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#define INKSCAPE_LPE_POWERSTROKE_CPP
/** \file
* @brief PowerStroke LPE implementation. Creates curves with modifiable stroke width.
*/
/* Authors:
* Johan Engelen <j.b.c.engelen@utwente.nl>
*
* Copyright (C) 2010 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-powerstroke.h"
#include "sp-shape.h"
#include "display/curve.h"
#include <2geom/path.h>
#include <2geom/piecewise.h>
#include <2geom/sbasis-geometric.h>
#include <2geom/svg-elliptical-arc.h>
#include <2geom/transforms.h>
namespace Inkscape {
namespace LivePathEffect {
LPEPowerStroke::LPEPowerStroke(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
offset_1(_("Start Offset"), _("Handle to control the distance of the offset from the curve"), "offset_1", &wr, this),
offset_2(_("End Offset"), _("Handle to control the distance of the offset from the curve"), "offset_2", &wr, this),
offset_3(_("End Offset"), _("Handle to control the distance of the offset from the curve"), "offset_3", &wr, this),
offset_points(_("Offset points"), _("Offset points"), "offset_points", &wr, this)
{
show_orig_path = true;
registerParameter( dynamic_cast<Parameter *>(&offset_1) );
registerParameter( dynamic_cast<Parameter *>(&offset_2) );
registerParameter( dynamic_cast<Parameter *>(&offset_3) );
registerParameter( dynamic_cast<Parameter *>(&offset_points) );
}
LPEPowerStroke::~LPEPowerStroke()
{
}
void
LPEPowerStroke::doOnApply(SPLPEItem *lpeitem)
{
offset_1.param_set_and_write_new_value(*(SP_SHAPE(lpeitem)->curve->first_point()));
offset_2.param_set_and_write_new_value(*(SP_SHAPE(lpeitem)->curve->last_point()));
offset_3.param_set_and_write_new_value(*(SP_SHAPE(lpeitem)->curve->last_point()));
}
static void append_half_circle(Geom::Piecewise<Geom::D2<Geom::SBasis> > &pwd2,
Geom::Point const center, Geom::Point const &dir) {
using namespace Geom;
double r = L2(dir);
SVGEllipticalArc cap(center + dir, r, r, angle_between(Point(1,0), dir), false, false, center - dir);
Piecewise<D2<SBasis> > cap_pwd2(cap.toSBasis());
pwd2.continuousConcat(cap_pwd2);
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEPowerStroke::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
double t1 = nearest_point(offset_1, pwd2_in);
double offset1 = L2(pwd2_in.valueAt(t1) - offset_1);
double t2 = nearest_point(offset_2, pwd2_in);
double offset2 = L2(pwd2_in.valueAt(t2) - offset_2);
double t3 = nearest_point(offset_3, pwd2_in);
double offset3 = L2(pwd2_in.valueAt(t3) - offset_3);
/*
unsigned number_of_points = offset_points.data.size();
double* t = new double[number_of_points];
Point* offset = new double[number_of_points];
for (unsigned i = 0; i < number_of_points; ++i) {
t[i] = nearest_point(offset_points.data[i], pwd2_in);
Point A = pwd2_in.valueAt(t[i]);
offset[i] = L2(A - offset_points.data[i]);
}
*/
// create stroke path where points (x,y) = (t, offset)
Path strokepath;
strokepath.start( Point(pwd2_in.domain().min(),0) );
strokepath.appendNew<Geom::LineSegment>( Point(t1, offset1) );
strokepath.appendNew<Geom::LineSegment>( Point(t2, offset2) );
strokepath.appendNew<Geom::LineSegment>( Point(t3, offset3) );
strokepath.appendNew<Geom::LineSegment>( Point(pwd2_in.domain().max(), 0) );
strokepath.appendNew<Geom::LineSegment>( Point(t3, -offset3) );
strokepath.appendNew<Geom::LineSegment>( Point(t2, -offset2) );
strokepath.appendNew<Geom::LineSegment>( Point(t1, -offset1) );
strokepath.close();
D2<Piecewise<SBasis> > patternd2 = make_cuts_independent(strokepath.toPwSb());
Piecewise<SBasis> x = Piecewise<SBasis>(patternd2[0]);
Piecewise<SBasis> y = Piecewise<SBasis>(patternd2[1]);
Piecewise<D2<SBasis> > der = unitVector(derivative(pwd2_in));
Piecewise<D2<SBasis> > n = rot90(der);
// output = pwd2_in + n * offset;
// append_half_circle(output, pwd2_in.lastValue(), n.lastValue() * offset);
// output.continuousConcat(reverse(pwd2_in - n * offset));
// append_half_circle(output, pwd2_in.firstValue(), -n.firstValue() * offset);
Piecewise<D2<SBasis> > output = compose(pwd2_in,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:encoding=utf-8:textwidth=99 :
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