#include <glibmm/i18n.h>

#include "live_effects/lpe-angle_bisector.h"

#include <2geom/path.h>

#include <2geom/sbasis-to-bezier.h>

#include "sp-lpe-item.h"

#include "knot-holder-entity.h"

#include "knotholder.h"

namespace Inkscape {

namespace LivePathEffect {

namespace AB {

class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity {

public:

KnotHolderEntityLeftEnd(LPEAngleBisector* effect) : LPEKnotHolderEntity(effect) {};

virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);

virtual Geom::Point knot_get();

};

class KnotHolderEntityRightEnd : public LPEKnotHolderEntity {

public:

KnotHolderEntityRightEnd(LPEAngleBisector* effect) : LPEKnotHolderEntity(effect) {};

virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);

virtual Geom::Point knot_get();

};

} // namespace TtC

LPEAngleBisector::LPEAngleBisector(LivePathEffectObject *lpeobject) :

Effect(lpeobject),

length_left(_("Length left:"), _("Specifies the left end of the bisector"), "length-left", &wr, this, 0),

length_right(_("Length right:"), _("Specifies the right end of the bisector"), "length-right", &wr, this, 250)

{

show_orig_path = true;

_provides_knotholder_entities = true;

registerParameter( dynamic_cast<Parameter *>(&length_left) );

registerParameter( dynamic_cast<Parameter *>(&length_right) );

}

LPEAngleBisector::~LPEAngleBisector()

{

}

std::vector<Geom::Path>

LPEAngleBisector::doEffect_path (std::vector<Geom::Path> const & path_in)

{

using namespace Geom;

std::vector<Geom::Path> path_out;

// we assume that the path has >= 3 nodes

ptA = path_in[0].pointAt(1);

Point B = path_in[0].initialPoint();

Point C = path_in[0].pointAt(2);

double angle = angle_between(B - ptA, C - ptA);

dir = unit_vector(B - ptA) * Rotate(angle/2);

Geom::Point D = ptA - dir * length_left;

Geom::Point E = ptA + dir * length_right;

Piecewise<D2<SBasis> > output = Piecewise<D2<SBasis> >(D2<SBasis>(Linear(D[X], E[X]), Linear(D[Y], E[Y])));

return path_from_piecewise(output, LPE_CONVERSION_TOLERANCE);

}

LPEAngleBisector::addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item) {

{

KnotHolderEntity *e = new AB::KnotHolderEntityLeftEnd(this);

e->create( desktop, item, knotholder, Inkscape::CTRL_TYPE_UNKNOWN,

_("Adjust the \"left\" end of the bisector") );

knotholder->add(e);

}

{

KnotHolderEntity *e = new AB::KnotHolderEntityRightEnd(this);

e->create( desktop, item, knotholder, Inkscape::CTRL_TYPE_UNKNOWN,

_("Adjust the \"right\" of the bisector") );

knotholder->add(e);

}

};

namespace AB {

KnotHolderEntityLeftEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)

{

LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);

Geom::Point const s = snap_knot_position(p, state);

double lambda = Geom::nearest_point(s, lpe->ptA, lpe->dir);

lpe->length_left.param_set_value(-lambda);

sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);

}

KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint state)

{

LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);

Geom::Point const s = snap_knot_position(p, state);

double lambda = Geom::nearest_point(s, lpe->ptA, lpe->dir);

lpe->length_right.param_set_value(lambda);

sp_lpe_item_update_patheffect (SP_LPE_ITEM(item), false, true);

}

Geom::Point

KnotHolderEntityLeftEnd::knot_get()

{

LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);

return lpe->ptA - lpe->dir * lpe->length_left;

}

Geom::Point

KnotHolderEntityRightEnd::knot_get()

{

LPEAngleBisector *lpe = dynamic_cast<LPEAngleBisector *>(_effect);

return lpe->ptA + lpe->dir * lpe->length_right;

}

} // namespace AB

} //namespace LivePathEffect

} /* namespace Inkscape */