qgshistogramwidget.h

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/***************************************************************************
                         qgshistogramwidget.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 QGSHISTOGRAMWIDGET_H
#define QGSHISTOGRAMWIDGET_H

#include "ui_qgshistogramwidgetbase.h"
#include "qgis.h"

#include "qgshistogram.h"
#include "qgsstatisticalsummary.h"
#include "qgsgraduatedsymbolrenderer.h"
#include <QPen>
#include <QBrush>
#include "qgis_gui.h"

class QgsVectorLayer;
class QgsGraduatedSymbolRenderer;
class QwtPlotPicker;
class QwtPlotMarker;
class QwtPlot;
class HistogramItem;
class QwtPlotHistogram;

// fix for qwt5/qwt6 QwtDoublePoint vs. QPointF
typedef QPointF QwtDoublePoint;

class GUI_EXPORT QgsHistogramWidget : public QWidget, private Ui::QgsHistogramWidgetBase
{
    Q_OBJECT

  public:

    QgsHistogramWidget( QWidget *parent SIP_TRANSFERTHIS = nullptr, QgsVectorLayer *layer = nullptr, const QString &fieldOrExp = QString() );

    ~QgsHistogramWidget() override;

    QgsVectorLayer *layer() { return mVectorLayer; }

    QString sourceFieldExp() const { return mSourceFieldExp; }

    void setPen( const QPen &pen ) { mPen = pen; }

    QPen pen() const { return mPen; }

    void setBrush( const QBrush &brush ) { mBrush = brush; }

    QBrush brush() const { return mBrush; }

    void setGraduatedRanges( const QgsRangeList &ranges );

    QgsRangeList graduatedRanges() const { return mRanges; }

    QString xAxisTitle() const { return mXAxisTitle; }

    void setXAxisTitle( const QString &title ) { mXAxisTitle = title; }

    QString yAxisTitle() const { return mYAxisTitle; }

    void setYAxisTitle( const QString &title ) { mYAxisTitle = title; }

  public slots:

    void refreshValues();

    void refresh();

    void setLayer( QgsVectorLayer *layer );

    void setSourceFieldExp( const QString &fieldOrExp );

  protected:

    virtual void drawHistogram();

    QwtPlot *mPlot = nullptr;
    QgsRangeList mRanges;
    QList< QwtPlotMarker * > mRangeMarkers;

  private:

    QgsVectorLayer *mVectorLayer = nullptr;
    QString mSourceFieldExp;
    QList<double> mValues;
    QgsStatisticalSummary mStats;
    QgsHistogram mHistogram;
    QVector<QColor> mHistoColors;
    QPen mPen;
    QBrush mBrush;
    QPen mMeanPen;
    QPen mStdevPen;
    QPen mGridPen;
    QString mXAxisTitle;
    QString mYAxisTitle;

    void clearHistogram();

    QwtPlotHistogram *createPlotHistogram( const QString &title, const QBrush &brush, const QPen &pen = Qt::NoPen ) const;

};

#endif //QGSHISTOGRAMWIDGET_H