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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* LPE <path_length> implementation.
*/
/*
* Authors:
* Maximilian Albert <maximilian.albert@gmail.com>
* Johan Engelen
*
* Copyright (C) 2007-2008 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "live_effects/lpe-path_length.h"
#include "util/units.h"
// TODO due to internal breakage in glibmm headers, this must be last:
#include <glibmm/i18n.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(&scale);
registerParameter(&info_text);
registerParameter(&unit);
registerParameter(&display_unit);
}
LPEPathLength::~LPEPathLength()
= default;
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;
lengthval = Inkscape::Util::Quantity::convert(lengthval, "px", unit.get_abbreviation());
/* ... set it as the canvas text ... */
gchar *arc_length = g_strdup_printf("%.2f %s", lengthval,
display_unit ? unit.get_abbreviation() : "");
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);
if (!this->isVisible()) {
info_text.param_setValue("");
}
return pwd2_in;
}
} //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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