src/gradient-drag.cpp

   1 #define __GRADIENT_DRAG_C__
   2
   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  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 #include "config.h"
  18 #endif
  19
  20 #include <glibmm/i18n.h>
  21
  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"
  28 #include "xml/repr.h"
  29 #include "svg/css-ostringstream.h"
  30 #include "svg/svg.h"
  31 #include "libnr/nr-point-fns.h"
  32 #include "prefs-utils.h"
  33 #include "sp-item.h"
  34 #include "style.h"
  35 #include "knot.h"
  36 #include "sp-linear-gradient.h"
  37 #include "sp-radial-gradient.h"
  38 #include "gradient-chemistry.h"
  39 #include "gradient-drag.h"
  40 #include "sp-stop.h"
  41 #include "snap.h"
  42 #include "sp-namedview.h"
  43 #include "selection-chemistry.h"
  44
  45
  46 #define GR_KNOT_COLOR_NORMAL 0xffffff00
  47 #define GR_KNOT_COLOR_MOUSEOVER 0xff000000
  48 #define GR_KNOT_COLOR_SELECTED 0x0000ff00
  49
  50 #define GR_LINE_COLOR_FILL 0x0000ff7f
  51 #define GR_LINE_COLOR_STROKE 0x9999007f
  52
  53 // screen pixels between knots when they snap:
  54 #define SNAP_DIST 5
  55
  56 // absolute distance between gradient points for them to become a single dragger when the drag is created:
  57 #define MERGE_DIST 0.1
  58
  59 // knot shapes corresponding to GrPointType enum
  60 SPKnotShapeType gr_knot_shapes [] = {
  61         SP_KNOT_SHAPE_SQUARE, //POINT_LG_BEGIN
  62         SP_KNOT_SHAPE_CIRCLE,  //POINT_LG_END
  63         SP_KNOT_SHAPE_DIAMOND, //POINT_LG_MID
  64         SP_KNOT_SHAPE_SQUARE,  // POINT_RG_CENTER
  65         SP_KNOT_SHAPE_CIRCLE,  // POINT_RG_R1
  66         SP_KNOT_SHAPE_CIRCLE,  // POINT_RG_R2
  67         SP_KNOT_SHAPE_CROSS, // POINT_RG_FOCUS
  68         SP_KNOT_SHAPE_DIAMOND, //POINT_RG_MID1
  69         SP_KNOT_SHAPE_DIAMOND //POINT_RG_MID2
  70 };
  71
  72 const gchar *gr_knot_descr [] = {
  73     N_("Linear gradient <b>start</b>"), //POINT_LG_BEGIN
  74     N_("Linear gradient <b>end</b>"),
  75     N_("Linear gradient <b>mid stop</b>"),
  76     N_("Radial gradient <b>center</b>"),
  77     N_("Radial gradient <b>radius</b>"),
  78     N_("Radial gradient <b>radius</b>"),
  79     N_("Radial gradient <b>focus</b>"), // POINT_RG_FOCUS
  80     N_("Radial gradient <b>mid stop</b>"),
  81     N_("Radial gradient <b>mid stop</b>")
  82 };
  83
  84 static void
  85 gr_drag_sel_changed(Inkscape::Selection *selection, gpointer data)
  86 {
  87         GrDrag *drag = (GrDrag *) data;
  88         drag->updateDraggers ();
  89         drag->updateLines ();
  90         drag->updateLevels ();
  91 }
  92
  93 static void
  94 gr_drag_sel_modified (Inkscape::Selection *selection, guint flags, gpointer data)
  95 {
  96     GrDrag *drag = (GrDrag *) data;
  97     if (drag->local_change) {
  98         drag->local_change = false;
  99     } else {
 100         drag->updateDraggers ();
 101     }
 102     drag->updateLines ();
 103     drag->updateLevels ();
 104 }
 105
 106 /**
 107 When a _query_style_signal is received, check that \a property requests fill/stroke/opacity (otherwise
 108 skip), and fill the \a style with the averaged color of all draggables of the selected dragger, if
 109 any.
 110 */
 111 int
 112 gr_drag_style_query (SPStyle *style, int property, gpointer data)
 113 {
 114     GrDrag *drag = (GrDrag *) data;
 115
 116     if (property != QUERY_STYLE_PROPERTY_FILL && property != QUERY_STYLE_PROPERTY_STROKE && property != QUERY_STYLE_PROPERTY_MASTEROPACITY) {
 117         return QUERY_STYLE_NOTHING;
 118     }
 119
 120     if (!drag->selected) {
 121         return QUERY_STYLE_NOTHING;
 122     } else {
 123         int ret = QUERY_STYLE_NOTHING;
 124
 125         float cf[4];
 126         cf[0] = cf[1] = cf[2] = cf[3] = 0;
 127
 128         int count = 0;
 129
 130         for (GList *i = drag->selected; i != NULL; i = i->next) { // for all selected draggers
 131             GrDragger *d = (GrDragger *) i->data;
 132             for (GSList const* j = d->draggables; j != NULL; j = j->next) { // for all draggables of dragger
 133                 GrDraggable *draggable = (GrDraggable *) j->data;
 134
 135                 if (ret == QUERY_STYLE_NOTHING) {
 136                     ret = QUERY_STYLE_SINGLE;
 137                 } else if (ret == QUERY_STYLE_SINGLE) {
 138                     ret = QUERY_STYLE_MULTIPLE_AVERAGED;
 139                 }
 140
 141                 guint32 c = sp_item_gradient_stop_query_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
 142                 cf[0] += SP_RGBA32_R_F (c);
 143                 cf[1] += SP_RGBA32_G_F (c);
 144                 cf[2] += SP_RGBA32_B_F (c);
 145                 cf[3] += SP_RGBA32_A_F (c);
 146
 147                 count ++;
 148             }
 149         }
 150
 151         if (count) {
 152             cf[0] /= count;
 153             cf[1] /= count;
 154             cf[2] /= count;
 155             cf[3] /= count;
 156
 157             // set both fill and stroke with our stop-color and stop-opacity
 158             style->fill.clear();
 159             style->fill.setColor( cf[0], cf[1], cf[2] );
 160             style->fill.set = TRUE;
 161             style->stroke.clear();
 162             style->stroke.setColor( cf[0], cf[1], cf[2] );
 163             style->stroke.set = TRUE;
 164
 165             style->fill_opacity.value = SP_SCALE24_FROM_FLOAT (1.0);
 166             style->fill_opacity.set = TRUE;
 167             style->stroke_opacity.value = SP_SCALE24_FROM_FLOAT (1.0);
 168             style->stroke_opacity.set = TRUE;
 169
 170             style->opacity.value = SP_SCALE24_FROM_FLOAT (cf[3]);
 171             style->opacity.set = TRUE;
 172         }
 173
 174         return ret;
 175     }
 176 }
 177
 178 bool
 179 gr_drag_style_set (const SPCSSAttr *css, gpointer data)
 180 {
 181     GrDrag *drag = (GrDrag *) data;
 182
 183     if (!drag->selected)
 184         return false;
 185
 186     SPCSSAttr *stop = sp_repr_css_attr_new ();
 187
 188     // See if the css contains interesting properties, and if so, translate them into the format
 189     // acceptable for gradient stops
 190
 191     // any of color properties, in order of increasing priority:
 192     if (css->attribute("flood-color"))
 193         sp_repr_css_set_property (stop, "stop-color", css->attribute("flood-color"));
 194
 195     if (css->attribute("lighting-color"))
 196         sp_repr_css_set_property (stop, "stop-color", css->attribute("lighting-color"));
 197
 198     if (css->attribute("color"))
 199         sp_repr_css_set_property (stop, "stop-color", css->attribute("color"));
 200
 201     if (css->attribute("stroke") && strcmp(css->attribute("stroke"), "none"))
 202         sp_repr_css_set_property (stop, "stop-color", css->attribute("stroke"));
 203
 204     if (css->attribute("fill") && strcmp(css->attribute("fill"), "none"))
 205         sp_repr_css_set_property (stop, "stop-color", css->attribute("fill"));
 206
 207     if (css->attribute("stop-color"))
 208         sp_repr_css_set_property (stop, "stop-color", css->attribute("stop-color"));
 209
 210
 211     if (css->attribute("stop-opacity")) { // direct setting of stop-opacity has priority
 212         sp_repr_css_set_property (stop, "stop-opacity", css->attribute("stop-opacity"));
 213     } else {  // multiply all opacity properties:
 214         gdouble accumulated = 1.0;
 215         accumulated *= sp_svg_read_percentage(css->attribute("flood-opacity"), 1.0);
 216         accumulated *= sp_svg_read_percentage(css->attribute("opacity"), 1.0);
 217         accumulated *= sp_svg_read_percentage(css->attribute("stroke-opacity"), 1.0);
 218         accumulated *= sp_svg_read_percentage(css->attribute("fill-opacity"), 1.0);
 219
 220         Inkscape::CSSOStringStream os;
 221         os << accumulated;
 222         sp_repr_css_set_property (stop, "stop-opacity", os.str().c_str());
 223
 224         if ((css->attribute("fill") && !css->attribute("stroke") && !strcmp(css->attribute("fill"), "none")) ||
 225             (css->attribute("stroke") && !css->attribute("fill") && !strcmp(css->attribute("stroke"), "none")))
 226             sp_repr_css_set_property (stop, "stop-opacity", "0"); // if a single fill/stroke property is set to none, don't change color, set opacity to 0
 227     }
 228
 229     if (!stop->attributeList()) { // nothing for us here, pass it on
 230         sp_repr_css_attr_unref(stop);
 231         return false;
 232     }
 233
 234     for (GList const* sel = drag->selected; sel != NULL; sel = sel->next) { // for all selected draggers
 235         GrDragger* dragger = (GrDragger*) sel->data;
 236         for (GSList const* i = dragger->draggables; i != NULL; i = i->next) { // for all draggables of dragger
 237                GrDraggable *draggable = (GrDraggable *) i->data;
 238
 239                drag->local_change = true;
 240                sp_item_gradient_stop_set_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke, stop);
 241         }
 242     }
 243
 244     //sp_repr_css_print(stop);
 245     sp_repr_css_attr_unref(stop);
 246     return true;
 247 }
 248
 249 bool
 250 GrDrag::copy()
 251 {
 252     if (!selected)
 253         return false;
 254
 255     float cf[4];
 256     cf[0] = cf[1] = cf[2] = cf[3] = 0;
 257
 258     int count = 0;
 259
 260     for (GList *i = selected; i != NULL; i = i->next) { // for all selected draggers
 261         GrDragger *d = (GrDragger *) i->data;
 262         for (GSList const* j = d->draggables; j != NULL; j = j->next) { // for all draggables of dragger
 263             GrDraggable *draggable = (GrDraggable *) j->data;
 264
 265             guint32 c = sp_item_gradient_stop_query_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
 266             cf[0] += SP_RGBA32_R_F (c);
 267             cf[1] += SP_RGBA32_G_F (c);
 268             cf[2] += SP_RGBA32_B_F (c);
 269             cf[3] += SP_RGBA32_A_F (c);
 270
 271             count ++;
 272         }
 273     }
 274
 275     if (count) {
 276         cf[0] /= count;
 277         cf[1] /= count;
 278         cf[2] /= count;
 279         cf[3] /= count;
 280     }
 281
 282     guint32 const c32 = SP_RGBA32_F_COMPOSE(cf[0], cf[1], cf[2], cf[3]);
 283     gchar c[64];
 284
 285     SPCSSAttr *css = sp_repr_css_attr_new ();
 286     g_snprintf(c, 64, "#%06x", c32 >> 8);
 287     sp_repr_css_set_property (css, "fill", c);
 288     Inkscape::CSSOStringStream os;
 289     os << cf[3];
 290     sp_repr_css_set_property (css, "opacity", os.str().c_str());
 291     sp_set_style_clipboard (css);
 292
 293     g_snprintf(c, 64, "%06x%02x", c32 >> 8, c32 & 0x000000ff);
 294     Glib::ustring text;
 295     text += c;
 296     if (!text.empty())
 297     {
 298         Glib::RefPtr<Gtk::Clipboard> refClipboard =
 299             Gtk::Clipboard::get();
 300         refClipboard->set_text(text);
 301     }
 302
 303     return true;
 304 }
 305
 306 SPStop *
 307 GrDrag::addStopNearPoint (SPItem *item, NR::Point mouse_p, double tolerance)
 308 {
 309     gfloat offset; // type of SPStop.offset = gfloat
 310     SPGradient *gradient;
 311     bool fill_or_stroke = true;
 312     bool r1_knot = false;
 313
 314     bool addknot = false;
 315     do {
 316         gradient = sp_item_gradient (item, fill_or_stroke);
 317         if (SP_IS_LINEARGRADIENT(gradient)) {
 318             NR::Point begin   = sp_item_gradient_get_coords(item, POINT_LG_BEGIN, 0, fill_or_stroke);
 319             NR::Point end     = sp_item_gradient_get_coords(item, POINT_LG_END, 0, fill_or_stroke);
 320
 321             NR::Point nearest = snap_vector_midpoint (mouse_p, begin, end, 0);
 322             double dist_screen = NR::L2 (mouse_p - nearest);
 323             if ( dist_screen < tolerance ) {
 324                 // add the knot
 325                 offset = get_offset_between_points(nearest, begin, end);
 326                 addknot = true;
 327                 break; // break out of the while loop: add only one knot
 328             }
 329         } else if (SP_IS_RADIALGRADIENT(gradient)) {
 330             NR::Point begin = sp_item_gradient_get_coords(item, POINT_RG_CENTER, 0, fill_or_stroke);
 331             NR::Point end   = sp_item_gradient_get_coords(item, POINT_RG_R1, 0, fill_or_stroke);
 332             NR::Point nearest = snap_vector_midpoint (mouse_p, begin, end, 0);
 333             double dist_screen = NR::L2 (mouse_p - nearest);
 334             if ( dist_screen < tolerance ) {
 335                 offset = get_offset_between_points(nearest, begin, end);
 336                 addknot = true;
 337                 r1_knot = true;
 338                 break; // break out of the while loop: add only one knot
 339             }
 340
 341             end    = sp_item_gradient_get_coords(item, POINT_RG_R2, 0, fill_or_stroke);
 342             nearest = snap_vector_midpoint (mouse_p, begin, end, 0);
 343             dist_screen = NR::L2 (mouse_p - nearest);
 344             if ( dist_screen < tolerance ) {
 345                 offset = get_offset_between_points(nearest, begin, end);
 346                 addknot = true;
 347                 r1_knot = false;
 348                 break; // break out of the while loop: add only one knot
 349             }
 350         }
 351         fill_or_stroke = !fill_or_stroke;
 352     } while (!fill_or_stroke && !addknot) ;
 353
 354     if (addknot) {
 355         SPGradient *vector = sp_gradient_get_forked_vector_if_necessary (gradient, false);
 356         SPStop* prev_stop = sp_first_stop(vector);
 357         SPStop* next_stop = sp_next_stop(prev_stop);
 358         guint i = 1;
 359         while ( (next_stop) && (next_stop->offset < offset) ) {
 360             prev_stop = next_stop;
 361             next_stop = sp_next_stop(next_stop);
 362             i++;
 363         }
 364         if (!next_stop) {
 365             // logical error: the endstop should have offset 1 and should always be more than this offset here
 366             return NULL;
 367         }
 368
 369
 370         SPStop *newstop = sp_vector_add_stop (vector, prev_stop, next_stop, offset);
 371         sp_gradient_ensure_vector (gradient);
 372         updateDraggers();
 373
 374         return newstop;
 375     }
 376
 377     return NULL;
 378 }
 379
 380
 381 bool
 382 GrDrag::dropColor(SPItem *item, gchar *c, NR::Point p)
 383 {
 384     // first, see if we can drop onto one of the existing draggers
 385     for (GList *i = draggers; i != NULL; i = i->next) { // for all draggables of dragger
 386         GrDragger *d = (GrDragger *) i->data;
 387
 388         if (NR::L2(p - d->point)*desktop->current_zoom() < 5) {
 389            SPCSSAttr *stop = sp_repr_css_attr_new ();
 390            sp_repr_css_set_property (stop, "stop-color", c);
 391            sp_repr_css_set_property (stop, "stop-opacity", "1");
 392            for (GSList *j = d->draggables; j != NULL; j = j->next) { // for all draggables of dragger
 393                GrDraggable *draggable = (GrDraggable *) j->data;
 394                local_change = true;
 395                sp_item_gradient_stop_set_style (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke, stop);
 396            }
 397            sp_repr_css_attr_unref(stop);
 398            return true;
 399         }
 400     }
 401
 402     // now see if we're over line and create a new stop
 403     bool over_line = false;
 404     SPCtrlLine *line = NULL;
 405     if (lines) {
 406         for (GSList *l = lines; (l != NULL) && (!over_line); l = l->next) {
 407             line = (SPCtrlLine*) l->data;
 408             NR::Point nearest = snap_vector_midpoint (p, line->s, line->e, 0);
 409             double dist_screen = NR::L2 (p - nearest) * desktop->current_zoom();
 410             if (line->item && dist_screen < 5) {
 411                 SPStop *stop = addStopNearPoint (line->item, p, 5/desktop->current_zoom());
 412                 if (stop) {
 413                     SPCSSAttr *css = sp_repr_css_attr_new ();
 414                     sp_repr_css_set_property (css, "stop-color", c);
 415                     sp_repr_css_set_property (css, "stop-opacity", "1");
 416                     sp_repr_css_change (SP_OBJECT_REPR (stop), css, "style");
 417                     return true;
 418                 }
 419             }
 420         }
 421     }
 422
 423     return false;
 424 }
 425
 426
 427 GrDrag::GrDrag(SPDesktop *desktop) {
 428
 429     this->desktop = desktop;
 430
 431     this->selection = sp_desktop_selection(desktop);
 432
 433     this->draggers = NULL;
 434     this->lines = NULL;
 435     this->selected = NULL;
 436
 437     this->hor_levels.clear();
 438     this->vert_levels.clear();
 439
 440     this->local_change = false;
 441
 442     this->sel_changed_connection = this->selection->connectChanged(
 443         sigc::bind (
 444             sigc::ptr_fun(&gr_drag_sel_changed),
 445             (gpointer)this )
 446
 447         );
 448     this->sel_modified_connection = this->selection->connectModified(
 449         sigc::bind(
 450             sigc::ptr_fun(&gr_drag_sel_modified),
 451             (gpointer)this )
 452         );
 453
 454     this->style_set_connection = this->desktop->connectSetStyle(
 455         sigc::bind(
 456             sigc::ptr_fun(&gr_drag_style_set),
 457             (gpointer)this )
 458         );
 459
 460     this->style_query_connection = this->desktop->connectQueryStyle(
 461         sigc::bind(
 462             sigc::ptr_fun(&gr_drag_style_query),
 463             (gpointer)this )
 464         );
 465
 466     this->updateDraggers ();
 467     this->updateLines ();
 468     this->updateLevels ();
 469
 470     if (desktop->gr_item) {
 471         this->setSelected (getDraggerFor (desktop->gr_item, desktop->gr_point_type, desktop->gr_point_i, desktop->gr_fill_or_stroke));
 472     }
 473 }
 474
 475 GrDrag::~GrDrag()
 476 {
 477     this->sel_changed_connection.disconnect();
 478     this->sel_modified_connection.disconnect();
 479     this->style_set_connection.disconnect();
 480     this->style_query_connection.disconnect();
 481
 482     if (this->selected) {
 483         GrDraggable *draggable = (GrDraggable *)   ((GrDragger*)this->selected->data)->draggables->data;
 484         desktop->gr_item = draggable->item;
 485         desktop->gr_point_type = draggable->point_type;
 486         desktop->gr_point_i = draggable->point_i;
 487         desktop->gr_fill_or_stroke = draggable->fill_or_stroke;
 488     } else {
 489         desktop->gr_item = NULL;
 490         desktop->gr_point_type = 0;
 491         desktop->gr_point_i = 0;
 492         desktop->gr_fill_or_stroke = true;
 493     }
 494
 495     deselect_all();
 496     for (GList *l = this->draggers; l != NULL; l = l->next) {
 497         delete ((GrDragger *) l->data);
 498     }
 499     g_list_free (this->draggers);
 500     this->draggers = NULL;
 501     this->selected = NULL;
 502
 503     for (GSList *l = this->lines; l != NULL; l = l->next) {
 504         gtk_object_destroy( GTK_OBJECT (l->data));
 505     }
 506     g_slist_free (this->lines);
 507     this->lines = NULL;
 508 }
 509
 510 GrDraggable::GrDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke)
 511 {
 512     this->item = item;
 513     this->point_type = point_type;
 514     this->point_i = point_i;
 515     this->fill_or_stroke = fill_or_stroke;
 516
 517     g_object_ref (G_OBJECT (this->item));
 518 }
 519
 520 GrDraggable::~GrDraggable ()
 521 {
 522     g_object_unref (G_OBJECT (this->item));
 523 }
 524
 525
 526 SPObject *
 527 GrDraggable::getServer ()
 528 {
 529     if (!item)
 530         return NULL;
 531
 532     SPObject *server = NULL;
 533     if (fill_or_stroke)
 534         server = SP_OBJECT_STYLE_FILL_SERVER (item);
 535     else
 536         server = SP_OBJECT_STYLE_STROKE_SERVER (item);
 537
 538     return server;
 539 }
 540
 541 static void
 542 gr_knot_moved_handler(SPKnot *knot, NR::Point const *ppointer, guint state, gpointer data)
 543 {
 544     GrDragger *dragger = (GrDragger *) data;
 545     GrDrag *drag = dragger->parent;
 546
 547     NR::Point p = *ppointer;
 548
 549     // FIXME: take from prefs
 550     double snap_dist = SNAP_DIST / dragger->parent->desktop->current_zoom();
 551
 552     if (state & GDK_SHIFT_MASK) {
 553         // with Shift; unsnap if we carry more than one draggable
 554         if (dragger->draggables && dragger->draggables->next) {
 555             // create a new dragger
 556             GrDragger *dr_new = new GrDragger (dragger->parent, dragger->point, NULL);
 557             dragger->parent->draggers = g_list_prepend (dragger->parent->draggers, dr_new);
 558             // relink to it all but the first draggable in the list
 559             for (GSList const* i = dragger->draggables->next; i != NULL; i = i->next) {
 560                 GrDraggable *draggable = (GrDraggable *) i->data;
 561                 dr_new->addDraggable (draggable);
 562             }
 563             dr_new->updateKnotShape();
 564             g_slist_free (dragger->draggables->next);
 565             dragger->draggables->next = NULL;
 566             dragger->updateKnotShape();
 567             dragger->updateTip();
 568         }
 569     } else if (!(state & GDK_CONTROL_MASK)) {
 570         // without Shift or Ctrl; see if we need to snap to another dragger
 571         for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
 572             GrDragger *d_new = (GrDragger *) di->data;
 573             if (dragger->mayMerge(d_new) && NR::L2 (d_new->point - p) < snap_dist) {
 574
 575                 // Merge draggers:
 576                 for (GSList const* i = dragger->draggables; i != NULL; i = i->next) { // for all draggables of dragger
 577                     GrDraggable *draggable = (GrDraggable *) i->data;
 578                     // copy draggable to d_new:
 579                     GrDraggable *da_new = new GrDraggable (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
 580                     d_new->addDraggable (da_new);
 581                 }
 582
 583                 // unlink and delete this dragger
 584                 dragger->parent->draggers = g_list_remove (dragger->parent->draggers, dragger);
 585                 delete dragger;
 586
 587                 // update the new merged dragger
 588                 d_new->fireDraggables(true, false, true);
 589                 d_new->parent->updateLines();
 590                 d_new->parent->setSelected (d_new);
 591                 d_new->updateKnotShape ();
 592                 d_new->updateTip ();
 593                 d_new->updateDependencies(true);
 594                 sp_document_done (sp_desktop_document (d_new->parent->desktop), SP_VERB_CONTEXT_GRADIENT,
 595                                   _("Merge gradient handles"));
 596                 return;
 597             }
 598         }
 599     }
 600
 601     if (!((state & GDK_SHIFT_MASK) || ((state & GDK_CONTROL_MASK) && (state & GDK_MOD1_MASK)))) {
 602         // Try snapping to the grid or guides
 603         SnapManager const &m = dragger->parent->desktop->namedview->snap_manager;
 604         Inkscape::SnappedPoint s = m.freeSnap(Inkscape::Snapper::SNAPPOINT_NODE, p, NULL);
 605         if (s.getDistance() < 1e6) {
 606             p = s.getPoint();
 607             sp_knot_moveto (knot, &p);
 608         } else {
 609             // No snapping so far, let's see if we need to snap to any of the levels
 610             for (guint i = 0; i < dragger->parent->hor_levels.size(); i++) {
 611                 if (fabs(p[NR::Y] - dragger->parent->hor_levels[i]) < snap_dist) {
 612                     p[NR::Y] = dragger->parent->hor_levels[i];
 613                     sp_knot_moveto (knot, &p);
 614                 }
 615             }
 616             for (guint i = 0; i < dragger->parent->vert_levels.size(); i++) {
 617                 if (fabs(p[NR::X] - dragger->parent->vert_levels[i]) < snap_dist) {
 618                     p[NR::X] = dragger->parent->vert_levels[i];
 619                     sp_knot_moveto (knot, &p);
 620                 }
 621             }
 622         }
 623     }
 624
 625     if (state & GDK_CONTROL_MASK) {
 626         unsigned snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 627         /* 0 means no snapping. */
 628
 629         // This list will store snap vectors from all draggables of dragger
 630         GSList *snap_vectors = NULL;
 631
 632         for (GSList const* i = dragger->draggables; i != NULL; i = i->next) {
 633             GrDraggable *draggable = (GrDraggable *) i->data;
 634
 635             NR::Point *dr_snap = NULL;
 636
 637             if (draggable->point_type == POINT_LG_BEGIN || draggable->point_type == POINT_LG_END) {
 638                 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
 639                     GrDragger *d_new = (GrDragger *) di->data;
 640                     if (d_new == dragger)
 641                         continue;
 642                     if (d_new->isA (draggable->item,
 643                                     draggable->point_type == POINT_LG_BEGIN? POINT_LG_END : POINT_LG_BEGIN,
 644                                     draggable->point_i,
 645                                     draggable->fill_or_stroke)) {
 646                         // found the other end of the linear gradient;
 647                         if (state & GDK_SHIFT_MASK) {
 648                             // moving linear around center
 649                             NR::Point center = NR::Point (0.5*(d_new->point + dragger->point));
 650                             dr_snap = &center;
 651                         } else {
 652                             // moving linear around the other end
 653                             dr_snap = &d_new->point;
 654                         }
 655                     }
 656                 }
 657             } else if (draggable->point_type == POINT_RG_R1 || draggable->point_type == POINT_RG_R2 || draggable->point_type == POINT_RG_FOCUS) {
 658                 for (GList *di = dragger->parent->draggers; di != NULL; di = di->next) {
 659                     GrDragger *d_new = (GrDragger *) di->data;
 660                     if (d_new == dragger)
 661                         continue;
 662                     if (d_new->isA (draggable->item,
 663                                     POINT_RG_CENTER,
 664                                     draggable->point_i,
 665                                     draggable->fill_or_stroke)) {
 666                         // found the center of the radial gradient;
 667                         dr_snap = &(d_new->point);
 668                     }
 669                 }
 670             } else if (draggable->point_type == POINT_RG_CENTER) {
 671                 // radial center snaps to hor/vert relative to its original position
 672                 dr_snap = &(dragger->point_original);
 673             }
 674
 675             NR::Point *snap_vector = NULL;
 676             if (dr_snap) {
 677                 if (state & GDK_MOD1_MASK) {
 678                     // with Alt, snap to the original angle and its perpendiculars
 679                     snap_vector = get_snap_vector (p, *dr_snap, M_PI/2, NR::atan2 (dragger->point_original - *dr_snap));
 680                 } else {
 681                     // with Ctrl, snap to M_PI/snaps
 682                     snap_vector = get_snap_vector (p, *dr_snap, M_PI/snaps, 0);
 683                 }
 684             }
 685             if (snap_vector) {
 686                 snap_vectors = g_slist_prepend (snap_vectors, snap_vector);
 687             }
 688         }
 689
 690         // Move by the smallest of snap vectors:
 691         NR::Point move(9999, 9999);
 692         for (GSList const *i = snap_vectors; i != NULL; i = i->next) {
 693             NR::Point *snap_vector = (NR::Point *) i->data;
 694             if (NR::L2(*snap_vector) < NR::L2(move))
 695                 move = *snap_vector;
 696         }
 697         if (move[NR::X] < 9999) {
 698             p += move;
 699             sp_knot_moveto (knot, &p);
 700         }
 701
 702         g_slist_free(snap_vectors);
 703     }
 704
 705     drag->keep_selection = (bool) g_list_find(drag->selected, dragger);
 706     bool scale_radial = (state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK);
 707
 708     if (drag->keep_selection) {
 709         NR::Point diff = p - dragger->point;
 710         drag->selected_move_nowrite (diff[NR::X], diff[NR::Y], scale_radial);
 711     } else {
 712         dragger->point = p;
 713         dragger->fireDraggables (false, scale_radial);
 714         dragger->updateDependencies(false);
 715     }
 716
 717 }
 718
 719
 720 static void
 721 gr_midpoint_limits(GrDragger *dragger, SPObject *server, NR::Point *begin, NR::Point *end, NR::Point *low_lim, NR::Point *high_lim, GSList **moving)
 722 {
 723
 724     GrDrag *drag = dragger->parent;
 725     // a midpoint dragger can (logically) only contain one GrDraggable
 726     GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
 727
 728     // get begin and end points between which dragging is allowed:
 729     // the draglimits are between knot(lowest_i - 1) and knot(highest_i + 1)
 730     *moving = g_slist_append(*moving, dragger);
 731
 732     guint lowest_i = draggable->point_i;
 733     guint highest_i = draggable->point_i;
 734     GrDragger *lowest_dragger = dragger;
 735     GrDragger *highest_dragger = dragger;
 736     if (dragger->isSelected()) {
 737         GrDragger* d_add;
 738         while ( true )
 739         {
 740             d_add = drag->getDraggerFor(draggable->item, draggable->point_type, lowest_i - 1, draggable->fill_or_stroke);
 741             if ( d_add && g_list_find(drag->selected, d_add) ) {
 742                 lowest_i = lowest_i - 1;
 743                 *moving = g_slist_prepend(*moving, d_add);
 744                 lowest_dragger = d_add;
 745             } else {
 746                 break;
 747             }
 748         }
 749
 750         while ( true )
 751         {
 752             d_add = drag->getDraggerFor(draggable->item, draggable->point_type, highest_i + 1, draggable->fill_or_stroke);
 753             if ( d_add && g_list_find(drag->selected, d_add) ) {
 754                 highest_i = highest_i + 1;
 755                 *moving = g_slist_append(*moving, d_add);
 756                 highest_dragger = d_add;
 757             } else {
 758                 break;
 759             }
 760         }
 761     }
 762
 763     if ( SP_IS_LINEARGRADIENT(server) ) {
 764         guint num = SP_LINEARGRADIENT(server)->vector.stops.size();
 765         GrDragger *d_temp;
 766         if (lowest_i == 1) {
 767             d_temp = drag->getDraggerFor (draggable->item, POINT_LG_BEGIN, 0, draggable->fill_or_stroke);
 768         } else {
 769             d_temp = drag->getDraggerFor (draggable->item, POINT_LG_MID, lowest_i - 1, draggable->fill_or_stroke);
 770         }
 771         if (d_temp)
 772             *begin = d_temp->point;
 773
 774         d_temp = drag->getDraggerFor (draggable->item, POINT_LG_MID, highest_i + 1, draggable->fill_or_stroke);
 775         if (d_temp == NULL) {
 776             d_temp = drag->getDraggerFor (draggable->item, POINT_LG_END, num-1, draggable->fill_or_stroke);
 777         }
 778         if (d_temp)
 779             *end = d_temp->point;
 780     } else if ( SP_IS_RADIALGRADIENT(server) ) {
 781         guint num = SP_RADIALGRADIENT(server)->vector.stops.size();
 782         GrDragger *d_temp;
 783         if (lowest_i == 1) {
 784             d_temp = drag->getDraggerFor (draggable->item, POINT_RG_CENTER, 0, draggable->fill_or_stroke);
 785         } else {
 786             d_temp = drag->getDraggerFor (draggable->item, draggable->point_type, lowest_i - 1, draggable->fill_or_stroke);
 787         }
 788         if (d_temp)
 789             *begin = d_temp->point;
 790
 791         d_temp = drag->getDraggerFor (draggable->item, draggable->point_type, highest_i + 1, draggable->fill_or_stroke);
 792         if (d_temp == NULL) {
 793             d_temp = drag->getDraggerFor (draggable->item, (draggable->point_type==POINT_RG_MID1) ? POINT_RG_R1 : POINT_RG_R2, num-1, draggable->fill_or_stroke);
 794         }
 795         if (d_temp)
 796             *end = d_temp->point;
 797     }
 798
 799     *low_lim  = dragger->point - (lowest_dragger->point - *begin);
 800     *high_lim = dragger->point - (highest_dragger->point - *end);
 801 }
 802
 803
 804
 805 /**
 806 Called when a midpoint knot is dragged.
 807 */
 808 static void
 809 gr_knot_moved_midpoint_handler(SPKnot *knot, NR::Point const *ppointer, guint state, gpointer data)
 810 {
 811     GrDragger *dragger = (GrDragger *) data;
 812     GrDrag *drag = dragger->parent;
 813     // a midpoint dragger can (logically) only contain one GrDraggable
 814     GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
 815
 816     // FIXME: take from prefs
 817     double snap_fraction = 0.1;
 818
 819     NR::Point p = *ppointer;
 820     NR::Point begin(0,0), end(0,0);
 821     NR::Point low_lim(0,0), high_lim(0,0);
 822
 823     SPObject *server = draggable->getServer();
 824
 825     GSList *moving = NULL;
 826     gr_midpoint_limits(dragger, server, &begin, &end, &low_lim, &high_lim, &moving);
 827
 828     if (state & GDK_CONTROL_MASK) {
 829         p = snap_vector_midpoint (p, low_lim, high_lim, snap_fraction);
 830     } else {
 831         p = snap_vector_midpoint (p, low_lim, high_lim, 0);
 832     }
 833     NR::Point displacement = p - dragger->point;
 834
 835     for (GSList const* i = moving; i != NULL; i = i->next) {
 836         GrDragger *drg = (GrDragger*) i->data;
 837         SPKnot *drgknot = drg->knot;
 838         NR::Point this_move = displacement;
 839         if (state & GDK_MOD1_MASK) {
 840             // FIXME: unify all these profiles (here, in nodepath, in tweak) in one place
 841             double alpha = 1.5;
 842             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
 843                 double x = NR::L2(drg->point - dragger->point)/NR::L2(end - dragger->point);
 844                 this_move = (0.5 * cos (M_PI * (pow(x, alpha))) + 0.5) * this_move;
 845             } else { // drg is on the begin side from dragger
 846                 double x = NR::L2(drg->point - dragger->point)/NR::L2(begin - dragger->point);
 847                 this_move = (0.5 * cos (M_PI * (pow(x, alpha))) + 0.5) * this_move;
 848             }
 849         }
 850         drg->point += this_move;
 851         sp_knot_moveto (drgknot, & drg->point);
 852         drg->fireDraggables (false);
 853         drg->updateDependencies(false);
 854     }
 855
 856     g_slist_free(moving);
 857
 858     drag->keep_selection = dragger->isSelected();
 859 }
 860
 861
 862
 863 static void
 864 gr_knot_grabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
 865 {
 866     GrDragger *dragger = (GrDragger *) data;
 867
 868     sp_canvas_force_full_redraw_after_interruptions(dragger->parent->desktop->canvas, 5);
 869 }
 870
 871 /**
 872 Called when the mouse releases a dragger knot; changes gradient writing to repr, updates other draggers if needed
 873 */
 874 static void
 875 gr_knot_ungrabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
 876 {
 877     GrDragger *dragger = (GrDragger *) data;
 878
 879     sp_canvas_end_forced_full_redraws(dragger->parent->desktop->canvas);
 880
 881     dragger->point_original = dragger->point = knot->pos;
 882
 883     if ((state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK)) {
 884         dragger->fireDraggables (true, true);
 885     } else {
 886         dragger->fireDraggables (true);
 887     }
 888
 889     for (GList *i = dragger->parent->selected; i != NULL; i = i->next) {
 890         GrDragger *d = (GrDragger *) i->data;
 891         if (d == dragger)
 892             continue;
 893         d->fireDraggables (true);
 894     }
 895
 896     // make this dragger selected
 897     if (!dragger->parent->keep_selection) {
 898         dragger->parent->setSelected (dragger);
 899     }
 900     dragger->parent->keep_selection = false;
 901
 902     dragger->updateDependencies(true);
 903
 904     // we did an undoable action
 905     sp_document_done (sp_desktop_document (dragger->parent->desktop), SP_VERB_CONTEXT_GRADIENT,
 906                       _("Move gradient handle"));
 907 }
 908
 909 /**
 910 Called when a dragger knot is clicked; selects the dragger or deletes it depending on the
 911 state of the keyboard keys
 912 */
 913 static void
 914 gr_knot_clicked_handler(SPKnot *knot, guint state, gpointer data)
 915 {
 916     GrDragger *dragger = (GrDragger *) data;
 917     GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
 918     if (!draggable) return;
 919
 920     if ( (state & GDK_CONTROL_MASK) && (state & GDK_MOD1_MASK ) ) {
 921     // delete this knot from vector
 922         SPGradient *gradient = sp_item_gradient (draggable->item, draggable->fill_or_stroke);
 923         gradient = sp_gradient_get_vector (gradient, false);
 924         if (gradient->vector.stops.size() > 2) { // 2 is the minimum
 925                 SPStop *stop = NULL;
 926                 switch (draggable->point_type) {  // if we delete first or last stop, move the next/previous to the edge
 927                 case POINT_LG_BEGIN:
 928                 case POINT_RG_CENTER:
 929                     stop = sp_first_stop(gradient);
 930                         {
 931                             SPStop *next = sp_next_stop (stop);
 932                                 if (next) {
 933                                         next->offset = 0;
 934                                         sp_repr_set_css_double (SP_OBJECT_REPR (next), "offset", 0);
 935                                 }
 936                         }
 937                     break;
 938                 case POINT_LG_END:
 939                 case POINT_RG_R1:
 940                 case POINT_RG_R2:
 941                     stop = sp_last_stop(gradient);
 942                     {
 943                             SPStop *prev = sp_prev_stop (stop, gradient);
 944                             if (prev) {
 945                                     prev->offset = 1;
 946                                     sp_repr_set_css_double (SP_OBJECT_REPR (prev), "offset", 1);
 947                             }
 948                         }
 949                     break;
 950                 case POINT_LG_MID:
 951                 case POINT_RG_MID1:
 952                 case POINT_RG_MID2:
 953                     stop = sp_get_stop_i(gradient, draggable->point_i);
 954                     break;
 955                 }
 956
 957                 SP_OBJECT_REPR(gradient)->removeChild(SP_OBJECT_REPR(stop));
 958                 sp_document_done (SP_OBJECT_DOCUMENT (gradient), SP_VERB_CONTEXT_GRADIENT,
 959                                   _("Delete gradient stop"));
 960         }
 961     } else {
 962     // select the dragger
 963         dragger->point_original = dragger->point;
 964
 965         if ( state & GDK_SHIFT_MASK ) {
 966             dragger->parent->setSelected (dragger, true, false);
 967         } else {
 968             dragger->parent->setSelected (dragger);
 969         }
 970     }
 971 }
 972
 973 /**
 974 Called when a dragger knot is doubleclicked; opens gradient editor with the stop from the first draggable
 975 */
 976 static void
 977 gr_knot_doubleclicked_handler (SPKnot *knot, guint state, gpointer data)
 978 {
 979     GrDragger *dragger = (GrDragger *) data;
 980
 981     dragger->point_original = dragger->point;
 982
 983     if (dragger->draggables == NULL)
 984         return;
 985
 986     GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
 987     sp_item_gradient_edit_stop (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
 988 }
 989
 990 /**
 991 Act upon all draggables of the dragger, setting them to the dragger's point
 992 */
 993 void
 994 GrDragger::fireDraggables (bool write_repr, bool scale_radial, bool merging_focus)
 995 {
 996     for (GSList const* i = this->draggables; i != NULL; i = i->next) {
 997         GrDraggable *draggable = (GrDraggable *) i->data;
 998
 999         // set local_change flag so that selection_changed callback does not regenerate draggers
1000         this->parent->local_change = true;
1001
1002         // change gradient, optionally writing to repr; prevent focus from moving if it's snapped
1003         // to the center, unless it's the first update upon merge when we must snap it to the point
1004         if (merging_focus ||
1005             !(draggable->point_type == POINT_RG_FOCUS && this->isA(draggable->item, POINT_RG_CENTER, draggable->point_i, draggable->fill_or_stroke)))
1006         {
1007             sp_item_gradient_set_coords (draggable->item, draggable->point_type, draggable->point_i, this->point, draggable->fill_or_stroke, write_repr, scale_radial);
1008         }
1009     }
1010 }
1011
1012 /**
1013 Checks if the dragger has a draggable with this point_type
1014  */
1015 bool
1016 GrDragger::isA (gint point_type)
1017 {
1018     for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1019         GrDraggable *draggable = (GrDraggable *) i->data;
1020         if (draggable->point_type == point_type) {
1021             return true;
1022         }
1023     }
1024     return false;
1025 }
1026
1027 /**
1028 Checks if the dragger has a draggable with this item, point_type, fill_or_stroke
1029  */
1030 bool
1031 GrDragger::isA (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke)
1032 {
1033     for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1034         GrDraggable *draggable = (GrDraggable *) i->data;
1035         if ( (draggable->point_type == point_type) && (draggable->point_i == point_i) && (draggable->item == item) && (draggable->fill_or_stroke == fill_or_stroke) ) {
1036             return true;
1037         }
1038     }
1039     return false;
1040 }
1041
1042 bool
1043 GrDraggable::mayMerge (GrDraggable *da2)
1044 {
1045     if ((this->item == da2->item) && (this->fill_or_stroke == da2->fill_or_stroke)) {
1046         // we must not merge the points of the same gradient!
1047         if (!((this->point_type == POINT_RG_FOCUS && da2->point_type == POINT_RG_CENTER) ||
1048               (this->point_type == POINT_RG_CENTER && da2->point_type == POINT_RG_FOCUS))) {
1049             // except that we can snap center and focus together
1050             return false;
1051         }
1052     }
1053     // disable merging of midpoints.
1054     if ( (this->point_type == POINT_LG_MID) || (da2->point_type == POINT_LG_MID)
1055          || (this->point_type == POINT_RG_MID1) || (da2->point_type == POINT_RG_MID1)
1056          || (this->point_type == POINT_RG_MID2) || (da2->point_type == POINT_RG_MID2) )
1057         return false;
1058
1059     return true;
1060 }
1061
1062 bool
1063 GrDragger::mayMerge (GrDragger *other)
1064 {
1065     if (this == other)
1066         return false;
1067
1068     for (GSList const* i = this->draggables; i != NULL; i = i->next) { // for all draggables of this
1069         GrDraggable *da1 = (GrDraggable *) i->data;
1070         for (GSList const* j = other->draggables; j != NULL; j = j->next) { // for all draggables of other
1071             GrDraggable *da2 = (GrDraggable *) j->data;
1072             if (!da1->mayMerge(da2))
1073                 return false;
1074         }
1075     }
1076     return true;
1077 }
1078
1079 bool
1080 GrDragger::mayMerge (GrDraggable *da2)
1081 {
1082     for (GSList const* i = this->draggables; i != NULL; i = i->next) { // for all draggables of this
1083         GrDraggable *da1 = (GrDraggable *) i->data;
1084         if (!da1->mayMerge(da2))
1085             return false;
1086     }
1087     return true;
1088 }
1089
1090 /**
1091 Updates the statusbar tip of the dragger knot, based on its draggables
1092  */
1093 void
1094 GrDragger::updateTip ()
1095 {
1096         if (this->knot && this->knot->tip) {
1097                 g_free (this->knot->tip);
1098                 this->knot->tip = NULL;
1099         }
1100
1101     if (g_slist_length (this->draggables) == 1) {
1102         GrDraggable *draggable = (GrDraggable *) this->draggables->data;
1103         char *item_desc = sp_item_description(draggable->item);
1104         switch (draggable->point_type) {
1105             case POINT_LG_MID:
1106             case POINT_RG_MID1:
1107             case POINT_RG_MID2:
1108                 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"),
1109                                                    _(gr_knot_descr[draggable->point_type]),
1110                                                    draggable->point_i,
1111                                                    item_desc,
1112                                                    draggable->fill_or_stroke == false ? _(" (stroke)") : "");
1113                 break;
1114
1115             default:
1116                 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"),
1117                                                    _(gr_knot_descr[draggable->point_type]),
1118                                                    item_desc,
1119                                                    draggable->fill_or_stroke == false ? _(" (stroke)") : "");
1120                 break;
1121         }
1122         g_free(item_desc);
1123     } else if (g_slist_length (draggables) == 2 && isA (POINT_RG_CENTER) && isA (POINT_RG_FOCUS)) {
1124         this->knot->tip = g_strdup_printf (_("Radial gradient <b>center</b> and <b>focus</b>; drag with <b>Shift</b> to separate focus"));
1125     } else {
1126         int length = g_slist_length (this->draggables);
1127         this->knot->tip = g_strdup_printf (ngettext("Gradient point shared by <b>%d</b> gradient; drag with <b>Shift</b> to separate",
1128                                                     "Gradient point shared by <b>%d</b> gradients; drag with <b>Shift</b> to separate",
1129                                                     length),
1130                                            length);
1131     }
1132 }
1133
1134 /**
1135 Adds a draggable to the dragger
1136  */
1137 void
1138 GrDragger::updateKnotShape ()
1139 {
1140     if (!draggables)
1141         return;
1142     GrDraggable *last = (GrDraggable *) g_slist_last(draggables)->data;
1143     g_object_set (G_OBJECT (this->knot->item), "shape", gr_knot_shapes[last->point_type], NULL);
1144 }
1145
1146 /**
1147 Adds a draggable to the dragger
1148  */
1149 void
1150 GrDragger::addDraggable (GrDraggable *draggable)
1151 {
1152     this->draggables = g_slist_prepend (this->draggables, draggable);
1153
1154     this->updateTip();
1155 }
1156
1157
1158 /**
1159 Moves this dragger to the point of the given draggable, acting upon all other draggables
1160  */
1161 void
1162 GrDragger::moveThisToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr)
1163 {
1164     this->point = sp_item_gradient_get_coords (item, point_type, point_i, fill_or_stroke);
1165     this->point_original = this->point;
1166
1167     sp_knot_moveto (this->knot, &(this->point));
1168
1169     for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1170         GrDraggable *da = (GrDraggable *) i->data;
1171         if ( (da->item == item) &&
1172              (point_type == -1 || da->point_type == point_type) &&
1173              (point_i == -1 || da->point_i == point_i) &&
1174              (da->fill_or_stroke == fill_or_stroke) ) {
1175             continue;
1176         }
1177         sp_item_gradient_set_coords (da->item, da->point_type, da->point_i, this->point, da->fill_or_stroke, write_repr, false);
1178     }
1179     // FIXME: here we should also call this->updateDependencies(write_repr); to propagate updating, but how to prevent loops?
1180 }
1181
1182
1183 /**
1184 Moves all midstop draggables that depend on this one
1185  */
1186 void
1187 GrDragger::updateMidstopDependencies (GrDraggable *draggable, bool write_repr) {
1188     SPObject *server = draggable->getServer();
1189     if (!server)
1190         return;
1191     guint num = SP_GRADIENT(server)->vector.stops.size();
1192     if (num <= 2) return;
1193
1194     if ( SP_IS_LINEARGRADIENT(server) ) {
1195         for ( guint i = 1; i < num - 1; i++ ) {
1196             this->moveOtherToDraggable (draggable->item, POINT_LG_MID, i, draggable->fill_or_stroke, write_repr);
1197         }
1198     } else  if ( SP_IS_RADIALGRADIENT(server) ) {
1199         for ( guint i = 1; i < num - 1; i++ ) {
1200             this->moveOtherToDraggable (draggable->item, POINT_RG_MID1, i, draggable->fill_or_stroke, write_repr);
1201             this->moveOtherToDraggable (draggable->item, POINT_RG_MID2, i, draggable->fill_or_stroke, write_repr);
1202         }
1203     }
1204 }
1205
1206
1207 /**
1208 Moves all draggables that depend on this one
1209  */
1210 void
1211 GrDragger::updateDependencies (bool write_repr)
1212 {
1213     for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1214         GrDraggable *draggable = (GrDraggable *) i->data;
1215         switch (draggable->point_type) {
1216             case POINT_LG_BEGIN:
1217                 {
1218                     // the end point is dependent only when dragging with ctrl+shift
1219                     this->moveOtherToDraggable (draggable->item, POINT_LG_END, -1, draggable->fill_or_stroke, write_repr);
1220
1221                     this->updateMidstopDependencies (draggable, write_repr);
1222                 }
1223                 break;
1224             case POINT_LG_END:
1225                 {
1226                     // the begin point is dependent only when dragging with ctrl+shift
1227                     this->moveOtherToDraggable (draggable->item, POINT_LG_BEGIN, 0, draggable->fill_or_stroke, write_repr);
1228
1229                     this->updateMidstopDependencies (draggable, write_repr);
1230                 }
1231                 break;
1232             case POINT_LG_MID:
1233                 // no other nodes depend on mid points.
1234                 break;
1235             case POINT_RG_R2:
1236                 this->moveOtherToDraggable (draggable->item, POINT_RG_R1, -1, draggable->fill_or_stroke, write_repr);
1237                 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, -1, draggable->fill_or_stroke, write_repr);
1238                 this->updateMidstopDependencies (draggable, write_repr);
1239                 break;
1240             case POINT_RG_R1:
1241                 this->moveOtherToDraggable (draggable->item, POINT_RG_R2, -1, draggable->fill_or_stroke, write_repr);
1242                 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, -1, draggable->fill_or_stroke, write_repr);
1243                 this->updateMidstopDependencies (draggable, write_repr);
1244                 break;
1245             case POINT_RG_CENTER:
1246                 this->moveOtherToDraggable (draggable->item, POINT_RG_R1, -1, draggable->fill_or_stroke, write_repr);
1247                 this->moveOtherToDraggable (draggable->item, POINT_RG_R2, -1, draggable->fill_or_stroke, write_repr);
1248                 this->moveOtherToDraggable (draggable->item, POINT_RG_FOCUS, -1, draggable->fill_or_stroke, write_repr);
1249                 this->updateMidstopDependencies (draggable, write_repr);
1250                 break;
1251             case POINT_RG_FOCUS:
1252                 // nothing can depend on that
1253                 break;
1254             case POINT_RG_MID1:
1255                 this->moveOtherToDraggable (draggable->item, POINT_RG_MID2, draggable->point_i, draggable->fill_or_stroke, write_repr);
1256                 break;
1257             case POINT_RG_MID2:
1258                 this->moveOtherToDraggable (draggable->item, POINT_RG_MID1, draggable->point_i, draggable->fill_or_stroke, write_repr);
1259                 break;
1260             default:
1261                 break;
1262         }
1263     }
1264 }
1265
1266
1267
1268 GrDragger::GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable)
1269 {
1270     this->draggables = NULL;
1271
1272     this->parent = parent;
1273
1274     this->point = p;
1275     this->point_original = p;
1276
1277     // create the knot
1278     this->knot = sp_knot_new (parent->desktop, NULL);
1279     this->knot->setMode(SP_KNOT_MODE_XOR);
1280     this->knot->setFill(GR_KNOT_COLOR_NORMAL, GR_KNOT_COLOR_MOUSEOVER, GR_KNOT_COLOR_MOUSEOVER);
1281     this->knot->setStroke(0x000000ff, 0x000000ff, 0x000000ff);
1282     sp_knot_update_ctrl(this->knot);
1283
1284     // move knot to the given point
1285     sp_knot_set_position (this->knot, &p, SP_KNOT_STATE_NORMAL);
1286     sp_knot_show (this->knot);
1287
1288     // connect knot's signals
1289     if ( (draggable)  // it can be NULL if a node in unsnapped (eg. focus point unsnapped from center)
1290                        // luckily, midstops never snap to other nodes so are never unsnapped...
1291          && ( (draggable->point_type == POINT_LG_MID)
1292               || (draggable->point_type == POINT_RG_MID1)
1293               || (draggable->point_type == POINT_RG_MID2) ) )
1294     {
1295         this->handler_id = g_signal_connect (G_OBJECT (this->knot), "moved", G_CALLBACK (gr_knot_moved_midpoint_handler), this);
1296     } else {
1297         this->handler_id = g_signal_connect (G_OBJECT (this->knot), "moved", G_CALLBACK (gr_knot_moved_handler), this);
1298     }
1299     g_signal_connect (G_OBJECT (this->knot), "clicked", G_CALLBACK (gr_knot_clicked_handler), this);
1300     g_signal_connect (G_OBJECT (this->knot), "doubleclicked", G_CALLBACK (gr_knot_doubleclicked_handler), this);
1301     g_signal_connect (G_OBJECT (this->knot), "grabbed", G_CALLBACK (gr_knot_grabbed_handler), this);
1302     g_signal_connect (G_OBJECT (this->knot), "ungrabbed", G_CALLBACK (gr_knot_ungrabbed_handler), this);
1303
1304     // add the initial draggable
1305     if (draggable)
1306         this->addDraggable (draggable);
1307     updateKnotShape();
1308 }
1309
1310 GrDragger::~GrDragger ()
1311 {
1312     // unselect if it was selected
1313     this->parent->setDeselected(this);
1314
1315     // disconnect signals
1316     g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_moved_handler), this);
1317     g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_clicked_handler), this);
1318     g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_doubleclicked_handler), this);
1319     g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_grabbed_handler), this);
1320     g_signal_handlers_disconnect_by_func(G_OBJECT(this->knot), (gpointer) G_CALLBACK (gr_knot_ungrabbed_handler), this);
1321
1322     /* unref should call destroy */
1323     g_object_unref (G_OBJECT (this->knot));
1324
1325     // delete all draggables
1326     for (GSList const* i = this->draggables; i != NULL; i = i->next) {
1327         delete ((GrDraggable *) i->data);
1328     }
1329     g_slist_free (this->draggables);
1330     this->draggables = NULL;
1331 }
1332
1333 /**
1334 Select the dragger which has the given draggable.
1335 */
1336 GrDragger *
1337 GrDrag::getDraggerFor (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke)
1338 {
1339     for (GList const* i = this->draggers; i != NULL; i = i->next) {
1340         GrDragger *dragger = (GrDragger *) i->data;
1341         for (GSList const* j = dragger->draggables; j != NULL; j = j->next) {
1342             GrDraggable *da2 = (GrDraggable *) j->data;
1343             if ( (da2->item == item) &&
1344                  (point_type == -1 || da2->point_type == point_type) && // -1 means this does not matter
1345                  (point_i == -1 || da2->point_i == point_i) && // -1 means this does not matter
1346                  (da2->fill_or_stroke == fill_or_stroke)) {
1347                 return (dragger);
1348             }
1349         }
1350     }
1351     return NULL;
1352 }
1353
1354
1355 void
1356 GrDragger::moveOtherToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr)
1357 {
1358     GrDragger *d = this->parent->getDraggerFor (item, point_type, point_i, fill_or_stroke);
1359     if (d && d !=  this) {
1360         d->moveThisToDraggable (item, point_type, point_i, fill_or_stroke, write_repr);
1361     }
1362 }
1363
1364
1365 /**
1366   Draw this dragger as selected
1367 */
1368 void
1369 GrDragger::select()
1370 {
1371     this->knot->fill [SP_KNOT_STATE_NORMAL] = GR_KNOT_COLOR_SELECTED;
1372     g_object_set (G_OBJECT (this->knot->item), "fill_color", GR_KNOT_COLOR_SELECTED, NULL);
1373 }
1374
1375 /**
1376   Draw this dragger as normal (deselected)
1377 */
1378 void
1379 GrDragger::deselect()
1380 {
1381     this->knot->fill [SP_KNOT_STATE_NORMAL] = GR_KNOT_COLOR_NORMAL;
1382     g_object_set (G_OBJECT (this->knot->item), "fill_color", GR_KNOT_COLOR_NORMAL, NULL);
1383 }
1384
1385 bool
1386 GrDragger::isSelected()
1387 {
1388     return g_list_find (parent->selected, this);
1389 }
1390
1391 /**
1392 \brief Deselect all stops/draggers (private)
1393 */
1394 void
1395 GrDrag::deselect_all()
1396 {
1397     while (selected) {
1398         ( (GrDragger*) selected->data)->deselect();
1399         selected = g_list_remove(selected, selected->data);
1400     }
1401 }
1402
1403 /**
1404 \brief Deselect all stops/draggers (public; emits signal)
1405 */
1406 void
1407 GrDrag::deselectAll()
1408 {
1409     deselect_all();
1410     this->desktop->emitToolSubselectionChanged(NULL);
1411 }
1412
1413 /**
1414 \brief Select all stops/draggers
1415 */
1416 void
1417 GrDrag::selectAll()
1418 {
1419     for (GList *l = this->draggers; l != NULL; l = l->next) {
1420         GrDragger *d = ((GrDragger *) l->data);
1421         setSelected (d, true, true);
1422     }
1423 }
1424
1425 /**
1426 \brief Select all stops/draggers that match the coords
1427 */
1428 void
1429 GrDrag::selectByCoords(std::vector<NR::Point> coords)
1430 {
1431     for (GList *l = this->draggers; l != NULL; l = l->next) {
1432         GrDragger *d = ((GrDragger *) l->data);
1433         for (guint k = 0; k < coords.size(); k++) {
1434             if (NR::L2 (d->point - coords[k]) < 1e-4) {
1435                 setSelected (d, true, true);
1436             }
1437         }
1438     }
1439 }
1440
1441
1442 /**
1443 \brief Select all stops/draggers that fall within the rect
1444 */
1445 void
1446 GrDrag::selectRect(NR::Rect const &r)
1447 {
1448     for (GList *l = this->draggers; l != NULL; l = l->next) {
1449         GrDragger *d = ((GrDragger *) l->data);
1450         if (r.contains(d->point)) {
1451            setSelected (d, true, true);
1452         }
1453     }
1454 }
1455
1456 /**
1457 \brief Select a dragger
1458 \param dragger       The dragger to select
1459 \param add_to_selection   If true, add to selection, otherwise deselect others
1460 \param override      If true, always select this node, otherwise toggle selected status
1461 */
1462 void
1463 GrDrag::setSelected (GrDragger *dragger, bool add_to_selection, bool override)
1464 {
1465     GrDragger *seldragger = NULL;
1466
1467     if (add_to_selection) {
1468         if (!dragger) return;
1469         if (override) {
1470             if (!g_list_find(selected, dragger)) {
1471                 selected = g_list_prepend(selected, dragger);
1472             }
1473             dragger->select();
1474             seldragger = dragger;
1475         } else { // toggle
1476             if (g_list_find(selected, dragger)) {
1477                 selected = g_list_remove(selected, dragger);
1478                 dragger->deselect();
1479                 if (selected) {
1480                     seldragger = (GrDragger*) selected->data; // select the dragger that is first in the list
1481                 }
1482             } else {
1483                 selected = g_list_prepend(selected, dragger);
1484                 dragger->select();
1485                 seldragger = dragger;
1486             }
1487         }
1488     } else {
1489         deselect_all();
1490         if (dragger) {
1491             selected = g_list_prepend(selected, dragger);
1492             dragger->select();
1493             seldragger = dragger;
1494         }
1495     }
1496     if (seldragger) {
1497         this->desktop->emitToolSubselectionChanged((gpointer) seldragger);
1498     }
1499 }
1500
1501 /**
1502 \brief Deselect a dragger
1503 \param dragger       The dragger to deselect
1504 */
1505 void
1506 GrDrag::setDeselected (GrDragger *dragger)
1507 {
1508     if (g_list_find(selected, dragger)) {
1509         selected = g_list_remove(selected, dragger);
1510         dragger->deselect();
1511     }
1512     this->desktop->emitToolSubselectionChanged((gpointer) (selected ? selected->data : NULL ));
1513 }
1514
1515
1516
1517 /**
1518 Create a line from p1 to p2 and add it to the lines list
1519  */
1520 void
1521 GrDrag::addLine (SPItem *item, NR::Point p1, NR::Point p2, guint32 rgba)
1522 {
1523     SPCanvasItem *line = sp_canvas_item_new(sp_desktop_controls(this->desktop),
1524                                                             SP_TYPE_CTRLLINE, NULL);
1525     SP_CTRLLINE(line)->item = item;
1526     sp_ctrlline_set_coords(SP_CTRLLINE(line), p1, p2);
1527     if (rgba != GR_LINE_COLOR_FILL) // fill is the default, so don't set color for it to speed up redraw
1528         sp_ctrlline_set_rgba32 (SP_CTRLLINE(line), rgba);
1529     sp_canvas_item_show (line);
1530     this->lines = g_slist_append (this->lines, line);
1531 }
1532
1533 /**
1534 If there already exists a dragger within MERGE_DIST of p, add the draggable to it; otherwise create
1535 new dragger and add it to draggers list
1536  */
1537 void
1538 GrDrag::addDragger (GrDraggable *draggable)
1539 {
1540     NR::Point p = sp_item_gradient_get_coords (draggable->item, draggable->point_type, draggable->point_i, draggable->fill_or_stroke);
1541
1542     for (GList *i = this->draggers; i != NULL; i = i->next) {
1543         GrDragger *dragger = (GrDragger *) i->data;
1544         if (dragger->mayMerge (draggable) && NR::L2 (dragger->point - p) < MERGE_DIST) {
1545             // distance is small, merge this draggable into dragger, no need to create new dragger
1546             dragger->addDraggable (draggable);
1547             dragger->updateKnotShape();
1548             return;
1549         }
1550     }
1551
1552     GrDragger *new_dragger = new GrDragger(this, p, draggable);
1553     // fixme: draggers should be added AFTER the last one: this way tabbing through them will be from begin to end.
1554     this->draggers = g_list_append (this->draggers, new_dragger);
1555 }
1556
1557 /**
1558 Add draggers for the radial gradient rg on item
1559 */
1560 void
1561 GrDrag::addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke)
1562 {
1563     addDragger (new GrDraggable (item, POINT_RG_CENTER, 0, fill_or_stroke));
1564     guint num = rg->vector.stops.size();
1565     if (num > 2) {
1566         for ( guint i = 1; i < num - 1; i++ ) {
1567             addDragger (new GrDraggable (item, POINT_RG_MID1, i, fill_or_stroke));
1568         }
1569     }
1570     addDragger (new GrDraggable (item, POINT_RG_R1, num-1, fill_or_stroke));
1571     if (num > 2) {
1572         for ( guint i = 1; i < num - 1; i++ ) {
1573             addDragger (new GrDraggable (item, POINT_RG_MID2, i, fill_or_stroke));
1574         }
1575     }
1576     addDragger (new GrDraggable (item, POINT_RG_R2, num-1, fill_or_stroke));
1577     addDragger (new GrDraggable (item, POINT_RG_FOCUS, 0, fill_or_stroke));
1578 }
1579
1580 /**
1581 Add draggers for the linear gradient lg on item
1582 */
1583 void
1584 GrDrag::addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke)
1585 {
1586     addDragger (new GrDraggable (item, POINT_LG_BEGIN, 0, fill_or_stroke));
1587     guint num = lg->vector.stops.size();
1588     if (num > 2) {
1589         for ( guint i = 1; i < num - 1; i++ ) {
1590             addDragger (new GrDraggable (item, POINT_LG_MID, i, fill_or_stroke));
1591         }
1592     }
1593     addDragger (new GrDraggable (item, POINT_LG_END, num-1, fill_or_stroke));
1594 }
1595
1596 /**
1597 Artificially grab the knot of this dragger; used by the gradient context
1598 */
1599 void
1600 GrDrag::grabKnot (GrDragger *dragger, gint x, gint y, guint32 etime)
1601 {
1602     if (dragger) {
1603         sp_knot_start_dragging (dragger->knot, dragger->point, x, y, etime);
1604     }
1605 }
1606
1607 /**
1608 Artificially grab the knot of the dragger with this draggable; used by the gradient context
1609 */
1610 void
1611 GrDrag::grabKnot (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime)
1612 {
1613     GrDragger *dragger = getDraggerFor (item, point_type, point_i, fill_or_stroke);
1614     if (dragger) {
1615         sp_knot_start_dragging (dragger->knot, dragger->point, x, y, etime);
1616     }
1617 }
1618
1619 /**
1620 Regenerates the draggers list from the current selection; is called when selection is changed or
1621 modified, also when a radial dragger needs to update positions of other draggers in the gradient
1622 */
1623 void
1624 GrDrag::updateDraggers ()
1625 {
1626     while (selected) {
1627         selected = g_list_remove(selected, selected->data);
1628     }
1629     // delete old draggers
1630     for (GList const* i = this->draggers; i != NULL; i = i->next) {
1631         delete ((GrDragger *) i->data);
1632     }
1633     g_list_free (this->draggers);
1634     this->draggers = NULL;
1635
1636     g_return_if_fail (this->selection != NULL);
1637
1638     for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1639
1640         SPItem *item = SP_ITEM(i->data);
1641         SPStyle *style = SP_OBJECT_STYLE (item);
1642
1643         if (style && (style->fill.isPaintserver())) {
1644             SPObject *server = SP_OBJECT_STYLE_FILL_SERVER (item);
1645             if (SP_IS_LINEARGRADIENT (server)) {
1646                 addDraggersLinear (SP_LINEARGRADIENT (server), item, true);
1647             } else if (SP_IS_RADIALGRADIENT (server)) {
1648                 addDraggersRadial (SP_RADIALGRADIENT (server), item, true);
1649             }
1650         }
1651
1652         if (style && (style->stroke.isPaintserver())) {
1653             SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER (item);
1654             if (SP_IS_LINEARGRADIENT (server)) {
1655                 addDraggersLinear (SP_LINEARGRADIENT (server), item, false);
1656             } else if (SP_IS_RADIALGRADIENT (server)) {
1657                 addDraggersRadial (SP_RADIALGRADIENT (server), item, false);
1658             }
1659         }
1660     }
1661 }
1662
1663 /**
1664 Regenerates the lines list from the current selection; is called on each move of a dragger, so that
1665 lines are always in sync with the actual gradient
1666 */
1667 void
1668 GrDrag::updateLines ()
1669 {
1670     // delete old lines
1671     for (GSList const *i = this->lines; i != NULL; i = i->next) {
1672         gtk_object_destroy( GTK_OBJECT (i->data));
1673     }
1674     g_slist_free (this->lines);
1675     this->lines = NULL;
1676
1677     g_return_if_fail (this->selection != NULL);
1678
1679     for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1680
1681         SPItem *item = SP_ITEM(i->data);
1682
1683         SPStyle *style = SP_OBJECT_STYLE (item);
1684
1685         if (style && (style->fill.isPaintserver())) {
1686             SPObject *server = SP_OBJECT_STYLE_FILL_SERVER (item);
1687             if (SP_IS_LINEARGRADIENT (server)) {
1688                 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);
1689             } else if (SP_IS_RADIALGRADIENT (server)) {
1690                 NR::Point center = sp_item_gradient_get_coords (item, POINT_RG_CENTER, 0, true);
1691                 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R1, 0, true), GR_LINE_COLOR_FILL);
1692                 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R2, 0, true), GR_LINE_COLOR_FILL);
1693             }
1694         }
1695
1696         if (style && (style->stroke.isPaintserver())) {
1697             SPObject *server = SP_OBJECT_STYLE_STROKE_SERVER (item);
1698             if (SP_IS_LINEARGRADIENT (server)) {
1699                 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);
1700             } else if (SP_IS_RADIALGRADIENT (server)) {
1701                 NR::Point center = sp_item_gradient_get_coords (item, POINT_RG_CENTER, 0, false);
1702                 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R1, 0, false), GR_LINE_COLOR_STROKE);
1703                 this->addLine (item, center, sp_item_gradient_get_coords (item, POINT_RG_R2, 0, false), GR_LINE_COLOR_STROKE);
1704             }
1705         }
1706     }
1707 }
1708
1709 /**
1710 Regenerates the levels list from the current selection
1711 */
1712 void
1713 GrDrag::updateLevels ()
1714 {
1715     hor_levels.clear();
1716     vert_levels.clear();
1717
1718     g_return_if_fail (this->selection != NULL);
1719
1720     for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1721         SPItem *item = SP_ITEM(i->data);
1722         NR::Maybe<NR::Rect> rect = sp_item_bbox_desktop (item);
1723         if (rect) {
1724             // Remember the edges of the bbox and the center axis
1725             hor_levels.push_back(rect->min()[NR::Y]);
1726             hor_levels.push_back(rect->max()[NR::Y]);
1727             hor_levels.push_back(0.5 * (rect->min()[NR::Y] + rect->max()[NR::Y]));
1728             vert_levels.push_back(rect->min()[NR::X]);
1729             vert_levels.push_back(rect->max()[NR::X]);
1730             vert_levels.push_back(0.5 * (rect->min()[NR::X] + rect->max()[NR::X]));
1731         }
1732     }
1733 }
1734
1735 void
1736 GrDrag::selected_reverse_vector ()
1737 {
1738     if (selected == NULL)
1739         return;
1740
1741     for (GSList const* i = ( (GrDragger*) selected->data )->draggables; i != NULL; i = i->next) {
1742         GrDraggable *draggable = (GrDraggable *) i->data;
1743
1744         sp_item_gradient_reverse_vector (draggable->item, draggable->fill_or_stroke);
1745     }
1746 }
1747
1748 void
1749 GrDrag::selected_move_nowrite (double x, double y, bool scale_radial)
1750 {
1751     selected_move (x, y, false, scale_radial);
1752 }
1753
1754 void
1755 GrDrag::selected_move (double x, double y, bool write_repr, bool scale_radial)
1756 {
1757     if (selected == NULL)
1758         return;
1759
1760     bool did = false;
1761
1762     for (GList *i = selected; i != NULL; i = i->next) {
1763         GrDragger *d = (GrDragger *) i->data;
1764
1765         if (!d->isA(POINT_LG_MID) && !d->isA(POINT_RG_MID1) && !d->isA(POINT_RG_MID2)) {
1766             // if this is an endpoint,
1767
1768             // Moving an rg center moves its focus and radii as well.
1769             // therefore, if this is a focus or radius and if selection
1770             // contains the center as well, do not move this one
1771             if (d->isA(POINT_RG_R1) || d->isA(POINT_RG_R2) ||
1772                 (d->isA(POINT_RG_FOCUS) && !d->isA(POINT_RG_CENTER))) {
1773                 bool skip_radius_with_center = false;
1774                 for (GList *di = selected; di != NULL; di = di->next) {
1775                     GrDragger *d_new = (GrDragger *) di->data;
1776                     if (d_new->isA (((GrDraggable *) d->draggables->data)->item,
1777                                     POINT_RG_CENTER,
1778                                     0,
1779                                     ((GrDraggable *) d->draggables->data)->fill_or_stroke)) {
1780                         // FIXME: here we take into account only the first draggable!
1781                         skip_radius_with_center = true;
1782                     }
1783                 }
1784                 if (skip_radius_with_center)
1785                     continue;
1786             }
1787
1788             did = true;
1789             d->point += NR::Point (x, y);
1790             d->point_original = d->point;
1791             sp_knot_moveto (d->knot, &(d->point));
1792
1793             d->fireDraggables (write_repr, scale_radial);
1794
1795             d->updateDependencies(write_repr);
1796         }
1797     }
1798
1799     if (write_repr && did) {
1800         // we did an undoable action
1801         sp_document_maybe_done (sp_desktop_document (desktop), "grmoveh", SP_VERB_CONTEXT_GRADIENT,
1802                                 _("Move gradient handle(s)"));
1803         return;
1804     }
1805
1806     if (!did) { // none of the end draggers are selected, so let's try to move the mids
1807
1808         GrDragger *dragger = (GrDragger *) selected->data;
1809         // a midpoint dragger can (logically) only contain one GrDraggable
1810         GrDraggable *draggable = (GrDraggable *) dragger->draggables->data;
1811
1812         NR::Point begin(0,0), end(0,0);
1813         NR::Point low_lim(0,0), high_lim(0,0);
1814
1815         SPObject *server = draggable->getServer();
1816         GSList *moving = NULL;
1817         gr_midpoint_limits(dragger, server, &begin, &end, &low_lim, &high_lim, &moving);
1818
1819         NR::Point p(x, y);
1820         p = snap_vector_midpoint (dragger->point + p, low_lim, high_lim, 0);
1821         NR::Point displacement = p - dragger->point;
1822
1823         for (GSList const* i = moving; i != NULL; i = i->next) {
1824             GrDragger *drg = (GrDragger*) i->data;
1825             SPKnot *drgknot = drg->knot;
1826             drg->point += displacement;
1827             sp_knot_moveto (drgknot, & drg->point);
1828             drg->fireDraggables (true);
1829             drg->updateDependencies(true);
1830             did = true;
1831         }
1832
1833         g_slist_free(moving);
1834
1835         if (write_repr && did) {
1836             // we did an undoable action
1837             sp_document_maybe_done (sp_desktop_document (desktop), "grmovem", SP_VERB_CONTEXT_GRADIENT,
1838                                     _("Move gradient mid stop(s)"));
1839         }
1840     }
1841 }
1842
1843 void
1844 GrDrag::selected_move_screen (double x, double y)
1845 {
1846     gdouble zoom = desktop->current_zoom();
1847     gdouble zx = x / zoom;
1848     gdouble zy = y / zoom;
1849
1850     selected_move (zx, zy);
1851 }
1852
1853 /**
1854 Select the knot next to the last selected one and deselect all other selected.
1855 */
1856 GrDragger *
1857 GrDrag::select_next ()
1858 {
1859     GrDragger *d = NULL;
1860     if (selected == NULL || g_list_find(draggers, selected->data)->next == NULL) {
1861         if (draggers)
1862             d = (GrDragger *) draggers->data;
1863     } else {
1864         d = (GrDragger *) g_list_find(draggers, selected->data)->next->data;
1865     }
1866     if (d)
1867         setSelected (d);
1868     return d;
1869 }
1870
1871 /**
1872 Select the knot previous from the last selected one and deselect all other selected.
1873 */
1874 GrDragger *
1875 GrDrag::select_prev ()
1876 {
1877     GrDragger *d = NULL;
1878     if (selected == NULL || g_list_find(draggers, selected->data)->prev == NULL) {
1879         if (draggers)
1880             d = (GrDragger *) g_list_last (draggers)->data;
1881     } else {
1882         d = (GrDragger *) g_list_find(draggers, selected->data)->prev->data;
1883     }
1884     if (d)
1885         setSelected (d);
1886     return d;
1887 }
1888
1889
1890 // FIXME: i.m.o. an ugly function that I just made to work, but... aargh! (Johan)
1891 void
1892 GrDrag::deleteSelected (bool just_one)
1893 {
1894     if (!selected) return;
1895
1896     SPDocument *document = false;
1897
1898     struct StructStopInfo {
1899         SPStop * spstop;
1900         GrDraggable * draggable;
1901         SPGradient * gradient;
1902         SPGradient * vector;
1903     };
1904
1905     GSList *midstoplist = NULL;  // list of stops that must be deleted (will be deleted first)
1906     GSList *endstoplist = NULL;  // list of stops that must be deleted
1907     while (selected) {
1908         GrDragger *dragger = (GrDragger*) selected->data;
1909         for (GSList * drgble = dragger->draggables; drgble != NULL; drgble = drgble->next) {
1910             GrDraggable *draggable = (GrDraggable*) drgble->data;
1911             SPGradient *gradient = sp_item_gradient (draggable->item, draggable->fill_or_stroke);
1912             SPGradient *vector   = sp_gradient_get_forked_vector_if_necessary (gradient, false);
1913
1914             switch (draggable->point_type) {
1915                 case POINT_LG_MID:
1916                 case POINT_RG_MID1:
1917                 case POINT_RG_MID2:
1918                     {
1919                         SPStop *stop = sp_get_stop_i(vector, draggable->point_i);
1920                         // check if already present in list. (e.g. when both RG_MID1 and RG_MID2 were selected)
1921                         bool present = false;
1922                         for (GSList const * l = midstoplist; l != NULL; l = l->next) {
1923                             if ( (SPStop*)l->data == stop ) {
1924                                 present = true;
1925                                 break; // no need to search further.
1926                             }
1927                         }
1928                         if (!present)
1929                             midstoplist = g_slist_append(midstoplist, stop);
1930                     }
1931                     break;
1932                 case POINT_LG_BEGIN:
1933                 case POINT_LG_END:
1934                 case POINT_RG_CENTER:
1935                 case POINT_RG_R1:
1936                 case POINT_RG_R2:
1937                     {
1938                         SPStop *stop = NULL;
1939                         if ( (draggable->point_type == POINT_LG_BEGIN) || (draggable->point_type == POINT_RG_CENTER) ) {
1940                             stop = sp_first_stop(vector);
1941                         } else {
1942                             stop = sp_last_stop(vector);
1943                         }
1944                         if (stop) {
1945                             StructStopInfo *stopinfo = new StructStopInfo;
1946                             stopinfo->spstop = stop;
1947                             stopinfo->draggable = draggable;
1948                             stopinfo->gradient = gradient;
1949                             stopinfo->vector = vector;
1950                             // check if already present in list. (e.g. when both R1 and R2 were selected)
1951                             bool present = false;
1952                             for (GSList const * l = endstoplist; l != NULL; l = l->next) {
1953                                 if ( ((StructStopInfo*)l->data)->spstop == stopinfo->spstop ) {
1954                                     present = true;
1955                                     break; // no need to search further.
1956                                 }
1957                             }
1958                             if (!present)
1959                                 endstoplist = g_slist_append(endstoplist, stopinfo);
1960                         }
1961                     }
1962                     break;
1963                 default:
1964                     break;
1965             }
1966         }
1967         selected = g_list_remove(selected, dragger);
1968         if ( just_one ) break; // iterate once if just_one is set.
1969     }
1970     while (midstoplist) {
1971         SPStop *stop = (SPStop*) midstoplist->data;
1972         document = SP_OBJECT_DOCUMENT (stop);
1973         Inkscape::XML::Node * parent = SP_OBJECT_REPR(stop)->parent();
1974         parent->removeChild(SP_OBJECT_REPR(stop));
1975         midstoplist = g_slist_remove(midstoplist, stop);
1976     }
1977     while (endstoplist) {
1978         StructStopInfo *stopinfo  = (StructStopInfo*) endstoplist->data;
1979         document = SP_OBJECT_DOCUMENT (stopinfo->spstop);
1980
1981         // 2 is the minimum, cannot delete more than that without deleting the whole vector
1982         // cannot use vector->vector.stops.size() because the vector might be invalidated by deletion of a midstop
1983         // manually count the children, don't know if there already exists a function for this...
1984         int len = 0;
1985         for ( SPObject *child = sp_object_first_child(stopinfo->vector) ;
1986               child != NULL ;
1987               child = SP_OBJECT_NEXT(child) )
1988         {
1989             if ( SP_IS_STOP(child) )  len ++;
1990         }
1991         if (len > 2)
1992         {
1993             switch (stopinfo->draggable->point_type) {
1994                 case POINT_LG_BEGIN:
1995                     {
1996                         SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
1997
1998                         SPLinearGradient *lg = SP_LINEARGRADIENT(stopinfo->gradient);
1999                         NR::Point oldbegin = NR::Point (lg->x1.computed, lg->y1.computed);
2000                         NR::Point end = NR::Point (lg->x2.computed, lg->y2.computed);
2001                         SPStop *stop = sp_first_stop(stopinfo->vector);
2002                         gdouble offset = stop->offset;
2003                         NR::Point newbegin = oldbegin + offset * (end - oldbegin);
2004                         lg->x1.computed = newbegin[NR::X];
2005                         lg->y1.computed = newbegin[NR::Y];
2006
2007                         Inkscape::XML::Node *repr = SP_OBJECT_REPR(stopinfo->gradient);
2008                         sp_repr_set_svg_double(repr, "x1", lg->x1.computed);
2009                         sp_repr_set_svg_double(repr, "y1", lg->y1.computed);
2010                         stop->offset = 0;
2011                         sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", 0);
2012
2013                         // iterate through midstops to set new offset values such that they won't move on canvas.
2014                         SPStop *laststop = sp_last_stop(stopinfo->vector);
2015                         stop = sp_next_stop(stop);
2016                         while ( stop != laststop ) {
2017                             stop->offset = (stop->offset - offset)/(1 - offset);
2018                             sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
2019                             stop = sp_next_stop(stop);
2020                         }
2021                     }
2022                     break;
2023                 case POINT_LG_END:
2024                     {
2025                         SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
2026
2027                         SPLinearGradient *lg = SP_LINEARGRADIENT(stopinfo->gradient);
2028                         NR::Point begin = NR::Point (lg->x1.computed, lg->y1.computed);
2029                         NR::Point oldend = NR::Point (lg->x2.computed, lg->y2.computed);
2030                         SPStop *laststop = sp_last_stop(stopinfo->vector);
2031                         gdouble offset = laststop->offset;
2032                         NR::Point newend = begin + offset * (oldend - begin);
2033                         lg->x2.computed = newend[NR::X];
2034                         lg->y2.computed = newend[NR::Y];
2035
2036                         Inkscape::XML::Node *repr = SP_OBJECT_REPR(stopinfo->gradient);
2037                         sp_repr_set_svg_double(repr, "x2", lg->x2.computed);
2038                         sp_repr_set_svg_double(repr, "y2", lg->y2.computed);
2039                         laststop->offset = 1;
2040                         sp_repr_set_css_double (SP_OBJECT_REPR (laststop), "offset", 1);
2041
2042                         // iterate through midstops to set new offset values such that they won't move on canvas.
2043                         SPStop *stop = sp_first_stop(stopinfo->vector);
2044                         stop = sp_next_stop(stop);
2045                         while ( stop != laststop ) {
2046                             stop->offset = stop->offset / offset;
2047                             sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
2048                             stop = sp_next_stop(stop);
2049                         }
2050                     }
2051                     break;
2052                 case POINT_RG_CENTER:
2053                     {
2054                         SPStop *newfirst = sp_next_stop (stopinfo->spstop);
2055                         if (newfirst) {
2056                             newfirst->offset = 0;
2057                             sp_repr_set_css_double (SP_OBJECT_REPR (newfirst), "offset", 0);
2058                         }
2059                         SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
2060                     }
2061                     break;
2062                 case POINT_RG_R1:
2063                 case POINT_RG_R2:
2064                         SP_OBJECT_REPR(stopinfo->vector)->removeChild(SP_OBJECT_REPR(stopinfo->spstop));
2065
2066                         SPRadialGradient *rg = SP_RADIALGRADIENT(stopinfo->gradient);
2067                         double oldradius = rg->r.computed;
2068                         SPStop *laststop = sp_last_stop(stopinfo->vector);
2069                         gdouble offset = laststop->offset;
2070                         double newradius = offset * oldradius;
2071                         rg->r.computed = newradius;
2072
2073                         Inkscape::XML::Node *repr = SP_OBJECT_REPR(rg);
2074                         sp_repr_set_svg_double(repr, "r", rg->r.computed);
2075                         laststop->offset = 1;
2076                         sp_repr_set_css_double (SP_OBJECT_REPR (laststop), "offset", 1);
2077
2078                         // iterate through midstops to set new offset values such that they won't move on canvas.
2079                         SPStop *stop = sp_first_stop(stopinfo->vector);
2080                         stop = sp_next_stop(stop);
2081                         while ( stop != laststop ) {
2082                             stop->offset = stop->offset / offset;
2083                             sp_repr_set_css_double (SP_OBJECT_REPR (stop), "offset", stop->offset);
2084                             stop = sp_next_stop(stop);
2085                         }
2086                         break;
2087             }
2088         }
2089         else
2090         { // delete the gradient from the object. set fill to unset  FIXME: set to fill of unselected node?
2091             SPCSSAttr *css = sp_repr_css_attr_new ();
2092
2093             // stopinfo->spstop is the selected stop
2094             Inkscape::XML::Node *unselectedrepr = SP_OBJECT_REPR(stopinfo->vector)->firstChild();
2095             if (unselectedrepr == SP_OBJECT_REPR(stopinfo->spstop) ) {
2096                 unselectedrepr = unselectedrepr->next();
2097             }
2098
2099             if (unselectedrepr == NULL) {
2100                 if (stopinfo->draggable->fill_or_stroke) {
2101                     sp_repr_css_unset_property (css, "fill");
2102                 } else {
2103                     sp_repr_css_unset_property (css, "stroke");
2104                 }
2105             } else {
2106                 SPCSSAttr *stopcss = sp_repr_css_attr(unselectedrepr, "style");
2107                 if (stopinfo->draggable->fill_or_stroke) {
2108                     sp_repr_css_set_property(css, "fill", sp_repr_css_property(stopcss, "stop-color", "inkscape:unset"));
2109                     sp_repr_css_set_property(css, "fill-opacity", sp_repr_css_property(stopcss, "stop-opacity", "1"));
2110                 } else {
2111                     sp_repr_css_set_property(css, "stroke", sp_repr_css_property(stopcss, "stop-color", "inkscape:unset"));
2112                     sp_repr_css_set_property(css, "stroke-opacity", sp_repr_css_property(stopcss, "stop-opacity", "1"));
2113                 }
2114                 sp_repr_css_attr_unref (stopcss);
2115             }
2116
2117             sp_repr_css_change (SP_OBJECT_REPR (stopinfo->draggable->item), css, "style");
2118             sp_repr_css_attr_unref (css);
2119         }
2120
2121         endstoplist = g_slist_remove(endstoplist, stopinfo);
2122         delete stopinfo;
2123     }
2124
2125     if (document) {
2126         sp_document_done ( document, SP_VERB_CONTEXT_GRADIENT, _("Delete gradient stop(s)") );
2127     }
2128 }
2129
2130
2131 /*
2132   Local Variables:
2133   mode:c++
2134   c-file-style:"stroustrup"
2135   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
2136   indent-tabs-mode:nil
2137   fill-column:99
2138   End:
2139 */
2140 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :