke, write_repr);
982 }
983 } else if ( SP_IS_RADIALGRADIENT(server) ) {
984 for ( guint i = 1; i < num - 1; i++ ) {
985 this->moveOtherToDraggable (draggable->item, POINT_RG_MID1, i, draggable->fill_or_stroke, write_repr);
986 this->moveOtherToDraggable (draggable->item, POINT_RG_MID2, i, draggable->fill_or_stroke, write_repr);
987 }
988 }
989 }
992 /**
993 Moves all draggables that depend on this one
994 */
995 void
996 GrDragger::updateDependencies (bool write_repr)
997 {
998 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
999 GrDraggable *draggable = (GrDraggable *) i->data;
1000 switch (draggable->point_type) {
1001 case POINT_LG_BEGIN:
1002 {
1003 // the end point is dependent only when dragging with ctrl+shift
1004 this->moveOtherToDraggable (draggable->item, POINT_LG_END, 0, draggable->fill_or_stroke, write_repr);
1006 this->updateMidstopDependencies (draggable, write_repr);
1007 }
1008 break;
1009 case POINT_LG_END:
1010 {
1011 // the begin point is dependent only when dragging with ctrl+shift
1012 this->moveOtherToDraggable (draggable->item, POINT_LG_BEGIN, 0, draggable->fill_or_stroke, write_repr);
1014 this->updateMidstopDependencies (draggable, write_repr);
1015 }
1016 break;
1017 case POINT_LG_MID:
1018 // no other nodes depend on mid points.
1019 break;
1020 case POINT_RG_R2:
1021 this->moveOtherToDraggable (draggable->item, POINT_RG_R1, 0, draggable->fill_or_stroke, write_repr);
1022 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, 0, draggable->fill_or_stroke, write_repr);
1023 this->updateMidstopDependencies (draggable, write_repr);
1024 break;
1025 case POINT_RG_R1:
1026 this->moveOtherToDraggable (draggable->item, POINT_RG_R2, 0, draggable->fill_or_stroke, write_repr);
1027 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, 0, draggable->fill_or_stroke, write_repr);
1028 this->updateMidstopDependencies (draggable, write_repr);
1029 break;
1030 case POINT_RG_CENTER:
1031 this->moveOtherToDraggable (draggable->item, POINT_RG_R1, 0, draggable->fill_or_stroke, write_repr);
1032 this->moveOtherToDraggable (draggable->item, POINT_RG_R2, 0, draggable->fill_or_stroke, write_repr);
1033 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, 0, draggable->fill_or_stroke, write_repr);
1034 this->updateMidstopDependencies (draggable, write_repr);
1035 break;
1036 case POINT_RG_FOCUS:
1037 // nothing can depend on that
1038 break;
1039 case POINT_RG_MID1:
1040 this->moveOtherToDraggable (draggable->item, POINT_RG_MID2, draggable->point_i, draggable->fill_or_stroke, write_repr);
1041 break;
1042 case POINT_RG_MID2:
1043 this->moveOtherToDraggable (draggable->item, POINT_RG_MID1, draggable->point_i, draggable->fill_or_stroke, write_repr);
1044 break;
1045 default:
1046 break;
1047 }
1048 }
1049 }
1053 GrDragger::GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable)
1054 {
1055 this->draggables = NULL;
1057 this->parent = parent;
1059 this->point = p;
1060 this->point_original = p;
1062 // create the knot
1063 this->knot = sp_knot_new (parent->desktop, NULL);
1064 this->knot->setMode(SP_KNOT_MODE_XOR);
1065 this->knot->setFill(GR_KNOT_COLOR_NORMAL, GR_KNOT_COLOR_NORMAL, GR_KNOT_COLOR_NORMAL);
1066 this->knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1067 sp_knot_update_ctrl(this->knot);
1069 // move knot to the given point
1070 sp_knot_set_position (this->knot, &p, SP_KNOT_STATE_NORMAL);
1071 sp_knot_show (this->knot);
1073 // connect knot's signals
1074 if ( (draggable) // it can be NULL if a node in unsnapped (eg. focus point unsnapped from center)
1075 // luckily, midstops never snap to other nodes so are never unsnapped...
1076 && ( (draggable->point_type == POINT_LG_MID)
1077 || (draggable->point_type == POINT_RG_MID1)
1078 || (draggable->point_type == POINT_RG_MID2) ) )
1079 {
1080 this->handler_id = g_signal_connect (G_OBJECT (this->knot), "moved", G_CALLBACK (gr_knot_moved_midpoint_handler), this);
1081 } else {
1082 this->handler_id = g_signal_connect (G_OBJECT (this->knot), "moved", G_CALLBACK (gr_knot_moved_handler), this);
1083 }
1084 g_signal_connect (G_OBJECT (this->knot), "clicked", G_CALLBACK (gr_knot_clicked_handler), this);
1085 g_signal_connect (G_OBJECT (this->knot), "doubleclicked", G_CALLBACK (gr_knot_doubleclicked_handler), this);
1086 g_signal_connect (G_OBJECT (this->knot), "grabbed", G_CALLBACK (gr_knot_grabbed_handler), this);
1087 g_signal_connect (G_OBJECT (this->knot), "ungrabbed", G_CALLBACK (gr_knot_ungrabbed_handler), this);
1089 // add the initial draggable
1090 if (draggable)
1091 this->addDraggable (draggable);
1092 updateKnotShape();
1093 }
1095 GrDragger::~GrDragger ()
1096 {
1097 // unselect if it was selected
1098 this->parent->setDeselected(this);
1100 // disconnect signals
1101 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_moved_handler), this);
1102 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_clicked_handler), this);
1103 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_doubleclicked_handler), this);
1104 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_grabbed_handler), this);
1105 g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_ungrabbed_handler), this);
1107 /* unref should call destroy */
1108 g_object_unref (G_OBJECT (this->knot));
1110 // delete all draggables
1111 for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1112 delete ((GrDraggable *) i->data);
1113 }
1114 g_slist_free (this->draggables);
1115 this->draggables = NULL;
1116 }
1118 /**
1119 Select the dragger which has the given draggable.
1120 */
1121 GrDragger *
1122 GrDrag::getDraggerFor (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
1123 {
1124 for (GList const* i = this->draggers; i != NULL; i = i->next) {
1125 GrDragger *dragger = (GrDragger *) i->data;
1126 for (GSList const* j = dragger->draggables; j != NULL; j = j->next) {
1127 GrDraggable *da2 = (GrDraggable *) j->data;
1128 if ( (da2->item == item) && (da2->point_type == point_type) && (da2->point_i == point_i) && (da2->fill_or_stroke == fill_or_stroke)) {
1129 return (dragger);
1130 }
1131 }
1132 }
1133 return NULL;
1134 }
1137 void
1138 GrDragger::moveOtherToDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, bool write_repr)
1139 {
1140 GrDragger *d = this->parent->getDraggerFor (item, point_type, point_i, fill_or_stroke);
1141 if (d && d != this) {
1142 d->moveThisToDraggable (item, point_type, point_i, fill_or_stroke, write_repr);
1143 }
1144 }
1147 /**
1148 Draw this dragger as selected
1149 */
1150 void
1151 GrDragger::select()
1152 {
1153 this->knot->fill [SP_KNOT_STATE_NORMAL] = GR_KNOT_COLOR_SELECTED;
1154 g_object_set (G_OBJECT (this->knot->item), "fill_color", GR_KNOT_COLOR_SELECTED, NULL);
1155 }
1157 /**
1158 Draw this dragger as normal (deselected)
1159 */
1160 void
1161 GrDragger::deselect()
1162 {
1163 this->knot->fill [SP_KNOT_STATE_NORMAL] = GR_KNOT_COLOR_NORMAL;
1164 g_object_set (G_OBJECT (this->knot->item), "fill_color", GR_KNOT_COLOR_NORMAL, NULL);
1165 }
1169 /**
1170 \brief Deselect all stops/draggers (private)
1171 */
1172 void
1173 GrDrag::deselect_all()
1174 {
1175 while (selected) {
1176 ( (GrDragger*) selected->data)->deselect();
1177 selected = g_list_remove(selected, selected->data);
1178 }
1179 }
1181 /**
1182 \brief Deselect all stops/draggers (public; emits signal)
1183 */
1184 void
1185 GrDrag::deselectAll()
1186 {
1187 deselect_all();
1188 this->desktop->emitToolSubselectionChanged(NULL);
1189 }
1192 /**
1193 \brief Select a dragger
1194 \param dragger The dragger to select
1195 \param add_to_selection If true, add to selection, otherwise deselect others
1196 \param override If true, always select this node, otherwise toggle selected status
1197 */
1198 void
1199 GrDrag::setSelected (GrDragger *dragger, bool add_to_selection, bool override)
1200 {
1201 GrDragger *seldragger = NULL;
1203 if (add_to_selection) {
1204 if (!dragger) return;
1205 if (override) {
1206 if (!g_list_find(selected, dragger)) {
1207 selected = g_list_prepend(selected, dragger);
1208 }
1209 dragger->select();
1210 seldragger = dragger;
1211 } else { // toggle
1212 if (g_list_find(selected, dragger)) {
1213 selected = g_list_remove(selected, dragger);
1214 dragger->deselect();
1215 if (selected) {
1216 seldragger = (GrDragger*) selected->data; // select the dragger that is first in the list
1217 }
1218 } else {
1219 selected = g_list_prepend(selected, dragger);
1220 dragger->select();
1221 seldragger = dragger;
1222 }
1223 }
1224 } else {
1225 deselect_all();
1226 if (dragger) {
1227 selected = g_list_prepend(selected, dragger);
1228 dragger->select();
1229 seldragger = dragger;
1230 }
1231 }
1232 if (seldragger) {
1233 this->desktop->emitToolSubselectionChanged((gpointer) seldragger);
1234 }
1235 }
1237 /**
1238 \brief Deselect a dragger
1239 \param dragger The dragger to deselect
1240 */
1241 void
1242 GrDrag::setDeselected (GrDragger *dragger)
1243 {
1244 if (g_list_find(selected, dragger)) {
1245 selected = g_list_remove(selected, dragger);
1246 dragger->deselect();
1247 }
1248 this->desktop->emitToolSubselectionChanged((gpointer) (selected ? selected->data : NULL ));
1249 }
1253 /**
1254 Create a line from p1 to p2 and add it to the lines list
1255 */
1256 void
1257 GrDrag::addLine (NR::Point p1, NR::Point p2, guint32 rgba)
1258 {
1259 SPCanvasItem *line = sp_canvas_item_new(sp_desktop_controls(this->desktop),
1260 SP_TYPE_CTRLLINE, NULL);
1261 sp_ctrlline_set_coords(SP_CTRLLINE(line), p1, p2);
1262 if (rgba != GR_LINE_COLOR_FILL) // fill is the default, so don't set color for it to speed up redraw
1263 sp_ctrlline_set_rgba32 (SP_CTRLLINE(line), rgba);
1264 sp_canvas_item_show (line);
1265 this->lines = g_slist_append (this->lines, line);
1266 }
1268 /**
1269 If there already exists a dragger within MERGE_DIST of p, add the draggable to it; otherwise create
1270 new dragger and add it to draggers list
1271 */
1272 void
1273 GrDrag::addDragger (GrDraggable *draggable)
1274 {
1275 NR::Point p = sp_item_gradient_get_coords (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
1277 for (GList *i = this->draggers; i != NULL; i = i->next) {
1278 GrDragger *dragger = (GrDragger *) i->data;
1279 if (dragger->mayMerge (draggable) && NR::L2 (dragger->point - p) < MERGE_DIST) {
1280 // distance is small, merge this draggable into dragger, no need to create new dragger
1281 dragger->addDraggable (draggable);
1282 dragger->updateKnotShape();
1283 return;
1284 }
1285 }
1287 GrDragger *new_dragger = new GrDragger(this, p, draggable);
1288 // fixme: draggers should be added AFTER the last one: this way tabbing through them will be from begin to end.
1289 this->draggers = g_list_append (this->draggers, new_dragger);
1290 }
1292 /**
1293 Add draggers for the radial gradient rg on item
1294 */
1295 void
1296 GrDrag::addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke)
1297 {
1298 addDragger (new GrDraggable (item, POINT_RG_CENTER, 0, fill_or_stroke));
1299 guint num = rg->vector.stops.size();
1300 if (num > 2) {
1301 for ( guint i = 1; i < num - 1; i++ ) {
1302 addDragger (new GrDraggable (item, POINT_RG_MID1, i, fill_or_stroke));
1303 }
1304 }
1305 addDragger (new GrDraggable (item, POINT_RG_R1, 0, fill_or_stroke));
1306 if (num > 2) {
1307 for ( guint i = 1; i < num - 1; i++ ) {
1308 addDragger (new GrDraggable (item, POINT_RG_MID2, i, fill_or_stroke));
1309 }
1310 }
1311 addDragger (new GrDraggable (item, POINT_RG_R2, 0, fill_or_stroke));
1312 addDragger (new GrDraggable (item, POINT_RG_FOCUS, 0, fill_or_stroke));
1313 }
1315 /**
1316 Add draggers for the linear gradient lg on item
1317 */
1318 void
1319 GrDrag::addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke)
1320 {
1321 addDragger (new GrDraggable (item, POINT_LG_BEGIN, 0, fill_or_stroke));
1322 guint num = lg->vector.stops.size();
1323 if (num > 2) {
1324 for ( guint i = 1; i < num - 1; i++ ) {
1325 addDragger (new GrDraggable (item, POINT_LG_MID, i, fill_or_stroke));
1326 }
1327 }
1328 addDragger (new GrDraggable (item, POINT_LG_END, 0, fill_or_stroke));
1329 }
1331 /**
1332 Artificially grab the knot of the dragger with this draggable; used by the gradient context
1333 */
1334 void
1335 GrDrag::grabKnot (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime)
1336 {
1337 GrDragger *dragger = getDraggerFor (item, point_type, point_i, fill_or_stroke);
1338 if (dragger) {
1339 sp_knot_start_dragging (dragger->knot, dragger->point, x, y, etime);
1340 }
1341 }
1343 /**
1344 Regenerates the draggers list from the current selection; is called when selection is changed or
1345 modified, also when a radial dragger needs to update positions of other draggers in the gradient
1346 */
1347 void
1348 GrDrag::updateDraggers ()
1349 {
1350 while (selected) {
1351 selected = g_list_remove(selected, selected->data);
1352 }
1353 // delete old draggers
1354 for (GList const* i = this->draggers; i != NULL; i = i->next) {
1355 delete ((GrDragger *) i->data);
1356 }
1357 g_list_free (this->draggers);
1358 this->draggers = NULL;
1360 g_return_if_fail (this->selection != NULL);
1362 for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1364 SPItem *item = SP_ITEM(i->data);
1365 SPStyle *style = SP_OBJECT_STYLE (item);
1367 if (style && (style->fill.type == SP_PAINT_TYPE_PAINTSERVER)) {
1368 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER (item);
1369 if (SP_IS_LINEARGRADIENT (server)) {
1370 addDraggersLinear (SP_LINEARGRADIENT (server), item, true);
1371 } else if (SP_IS_RADIALGRADIENT (server)) {
1372 addDraggersRadial (SP_RADIALGRADIENT (server), item, true);
1373 }
1374 }
1376 if (style && (style->stroke.type == SP_PAINT_TYPE_PAINTSERVER)) {
1377 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER (item);
1378 if (SP_IS_LINEARGRADIENT (server)) {
1379 addDraggersLinear (SP_LINEARGRADIENT (server), item, false);
1380 } else if (SP_IS_RADIALGRADIENT (server)) {
1381 addDraggersRadial (SP_RADIALGRADIENT (server), item, false);
1382 }
1383 }
1384 }
1385 }
1387 /**
1388 Regenerates the lines list from the current selection; is called on each move of a dragger, so that
1389 lines are always in sync with the actual gradient
1390 */
1391 void
1392 GrDrag::updateLines ()
1393 {
1394 // delete old lines
1395 for (GSList const *i = this->lines; i != NULL; i = i->next) {
1396 gtk_object_destroy( GTK_OBJECT (i->data));
1397 }
1398 g_slist_free (this->lines);
1399 this->lines = NULL;
1401 g_return_if_fail (this->selection != NULL);
1403 for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1405 SPItem *item = SP_ITEM(i->data);
1407 SPStyle *style = SP_OBJECT_STYLE (item);
1409 if (style && (style->fill.type == SP_PAINT_TYPE_PAINTSERVER)) {
1410 SPObject *server = SP_OBJECT_STYLE_FILL_SERVER (item);
1411 if (SP_IS_LINEARGRADIENT (server)) {
1412 this->addLine (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);
1413 } else if (SP_IS_RADIALGRADIENT (server)) {
1414 NR::Point center = sp_item_gradient_get_coords (item, POINT_RG_CENTER, 0, true);
1415 this->addLine (center, sp_item_gradient_get_coords (item, POINT_RG_R1, 0, true), GR_LINE_COLOR_FILL);
1416 this->addLine (center, sp_item_gradient_get_coords (item, POINT_RG_R2, 0, true), GR_LINE_COLOR_FILL);
1417 }
1418 }
1420 if (style && (style->stroke.type == SP_PAINT_TYPE_PAINTSERVER)) {
1421 SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER (item);
1422 if (SP_IS_LINEARGRADIENT (server)) {
1423 this->addLine (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);
1424 } else if (SP_IS_RADIALGRADIENT (server)) {
1425 NR::Point center = sp_item_gradient_get_coords (item, POINT_RG_CENTER, 0, false);
1426 this->addLine (center, sp_item_gradient_get_coords (item, POINT_RG_R1, 0, false), GR_LINE_COLOR_STROKE);
1427 this->addLine (center, sp_item_gradient_get_coords (item, POINT_RG_R2, 0, false), GR_LINE_COLOR_STROKE);
1428 }
1429 }
1430 }
1431 }
1433 /**
1434 Regenerates the levels list from the current selection
1435 */
1436 void
1437 GrDrag::updateLevels ()
1438 {
1439 hor_levels.clear();
1440 vert_levels.clear();
1442 g_return_if_fail (this->selection != NULL);
1444 for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1445 SPItem *item = SP_ITEM(i->data);
1446 NR::Rect rect = sp_item_bbox_desktop (item);
1447 // Remember the edges of the bbox and the center axis
1448 hor_levels.push_back(rect.min()[NR::Y]);
1449 hor_levels.push_back(rect.max()[NR::Y]);
1450 hor_levels.push_back(0.5 * (rect.min()[NR::Y] + rect.max()[NR::Y]));
1451 vert_levels.push_back(rect.min()[NR::X]);
1452 vert_levels.push_back(rect.max()[NR::X]);
1453 vert_levels.push_back(0.5 * (rect.min()[NR::X] + rect.max()[NR::X]));
1454 }
1455 }
1457 void
1458 GrDrag::selected_reverse_vector ()
1459 {
1460 if (selected == NULL)
1461 return;
1463 for (GSList const* i = ( (GrDragger*) selected->data )->draggables; i != NULL; i = i->next) {
1464 GrDraggable *draggable = (GrDraggable *) i->data;
1466 sp_item_gradient_reverse_vector (draggable->item, draggable->fill_or_stroke);
1467 }
1468 }
1470 void
1471 GrDrag::selected_move (double x, double y)
1472 {
1473 /*
1474 if (selected == NULL)
1475 return;
1477 if ( (g_list_length(selected) == 1) )
1478 selected->point += NR::Point (x, y);
1479 selected->point_original = selected->point;
1480 sp_knot_moveto (selected->knot, &(selected->point));
1482 selected->fireDraggables (true);
1484 selected->updateDependencies(true);
1486 // we did an undoable action
1487 sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
1488 _("Move gradient handle"));
1489 */
1490 }
1492 void
1493 GrDrag::selected_move_screen (double x, double y)
1494 {
1495 gdouble zoom = desktop->current_zoom();
1496 gdouble zx = x / zoom;
1497 gdouble zy = y / zoom;
1499 selected_move (zx, zy);
1500 }
1502 /**
1503 Select the knot next to the last selected one and deselect all other selected.
1504 */
1505 void
1506 GrDrag::select_next ()
1507 {
1508 if (selected == NULL || g_list_find(draggers, selected->data)->next == NULL) {
1509 if (draggers)
1510 setSelected ((GrDragger *) draggers->data);
1511 } else {
1512 setSelected ((GrDragger *) g_list_find(draggers, selected->data)->next->data);
1513 }
1514 }
1516 /**
1517 Select the knot previous from the last selected one and deselect all other selected.
1518 */
1519 void
1520 GrDrag::select_prev ()
1521 {
1522 if (selected == NULL || g_list_find(draggers, selected->data)->prev == NULL) {
1523 if (draggers)
1524 setSelected ((GrDragger *) g_list_last (draggers)->data);
1525 } else {
1526 setSelected ((GrDragger *) g_list_find(draggers, selected->data)->prev->data);
1527 }
1528 }
1531 // FIXME: i.m.o. an ugly function that I just made to work, but... aargh! (Johan)
1532 void
1533 GrDrag::deleteSelected (bool just_one)
1534 {
1535 if (!selected) return;
1537 SPDocument *document = false;
1539 struct StructStopInfo {
1540 SPStop * spstop;
1541 GrDraggable * draggable;
1542 SPGradient * gradient;
1543 SPGradient * vector;
1544 };
1546 GSList *midstoplist = NULL; // list of stops that must be deleted (will be deleted first)
1547 GSList *endstoplist = NULL; // list of stops that must be deleted
1548 while (selected) {
1549 GrDragger *dragger = (GrDragger*) selected->data;
1550 for (GSList * drgble = dragger->draggables; drgble != NULL; drgble = drgble->next) {
1551 GrDraggable *draggable = (GrDraggable*) drgble->data;
1552 SPGradient *gradient = sp_item_gradient (draggable->item, draggable->fill_or_stroke);
1553 SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (gradient, false);
1555 switch (draggable->point_type) {
1556 case POINT_LG_MID:
1557 case POINT_RG_MID1:
1558 case POINT_RG_MID2:
1559 {
1560 SPStop *stop = sp_get_stop_i(vector, draggable->point_i);
1561 // check if already present in list. (e.g. when both RG_MID1 and RG_MID2 were selected)
1562 bool present = false;
1563 for (GSList const * l = midstoplist; l != NULL; l = l->next) {
1564 if ( (SPStop*)l->data == stop ) {
1565 present = true;
1566 break; // no need to search further.
1567 }
1568 }
1569 if (!present)
1570 midstoplist = g_slist_append(midstoplist, stop);
1571 }
1572 break;
1573 case POINT_LG_BEGIN:
1574 case POINT_LG_END:
1575 case POINT_RG_CENTER:
1576 case POINT_RG_R1:
1577 case POINT_RG_R2:
1578 {
1579 SPStop *stop = NULL;
1580 if ( (draggable->point_type == POINT_LG_BEGIN) || (draggable->point_type == POINT_RG_CENTER) ) {
1581 stop = sp_first_stop(vector);
1582 } else {
1583 stop = sp_last_stop(vector);
1584 }
1585 if (stop) {
1586 StructStopInfo *stopinfo = new StructStopInfo;
1587 stopinfo->spstop = stop;
1588 stopinfo->draggable = draggable;
1589 stopinfo->gradient = gradient;
1590 stopinfo->vector = vector;
1591 // check if already present in list. (e.g. when both R1 and R2 were selected)
1592 bool present = false;
1593 for (GSList const * l = endstoplist; l != NULL; l = l->next) {
1594 if ( ((StructStopInfo*)l->data)->spstop == stopinfo->spstop ) {
1595 present = true;
1596 break; // no need to search further.
1597 }
1598 }
1599 if (!present)
1600 endstoplist = g_slist_append(endstoplist, stopinfo);
1601 }
1602 }
1603 break;
1604 default:
1605 break;
1606 }
1607 }
1608 selected = g_list_remove(selected, dragger);
1609 if ( just_one ) break; // iterate once if just_one is set.
1610 }
1611 while (midstoplist) {
1612 SPStop *stop = (SPStop*) midstoplist->data;
1613 document = SP_OBJECT_DOCUMENT (stop);
1614 Inkscape::XML::Node * parent = SP_OBJECT_REPR(stop)->parent();
1615 parent->removeChild(SP_OBJECT_REPR(stop));
1616 midstoplist = g_slist_remove(midstoplist, stop);
1617 }
1618 while (endstoplist) {
1619 StructStopInfo *stopinfo = (StructStopInfo*) endstoplist->data;
1620 document = SP_OBJECT_DOCUMENT (stopinfo->spstop);
1622 // 2 is the minimum, cannot delete more than that without deleting the whole vector
1623 // cannot use vector->vector.stops.size() because the vector might be invalidated by deletion of a midstop
1624 // manually count the children, don't know if there already exists a function for this...
1625 int len = 0;
1626 for ( SPObject *child = sp_object_first_child(stopinfo->vector) ;
1627 child != NULL ;
1628 child = SP_OBJECT_NEXT(child) )
1629 {
1630 if ( SP_IS_STOP(child) ) len ++;
1631 }
1632 if (len > 2)
1633 {
1634 switch (stopinfo->draggable->point_type) {
1635 case POINT_LG_BEGIN:
1636 {
1637 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1639 SPLinearGradient *lg = SP_LINEARGRADIENT(stopinfo->gradient);
1640 NR::Point oldbegin = NR::Point (lg->x1.computed, lg->y1.computed);
1641 NR::Point end = NR::Point (lg->x2.computed, lg->y2.computed);
1642 SPStop *stop = sp_first_stop(stopinfo->vector);
1643 gdouble offset = stop->offset;
1644 NR::Point newbegin = oldbegin + offset * (end - oldbegin);
1645 lg->x1.computed = newbegin[NR::X];
1646 lg->y1.computed = newbegin[NR::Y];
1648 Inkscape::XML::Node *repr = SP_OBJECT_REPR(stopinfo->gradient);
1649 sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
1650 sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
1651 stop->offset = 0;
1652 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", 0);
1654 // iterate through midstops to set new offset values such that they won't move on canvas.
1655 SPStop *laststop = sp_last_stop(stopinfo->vector);
1656 stop = sp_next_stop(stop);
1657 while ( stop != laststop ) {
1658 stop->offset = (stop->offset - offset)/(1 - offset);
1659 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
1660 stop = sp_next_stop(stop);
1661 }
1662 }
1663 break;
1664 case POINT_LG_END:
1665 {
1666 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1668 SPLinearGradient *lg = SP_LINEARGRADIENT(stopinfo->gradient);
1669 NR::Point begin = NR::Point (lg->x1.computed, lg->y1.computed);
1670 NR::Point oldend = NR::Point (lg->x2.computed, lg->y2.computed);
1671 SPStop *laststop = sp_last_stop(stopinfo->vector);
1672 gdouble offset = laststop->offset;
1673 NR::Point newend = begin + offset * (oldend - begin);
1674 lg->x2.computed = newend[NR::X];
1675 lg->y2.computed = newend[NR::Y];
1677 Inkscape::XML::Node *repr = SP_OBJECT_REPR(stopinfo->gradient);
1678 sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
1679 sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
1680 laststop->offset = 1;
1681 sp_repr_set_css_double (SP_OBJECT_REPR (laststop), "offset", 1);
1683 // iterate through midstops to set new offset values such that they won't move on canvas.
1684 SPStop *stop = sp_first_stop(stopinfo->vector);
1685 stop = sp_next_stop(stop);
1686 while ( stop != laststop ) {
1687 stop->offset = stop->offset / offset;
1688 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
1689 stop = sp_next_stop(stop);
1690 }
1691 }
1692 break;
1693 case POINT_RG_CENTER:
1694 {
1695 SPStop *newfirst = sp_next_stop (stopinfo->spstop);
1696 if (newfirst) {
1697 newfirst->offset = 0;
1698 sp_repr_set_css_double (SP_OBJECT_REPR (newfirst), "offset", 0);
1699 }
1700 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1701 }
1702 break;
1703 case POINT_RG_R1:
1704 case POINT_RG_R2:
1705 SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1707 SPRadialGradient *rg = SP_RADIALGRADIENT(stopinfo->gradient);
1708 double oldradius = rg->r.computed;
1709 SPStop *laststop = sp_last_stop(stopinfo->vector);
1710 gdouble offset = laststop->offset;
1711 double newradius = offset * oldradius;
1712 rg->r.computed = newradius;
1714 Inkscape::XML::Node *repr = SP_OBJECT_REPR(rg);
1715 sp_repr_set_svg_double(repr, "r", rg->r.computed);
1716 laststop->offset = 1;
1717 sp_repr_set_css_double (SP_OBJECT_REPR (laststop), "offset", 1);
1719 // iterate through midstops to set new offset values such that they won't move on canvas.
1720 SPStop *stop = sp_first_stop(stopinfo->vector);
1721 stop = sp_next_stop(stop);
1722 while ( stop != laststop ) {
1723 stop->offset = stop->offset / offset;
1724 sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
1725 stop = sp_next_stop(stop);
1726 }
1727 break;
1728 }
1729 }
1730 else
1731 { // delete the gradient from the object. set fill to unset FIXME: set to fill of unselected node?
1732 SPCSSAttr *css = sp_repr_css_attr_new ();
1733 if (stopinfo->draggable->fill_or_stroke) {
1734 sp_repr_css_unset_property (css, "fill");
1735 } else {
1736 sp_repr_css_unset_property (css, "stroke");
1737 }
1738 sp_repr_css_change (SP_OBJECT_REPR (stopinfo->draggable->item), css, "style");
1739 sp_repr_css_attr_unref (css);
1740 }
1742 endstoplist = g_slist_remove(endstoplist, stopinfo);
1743 delete stopinfo;
1744 }
1746 if (document) {
1747 sp_document_done ( document, SP_VERB_CONTEXT_GRADIENT, _("Delete gradient stop(s)") );
1748 }
1749 }
1752 /*
1753 Local Variables:
1754 mode:c++
1755 c-file-style:"stroustrup"
1756 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1757 indent-tabs-mode:nil
1758 fill-column:99
1759 End:
1760 */
1761 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :