ColourScale.h

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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006-2016 Chris Cannam and QMUL.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef COLOUR_SCALE_H
#define COLOUR_SCALE_H

#include "ColourMapper.h"

enum class ColourScaleType {
    Linear,
    Meter,
    Log,
    Phase,
    PlusMinusOne,
    Absolute
};

class ColourScale
{
public:
    struct Parameters {
        Parameters() : colourMap(0), scaleType(ColourScaleType::Linear),
                       minValue(0.0), maxValue(1.0), inverted(false),
                       threshold(0.0), gain(1.0), multiple(1.0) { }

        int colourMap;
        
        ColourScaleType scaleType;
        
        double minValue;
        
        double maxValue;

        bool inverted;

        double threshold;

        double gain;

        double multiple;
    };
    
    ColourScale(Parameters parameters);
    ~ColourScale();

    ColourScale(const ColourScale &) = default;
    ColourScale &operator=(const ColourScale &) = default;

    ColourScaleType getScale() const;
    
    int getPixel(double value) const;

    QColor getColourForPixel(int pixel, int rotation) const;
    
    QColor getColour(double value, int rotation) const {
        return getColourForPixel(getPixel(value), rotation);
    }

private:
    Parameters m_params;
    ColourMapper m_mapper;
    double m_mappedMin;
    double m_mappedMax;
    static int m_maxPixel;
};

#endif