palette.h

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#ifndef PALETTE_H
#define PALETTE_H

#include <QMap>
#include <QColor>

namespace frechet { namespace view {
class Palette
{
private:
    typedef QMap<size_t,QColor> ColorMap;
    ColorMap map;

    QColor randomColor();

    QColor nextColor(size_t key);

    void stronger(QColor& col) {
        if (col.hslSaturationF() < 0.5)
            addLightness(col,+0.5);
    }

    void weaker(QColor& col) {
        if (col.hslSaturationF() > 0.5)
            addLightness(col,-0.5);
    }

    void addLightness(QColor& col, double diff) {
        col.setHslF(col.hslHueF(), col.hslSaturationF()+diff, col.lightnessF(), col.alphaF());
    }

public:
    Palette();

    QColor operator[] (size_t key);

    static QColor toColor(int x, int sat=220, int light=200);

    void clear();
};

} } // namespace

#endif // PALETTE_H