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
  29 #include "xml/repr.h"
  30 #include "svg/css-ostringstream.h"
  31
  32 #include "svg/svg.h"
  33
  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"
  43
  44 #define GR_KNOT_COLOR_NORMAL 0xffffff00
  45 #define GR_KNOT_COLOR_SELECTED 0x0000ff00
  46
  47 #define GR_LINE_COLOR_FILL 0x0000ff7f
  48 #define GR_LINE_COLOR_STROKE 0x9999007f
  49
  50 // screen pixels between knots when they snap:
  51 #define SNAP_DIST 5
  52
  53 // absolute distance between gradient points for them to become a single dragger when the drag is created:
  54 #define MERGE_DIST 0.1
  55
  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 };
  68
  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 };
  80
  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 }
  89
  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 }
 102
 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;
 112
 113     if (property != QUERY_STYLE_PROPERTY_FILL && property != QUERY_STYLE_PROPERTY_STROKE && property != QUERY_STYLE_PROPERTY_MASTEROPACITY) {
 114         return QUERY_STYLE_NOTHING;
 115     }
 116
 117     if (!drag->selected) {
 118         return QUERY_STYLE_NOTHING;
 119     } else {
 120         int ret = QUERY_STYLE_NOTHING;
 121
 122         float cf[4];
 123         cf[0] = cf[1] = cf[2] = cf[3] = 0;
 124
 125         int count = 0;
 126
 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;
 129
 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             }
 135
 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);
 141
 142             count ++;
 143         }
 144
 145         if (count) {
 146             cf[0] /= count;
 147             cf[1] /= count;
 148             cf[2] /= count;
 149             cf[3] /= count;
 150
 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;
 158
 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;
 163
 164             style->opacity.value = SP_SCALE24_FROM_FLOAT (cf[3]);
 165             style->opacity.set = TRUE;
 166         }
 167
 168         return ret;
 169     }
 170 }
 171
 172 bool
 173 gr_drag_style_set (const SPCSSAttr *css, gpointer data)
 174 {
 175     GrDrag *drag = (GrDrag *) data;
 176
 177     if (!drag->selected)
 178         return false;
 179
 180     SPCSSAttr *stop = sp_repr_css_attr_new ();
 181
 182     // See if the css contains interesting properties, and if so, translate them into the format
 183     // acceptable for gradient stops
 184
 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"));
 188
 189     if (css->attribute("lighting-color"))
 190         sp_repr_css_set_property (stop, "stop-color", css->attribute("lighting-color"));
 191
 192     if (css->attribute("color"))
 193         sp_repr_css_set_property (stop, "stop-color", css->attribute("color"));
 194
 195     if (css->attribute("stroke") && strcmp(css->attribute("stroke"), "none"))
 196         sp_repr_css_set_property (stop, "stop-color", css->attribute("stroke"));
 197
 198     if (css->attribute("fill") && strcmp(css->attribute("fill"), "none"))
 199         sp_repr_css_set_property (stop, "stop-color", css->attribute("fill"));
 200
 201     if (css->attribute("stop-color"))
 202         sp_repr_css_set_property (stop, "stop-color", css->attribute("stop-color"));
 203
 204
 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);
 213
 214         Inkscape::CSSOStringStream os;
 215         os << accumulated;
 216         sp_repr_css_set_property (stop, "stop-opacity", os.str().c_str());
 217
 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     }
 222
 223     if (!stop->attributeList()) { // nothing for us here, pass it on
 224         sp_repr_css_attr_unref(stop);
 225         return false;
 226     }
 227
 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;
 232
 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     }
 237
 238     //sp_repr_css_print(stop);
 239     sp_repr_css_attr_unref(stop);
 240     return true;
 241 }
 242
 243 GrDrag::GrDrag(SPDesktop *desktop) {
 244
 245     this->desktop = desktop;
 246
 247     this->selection = sp_desktop_selection(desktop);
 248
 249     this->draggers = NULL;
 250     this->lines = NULL;
 251     this->selected = NULL;
 252
 253     this->hor_levels.clear();
 254     this->vert_levels.clear();
 255
 256     this->local_change = false;
 257
 258     this->sel_changed_connection = this->selection->connectChanged(
 259         sigc::bind (
 260             sigc::ptr_fun(&gr_drag_sel_changed),
 261             (gpointer)this )
 262
 263         );
 264     this->sel_modified_connection = this->selection->connectModified(
 265         sigc::bind(
 266             sigc::ptr_fun(&gr_drag_sel_modified),
 267             (gpointer)this )
 268         );
 269
 270     this->style_set_connection = this->desktop->connectSetStyle(
 271         sigc::bind(
 272             sigc::ptr_fun(&gr_drag_style_set),
 273             (gpointer)this )
 274         );
 275
 276     this->style_query_connection = this->desktop->connectQueryStyle(
 277         sigc::bind(
 278             sigc::ptr_fun(&gr_drag_style_query),
 279             (gpointer)this )
 280         );
 281
 282     this->updateDraggers ();
 283     this->updateLines ();
 284     this->updateLevels ();
 285
 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 }
 290
 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();
 297
 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     }
 310
 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;
 318
 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 }
 325
 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;
 332
 333     g_object_ref (G_OBJECT (this->item));
 334 }
 335
 336 GrDraggable::~GrDraggable ()
 337 {
 338     g_object_unref (G_OBJECT (this->item));
 339 }
 340
 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 }
 354
 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);
 362
 363     if (r < 0.0) return begin;
 364     if (r > length) return end;
 365
 366     double snapdist = length * snap;
 367     double r_snapped = (snap==0) ? r : floor(r/(snapdist + 0.5)) * snapdist;
 368
 369     return (begin + r_snapped * be);
 370 }
 371
 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;
 377
 378     NR::Point p = *ppointer;
 379
 380     // FIXME: take from prefs
 381     double snap_dist = SNAP_DIST / dragger->parent->desktop->current_zoom();
 382
 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) {
 405
 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                 }
 413
 414                 // unlink and delete this dragger
 415                 dragger->parent->draggers = g_list_remove (dragger->parent->draggers, dragger);
 416                 delete dragger;
 417
 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     }
 431
 432
 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     }
 448
 449     if (state & GDK_CONTROL_MASK) {
 450         unsigned snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 451         /* 0 means no snapping. */
 452
 453         // This list will store snap vectors from all draggables of dragger
 454         GSList *snap_vectors = NULL;
 455
 456         for (GSList const* i = dragger->draggables; i != NULL; i = i->next) {
 457             GrDraggable *draggable = (GrDraggable *) i->data;
 458
 459             NR::Point *dr_snap = NULL;
 460
 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 = &center;
 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             }
 498
 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         }
 513
 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         }
 525
 526         g_slist_free(snap_vectors);
 527     }
 528
 529     dragger->point = p;
 530
 531     if ((state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK)) {
 532         dragger->fireDraggables (false, true);
 533     } else {
 534         dragger->fireDraggables (false);
 535     }
 536
 537     dragger->updateDependencies(false);
 538
 539     drag->keep_selection = (bool) g_list_find(drag->selected, dragger);
 540 }
 541
 542
 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;
 553
 554     // FIXME: take from prefs
 555     double snap_fraction = 0.1;
 556
 557     NR::Point p = *ppointer;
 558     NR::Point begin(0,0), end(0,0);
 559
 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);
 565
 566
 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);
 571
 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         }
 590
 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     }
 603
 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;
 612
 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;
 626
 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     }
 633
 634     NR::Point low_lim  = dragger->point - (lowest_dragger->point - begin);
 635     NR::Point high_lim = dragger->point - (highest_dragger->point - end);
 636
 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;
 643
 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     }
 652
 653     drag->keep_selection = is_selected;
 654 }
 655
 656
 657
 658 static void
 659 gr_knot_grabbed_handler (SPKnot *knot, unsigned int state, gpointer data)
 660 {
 661     GrDragger *dragger = (GrDragger *) data;
 662
 663     sp_canvas_force_full_redraw_after_interruptions(dragger->parent->desktop->canvas, 5);
 664 }
 665
 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;
 673
 674     sp_canvas_end_forced_full_redraws(dragger->parent->desktop->canvas);
 675
 676     dragger->point_original = dragger->point = knot->pos;
 677
 678     if ((state & GDK_CONTROL_MASK) && (state & GDK_SHIFT_MASK)) {
 679         dragger->fireDraggables (true, true);
 680     } else {
 681         dragger->fireDraggables (true);
 682     }
 683
 684     // make this dragger selected
 685     if (!dragger->parent->keep_selection) {
 686         dragger->parent->setSelected (dragger);
 687     }
 688     dragger->parent->keep_selection = false;
 689
 690     dragger->updateDependencies(true);
 691
 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 }
 696
 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;
 707
 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                 }
 744
 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;
 752
 753         if ( state & GDK_SHIFT_MASK ) {
 754             dragger->parent->setSelected (dragger, true, false);
 755         } else {
 756             dragger->parent->setSelected (dragger);
 757         }
 758     }
 759 }
 760
 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;
 768
 769     dragger->point_original = dragger->point;
 770
 771     if (dragger->draggables == NULL)
 772         return;
 773
 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 }
 777
 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;
 786
 787         // set local_change flag so that selection_changed callback does not regenerate draggers
 788         this->parent->local_change = true;
 789
 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 }
 797
 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 }
 812
 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 }
 827
 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;
 844
 845     return true;
 846 }
 847
 848 bool
 849 GrDragger::mayMerge (GrDragger *other)
 850 {
 851     if (this == other)
 852         return false;
 853
 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 }
 864
 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 }
 875
 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         }
 886
 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;
 900
 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 }
 919
 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 }
 931
 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);
 939
 940     this->updateTip();
 941 }
 942
 943
 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;
 952
 953     sp_knot_moveto (this->knot, &(this->point));
 954
 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 }
 964
 965
 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;
 978
 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 }
 990
 991
 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);
1005
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);
1013
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 }
1050
1051
1052
1053 GrDragger::GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable)
1054 {
1055     this->draggables = NULL;
1056
1057     this->parent = parent;
1058
1059     this->point = p;
1060     this->point_original = p;
1061
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);
1068
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);
1072
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);
1088
1089     // add the initial draggable
1090     if (draggable)
1091         this->addDraggable (draggable);
1092     updateKnotShape();
1093 }
1094
1095 GrDragger::~GrDragger ()
1096 {
1097     // unselect if it was selected
1098     this->parent->setDeselected(this);
1099
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);
1106
1107     /* unref should call destroy */
1108     g_object_unref (G_OBJECT (this->knot));
1109
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 }
1117
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 }
1135
1136
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 }
1145
1146
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 }
1156
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 }
1166
1167
1168
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 }
1180
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 }
1190
1191
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;
1202
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 }
1236
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 }
1250
1251
1252
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 }
1267
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);
1276
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     }
1286
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 }
1291
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 }
1314
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 }
1330
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 }
1342
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;
1359
1360     g_return_if_fail (this->selection != NULL);
1361
1362     for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1363
1364         SPItem *item = SP_ITEM(i->data);
1365         SPStyle *style = SP_OBJECT_STYLE (item);
1366
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         }
1375
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 }
1386
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;
1400
1401     g_return_if_fail (this->selection != NULL);
1402
1403     for (GSList const* i = this->selection->itemList(); i != NULL; i = i->next) {
1404
1405         SPItem *item = SP_ITEM(i->data);
1406
1407         SPStyle *style = SP_OBJECT_STYLE (item);
1408
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         }
1419
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 }
1432
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();
1441
1442     g_return_if_fail (this->selection != NULL);
1443
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 }
1456
1457 void
1458 GrDrag::selected_reverse_vector ()
1459 {
1460     if (selected == NULL)
1461         return;
1462
1463     for (GSList const* i = ( (GrDragger*) selected->data )->draggables; i != NULL; i = i->next) {
1464         GrDraggable *draggable = (GrDraggable *) i->data;
1465
1466         sp_item_gradient_reverse_vector (draggable->item, draggable->fill_or_stroke);
1467     }
1468 }
1469
1470 void
1471 GrDrag::selected_move (double x, double y)
1472 {
1473 /*
1474     if (selected == NULL)
1475         return;
1476
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));
1481
1482     selected->fireDraggables (true);
1483
1484     selected->updateDependencies(true);
1485
1486     // we did an undoable action
1487     sp_document_done (sp_desktop_document (desktop), SP_VERB_CONTEXT_GRADIENT,
1488                       _("Move gradient handle"));
1489 */
1490 }
1491
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;
1498
1499     selected_move (zx, zy);
1500 }
1501
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 }
1515
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 }
1529
1530
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;
1536
1537     SPDocument *document = false;
1538
1539     struct StructStopInfo {
1540         SPStop * spstop;
1541         GrDraggable * draggable;
1542         SPGradient * gradient;
1543         SPGradient * vector;
1544     };
1545
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);
1554
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);
1621
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));
1638
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];
1647
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);
1653
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));
1667
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];
1676
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);
1682
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));
1706
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;
1713
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);
1718
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         }
1741
1742         endstoplist = g_slist_remove(endstoplist, stopinfo);
1743         delete stopinfo;
1744     }
1745
1746     if (document) {
1747         sp_document_done ( document, SP_VERB_CONTEXT_GRADIENT, _("Delete gradient stop(s)") );
1748     }
1749 }
1750
1751
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 :