#define INKSCAPE_LPE_PATH_LENGTH_CPP

#include <glibmm/i18n.h>

#include "live_effects/lpe-path_length.h"

#include "sp-metrics.h"

#include "2geom/sbasis-geometric.h"

namespace Inkscape {

namespace LivePathEffect {

LPEPathLength::LPEPathLength(LivePathEffectObject *lpeobject) :

Effect(lpeobject),

scale(_("Scale"), _("Scaling factor"), "scale", &wr, this, 1.0),

info_text(this),

unit(_("Unit"), _("Unit"), "unit", &wr, this),

display_unit(_("Display unit"), _("Print unit after path length"), "display_unit", &wr, this, true)

{

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

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

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

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

}

LPEPathLength::~LPEPathLength()

{

}

LPEPathLength::hideCanvasText() {

// this is only used in sp-lpe-item.cpp to hide the canvas text when the effect is invisible

info_text.param_setValue("");

}

Geom::Piecewise<Geom::D2<Geom::SBasis> >

LPEPathLength::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)

{

using namespace Geom;

/* convert the measured length to the correct unit ... */

double lengthval = Geom::length(pwd2_in) * scale;

gboolean success = sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), unit);

/* ... set it as the canvas text ... */

gchar *arc_length = g_strdup_printf("%.2f %s", lengthval,

display_unit ? (success ? unit.get_abbreviation() : "px") : "");

info_text.param_setValue(arc_length);

g_free(arc_length);

info_text.setPosAndAnchor(pwd2_in, 0.5, 10);

// TODO: how can we compute the area (such that cw turns don't count negative)?

// should we display the area here, too, or write a new LPE for this?

Piecewise<D2<SBasis> > A = integral(pwd2_in);

Point c;

double area;

if (centroid(pwd2_in, c, area)) {

//g_print ("Area is zero\n");

}

//g_print ("Area: %f\n", area);

return pwd2_in;

}

} //namespace LivePathEffect

} /* namespace Inkscape */