Sources_For_Linux/Qwt/include/qwt_polar_picker.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * QwtPolar Widget Library
 * Copyright (C) 2008   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_POLAR_PICKER_H
#define QWT_POLAR_PICKER_H

#include "qwt_polar_global.h"
#include "qwt_picker.h"
#include <qvector.h>
#include <qpainterpath.h>

class QwtPolarPlot;
class QwtPolarCanvas;
class QwtPointPolar;

/*!
  \brief QwtPolarPicker provides selections on a plot canvas

  QwtPolarPicker is a QwtPicker tailored for selections on
  a polar plot canvas.
*/

class QWT_POLAR_EXPORT QwtPolarPicker: public QwtPicker
{
    Q_OBJECT

public:
    explicit QwtPolarPicker( QwtPolarCanvas * );
    virtual ~QwtPolarPicker();

    explicit QwtPolarPicker(
        RubberBand rubberBand, DisplayMode trackerMode,
        QwtPolarCanvas * );

    QwtPolarPlot *plot();
    const QwtPolarPlot *plot() const;

    QwtPolarCanvas *canvas();
    const QwtPolarCanvas *canvas() const;

    virtual QRect pickRect() const;

Q_SIGNALS:

    /*!
      A signal emitted in case of selectionFlags() & PointSelection.
      \param pos Selected point
    */
    void selected( const QwtPointPolar &pos );

    /*!
      A signal emitting the selected points,
      at the end of a selection.

      \param points Selected points
    */
    void selected( const QVector<QwtPointPolar> &points );

    /*!
      A signal emitted when a point has been appended to the selection

      \param pos Position of the appended point.
      \sa append(). moved()
    */
    void appended( const QwtPointPolar &pos );

    /*!
      A signal emitted whenever the last appended point of the
      selection has been moved.

      \param pos Position of the moved last point of the selection.
      \sa move(), appended()
    */
    void moved( const QwtPointPolar &pos );

protected:
    QwtPointPolar invTransform( const QPoint & ) const;

    virtual QwtText trackerText( const QPoint & ) const;
    virtual QwtText trackerTextPolar( const QwtPointPolar & ) const;

    virtual void move( const QPoint & );
    virtual void append( const QPoint & );
    virtual bool end( bool ok = true );

private:
    virtual QPainterPath pickArea() const;

    class PrivateData;
    PrivateData *d_data;
};

#endif