From cca66b9ec4e494c1d919bff0f71a820d8afab1fa Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:24:48 +0200 Subject: Adding upstream version 1.2.2. Signed-off-by: Daniel Baumann --- src/live_effects/lpe-bendpath.cpp | 300 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 300 insertions(+) create mode 100644 src/live_effects/lpe-bendpath.cpp (limited to 'src/live_effects/lpe-bendpath.cpp') diff --git a/src/live_effects/lpe-bendpath.cpp b/src/live_effects/lpe-bendpath.cpp new file mode 100644 index 0000000..9aaeeff --- /dev/null +++ b/src/live_effects/lpe-bendpath.cpp @@ -0,0 +1,300 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) Johan Engelen 2007 + * Copyright (C) Steren Giannini 2008 + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include + +#include "display/curve.h" +#include "live_effects/lpe-bendpath.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 + +/* Theory in e-mail from J.F. Barraud +Let B be the skeleton path, and P the pattern (the path to be deformed). + +P is a map t --> P(t) = ( x(t), y(t) ). +B is a map t --> B(t) = ( a(t), b(t) ). + +The first step is to re-parametrize B by its arc length: this is the parametrization in which a point p on B is located by its distance s from start. One obtains a new map s --> U(s) = (a'(s),b'(s)), that still describes the same path B, but where the distance along B from start to +U(s) is s itself. + +We also need a unit normal to the path. This can be obtained by computing a unit tangent vector, and rotate it by 90�. Call this normal vector N(s). + +The basic deformation associated to B is then given by: + + (x,y) --> U(x)+y*N(x) + +(i.e. we go for distance x along the path, and then for distance y along the normal) + +Of course this formula needs some minor adaptations (as is it depends on the absolute position of P for instance, so a little translation is needed +first) but I think we can first forget about them. +*/ + +namespace Inkscape { +namespace LivePathEffect { + +namespace BeP { +class KnotHolderEntityWidthBendPath : public LPEKnotHolderEntity { + public: + KnotHolderEntityWidthBendPath(LPEBendPath * effect) : LPEKnotHolderEntity(effect) {} + ~KnotHolderEntityWidthBendPath() override + { + LPEBendPath *lpe = dynamic_cast (_effect); + lpe->_knot_entity = nullptr; + } + void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state) override; + Geom::Point knot_get() const override; + }; +} // BeP + +LPEBendPath::LPEBendPath(LivePathEffectObject *lpeobject) : + Effect(lpeobject), + bend_path(_("Bend path:"), _("Path along which to bend the original path"), "bendpath", &wr, this, "M0,0 L1,0"), + original_height(0.0), + prop_scale(_("_Width:"), _("Width of the path"), "prop_scale", &wr, this, 1.0), + scale_y_rel(_("W_idth in units of length"), _("Scale the width of the path in units of its length"), "scale_y_rel", &wr, this, false), + vertical_pattern(_("_Original path is vertical"), _("Rotates the original 90 degrees, before bending it along the bend path"), "vertical", &wr, this, false), + hide_knot(_("Hide width knot"), _("Hide width knot"),"hide_knot", &wr, this, false) +{ + registerParameter( &bend_path ); + registerParameter( &prop_scale); + registerParameter( &scale_y_rel); + registerParameter( &vertical_pattern); + registerParameter(&hide_knot); + + prop_scale.param_set_digits(3); + prop_scale.param_set_increments(0.01, 0.10); + + _knot_entity = nullptr; + _provides_knotholder_entities = true; + apply_to_clippath_and_mask = true; + concatenate_before_pwd2 = true; +} + +LPEBendPath::~LPEBendPath() += default; + + +bool +LPEBendPath::doOnOpen(SPLPEItem const *lpeitem) +{ + if (!is_load || is_applied) { + return false; + } + bend_path.reload(); + return false; +} + + +void +LPEBendPath::doBeforeEffect (SPLPEItem const* lpeitem) +{ + // get the item bounding box + original_bbox(lpeitem, false, true); + original_height = boundingbox_Y.max() - boundingbox_Y.min(); + if (is_load) { + bend_path.reload(); + } + if (_knot_entity) { + if (hide_knot) { + helper_path.clear(); + _knot_entity->knot->hide(); + } else { + _knot_entity->knot->show(); + } + _knot_entity->update_knot(); + } +} + +void LPEBendPath::transform_multiply(Geom::Affine const &postmul, bool /*set*/) +{ + Inkscape::Selection * selection = nullptr; + SPItem *linked = nullptr; + if (SP_ACTIVE_DESKTOP) { + selection = SP_ACTIVE_DESKTOP->getSelection(); + linked = dynamic_cast(bend_path.getObject()); + } + if (linked) { + linked->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + return; + } + if (sp_lpe_item && sp_lpe_item->pathEffectsEnabled() && sp_lpe_item->optimizeTransforms()) { + bend_path.param_transform_multiply(postmul, false); + } else if( //this allow transform user spected way when lpeitem and pathparamenter are both selected + sp_lpe_item && + sp_lpe_item->pathEffectsEnabled() && + linked && + (selection->includes(linked))) + { + Geom::Affine transformlpeitem = sp_item_transform_repr(sp_lpe_item).inverse() * postmul; + sp_lpe_item->transform *= transformlpeitem.inverse(); + sp_lpe_item->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG); + } +} + +Geom::Piecewise > +LPEBendPath::doEffect_pwd2 (Geom::Piecewise > const & pwd2_in) +{ + using namespace Geom; + + /* Much credit should go to jfb and mgsloan of lib2geom development for the code below! */ + Geom::Affine affine = bend_path.get_relative_affine(); + + if (bend_path.changed) { + uskeleton = arc_length_parametrization(Piecewise >(bend_path.get_pwd2() * affine),2,.1); + uskeleton = remove_short_cuts(uskeleton,.01); + n = rot90(derivative(uskeleton)); + n = force_continuity(remove_short_cuts(n,.01)); + + bend_path.changed = false; + } + + if (uskeleton.empty()) { + return pwd2_in; /// \todo or throw an exception instead? might be better to throw an exception so that the UI can display an error message or smth + } + + D2 > patternd2 = make_cuts_independent(pwd2_in); + Piecewise x = vertical_pattern.get_value() ? Piecewise(patternd2[1]) : Piecewise(patternd2[0]); + Piecewise y = vertical_pattern.get_value() ? Piecewise(patternd2[0]) : Piecewise(patternd2[1]); + + Interval bboxHorizontal = vertical_pattern.get_value() ? boundingbox_Y : boundingbox_X; + Interval bboxVertical = vertical_pattern.get_value() ? boundingbox_X : boundingbox_Y; + + //+0.1 in x fix bug #1658855 + //We use the group bounding box size or the path bbox size to translate well x and y + x-= bboxHorizontal.min() + 0.1; + y-= bboxVertical.middle(); + + double scaling = uskeleton.cuts.back()/bboxHorizontal.extent(); + + if (scaling != 1.0) { + x*=scaling; + } + + if ( scale_y_rel.get_value() ) { + y*=(scaling*prop_scale); + } else { + if (prop_scale != 1.0) y *= prop_scale; + } + + Piecewise > output = compose(uskeleton,x) + y*compose(n,x); + return output; +} + +void +LPEBendPath::resetDefaults(SPItem const* item) +{ + Effect::resetDefaults(item); + original_bbox(SP_LPE_ITEM(item), false, true); + + Geom::Point start(boundingbox_X.min(), (boundingbox_Y.max()+boundingbox_Y.min())/2); + Geom::Point end(boundingbox_X.max(), (boundingbox_Y.max()+boundingbox_Y.min())/2); + + if ( Geom::are_near(start,end) ) { + end += Geom::Point(1.,0.); + } + + Geom::Path path; + path.start( start ); + path.appendNew( end ); + bend_path.set_new_value( path.toPwSb(), true ); +} + +void +LPEBendPath::addCanvasIndicators(SPLPEItem const */*lpeitem*/, std::vector &hp_vec) +{ + hp_vec.push_back(helper_path); +} + +void +LPEBendPath::addKnotHolderEntities(KnotHolder *knotholder, SPItem *item) +{ + _knot_entity = new BeP::KnotHolderEntityWidthBendPath(this); + _knot_entity->create(nullptr, item, knotholder, Inkscape::CANVAS_ITEM_CTRL_TYPE_LPE, "LPE:WidthBend", + _("Change the width")); + knotholder->add(_knot_entity); + if (hide_knot) { + _knot_entity->knot->hide(); + _knot_entity->update_knot(); + } +} + +namespace BeP { + +void +KnotHolderEntityWidthBendPath::knot_set(Geom::Point const &p, Geom::Point const& /*origin*/, guint state) +{ + LPEBendPath *lpe = dynamic_cast (_effect); + + Geom::Point const s = snap_knot_position(p, state); + Geom::Path path_in = lpe->bend_path.get_pathvector().pathAt(Geom::PathVectorTime(0, 0, 0.0)); + Geom::Point ptA = path_in.pointAt(Geom::PathTime(0, 0.0)); + Geom::Point B = path_in.pointAt(Geom::PathTime(1, 0.0)); + Geom::Curve const *first_curve = &path_in.curveAt(Geom::PathTime(0, 0.0)); + Geom::CubicBezier const *cubic = dynamic_cast(&*first_curve); + Geom::Ray ray(ptA, B); + if (cubic) { + ray.setPoints(ptA, (*cubic)[1]); + } + ray.setAngle(ray.angle() + Geom::rad_from_deg(90)); + Geom::Point knot_pos = this->knot->pos * item->i2dt_affine().inverse(); + Geom::Coord nearest_to_ray = ray.nearestTime(knot_pos); + if(nearest_to_ray == 0){ + lpe->prop_scale.param_set_value(-Geom::distance(s , ptA)/(lpe->original_height/2.0)); + } else { + lpe->prop_scale.param_set_value(Geom::distance(s , ptA)/(lpe->original_height/2.0)); + } + if (!lpe->original_height) { + lpe->prop_scale.param_set_value(0); + } + Inkscape::Preferences *prefs = Inkscape::Preferences::get(); + prefs->setDouble("/live_effects/bend_path/width", lpe->prop_scale); + + sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true); +} + +Geom::Point +KnotHolderEntityWidthBendPath::knot_get() const +{ + LPEBendPath *lpe = dynamic_cast (_effect); + Geom::Path path_in = lpe->bend_path.get_pathvector().pathAt(Geom::PathVectorTime(0, 0, 0.0)); + Geom::Point ptA = path_in.pointAt(Geom::PathTime(0, 0.0)); + Geom::Point B = path_in.pointAt(Geom::PathTime(1, 0.0)); + Geom::Curve const *first_curve = &path_in.curveAt(Geom::PathTime(0, 0.0)); + Geom::CubicBezier const *cubic = dynamic_cast(&*first_curve); + Geom::Ray ray(ptA, B); + if (cubic) { + ray.setPoints(ptA, (*cubic)[1]); + } + ray.setAngle(ray.angle() + Geom::rad_from_deg(90)); + Geom::Point result_point = Geom::Point::polar(ray.angle(), (lpe->original_height/2.0) * lpe->prop_scale) + ptA; + lpe->helper_path.clear(); + if (!lpe->hide_knot) { + Geom::Path hp(result_point); + hp.appendNew(ptA); + lpe->helper_path.push_back(hp); + hp.clear(); + } + return result_point; +} +} // namespace BeP +} // 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 : -- cgit v1.2.3