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-rw-r--r--src/live_effects/lpe-knot.cpp739
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diff --git a/src/live_effects/lpe-knot.cpp b/src/live_effects/lpe-knot.cpp
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+++ b/src/live_effects/lpe-knot.cpp
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/**
+ * @file
+ * LPE knot effect implementation.
+ */
+/* Authors:
+ * Jean-Francois Barraud <jf.barraud@gmail.com>
+ * Abhishek Sharma
+ * Johan Engelen
+ *
+ * Copyright (C) 2007-2012 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <gdk/gdk.h>
+#include <optional>
+
+#include <2geom/sbasis-to-bezier.h>
+#include <2geom/bezier-to-sbasis.h>
+#include <2geom/basic-intersection.h>
+
+#include "lpe-knot.h"
+
+// for change crossing undo
+#include "document.h"
+#include "document-undo.h"
+
+#include "style.h"
+
+#include "display/curve.h"
+
+#include "helper/geom.h"
+
+#include "object/sp-path.h"
+#include "object/sp-shape.h"
+
+#include "ui/icon-names.h"
+#include "ui/knot/knot-holder.h"
+#include "ui/knot/knot-holder-entity.h"
+
+
+// TODO due to internal breakage in glibmm headers, this must be last:
+#include <glibmm/i18n.h>
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+class KnotHolderEntityCrossingSwitcher : public LPEKnotHolderEntity {
+public:
+ KnotHolderEntityCrossingSwitcher(LPEKnot *effect) : LPEKnotHolderEntity(effect) {};
+ void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override;
+ Geom::Point knot_get() const override;
+ void knot_click(guint state) override;
+};
+
+
+static Geom::Path::size_type size_nondegenerate(Geom::Path const &path) {
+ Geom::Path::size_type retval = path.size_default();
+ const Geom::Curve &closingline = path.back_closed();
+ // the closing line segment is always of type
+ // Geom::LineSegment.
+ if (are_near(closingline.initialPoint(), closingline.finalPoint())) {
+ // closingline.isDegenerate() did not work, because it only checks for
+ // *exact* zero length, which goes wrong for relative coordinates and
+ // rounding errors...
+ // the closing line segment has zero-length. So stop before that one!
+ retval = path.size_open();
+ }
+ return retval;
+}
+
+//---------------------------------------------------------------------------
+//LPEKnot specific Interval manipulation.
+//---------------------------------------------------------------------------
+
+//remove an interval from an union of intervals.
+//TODO: is it worth moving it to 2Geom?
+static
+std::vector<Geom::Interval> complementOf(Geom::Interval I, std::vector<Geom::Interval> domain){
+ std::vector<Geom::Interval> ret;
+ if (!domain.empty()) {
+ double min = domain.front().min();
+ double max = domain.back().max();
+ Geom::Interval I1 = Geom::Interval(min,I.min());
+ Geom::Interval I2 = Geom::Interval(I.max(),max);
+
+ for (auto i : domain){
+ std::optional<Geom::Interval> I1i = intersect(i,I1);
+ if (I1i && !I1i->isSingular()) ret.push_back(*I1i);
+ std::optional<Geom::Interval> I2i = intersect(i,I2);
+ if (I2i && !I2i->isSingular()) ret.push_back(*I2i);
+ }
+ }
+ return ret;
+}
+
+//find the time interval during which patha is hidden by pathb near a given crossing.
+// Warning: not accurate!
+static
+Geom::Interval
+findShadowedTime(Geom::Path const &patha, std::vector<Geom::Point> const &pt_and_dir,
+ double const ta, double const width){
+ using namespace Geom;
+ Point T = unit_vector(pt_and_dir[1]);
+ Point N = T.cw();
+ //Point A = pt_and_dir[0] - 3 * width * T;
+ //Point B = A+6*width*T;
+
+ Affine mat = from_basis( T, N, pt_and_dir[0] );
+ mat = mat.inverse();
+ Geom::Path p = patha * mat;
+
+ std::vector<double> times;
+
+ //TODO: explore the path fwd/backward from ta (worth?)
+ for (unsigned i = 0; i < size_nondegenerate(patha); i++){
+ D2<SBasis> f = p[i].toSBasis();
+ std::vector<double> times_i, temptimes;
+ temptimes = roots(f[Y]-width);
+ times_i.insert(times_i.end(), temptimes.begin(), temptimes.end() );
+ temptimes = roots(f[Y]+width);
+ times_i.insert(times_i.end(), temptimes.begin(), temptimes.end() );
+ temptimes = roots(f[X]-3*width);
+ times_i.insert(times_i.end(), temptimes.begin(), temptimes.end() );
+ temptimes = roots(f[X]+3*width);
+ times_i.insert(times_i.end(), temptimes.begin(), temptimes.end() );
+ for (double & k : times_i){
+ k+=i;
+ }
+ times.insert(times.end(), times_i.begin(), times_i.end() );
+ }
+ std::sort( times.begin(), times.end() );
+ std::vector<double>::iterator new_end = std::unique( times.begin(), times.end() );
+ times.resize( new_end - times.begin() );
+
+ double tmin = 0, tmax = size_nondegenerate(patha);
+ double period = size_nondegenerate(patha);
+ if (!times.empty()){
+ unsigned rk = upper_bound( times.begin(), times.end(), ta ) - times.begin();
+ if ( rk < times.size() )
+ tmax = times[rk];
+ else if ( patha.closed() )
+ tmax = times[0]+period;
+
+ if ( rk > 0 )
+ tmin = times[rk-1];
+ else if ( patha.closed() )
+ tmin = times.back()-period;
+ }
+ return Interval(tmin,tmax);
+}
+
+//---------------------------------------------------------------------------
+//LPEKnot specific Crossing Data manipulation.
+//---------------------------------------------------------------------------
+
+//Yet another crossing data representation.
+// an CrossingPoint stores
+// -an intersection point
+// -the involved path components
+// -for each component, the time at which this crossing occurs + the order of this crossing along the component (when starting from 0).
+
+namespace LPEKnotNS {//just in case...
+CrossingPoints::CrossingPoints(Geom::PathVector const &paths) : std::vector<CrossingPoint>(){
+// std::cout<<"\nCrossingPoints creation from path vector\n";
+ for( unsigned i=0; i<paths.size(); i++){
+ for( unsigned ii=0; ii < size_nondegenerate(paths[i]); ii++){
+ for( unsigned j=i; j<paths.size(); j++){
+ for( unsigned jj=(i==j?ii:0); jj < size_nondegenerate(paths[j]); jj++){
+ std::vector<std::pair<double,double> > times;
+ if ( (i==j) && (ii==jj) ) {
+
+// std::cout<<"--(self int)\n";
+// std::cout << paths[i][ii].toSBasis()[Geom::X] <<"\n";
+// std::cout << paths[i][ii].toSBasis()[Geom::Y] <<"\n";
+
+ find_self_intersections( times, paths[i][ii].toSBasis() );
+ } else {
+// std::cout<<"--(pair int)\n";
+// std::cout << paths[i][ii].toSBasis()[Geom::X] <<"\n";
+// std::cout << paths[i][ii].toSBasis()[Geom::Y] <<"\n";
+// std::cout<<"with\n";
+// std::cout << paths[j][jj].toSBasis()[Geom::X] <<"\n";
+// std::cout << paths[j][jj].toSBasis()[Geom::Y] <<"\n";
+
+ find_intersections( times, paths[i][ii].toSBasis(), paths[j][jj].toSBasis() );
+ }
+ for (auto & time : times){
+ //std::cout<<"intersection "<<i<<"["<<ii<<"]("<<times[k].first<<")= "<<j<<"["<<jj<<"]("<<times[k].second<<")\n";
+ if ( !std::isnan(time.first) && !std::isnan(time.second) ){
+ double zero = 1e-4;
+ if ( (i==j) && (fabs(time.first+ii - time.second-jj) <= zero) )
+ { //this is just end=start of successive curves in a path.
+ continue;
+ }
+ if ( (i==j) && (ii == 0) && (jj == size_nondegenerate(paths[i])-1)
+ && paths[i].closed()
+ && (fabs(time.first) <= zero)
+ && (fabs(time.second - 1) <= zero) )
+ {//this is just end=start of a closed path.
+ continue;
+ }
+ CrossingPoint cp;
+ cp.pt = paths[i][ii].pointAt(time.first);
+ cp.sign = 1;
+ cp.i = i;
+ cp.j = j;
+ cp.ni = 0; cp.nj=0;//not set yet
+ cp.ti = time.first + ii;
+ cp.tj = time.second + jj;
+ push_back(cp);
+ }else{
+ std::cout<<"ooops: find_(self)_intersections returned NaN:" << std::endl;
+ //std::cout<<"intersection "<<i<<"["<<ii<<"](NaN)= "<<j<<"["<<jj<<"](NaN)\n";
+ }
+ }
+ }
+ }
+ }
+ }
+ for( unsigned i=0; i<paths.size(); i++){
+ std::map < double, unsigned > cuts;
+ for( unsigned k=0; k<size(); k++){
+ CrossingPoint cp = (*this)[k];
+ if (cp.i == i) cuts[cp.ti] = k;
+ if (cp.j == i) cuts[cp.tj] = k;
+ }
+ unsigned count = 0;
+ for (auto & cut : cuts){
+ if ( ((*this)[cut.second].i == i) && ((*this)[cut.second].ti == cut.first) ){
+ (*this)[cut.second].ni = count;
+ }else{
+ (*this)[cut.second].nj = count;
+ }
+ count++;
+ }
+ }
+}
+
+CrossingPoints::CrossingPoints(std::vector<double> const &input) : std::vector<CrossingPoint>()
+{
+ if ( (input.size() > 0) && (input.size()%9 == 0) ){
+ using namespace Geom;
+ for( unsigned n=0; n<input.size(); ){
+ CrossingPoint cp;
+ cp.pt[X] = input[n++];
+ cp.pt[Y] = input[n++];
+ cp.i = input[n++];
+ cp.j = input[n++];
+ cp.ni = input[n++];
+ cp.nj = input[n++];
+ cp.ti = input[n++];
+ cp.tj = input[n++];
+ cp.sign = input[n++];
+ push_back(cp);
+ }
+ }
+}
+
+std::vector<double>
+CrossingPoints::to_vector()
+{
+ using namespace Geom;
+ std::vector<double> result;
+ for( unsigned n=0; n<size(); n++){
+ CrossingPoint cp = (*this)[n];
+ result.push_back(cp.pt[X]);
+ result.push_back(cp.pt[Y]);
+ result.push_back(double(cp.i));
+ result.push_back(double(cp.j));
+ result.push_back(double(cp.ni));
+ result.push_back(double(cp.nj));
+ result.push_back(double(cp.ti));
+ result.push_back(double(cp.tj));
+ result.push_back(double(cp.sign));
+ }
+ return result;
+}
+
+//FIXME: rewrite to check success: return bool, put result in arg.
+CrossingPoint
+CrossingPoints::get(unsigned const i, unsigned const ni)
+{
+ for (unsigned k=0; k<size(); k++){
+ if ( ( ((*this)[k].i==i) && ((*this)[k].ni==ni) )
+ || ( ((*this)[k].j==i) && ((*this)[k].nj==ni) ) )
+ {
+ return (*this)[k];
+ }
+ }
+ g_warning("LPEKnotNS::CrossingPoints::get error. %uth crossing along string %u not found.",ni,i);
+ assert(false);//debug purpose...
+ return CrossingPoint();
+}
+
+static unsigned
+idx_of_nearest(CrossingPoints const &cpts, Geom::Point const &p)
+{
+ double dist=-1;
+ unsigned result = cpts.size();
+ for (unsigned k=0; k<cpts.size(); k++){
+ double dist_k = Geom::L2(p-cpts[k].pt);
+ if ( (dist < 0) || (dist > dist_k) ) {
+ result = k;
+ dist = dist_k;
+ }
+ }
+ return result;
+}
+
+//TODO: Find a way to warn the user when the topology changes.
+//TODO: be smarter at guessing the signs when the topology changed?
+void
+CrossingPoints::inherit_signs(CrossingPoints const &other, int default_value)
+{
+ bool topo_changed = false;
+ for (unsigned n=0; n < size(); n++){
+ if ( (n < other.size())
+ && (other[n].i == (*this)[n].i)
+ && (other[n].j == (*this)[n].j)
+ && (other[n].ni == (*this)[n].ni)
+ && (other[n].nj == (*this)[n].nj) )
+ {
+ (*this)[n].sign = other[n].sign;
+ } else {
+ topo_changed = true;
+ break;
+ }
+ }
+ if (topo_changed) {
+ //TODO: Find a way to warn the user!!
+// std::cout<<"knot topolgy changed!\n";
+ for (unsigned n=0; n < size(); n++){
+ Geom::Point p = (*this)[n].pt;
+ unsigned idx = idx_of_nearest(other,p);
+ if (idx < other.size()) {
+ (*this)[n].sign = other[idx].sign;
+ } else {
+ (*this)[n].sign = default_value;
+ }
+ }
+ }
+}
+
+}
+
+//---------------------------------------------------------------------------
+//---------------------------------------------------------------------------
+//LPEKnot effect.
+//---------------------------------------------------------------------------
+//---------------------------------------------------------------------------
+
+
+LPEKnot::LPEKnot(LivePathEffectObject *lpeobject)
+ : Effect(lpeobject)
+ ,
+ // initialise your parameters here:
+ interruption_width(_("_Gap length:"), _("Size of hidden region of lower string"), "interruption_width", &wr, this,
+ 3)
+ , prop_to_stroke_width(
+ _("_In units of stroke width"),
+ _("Gap width is given in multiples of stroke width. When unchecked, document units are used."),
+ "prop_to_stroke_width", &wr, this, true)
+ , both(_("_Gaps in both"), _("At path intersections, both parts will have a gap"), "both", &wr, this, false)
+ , inverse_width(_("_Groups: Inverse"), _("Use other stroke width, useful in groups with different stroke widths"),
+ "inverse_width", &wr, this, false)
+ , add_stroke_width("St_roke width", "Add the stroke width to the gap size", "add_stroke_width", &wr, this,
+ "inkscape_1.0_and_up", true)
+ , add_other_stroke_width("_Crossing path stroke width", "Add crossed stroke width to the gap size",
+ "add_other_stroke_width", &wr, this, "inkscape_1.0_and_up", true)
+ , switcher_size(_("S_witcher size:"), _("Orientation indicator/switcher size"), "switcher_size", &wr, this, 15)
+ , crossing_points_vector(_("Crossing Signs"), _("Crossing signs"), "crossing_points_vector", &wr, this)
+ , crossing_points()
+ , gpaths()
+ , gstroke_widths()
+ , selectedCrossing(0)
+ , switcher(0., 0.)
+{
+ // register all your parameters here, so Inkscape knows which parameters this effect has:
+ registerParameter(&switcher_size);
+ registerParameter(&interruption_width);
+ registerParameter(&prop_to_stroke_width);
+ registerParameter(&add_stroke_width);
+ registerParameter(&both);
+ registerParameter(&inverse_width);
+ registerParameter(&add_other_stroke_width);
+ registerParameter(&crossing_points_vector);
+
+ _provides_knotholder_entities = true;
+}
+
+LPEKnot::~LPEKnot()
+= default;
+
+void
+LPEKnot::updateSwitcher(){
+ if (selectedCrossing < crossing_points.size()){
+ switcher = crossing_points[selectedCrossing].pt;
+ //std::cout<<"placing switcher at "<<switcher<<" \n";
+ }else if (crossing_points.size()>0){
+ selectedCrossing = 0;
+ switcher = crossing_points[selectedCrossing].pt;
+ //std::cout<<"placing switcher at "<<switcher<<" \n";
+ }else{
+ //std::cout<<"hiding switcher!\n";
+ switcher = Geom::Point(Geom::infinity(),Geom::infinity());
+ }
+}
+
+Geom::PathVector
+LPEKnot::doEffect_path (Geom::PathVector const &path_in)
+{
+ using namespace Geom;
+ Geom::PathVector path_out;
+
+ if (gpaths.size()==0){
+ return path_in;
+ }
+ Geom::PathVector const original_pathv = pathv_to_linear_and_cubic_beziers(path_in);
+ for (const auto & comp : original_pathv){
+
+ //find the relevant path component in gpaths (required to allow groups!)
+ //Q: do we always receive the group members in the same order? can we rest on that?
+ unsigned i0 = 0;
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ gint precision = prefs->getInt("/options/svgoutput/numericprecision");
+ prefs->setInt("/options/svgoutput/numericprecision", 4); // I think this is enough for minor differences
+ for (i0=0; i0<gpaths.size(); i0++){
+ if (sp_svg_write_path(comp) == sp_svg_write_path(gpaths[i0]))
+ break;
+ }
+ prefs->setInt("/options/svgoutput/numericprecision", precision);
+ if (i0 == gpaths.size() ) {THROW_EXCEPTION("lpe-knot error: group member not recognized");}// this should not happen...
+
+ std::vector<Interval> dom;
+ dom.emplace_back(0., size_nondegenerate(gpaths[i0]));
+ for (unsigned p = 0; p < crossing_points.size(); p++){
+ if ( (crossing_points[p].i == i0) || (crossing_points[p].j == i0) ) {
+ unsigned i = crossing_points[p].i;
+ unsigned j = crossing_points[p].j;
+ double ti = crossing_points[p].ti;
+ double tj = crossing_points[p].tj;
+
+ double curveidx, t;
+
+ t = modf(ti, &curveidx);
+ if(curveidx == size_nondegenerate(gpaths[i]) ) { curveidx--; t = 1.;}
+ assert(curveidx >= 0 && curveidx < size_nondegenerate(gpaths[i]));
+ std::vector<Point> flag_i = gpaths[i][curveidx].pointAndDerivatives(t,1);
+
+ t = modf(tj, &curveidx);
+ if(curveidx == size_nondegenerate(gpaths[j]) ) { curveidx--; t = 1.;}
+ assert(curveidx >= 0 && curveidx < size_nondegenerate(gpaths[j]));
+ std::vector<Point> flag_j = gpaths[j][curveidx].pointAndDerivatives(t,1);
+
+
+ int geom_sign = ( cross(flag_i[1], flag_j[1]) < 0 ? 1 : -1);
+ bool i0_is_under = false;
+ double width = interruption_width;
+ if ( crossing_points[p].sign * geom_sign > 0 ){
+ i0_is_under = ( i == i0 );
+ }
+ else if (crossing_points[p].sign * geom_sign < 0) {
+ if (j == i0){
+ i0_is_under = true;
+ }
+ }
+ i0_is_under = crossing_points[p].sign != 0 && both ? true : i0_is_under;
+ if (i0_is_under && j == i0) {
+ // last check of sign makes sure we get different outputs when
+ // path components are part of the same subpath (i == j)
+ if (!(i == j && !both && crossing_points[p].sign * geom_sign > 0)) {
+ std::swap(i, j);
+ std::swap(ti, tj);
+ std::swap(flag_i, flag_j);
+ }
+ }
+ if (i0_is_under){
+ if ( prop_to_stroke_width.get_value() ) {
+ if (inverse_width) {
+ width *= gstroke_widths[j];
+ }
+ else {
+ width *= gstroke_widths[i];
+ }
+ }
+ if (add_stroke_width.get_value() == "true") {
+ width += gstroke_widths[i];
+ }
+ if (add_other_stroke_width.get_value() == "true") {
+ width += gstroke_widths[j];
+ }
+ Interval hidden = findShadowedTime(gpaths[i0], flag_j, ti, width/2);
+ double period = size_nondegenerate(gpaths[i0]);
+ if (hidden.max() > period ) hidden -= period;
+ if (hidden.min()<0){
+ dom = complementOf( Interval(0,hidden.max()) ,dom);
+ dom = complementOf( Interval(hidden.min()+period, period) ,dom);
+ }else{
+ dom = complementOf(hidden,dom);
+ }
+ if (crossing_points[p].i == i0 && crossing_points[p].j == i0 && crossing_points[p].sign != 0 &&
+ both) {
+ hidden = findShadowedTime(gpaths[i0], flag_i, tj, width / 2);
+ period = size_nondegenerate(gpaths[i0]);
+ if (hidden.max() > period)
+ hidden -= period;
+ if (hidden.min() < 0) {
+ dom = complementOf(Interval(0, hidden.max()), dom);
+ dom = complementOf(Interval(hidden.min() + period, period), dom);
+ }
+ else {
+ dom = complementOf(hidden, dom);
+ }
+ }
+ }
+ }
+ }
+
+ //If the all component is hidden, continue.
+ if (dom.empty()){
+ continue;
+ }
+
+ //If the current path is closed and the last/first point is still there, glue first and last piece.
+ unsigned beg_comp = 0, end_comp = dom.size();
+ if ( gpaths[i0].closed() && (dom.front().min() == 0) && (dom.back().max() == size_nondegenerate(gpaths[i0])) ) {
+ if ( dom.size() == 1){
+ path_out.push_back(gpaths[i0]);
+ continue;
+ }else{
+ // std::cout<<"fusing first and last component\n";
+ ++beg_comp;
+ --end_comp;
+ Geom::Path first = gpaths[i0].portion(dom.back());
+ //FIXME: stitching should not be necessary (?!?)
+ first.setStitching(true);
+ first.append(gpaths[i0].portion(dom.front()));
+ path_out.push_back(first);
+ }
+ }
+ for (unsigned comp = beg_comp; comp < end_comp; comp++){
+ assert(dom.at(comp).min() >=0 && dom.at(comp).max() <= size_nondegenerate(gpaths.at(i0)));
+ path_out.push_back(gpaths[i0].portion(dom.at(comp)));
+ }
+ }
+ return path_out;
+}
+
+
+
+//recursively collect gpaths and stroke widths (stolen from "sp-lpe_item.cpp").
+static void
+collectPathsAndWidths (SPLPEItem const *lpeitem, Geom::PathVector &paths, std::vector<double> &stroke_widths){
+ auto lpeitem_mutable = const_cast<SPLPEItem *>(lpeitem);
+
+ if (auto group = dynamic_cast<SPGroup *>(lpeitem_mutable)) {
+ std::vector<SPItem*> item_list = sp_item_group_item_list(group);
+ for (auto subitem : item_list) {
+ if (SP_IS_LPE_ITEM(subitem)) {
+ collectPathsAndWidths(SP_LPE_ITEM(subitem), paths, stroke_widths);
+ }
+ }
+ } else if (auto shape = dynamic_cast<SPShape const *>(lpeitem)) {
+ SPCurve const *c = shape->curve();
+ if (c) {
+ Geom::PathVector subpaths = pathv_to_linear_and_cubic_beziers(c->get_pathvector());
+ for (const auto & subpath : subpaths){
+ paths.push_back(subpath);
+ //FIXME: do we have to be more careful when trying to access stroke width?
+ stroke_widths.push_back(lpeitem->style->stroke_width.computed);
+ }
+ }
+ }
+}
+
+
+void
+LPEKnot::doBeforeEffect (SPLPEItem const* lpeitem)
+{
+ using namespace Geom;
+ original_bbox(lpeitem);
+
+ if (SP_IS_PATH(lpeitem)) {
+ supplied_path = SP_PATH(lpeitem)->curve()->get_pathvector();
+ }
+
+ gpaths.clear();
+ gstroke_widths.clear();
+
+ collectPathsAndWidths(lpeitem, gpaths, gstroke_widths);
+
+// std::cout<<"\nPaths on input:\n";
+// for (unsigned i=0; i<gpaths.size(); i++){
+// for (unsigned ii=0; ii<gpaths[i].size(); ii++){
+// std::cout << gpaths[i][ii].toSBasis()[Geom::X] <<"\n";
+// std::cout << gpaths[i][ii].toSBasis()[Geom::Y] <<"\n";
+// std::cout<<"--\n";
+// }
+// }
+
+ //std::cout<<"crossing_pts_vect: "<<crossing_points_vector.param_getSVGValue()<<".\n";
+ //std::cout<<"prop_to_stroke_width: "<<prop_to_stroke_width.param_getSVGValue()<<".\n";
+
+ LPEKnotNS::CrossingPoints old_crdata(crossing_points_vector.data());
+
+// std::cout<<"\nVectorParam size:"<<crossing_points_vector.data().size()<<"\n";
+
+// std::cout<<"\nOld crdata ("<<old_crdata.size()<<"): \n";
+// for (unsigned toto=0; toto<old_crdata.size(); toto++){
+// std::cout<<"(";
+// std::cout<<old_crdata[toto].i<<",";
+// std::cout<<old_crdata[toto].j<<",";
+// std::cout<<old_crdata[toto].ni<<",";
+// std::cout<<old_crdata[toto].nj<<",";
+// std::cout<<old_crdata[toto].ti<<",";
+// std::cout<<old_crdata[toto].tj<<",";
+// std::cout<<old_crdata[toto].sign<<"),";
+// }
+
+ //if ( old_crdata.size() > 0 ) std::cout<<"first crossing sign = "<<old_crdata[0].sign<<".\n";
+ //else std::cout<<"old data is empty!!\n";
+ crossing_points = LPEKnotNS::CrossingPoints(gpaths);
+// std::cout<<"\nNew crdata ("<<crossing_points.size()<<"): \n";
+// for (unsigned toto=0; toto<crossing_points.size(); toto++){
+// std::cout<<"(";
+// std::cout<<crossing_points[toto].i<<",";
+// std::cout<<crossing_points[toto].j<<",";
+// std::cout<<crossing_points[toto].ni<<",";
+// std::cout<<crossing_points[toto].nj<<",";
+// std::cout<<crossing_points[toto].ti<<",";
+// std::cout<<crossing_points[toto].tj<<",";
+// std::cout<<crossing_points[toto].sign<<"),";
+// }
+ crossing_points.inherit_signs(old_crdata);
+
+ // Don't write to XML here, only store it in the param itself. Will be written to SVG later
+ crossing_points_vector.param_setValue(crossing_points.to_vector());
+
+ updateSwitcher();
+}
+
+void
+LPEKnot::addCanvasIndicators(SPLPEItem const */*lpeitem*/, std::vector<Geom::PathVector> &hp_vec)
+{
+ using namespace Geom;
+ double r = switcher_size*.1;
+ char const * svgd;
+ //TODO: use a nice path!
+ if ( (selectedCrossing >= crossing_points.size()) || (crossing_points[selectedCrossing].sign > 0) ) {
+ //svgd = "M -10,0 A 10 10 0 1 0 0,-10 l 5,-1 -1,2";
+ svgd = "m -7.07,7.07 c 3.9,3.91 10.24,3.91 14.14,0 3.91,-3.9 3.91,-10.24 0,-14.14 -3.9,-3.91 -10.24,-3.91 -14.14,0 l 2.83,-4.24 0.7,2.12";
+ } else if (crossing_points[selectedCrossing].sign < 0) {
+ //svgd = "M 10,0 A 10 10 0 1 1 0,-10 l -5,-1 1,2";
+ svgd = "m 7.07,7.07 c -3.9,3.91 -10.24,3.91 -14.14,0 -3.91,-3.9 -3.91,-10.24 0,-14.14 3.9,-3.91 10.24,-3.91 14.14,0 l -2.83,-4.24 -0.7,2.12";
+ } else {
+ //svgd = "M 10,0 A 10 10 0 1 0 -10,0 A 10 10 0 1 0 10,0 ";
+ svgd = "M 10,0 C 10,5.52 5.52,10 0,10 -5.52,10 -10,5.52 -10,0 c 0,-5.52 4.48,-10 10,-10 5.52,0 10,4.48 10,10 z";
+ }
+ PathVector pathv = sp_svg_read_pathv(svgd);
+ pathv *= Affine(r,0,0,r,0,0) * Translate(switcher);
+ hp_vec.push_back(pathv);
+}
+
+void LPEKnot::addKnotHolderEntities(KnotHolder *knotholder, SPItem *item)
+{
+ KnotHolderEntity *e = new KnotHolderEntityCrossingSwitcher(this);
+ e->create(nullptr, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:CrossingSwitcher",
+ _("Drag to select a crossing, click to flip it, Shift + click to change all crossings, Ctrl + click to "
+ "reset and change all crossings"));
+ knotholder->add(e);
+};
+
+
+void
+KnotHolderEntityCrossingSwitcher::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint /*state*/)
+{
+ LPEKnot* lpe = dynamic_cast<LPEKnot *>(_effect);
+
+ lpe->selectedCrossing = idx_of_nearest(lpe->crossing_points,p);
+ lpe->updateSwitcher();
+ // FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
+ sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
+}
+
+Geom::Point
+KnotHolderEntityCrossingSwitcher::knot_get() const
+{
+ LPEKnot const *lpe = dynamic_cast<LPEKnot const*>(_effect);
+ return lpe->switcher;
+}
+
+void
+KnotHolderEntityCrossingSwitcher::knot_click(guint state)
+{
+ LPEKnot* lpe = dynamic_cast<LPEKnot *>(_effect);
+ unsigned s = lpe->selectedCrossing;
+ if (s < lpe->crossing_points.size()){
+ if (state & GDK_SHIFT_MASK){
+ for (unsigned p = 0; p < lpe->crossing_points.size(); p++) {
+ lpe->crossing_points[p].sign = ((lpe->crossing_points[p].sign + 2) % 3) - 1;
+ }
+ }
+ else if (state & GDK_CONTROL_MASK) {
+ int sign = lpe->crossing_points[s].sign;
+ for (unsigned p = 0; p < lpe->crossing_points.size(); p++) {
+ lpe->crossing_points[p].sign = ((sign + 2) % 3) - 1;
+ }
+ }else{
+ int sign = lpe->crossing_points[s].sign;
+ lpe->crossing_points[s].sign = ((sign+2)%3)-1;
+ //std::cout<<"crossing set to"<<lpe->crossing_points[s].sign<<".\n";
+ }
+ lpe->crossing_points_vector.param_set_and_write_new_value(lpe->crossing_points.to_vector());
+ DocumentUndo::done(lpe->getSPDoc(), _("Change knot crossing"), INKSCAPE_ICON("dialog-path-effects"));
+
+ // FIXME: this should not directly ask for updating the item. It should write to SVG, which triggers updating.
+// sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
+ }
+}
+
+
+/* ######################## */
+
+} // namespace LivePathEffect
+} // namespace Inkscape
+
+/*
+ Local Variables:
+ mode:c++
+ c-file-style:"stroustrup"
+ c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+ indent-tabs-mode:nil
+ fill-column:99
+ End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
+
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