| 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef QWT_PLOT_HISTOGRAM_H
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| 11 | #define QWT_PLOT_HISTOGRAM_H
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 | #include "qwt_plot_seriesitem.h"
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| 15 | #include "qwt_column_symbol.h"
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| 16 | #include <qcolor.h>
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| 17 | #include <qvector.h>
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| 18 |
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| 19 | class QwtIntervalData;
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| 20 | class QString;
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| 21 | class QPolygonF;
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| 22 |
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| 23 | /*!
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| 24 | \brief QwtPlotHistogram represents a series of samples, where an interval
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| 25 | is associated with a value ( \f$y = f([x1,x2])\f$ ).
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| 26 |
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| 27 | The representation depends on the style() and an optional symbol()
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| 28 | that is displayed for each interval.
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| 29 |
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| 30 | \note The term "histogram" is used in a different way in the areas of
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| 31 | digital image processing and statistics. Wikipedia introduces the
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| 32 | terms "image histogram" and "color histogram" to avoid confusions.
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| 33 | While "image histograms" can be displayed by a QwtPlotCurve there
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| 34 | is no applicable plot item for a "color histogram" yet.
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| 35 | */
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| 36 |
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| 37 | class QWT_EXPORT QwtPlotHistogram: public QwtPlotSeriesItem<QwtIntervalSample>
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| 38 | {
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| 39 | public:
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| 40 | /*!
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| 41 | Histogram styles.
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| 42 | The default style is QwtPlotHistogram::Columns.
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| 43 |
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| 44 | \sa setStyle(), style(), setSymbol(), symbol(), setBaseline()
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| 45 | */
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| 46 | enum HistogramStyle
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| 47 | {
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| 48 | /*!
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| 49 | Draw an outline around the area, that is build by all intervals
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| 50 | using the pen() and fill it with the brush(). The outline style
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| 51 | requires, that the intervals are in increasing order and
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| 52 | not overlapping.
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| 53 | */
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| 54 | Outline,
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| 55 |
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| 56 | /*!
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| 57 | Draw a column for each interval. When a symbol() has been set
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| 58 | the symbol is used otherwise the column is displayed as
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| 59 | plain rectangle using pen() and brush().
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| 60 | */
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| 61 | Columns,
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| 62 |
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| 63 | /*!
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| 64 | Draw a simple line using the pen() for each interval.
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| 65 | */
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| 66 | Lines,
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| 67 |
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| 68 | /*!
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| 69 | Styles >= UserStyle are reserved for derived
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| 70 | classes that overload drawSeries() with
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| 71 | additional application specific ways to display a histogram.
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| 72 | */
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| 73 | UserStyle = 100
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| 74 | };
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| 75 |
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| 76 | explicit QwtPlotHistogram( const QString &title = QString::null );
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| 77 | explicit QwtPlotHistogram( const QwtText &title );
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| 78 | virtual ~QwtPlotHistogram();
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| 79 |
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| 80 | virtual int rtti() const;
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| 81 |
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| 82 | void setPen( const QPen & );
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| 83 | const QPen &pen() const;
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| 84 |
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| 85 | void setBrush( const QBrush & );
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| 86 | const QBrush &brush() const;
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| 87 |
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| 88 | void setSamples( const QVector<QwtIntervalSample> & );
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| 89 |
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| 90 | void setBaseline( double reference );
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| 91 | double baseline() const;
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| 92 |
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| 93 | void setStyle( HistogramStyle style );
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| 94 | HistogramStyle style() const;
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| 95 |
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| 96 | void setSymbol( const QwtColumnSymbol * );
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| 97 | const QwtColumnSymbol *symbol() const;
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| 98 |
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| 99 | virtual void drawSeries( QPainter *p,
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| 100 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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| 101 | const QRectF &canvasRect, int from, int to ) const;
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| 102 |
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| 103 | virtual QRectF boundingRect() const;
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| 104 |
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| 105 | virtual void drawLegendIdentifier( QPainter *, const QRectF & ) const;
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| 106 |
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| 107 | protected:
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| 108 | virtual QwtColumnRect columnRect( const QwtIntervalSample &,
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| 109 | const QwtScaleMap &, const QwtScaleMap & ) const;
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| 110 |
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| 111 | virtual void drawColumn( QPainter *, const QwtColumnRect &,
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| 112 | const QwtIntervalSample & ) const;
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| 113 |
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| 114 | void drawColumns( QPainter *,
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| 115 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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| 116 | int from, int to ) const;
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| 117 |
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| 118 | void drawOutline( QPainter *,
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| 119 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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| 120 | int from, int to ) const;
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| 121 |
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| 122 | void drawLines( QPainter *,
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| 123 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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| 124 | int from, int to ) const;
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| 125 |
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| 126 | private:
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| 127 | void init();
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| 128 | void flushPolygon( QPainter *, double baseLine, QPolygonF & ) const;
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| 129 |
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| 130 | class PrivateData;
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| 131 | PrivateData *d_data;
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| 132 | };
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| 133 |
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| 134 | #endif
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