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// SPDX-License-Identifier: GPL-2.0-or-later
/**
* @file
* Inspired by Hofstadter's 'Goedel Escher Bach', chapter V.
*/
/* Authors:
* Johan Engelen <j.b.c.engelen@utwente.nl>
*
* Copyright (C) 2007-2009 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "live_effects/lpe-recursiveskeleton.h"
#include <2geom/bezier-to-sbasis.h>
// TODO due to internal breakage in glibmm headers, this must be last:
#include <glibmm/i18n.h>
namespace Inkscape {
namespace LivePathEffect {
LPERecursiveSkeleton::LPERecursiveSkeleton(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
iterations(_("Iterations:"), _("recursivity"), "iterations", &wr, this, 2)
{
show_orig_path = true;
concatenate_before_pwd2 = true;
iterations.param_make_integer(true);
iterations.param_set_range(1, 15);
registerParameter(&iterations);
}
LPERecursiveSkeleton::~LPERecursiveSkeleton()
= default;
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPERecursiveSkeleton::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
Piecewise<D2<SBasis> > output;
double prop_scale = 1.0;
D2<Piecewise<SBasis> > patternd2 = make_cuts_independent(pwd2_in);
Piecewise<SBasis> x0 = false /*vertical_pattern.get_value()*/ ? Piecewise<SBasis>(patternd2[1]) : Piecewise<SBasis>(patternd2[0]);
Piecewise<SBasis> y0 = false /*vertical_pattern.get_value()*/ ? Piecewise<SBasis>(patternd2[0]) : Piecewise<SBasis>(patternd2[1]);
OptInterval pattBndsX = bounds_exact(x0);
OptInterval pattBndsY = bounds_exact(y0);
if ( !pattBndsX || !pattBndsY) {
return pwd2_in;
}
x0 -= pattBndsX->min();
y0 -= pattBndsY->middle();
double noffset = 0;//normal_offset;
double toffset = 0;//tang_offset;
if (false /*prop_units.get_value()*/){
noffset *= pattBndsY->extent();
toffset *= pattBndsX->extent();
}
y0+=noffset;
output = pwd2_in;
for (int i = 0; i < iterations; ++i) {
std::vector<Piecewise<D2<SBasis> > > skeleton = split_at_discontinuities(output);
output.clear();
for (auto path_i : skeleton){
Piecewise<SBasis> x = x0;
Piecewise<SBasis> y = y0;
Piecewise<D2<SBasis> > uskeleton = arc_length_parametrization(path_i,2,.1);
uskeleton = remove_short_cuts(uskeleton,.01);
Piecewise<D2<SBasis> > n = rot90(derivative(uskeleton));
n = force_continuity(remove_short_cuts(n,.1));
double scaling = (uskeleton.domain().extent() - toffset)/pattBndsX->extent();
// TODO investigate why pattWidth is not being used:
// - Doesn't appear to have been used anywhere in bzr history (Alex V: 2013-03-16)
// double pattWidth = pattBndsX->extent() * scaling;
if (scaling != 1.0) {
x*=scaling;
}
if ( true /*scale_y_rel.get_value()*/ ) {
y*=(scaling*prop_scale);
} else {
if (prop_scale != 1.0) y *= prop_scale;
}
x += toffset;
output.concat(compose(uskeleton,x)+y*compose(n,x));
}
}
return output;
}
} //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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