qgshistogram.h

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/***************************************************************************
                          qgshistogram.h
                          --------------
    begin                : May 2015
    copyright            : (C) 2015 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef QGSHISTOGRAM_H
#define QGSHISTOGRAM_H

#include <QList>

#include "qgis_core.h"
#include "qgsfeedback.h"

class QgsVectorLayer;


class CORE_EXPORT QgsHistogram
{
  public:

    QgsHistogram() = default;

    virtual ~QgsHistogram() = default;

    void setValues( const QList<double> &values );

    bool setValues( const QgsVectorLayer *layer, const QString &fieldOrExpression, QgsFeedback *feedback = nullptr );

    double optimalBinWidth() const;

    int optimalNumberBins() const;

    QList<double> binEdges( int bins ) const;

    QList<int> counts( int bins ) const;

  private:

    QList<double> mValues;
    double mMax = 0;
    double mMin = 0;
    double mIQR = 0;

    void prepareValues();

};

#endif // QGSHISTOGRAM_H