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#define INKSCAPE_LPE_PERP_BISECTOR_CPP
/** \file
* LPE <perp_bisector> implementation.
*/
/*
* Authors:
* Maximilian Albert
* Johan Engelen
*
* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
* Copyright (C) Maximilin Albert 2008 <maximilian.albert@gmail.com>
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-perp_bisector.h"
#include "display/curve.h"
#include <libnr/n-art-bpath.h>
#include <2geom/path.h>
namespace Inkscape {
namespace LivePathEffect {
LPEPerpBisector::LPEPerpBisector(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
length_left(_("Length left"), _(""), "length-left", &wr, this, 200),
length_right(_("Length right"), _(""), "length-right", &wr, this, 200)
{
registerParameter( dynamic_cast<Parameter *>(&length_left) );
registerParameter( dynamic_cast<Parameter *>(&length_right) );
}
LPEPerpBisector::~LPEPerpBisector()
{
}
Geom::Point LPEPerpBisector::left_end(Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in) {
Geom::Point A(pwd2_in.firstValue());
Geom::Point B(pwd2_in.lastValue());
Geom::Point M((A + B)/2);
Geom::Point dir1((B - M).ccw());
if (dir1.length() > Geom::EPSILON)
dir1 = Geom::unit_vector(dir1) * length_left;
return M + dir1;
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEPerpBisector::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
Piecewise<D2<SBasis> > output;
Point A(pwd2_in.firstValue());
Point B(pwd2_in.lastValue());
Point M((A + B)/2);
Point dir1((B - M).ccw());
Point dir2((A - M).ccw());
if (dir1.length() > EPSILON)
dir1 = unit_vector(dir1) * length_left;
if (dir2.length() > EPSILON)
dir2 = unit_vector(dir2) * length_right;
Point C(M + dir1);
Point D(M + dir2);
output = Piecewise<D2<SBasis> >(D2<SBasis>(Linear(C[X], D[X]), Linear(C[Y], D[Y])));
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 :
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