XXRainbow.h

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#ifndef XXRainbowH
#define XXRainbowH
 
#include "XXGuiExportDef.h"
 
#include <QColor>
#include <QMap>
 
namespace XX
{
 
   class XXGUI_DECLSPEC Rainbow
   {
   public:
      Rainbow(quint64 maxIndex, quint16 shade = 200);
 
   public:
      const quint64& getMaxIndex() const;
      void changeShade(quint16 shade);
      QColor getColor(const quint64 offset = 0);
      QColor advanceColor(const quint64& offset = 1);
      QColor lookup(const quint64& value, bool wrap);
 
   private:
      using ColorMap = QMap<quint64, QColor>;
 
      struct Section
      {
         QColor color;
         int variableIndex;
         bool up;
 
         using List = QList<Section>;
      };
 
   private:
      quint64 maxIndex;
      ColorMap colorMap;
      quint64 currentIndex;
   };
} // namespace XX
 
#endif // NOT XXRainbowH