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/**
* \file
*
* \author Mattia Basaglia
*
* \copyright Copyright (C) 2013-2020 Mattia Basaglia
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef COLOR_UTILS_HPP
#define COLOR_UTILS_HPP
#include <QColor>
#include <qmath.h>
#include "QtColorWidgets/colorwidgets_global.hpp"
namespace color_widgets {
namespace detail {
inline qreal color_chromaF(const QColor& c)
{
qreal max = qMax(c.redF(), qMax(c.greenF(), c.blueF()));
qreal min = qMin(c.redF(), qMin(c.greenF(), c.blueF()));
return max - min;
}
inline qreal color_lumaF(const QColor& c)
{
return 0.30 * c.redF() + 0.59 * c.greenF() + 0.11 * c.blueF();
}
QColor color_from_lch(qreal hue, qreal chroma, qreal luma, qreal alpha = 1 );
inline QColor rainbow_lch(qreal hue)
{
return color_from_lch(hue,1,1);
}
inline QColor rainbow_hsv(qreal hue)
{
return QColor::fromHsvF(hue,1,1);
}
inline qreal color_lightnessF(const QColor& c)
{
return ( qMax(c.redF(),qMax(c.greenF(),c.blueF())) +
qMin(c.redF(),qMin(c.greenF(),c.blueF())) ) / 2;
}
inline qreal color_HSL_saturationF(const QColor& col)
{
qreal c = color_chromaF(col);
qreal l = color_lightnessF(col);
if ( qFuzzyCompare(l+1,1) || qFuzzyCompare(l+1,2) )
return 0;
return c / (1-qAbs(2*l-1));
}
QCP_EXPORT QColor color_from_hsl(qreal hue, qreal sat, qreal lig, qreal alpha = 1 );
} // namespace detail
} // namespace color_widgets
#endif // COLOR_UTILS_HPP
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