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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