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#define INKSCAPE_LPE_ANGLE_BISECTOR_CPP
/** \file
* LPE <angle_bisector> implementation, used as an example for a base starting class
* when implementing new LivePathEffects.
*
* In vi, three global search-and-replaces will let you rename everything
* in this and the .h file:
*
* :%s/ANGLE_BISECTOR/YOURNAME/g
* :%s/AngleBisector/Yourname/g
* :%s/angle_bisector/yourname/g
*/
/*
* Authors:
* Johan Engelen
*
* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "live_effects/lpe-angle_bisector.h"
// You might need to include other 2geom files. You can add them here:
#include <2geom/path.h>
#include <2geom/sbasis-to-bezier.h>
namespace Inkscape {
namespace LivePathEffect {
namespace AB {
class KnotHolderEntityLeftEnd : public LPEKnotHolderEntity
{
public:
virtual void knot_set(Geom::Point const &p, Geom::Point const &origin, guint state);
virtual Geom::Point knot_get();
};
class KnotHolderEntityRightEnd : public LPEKnotHolderEntity
{
public:
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;
registerParameter( dynamic_cast<Parameter *>(&length_left) );
registerParameter( dynamic_cast<Parameter *>(&length_right) );
registerKnotHolderHandle(new AB::KnotHolderEntityLeftEnd(), _("Adjust the \"left\" end of the bisector"));
registerKnotHolderHandle(new AB::KnotHolderEntityRightEnd(), _("Adjust the \"right\" of the bisector"));
}
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);
}
namespace AB {
// TODO: make this more generic
static LPEAngleBisector *
get_effect(SPItem *item)
{
Effect *effect = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
if (effect->effectType() != ANGLE_BISECTOR) {
g_print ("Warning: Effect is not of type LPEAngleBisector!\n");
return NULL;
}
return static_cast<LPEAngleBisector *>(effect);
}
void
KnotHolderEntityLeftEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint /*state*/)
{
LPEAngleBisector *lpe = get_effect(item);
Geom::Point const s = snap_knot_position(p);
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);
}
void
KnotHolderEntityRightEnd::knot_set(Geom::Point const &p, Geom::Point const &/*origin*/, guint /*state*/)
{
LPEAngleBisector *lpe = get_effect(item);
Geom::Point const s = snap_knot_position(p);
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 = get_effect(item);
return lpe->ptA - lpe->dir * lpe->length_left;
}
Geom::Point
KnotHolderEntityRightEnd::knot_get()
{
LPEAngleBisector *lpe = get_effect(item);
return lpe->ptA + lpe->dir * lpe->length_right;
}
} // namespace AB
/* ######################## */
} //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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