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Diffstat (limited to 'src/live_effects/lpe-offset.cpp')
| -rw-r--r-- | src/live_effects/lpe-offset.cpp | 710 |
1 files changed, 710 insertions, 0 deletions
diff --git a/src/live_effects/lpe-offset.cpp b/src/live_effects/lpe-offset.cpp new file mode 100644 index 0000000..b351b6d --- /dev/null +++ b/src/live_effects/lpe-offset.cpp @@ -0,0 +1,710 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * LPE <offset> implementation + */ +/* + * Authors: + * Maximilian Albert + * Jabiertxo Arraiza + * + * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl> + * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com> + * Copyright (C) Jabierto Arraiza 2015 <jabier.arraiza@marker.es> + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "lpe-offset.h" + +#include <2geom/path-intersection.h> +#include <2geom/piecewise.h> +#include <2geom/svg-path-parser.h> + +#include "inkscape.h" +#include "style.h" + +#include "display/curve.h" +#include "helper/geom-pathstroke.h" +#include "helper/geom.h" +#include "live_effects/parameter/enum.h" +#include "object/sp-shape.h" +#include "path/path-boolop.h" +#include "path/path-util.h" +#include "svg/svg.h" +#include "ui/knot/knot-holder.h" +#include "ui/knot/knot-holder-entity.h" +#include "util/units.h" + +// TODO due to internal breakage in glibmm headers, this must be last: +#include <glibmm/i18n.h> + +namespace Inkscape { +namespace LivePathEffect { + +namespace OfS { + class KnotHolderEntityOffsetPoint : public LPEKnotHolderEntity { + public: + KnotHolderEntityOffsetPoint(LPEOffset * effect) : LPEKnotHolderEntity(effect) {} + ~KnotHolderEntityOffsetPoint() override + { + LPEOffset *lpe = dynamic_cast<LPEOffset *>(_effect); + if (lpe) { + lpe->_knot_entity = nullptr; + } + } + void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override; + void knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state) override; + Geom::Point knot_get() const override; + private: + }; +} // OfS + + +static const Util::EnumData<unsigned> JoinTypeData[] = { + // clang-format off + {JOIN_BEVEL, N_("Beveled"), "bevel"}, + {JOIN_ROUND, N_("Rounded"), "round"}, + {JOIN_MITER, N_("Miter"), "miter"}, + {JOIN_MITER_CLIP, N_("Miter Clip"), "miter-clip"}, + {JOIN_EXTRAPOLATE, N_("Extrapolated arc"), "extrp_arc"}, + {JOIN_EXTRAPOLATE1, N_("Extrapolated arc Alt1"), "extrp_arc1"}, + {JOIN_EXTRAPOLATE2, N_("Extrapolated arc Alt2"), "extrp_arc2"}, + {JOIN_EXTRAPOLATE3, N_("Extrapolated arc Alt3"), "extrp_arc3"}, + // clang-format on +}; + +static const Util::EnumDataConverter<unsigned> JoinTypeConverter(JoinTypeData, sizeof(JoinTypeData)/sizeof(*JoinTypeData)); + + +LPEOffset::LPEOffset(LivePathEffectObject *lpeobject) : + Effect(lpeobject), + unit(_("Unit"), _("Unit of measurement"), "unit", &wr, this, "mm"), + offset(_("Offset:"), _("Offset"), "offset", &wr, this, 0.0), + linejoin_type(_("Join:"), _("Determines the shape of the path's corners"), "linejoin_type", JoinTypeConverter, &wr, this, JOIN_MITER), + miter_limit(_("Miter limit:"), _("Maximum length of the miter join (in units of stroke width)"), "miter_limit", &wr, this, 4.0), + attempt_force_join(_("Force miter"), _("Overrides the miter limit and forces a join."), "attempt_force_join", &wr, this, false), + update_on_knot_move(_("Live update"), _("Update while moving handle"), "update_on_knot_move", &wr, this, true) +{ + show_orig_path = true; + registerParameter(&linejoin_type); + registerParameter(&unit); + registerParameter(&offset); + registerParameter(&miter_limit); + registerParameter(&attempt_force_join); + registerParameter(&update_on_knot_move); + offset.param_set_increments(0.1, 0.1); + offset.param_set_digits(6); + offset_pt = Geom::Point(Geom::infinity(), Geom::infinity()); + _knot_entity = nullptr; + _provides_knotholder_entities = true; + apply_to_clippath_and_mask = true; + prev_unit = unit.get_abbreviation(); + liveknot = false; + fillrule = fill_nonZero; +} + +LPEOffset::~LPEOffset() +{ + modified_connection.disconnect(); +}; + +bool LPEOffset::doOnOpen(SPLPEItem const *lpeitem) +{ + bool fixed = false; + if (!is_load || is_applied) { + return fixed; + } + legacytest_livarotonly = false; + Glib::ustring version = lpeversion.param_getSVGValue(); + if (version < "1.2") { + if (!SP_ACTIVE_DESKTOP) { + legacytest_livarotonly = true; + } + lpeversion.param_setValue("1.2", true); + fixed = true; + } + return fixed; +} + +void +LPEOffset::doOnApply(SPLPEItem const* lpeitem) +{ + lpeversion.param_setValue("1.2", true); +} + +void +LPEOffset::modified(SPObject *obj, guint flags) +{ + if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) { + // Get the used fillrule + SPCSSAttr *css; + const gchar *val; + css = sp_repr_css_attr (sp_lpe_item->getRepr() , "style"); + val = sp_repr_css_property (css, "fill-rule", nullptr); + FillRuleFlatten fillrule_chan = fill_nonZero; + if (val && strcmp (val, "evenodd") == 0) + { + fillrule_chan = fill_oddEven; + } + if (fillrule != fillrule_chan) { + sp_lpe_item_update_patheffect (sp_lpe_item, true, true); + } + } +} + +Geom::Point get_nearest_point(Geom::PathVector pathv, Geom::Point point) +{ + Geom::Point res = Geom::Point(Geom::infinity(), Geom::infinity()); + std::optional< Geom::PathVectorTime > pathvectortime = pathv.nearestTime(point); + if (pathvectortime) { + Geom::PathTime pathtime = pathvectortime->asPathTime(); + res = pathv[(*pathvectortime).path_index].pointAt(pathtime.curve_index + pathtime.t); + } + return res; +} + +/* double get_separation(Geom::PathVector pathv, Geom::Point point, Geom::Point point_b) +{ + Geom::Point res = Geom::Point(Geom::infinity(), Geom::infinity()); + std::optional<Geom::PathVectorTime> pathvectortime = pathv.nearestTime(point); + std::optional<Geom::PathVectorTime> pathvectortime_b = pathv.nearestTime(point_b); + if (pathvectortime && pathvectortime_b) { + Geom::PathTime pathtime = pathvectortime->asPathTime(); + Geom::PathTime pathtime_b = pathvectortime_b->asPathTime(); + if ((*pathvectortime).path_index == (*pathvectortime_b).path_index) { + return std::abs((pathtime.curve_index + pathtime.t) - (pathtime_b.curve_index + pathtime_b.t)); + } + } + return -1; +} */ + +void LPEOffset::transform_multiply(Geom::Affine const &postmul, bool /*set*/) +{ + refresh_widgets = true; + if (!postmul.isTranslation()) { + Geom::Affine current_affine = sp_item_transform_repr(sp_lpe_item); + offset.param_transform_multiply(postmul * current_affine.inverse(), true); + } + offset_pt *= postmul; +} + +Geom::Point LPEOffset::get_default_point(Geom::PathVector pathv) +{ + Geom::Point origin = Geom::Point(Geom::infinity(), Geom::infinity()); + Geom::OptRect bbox = pathv.boundsFast(); + if (bbox) { + origin = Geom::Point((*bbox).midpoint()[Geom::X], (*bbox).top()); + origin = get_nearest_point(pathv, origin); + } + return origin; +} + +double +LPEOffset::sp_get_offset(Geom::Point origin) +{ + double ret_offset = 0; + int winding_value = mix_pathv_all.winding(origin); + bool inset = false; + if (winding_value % 2 != 0) { + inset = true; + } + ret_offset = Geom::distance(origin, get_nearest_point(mix_pathv_all, origin)); + if (inset) { + ret_offset *= -1; + } + return Inkscape::Util::Quantity::convert(ret_offset, "px", unit.get_abbreviation()) * this->scale; +} + +void +LPEOffset::addCanvasIndicators(SPLPEItem const *lpeitem, std::vector<Geom::PathVector> &hp_vec) +{ + hp_vec.push_back(helper_path); +} + +void +LPEOffset::doBeforeEffect (SPLPEItem const* lpeitem) +{ + SPObject *obj = dynamic_cast<SPObject *>(sp_lpe_item); + if (is_load && obj) { + modified_connection = obj->connectModified(sigc::mem_fun(*this, &LPEOffset::modified)); + } + original_bbox(lpeitem); + SPGroup *group = dynamic_cast<SPGroup *>(sp_lpe_item); + if (group) { + mix_pathv_all.clear(); + } + this->scale = lpeitem->i2doc_affine().descrim(); + if (!is_load && prev_unit != unit.get_abbreviation()) { + offset.param_set_value(Inkscape::Util::Quantity::convert(offset, prev_unit, unit.get_abbreviation())); + } + prev_unit = unit.get_abbreviation(); +} + +int offset_winding(Geom::PathVector pathvector, Geom::Path path) +{ + int wind = 0; + Geom::Point p = path.initialPoint(); + for (auto i:pathvector) { + if (i == path) continue; + if (!i.boundsFast().contains(p)) continue; + wind += i.winding(p); + } + return wind; +} + +void LPEOffset::doAfterEffect(SPLPEItem const * /*lpeitem*/, SPCurve *curve) +{ + if (offset_pt == Geom::Point(Geom::infinity(), Geom::infinity())) { + if (_knot_entity) { + _knot_entity->knot_get(); + } + } + if (is_load) { + offset_pt = Geom::Point(Geom::infinity(), Geom::infinity()); + } + if (_knot_entity && sp_lpe_item && !liveknot) { + Geom::PathVector out; + // we don do this on groups, editing is joining ito so no need to update knot + SPShape *shape = dynamic_cast<SPShape *>(sp_lpe_item); + if (shape) { + out = SP_SHAPE(sp_lpe_item)->curve()->get_pathvector(); + offset_pt = get_nearest_point(out, offset_pt); + _knot_entity->knot_get(); + } + } +} + +// TODO: find a way to not remove wanted self intersections +// previously are some failed attempts + +/* // Taken from Knot LPE duple code +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; +} +gint get_nearest_corner(Geom::OptRect bbox, Geom::Point point) +{ + if (bbox) { + double distance_a = Geom::distance(point, (*bbox).corner(0)); + double distance_b = Geom::distance(point, (*bbox).corner(1)); + double distance_c = Geom::distance(point, (*bbox).corner(2)); + double distance_d = Geom::distance(point, (*bbox).corner(3)); + std::vector<double> distances{distance_a, distance_b, distance_c, distance_d}; + std::vector<double>::iterator mindistance = std::min_element(distances.begin(), distances.end()); + return std::distance(distances.begin(), mindistance); + } + return -1; +} + +// This way not work with good selfintersections on consecutive curves +// and when there is nodes nearest to points +// I try different methods to cleanup without luky +// if anyone is interested there is a way to explore +// if in original path the section into the 2 nearest point dont have +// self intersections we can suppose this is a intersection to remove +// it works very well but in good selfintersections work only in one offset direction +bool consecutiveCurves(Geom::Path pathin, Geom::Point p) { + Geom::Coord mindist = std::numeric_limits<Geom::Coord>::max(); + size_t pos; + for (size_t i = 0; i < pathin.size_default(); ++i) { + Geom::Curve const &c = pathin.at(i); + double dist = Geom::distance(p, c.boundsFast()); + if (dist >= mindist) { + continue; + } + Geom::Coord t = c.nearestTime(p); + Geom::Coord d = Geom::distance(c.pointAt(t), p); + if (d < mindist) { + pos = i; + mindist = d; + } + } + size_t pos_b; + mindist = std::numeric_limits<Geom::Coord>::max(); + for (size_t i = 0; i < pathin.size_default(); ++i) { + Geom::Curve const &c = pathin.at(i); + double dist = Geom::distance(p, c.boundsFast()); + if (dist >= mindist || pos == i) { + continue; + } + Geom::Coord t = c.nearestTime(p); + Geom::Coord d = Geom::distance(c.pointAt(t), p); + if (d < mindist) { + pos_b = i; + mindist = d; + } + } + if (Geom::are_near(Geom::distance(pos,pos_b), 1)) { + return true; + } + return false; +} + +Geom::Path removeIntersects(Geom::Path pathin, Geom::Path pathorig, size_t skipcross) +{ + Geom::Path out; + Geom::Crossings crossings = Geom::self_crossings(pathin); + size_t counter = 0; + for (auto cross : crossings) { + if (!Geom::are_near(cross.ta, cross.tb, 0.01)) { + size_t sizepath = size_nondegenerate(pathin); + double ta = cross.ta > cross.tb ? cross.tb : cross.ta; + double tb = cross.ta > cross.tb ? cross.ta : cross.tb; + if (!pathin.closed()) { + counter++; + if (skipcross >= counter) { + continue; + } + bool removeint = consecutiveCurves(pathorig, pathin.pointAt(ta)); + Geom::Path p0 = pathin; + if (removeint) { + Geom::Path p1 = pathin.portion(ta, tb); + if ((*p1.boundsFast()).maxExtent() > 0.01) { + p0 = pathin.portion(0, ta); + if (!Geom::are_near(tb, sizepath, 0.01)) { + Geom::Path p2 = pathin.portion(tb, sizepath); + p0.setFinal(p2.initialPoint()); + p0.append(p2); + } + } else { + skipcross++; + } + } else { + skipcross++; + } + out = removeIntersects(p0, pathorig, skipcross); + return out; + } + } + } + return pathin; +} */ + +Geom::Path removeIntersects(Geom::Path pathin) +{ + // I have a pending ping to moazin for 1.2 to fix open paths offeset self intesections (Jabiertxof) + // For 1.1 I comment the code because simply slow a lot or crash sometimes and never work really well + /* Geom::Path out; + Geom::Crossings crossings = Geom::self_crossings(pathin); + static size_t maxiter = 0; + if (!maxiter) { + maxiter = crossings.size(); + } + for (auto cross : crossings) { + maxiter--; + if (!maxiter) { + return pathin; + } + if (!Geom::are_near(cross.ta, cross.tb, 0.01)) { + size_t sizepath = size_nondegenerate(pathin); + double ta = cross.ta > cross.tb ? cross.tb : cross.ta; + double tb = cross.ta > cross.tb ? cross.ta : cross.tb; + if (!pathin.closed()) { + Geom::Path p0 = pathin; + Geom::Path p1 = pathin.portion(ta, tb); + p0 = pathin.portion(0, ta); + if (!Geom::are_near(tb, sizepath, 0.01)) { + Geom::Path p2 = pathin.portion(tb, sizepath); + p0.setFinal(p2.initialPoint()); + p0.append(p2); + } + out = removeIntersects(p0); + return out; + } + } + } */ + return pathin; +} + +static Geom::PathVector +sp_simplify_pathvector(Geom::PathVector original_pathv, double threshold) +{ + Path* pathliv = Path_for_pathvector(original_pathv); + pathliv->ConvertEvenLines(threshold); + pathliv->Simplify(threshold); + return Geom::parse_svg_path(pathliv->svg_dump_path()); +} + +Geom::PathVector +LPEOffset::doEffect_path(Geom::PathVector const & path_in) +{ + Geom::PathVector ret_closed; + Geom::PathVector ret_open; + SPItem *item = current_shape; + SPDocument *document = getSPDoc(); + if (!item || !document) { + return path_in; + } + // Get the used fillrule + SPCSSAttr *css; + const gchar *val; + css = sp_repr_css_attr (item->getRepr() , "style"); + val = sp_repr_css_property (css, "fill-rule", nullptr); + + fillrule = fill_nonZero; + if (val && strcmp (val, "evenodd") == 0) + { + fillrule = fill_oddEven; + } + + double tolerance = -1; + if (liveknot) { + tolerance = 3; + } + // Get the doc units offset + double to_offset = Inkscape::Util::Quantity::convert(offset, unit.get_abbreviation(), "px") / this->scale; + Geom::PathVector open_pathv; + Geom::PathVector closed_pathv; + Geom::PathVector mix_pathv; + Geom::PathVector mix_pathv_workon; + Geom::PathVector orig_pathv = pathv_to_linear_and_cubic_beziers(path_in); + helper_path = orig_pathv; + // Store separated open/closed paths + Geom::PathVector splitter; + for (auto &i : orig_pathv) { + // this improve offset in near closed paths + if (Geom::are_near(i.initialPoint(), i.finalPoint())) { + i.close(true); + } + if (i.closed()) { + closed_pathv.push_back(i); + } else { + open_pathv.push_back(i); + } + } + sp_flatten(closed_pathv, fillrule); + + // we flatten using original fill rule + mix_pathv = open_pathv; + for (auto path : closed_pathv) { + mix_pathv.push_back(path); + } + SPGroup *group = dynamic_cast<SPGroup *>(sp_lpe_item); + // Calculate the original pathvector used outside this function + // to calculate the offset + if (group) { + mix_pathv_all.insert(mix_pathv_all.begin(), mix_pathv.begin(), mix_pathv.end()); + } else { + mix_pathv_all = mix_pathv; + } + if (to_offset < 0) { + Geom::OptRect bbox = mix_pathv.boundsFast(); + if (bbox) { + (*bbox).expandBy(to_offset / 2.0); + if ((*bbox).hasZeroArea()) { + Geom::PathVector empty; + return empty; + } + } + } + for (auto pathin : closed_pathv) { + // Geom::OptRect bbox = pathin.boundsFast(); + // if (pbbox && (*pbbox).minExtent() > to_offset) { + mix_pathv_workon.push_back(pathin); + //} + } + mix_pathv_workon.insert(mix_pathv_workon.begin(), open_pathv.begin(), open_pathv.end()); + + if (offset == 0.0) { + if (is_load && offset_pt == Geom::Point(Geom::infinity(), Geom::infinity())) { + offset_pt = get_default_point(path_in); + if (_knot_entity) { + _knot_entity->knot_get(); + } + } + return path_in; + } + Geom::OptRect bbox = closed_pathv.boundsFast(); + double bboxsize = 0; + if (bbox) { + bboxsize = (*bbox).maxExtent(); + } + LineJoinType join = static_cast<LineJoinType>(linejoin_type.get_value()); + Geom::PathVector ret_closed_tmp; + if (to_offset > 0) { + for (auto &i : mix_pathv_workon) { + Geom::Path tmp = half_outline( + i, to_offset, (attempt_force_join ? std::numeric_limits<double>::max() : miter_limit), join, tolerance); + if (tmp.closed()) { + Geom::OptRect pbbox = tmp.boundsFast(); + if (pbbox && (*pbbox).minExtent() > to_offset) { + ret_closed_tmp.push_back(tmp); + } + } else { + Geom::Path tmp_b = half_outline(i.reversed(), to_offset, + (attempt_force_join ? std::numeric_limits<double>::max() : miter_limit), + join, tolerance); + Geom::PathVector switch_pv_a(tmp); + Geom::PathVector switch_pv_b(tmp_b); + double distance_b = Geom::distance(offset_pt, get_nearest_point(switch_pv_a, offset_pt)); + double distance_a = Geom::distance(offset_pt, get_nearest_point(switch_pv_b, offset_pt)); + if (distance_b < distance_a) { + ret_open.push_back(removeIntersects(tmp)); + } else { + ret_open.push_back(removeIntersects(tmp_b)); + } + } + } + sp_flatten(ret_closed_tmp, fill_nonZero); + for (auto path : ret_closed_tmp) { + ret_closed.push_back(path); + } + } else if (to_offset < 0) { + for (auto &i : mix_pathv_workon) { + double gap = 0.01; + if (legacytest_livarotonly) { + gap = 0; + } + Geom::Path tmp = + half_outline(i.reversed(), std::abs(to_offset + gap), + (attempt_force_join ? std::numeric_limits<double>::max() : miter_limit), join, tolerance); + // not remember why i instead tmp, afete 1.1 release we can switch to tmp to tests + if (i.closed()) { + Geom::PathVector out(tmp); + for (auto path : out) { + ret_closed.push_back(path); + } + } else { + Geom::Path tmp_b = half_outline(i, std::abs(to_offset), + (attempt_force_join ? std::numeric_limits<double>::max() : miter_limit), + join, tolerance); + Geom::PathVector switch_pv_a(tmp); + Geom::PathVector switch_pv_b(tmp_b); + double distance_b = Geom::distance(offset_pt, get_nearest_point(switch_pv_a, offset_pt)); + double distance_a = Geom::distance(offset_pt, get_nearest_point(switch_pv_b, offset_pt)); + if (distance_b < distance_a) { + ret_open.push_back(removeIntersects(tmp)); + } else { + ret_open.push_back(removeIntersects(tmp_b)); + } + } + } + if (!ret_closed.empty()) { + Geom::PathVector outline; + for (const auto &i : mix_pathv_workon) { + if (i.closed()) { + Geom::PathVector tmp = Inkscape::outline(i, std::abs(to_offset * 2), 4.0, join, + static_cast<LineCapType>(BUTT_FLAT), tolerance); + outline.insert(outline.begin(), tmp.begin(), tmp.end()); + } + } + sp_flatten(outline, fill_nonZero); + double size = Geom::L2(Geom::bounds_fast(ret_closed)->dimensions()); + size /= sp_lpe_item->i2doc_affine().descrim(); + ret_closed = sp_pathvector_boolop(outline, ret_closed, bool_op_diff, fill_nonZero, fill_nonZero, legacytest_livarotonly); + if (!liveknot && legacytest_livarotonly) { + ret_closed = sp_simplify_pathvector(ret_closed, 0.0003 * size); + } + } + } + ret_closed.insert(ret_closed.begin(), ret_open.begin(), ret_open.end()); + return ret_closed; +} + +void LPEOffset::addKnotHolderEntities(KnotHolder *knotholder, SPItem *item) +{ + _knot_entity = new OfS::KnotHolderEntityOffsetPoint(this); + _knot_entity->create(nullptr, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, + "LPEOffset", _("Offset point")); + _knot_entity->knot->setMode(Inkscape::CANVAS_ITEM_CTRL_MODE_COLOR); + _knot_entity->knot->setShape(Inkscape::CANVAS_ITEM_CTRL_SHAPE_CIRCLE); + _knot_entity->knot->setFill(0xFF6600FF, 0x4BA1C7FF, 0xCF1410FF, 0xFF6600FF); + _knot_entity->knot->setStroke(0x000000FF, 0x000000FF, 0x000000FF, 0x000000FF); + _knot_entity->knot->updateCtrl(); + offset_pt = Geom::Point(Geom::infinity(), Geom::infinity()); + knotholder->add(_knot_entity); +} + +namespace OfS { + +void KnotHolderEntityOffsetPoint::knot_set(Geom::Point const &p, Geom::Point const& /*origin*/, guint state) +{ + using namespace Geom; + LPEOffset* lpe = dynamic_cast<LPEOffset *>(_effect); + Geom::Point s = snap_knot_position(p, state); + double offset = lpe->sp_get_offset(s); + lpe->offset_pt = s; + if (lpe->update_on_knot_move) { + lpe->liveknot = true; + lpe->offset.param_set_value(offset); + sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, false); + } else { + lpe->liveknot = false; + } +} + +void KnotHolderEntityOffsetPoint::knot_ungrabbed(Geom::Point const &p, Geom::Point const &origin, guint state) +{ + LPEOffset *lpe = dynamic_cast<LPEOffset *>(_effect); + lpe->refresh_widgets = true; + lpe->liveknot = false; + using namespace Geom; + Geom::Point s = lpe->offset_pt; + double offset = lpe->sp_get_offset(s); + lpe->offset.param_set_value(offset); + sp_lpe_item_update_patheffect(SP_LPE_ITEM(item), false, false); +} + +Geom::Point KnotHolderEntityOffsetPoint::knot_get() const +{ + LPEOffset *lpe = dynamic_cast<LPEOffset *>(_effect); + if (!lpe) { + return Geom::Point(); + } + if (!lpe->update_on_knot_move) { + return lpe->offset_pt; + } + Geom::Point nearest = lpe->offset_pt; + if (nearest == Geom::Point(Geom::infinity(), Geom::infinity())) { + Geom::PathVector out; + SPGroup *group = dynamic_cast<SPGroup *>(item); + SPShape *shape = dynamic_cast<SPShape *>(item); + if (group) { + std::vector<SPItem *> item_list = sp_item_group_item_list(group); + for (auto child : item_list) { + SPShape *subchild = dynamic_cast<SPShape *>(child); + if (subchild) { + Geom::PathVector tmp = subchild->curve()->get_pathvector(); + out.insert(out.begin(), tmp.begin(), tmp.end()); + sp_flatten(out, fill_oddEven); + } + } + } else if (shape) { + SPCurve const *c = shape->curve(); + if (c) { + out = c->get_pathvector(); + } + } + if (!out.empty()) { + nearest = lpe->get_default_point(out); + } + } + lpe->offset_pt = nearest; + return lpe->offset_pt; +} + +} // namespace OfS +} //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 : |