view data/model/SparseValueModel.h @ 537:3cc4b7cd2aa5

* Merge from one-fftdataserver-per-fftmodel branch.  This bit of
reworking (which is not described very accurately by the title of
the branch) turns the MatrixFile object into something that either
reads or writes, but not both, and separates the FFT file cache
reader and writer implementations separately.  This allows the
FFT data server to have a single thread owning writers and one reader
per "customer" thread, and for all locking to be vastly simplified
and concentrated in the data server alone (because none of the
classes it makes use of is used in more than one thread at a time).
The result is faster and more trustworthy code.

/* -*- 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>

/**
 * Model containing sparse data (points with some properties) of which
 * one of the properties is an arbitrary float value.  The other
 * properties depend on the point type.
 */

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