QGIS/external/qwt-6.3.0/qwt_plot_intervalcurve.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   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_PLOT_INTERVAL_CURVE_H
#define QWT_PLOT_INTERVAL_CURVE_H

#include "qwt_global.h"
#include "qwt_plot_seriesitem.h"

class QwtIntervalSymbol;
template< typename T > class QwtSeriesData;

/*!
   \brief QwtPlotIntervalCurve represents a series of samples, where each value
         is associated with an interval ( \f$[y1,y2] = f(x)\f$ ).

   The representation depends on the style() and an optional symbol()
   that is displayed for each interval. QwtPlotIntervalCurve might be used
   to display error bars or the area between 2 curves.
 */
class QWT_EXPORT QwtPlotIntervalCurve
    : public QwtPlotSeriesItem
    , public QwtSeriesStore< QwtIntervalSample >
{
  public:
    /*!
        \brief Curve styles.
        The default setting is QwtPlotIntervalCurve::Tube.

        \sa setStyle(), style()
     */
    enum CurveStyle
    {
        /*!
           Don't draw a curve. Note: This doesn't affect the symbols.
         */
        NoCurve,

        /*!
           Build 2 curves from the upper and lower limits of the intervals
           and draw them with the pen(). The area between the curves is
           filled with the brush().
         */
        Tube,

        /*!
           Styles >= QwtPlotIntervalCurve::UserCurve are reserved for derived
           classes that overload drawSeries() with
           additional application specific curve types.
         */
        UserCurve = 100
    };

    /*!
        Attributes to modify the drawing algorithm.
        \sa setPaintAttribute(), testPaintAttribute()
     */
    enum PaintAttribute
    {
        /*!
           Clip polygons before painting them. In situations, where points
           are far outside the visible area (f.e when zooming deep) this
           might be a substantial improvement for the painting performance.
         */
        ClipPolygons = 0x01,

        //! Check if a symbol is on the plot canvas before painting it.
        ClipSymbol   = 0x02,

        /*!
           Fill the tube with horizontal or vertical lines and unite
           overlapping border lines. This attribute is useful for large
           data sets, where consecutive samples are often mapped to the same
           coordinate.

           Beside other minor visual differences the filling is always
           monochrome - using brush().color().

           This algorithm is very fast and effective and can be used inside
           a replot cycle. In the worst case the number of lines to be rendered
           will be 5 times the ( width/height - depending on the orientation() )
           of the plot canvas.

           \note Has only an effect, when drawing to a paint device
                 in integer coordinates ( f.e. all widgets on screen ).

           \sa QwtPlotCurve::FilterPointsAggressive
         */
        TubeAsLines = 0x10
    };

    Q_DECLARE_FLAGS( PaintAttributes, PaintAttribute )

    explicit QwtPlotIntervalCurve( const QString& title = QString() );
    explicit QwtPlotIntervalCurve( const QwtText& title );

    virtual ~QwtPlotIntervalCurve();

    virtual int rtti() const QWT_OVERRIDE;

    void setPaintAttribute( PaintAttribute, bool on = true );
    bool testPaintAttribute( PaintAttribute ) const;

    void setSamples( const QVector< QwtIntervalSample >& );
    void setSamples( QwtSeriesData< QwtIntervalSample >* );

    void setPen( const QColor&,
        qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );

    void setPen( const QPen& );
    const QPen& pen() const;

    void setBrush( const QBrush& );
    const QBrush& brush() const;

    void setStyle( CurveStyle style );
    CurveStyle style() const;

    void setSymbol( const QwtIntervalSymbol* );
    const QwtIntervalSymbol* symbol() const;

    virtual void drawSeries( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect, int from, int to ) const QWT_OVERRIDE;

    virtual QRectF boundingRect() const QWT_OVERRIDE;

    virtual QwtGraphic legendIcon(
        int index, const QSizeF& ) const QWT_OVERRIDE;

  protected:

    void init();

    virtual void drawTube( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect, int from, int to ) const;

    virtual void drawSymbols( QPainter*, const QwtIntervalSymbol&,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect, int from, int to ) const;

  private:
    class PrivateData;
    PrivateData* m_data;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotIntervalCurve::PaintAttributes )

#endif