lpe-parallel.cpp revision 25ad3718fb4b96b39930af8e043c8ee1e624fd10
#define INKSCAPE_LPE_PARALLEL_CPP
/** \file
* LPE <parallel> implementation
*/
/*
* Authors:
* Maximilian Albert
*
* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
* Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-parallel.h"
#include "sp-shape.h"
#include "display/curve.h"
#include <2geom/path.h>
#include <2geom/transforms.h>
namespace Inkscape {
namespace LivePathEffect {
namespace Pl {
class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity
{
public:
virtual void knot_set(NR::Point const &p, NR::Point const &origin, guint state);
virtual NR::Point knot_get();
};
class KnotHolderEntityRightEnd : public LPEKnotHolderEntity
{
public:
virtual void knot_set(NR::Point const &p, NR::Point const &origin, guint state);
virtual NR::Point knot_get();
};
} // namespace Pl
LPEParallel::LPEParallel(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
// initialise your parameters here:
offset_pt(_("Offset"), _("Adjust the offset"), "offset_pt", &wr, this),
length_left(_("Length left"), _("Specifies the left end of the parallel"), "length-left", &wr, this, 150),
length_right(_("Length right"), _("Specifies the right end of the parallel"), "length-right", &wr, this, 150)
{
show_orig_path = true;
registerParameter(dynamic_cast<Parameter *>(&offset_pt));
registerParameter( dynamic_cast<Parameter *>(&length_left) );
registerParameter( dynamic_cast<Parameter *>(&length_right) );
registerKnotHolderHandle(new Pl::KnotHolderEntityLeftEnd(), _("Adjust the \"left\" end of the parallel"));
registerKnotHolderHandle(new Pl::KnotHolderEntityRightEnd(), _("Adjust the \"right\" end of the parallel"));
}
LPEParallel::~LPEParallel()
{
}
void
LPEParallel::doOnApply (SPLPEItem *lpeitem)
{
SPCurve *curve = SP_SHAPE(lpeitem)->curve;
A = curve->first_point();
B = curve->last_point();
dir = unit_vector(B - A);
offset_pt.param_set_and_write_new_value((A + B)/2 + dir.ccw() * 100);
}
Geom::Piecewise<Geom::D2<Geom::SBasis> >
LPEParallel::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
{
using namespace Geom;
Piecewise<D2<SBasis> > output;
A = pwd2_in.firstValue();
B = pwd2_in.lastValue();
dir = unit_vector(B - A);
C = offset_pt - dir * length_left;
D = offset_pt + dir * length_right;
output = Piecewise<D2<SBasis> >(D2<SBasis>(Linear(C[X], D[X]), Linear(C[Y], D[Y])));
return output + dir;
}
namespace Pl {
// TODO: make this more generic
static LPEParallel *
get_effect(SPItem *item)
{
Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
if (effect->effectType() != PARALLEL) {
g_print ("Warning: Effect is not of type LPEParallel!\n");
return NULL;
}
return static_cast<LPEParallel *>(effect);
}
void
KnotHolderEntityLeftEnd::knot_set(NR::Point const &p, NR::Point const &/*origin*/, guint /*state*/)
{
using namespace Geom;
LPEParallel *lpe = get_effect(item);
double lambda = L2(p - lpe->offset_pt) * sgn(dot(p.to_2geom() - lpe->offset_pt, lpe->dir));
lpe->length_left.param_set_value(-lambda);
sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
}
void
KnotHolderEntityRightEnd::knot_set(NR::Point const &p, NR::Point const &/*origin*/, guint /*state*/)
{
using namespace Geom;
LPEParallel *lpe = get_effect(item);
double lambda = L2(p - lpe->offset_pt) * sgn(dot(p.to_2geom() - lpe->offset_pt, lpe->dir));
lpe->length_right.param_set_value(lambda);
sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);
}
NR::Point
KnotHolderEntityLeftEnd::knot_get()
{
LPEParallel *lpe = get_effect(item);
return lpe->C;
}
NR::Point
KnotHolderEntityRightEnd::knot_get()
{
LPEParallel *lpe = get_effect(item);
return lpe->D;
}
} // namespace Pl
/* ######################## */
} //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 :