SparseValueModel.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 Chris Cannam.
    
    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 _SPARSE_VALUE_MODEL_H_
#define _SPARSE_VALUE_MODEL_H_

#include "SparseModel.h"
#include "base/UnitDatabase.h"

#include <cmath>

template <typename PointType>
class SparseValueModel : public SparseModel<PointType>
{
public:
    SparseValueModel(size_t sampleRate, size_t resolution,
                     bool notifyOnAdd = true) :
        SparseModel<PointType>(sampleRate, resolution, notifyOnAdd),
        m_valueMinimum(0.f),
        m_valueMaximum(0.f),
        m_haveExtents(false)
    { }

    SparseValueModel(size_t sampleRate, size_t resolution,
                     float valueMinimum, float valueMaximum,
                     bool notifyOnAdd = true) :
        SparseModel<PointType>(sampleRate, resolution, notifyOnAdd),
        m_valueMinimum(valueMinimum),
        m_valueMaximum(valueMaximum),
        m_haveExtents(true)
    { }

    using SparseModel<PointType>::m_points;
    using SparseModel<PointType>::modelChanged;
    using SparseModel<PointType>::getPoints;
    using SparseModel<PointType>::tr;

    QString getTypeName() const { return tr("Sparse Value"); }

    virtual float getValueMinimum() const { return m_valueMinimum; }
    virtual float getValueMaximum() const { return m_valueMaximum; }

    virtual QString getScaleUnits() const { return m_units; }
    virtual void setScaleUnits(QString units) {
        m_units = units;
        UnitDatabase::getInstance()->registerUnit(units);
    }

    virtual void addPoint(const PointType &point)
    {
        bool allChange = false;

        if (!std::isnan(point.value) && !std::isinf(point.value)) {
            if (!m_haveExtents || point.value < m_valueMinimum) {
                m_valueMinimum = point.value; allChange = true;
//                std::cerr << "addPoint: value min = " << m_valueMinimum << std::endl;
            }
            if (!m_haveExtents || point.value > m_valueMaximum) {
                m_valueMaximum = point.value; allChange = true;
//                std::cerr << "addPoint: value max = " << m_valueMaximum << " (min = " << m_valueMinimum << ")" << std::endl;
            }
            m_haveExtents = true;
        }

        SparseModel<PointType>::addPoint(point);
        if (allChange) emit modelChanged();
    }

    virtual void deletePoint(const PointType &point)
    {
        SparseModel<PointType>::deletePoint(point);

        if (point.value == m_valueMinimum ||
            point.value == m_valueMaximum) {

            float formerMin = m_valueMinimum, formerMax = m_valueMaximum;

            for (typename SparseModel<PointType>::PointList::const_iterator i
                     = m_points.begin();
                 i != m_points.end(); ++i) {

                if (i == m_points.begin() || i->value < m_valueMinimum) {
                    m_valueMinimum = i->value;
//                    std::cerr << "deletePoint: value min = " << m_valueMinimum << std::endl;
                } 
                if (i == m_points.begin() || i->value > m_valueMaximum) {
                    m_valueMaximum = i->value;
//                    std::cerr << "deletePoint: value max = " << m_valueMaximum << std::endl;
                } 
            }

            if (formerMin != m_valueMinimum || formerMax != m_valueMaximum) {
                emit modelChanged();
            }
        }
    }

    virtual void toXml(QTextStream &stream,
                       QString indent = "",
                       QString extraAttributes = "") const
    {
        std::cerr << "SparseValueModel::toXml: extraAttributes = \"" 
                  << extraAttributes.toStdString() << std::endl;

        SparseModel<PointType>::toXml
            (stream,
             indent,
             QString("%1 minimum=\"%2\" maximum=\"%3\" units=\"%4\"")
             .arg(extraAttributes).arg(m_valueMinimum).arg(m_valueMaximum)
             .arg(this->encodeEntities(m_units)));
    }

protected:
    float m_valueMinimum;
    float m_valueMaximum;
    bool m_haveExtents;
    QString m_units;
};


#endif

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