| 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_ABSTRACT_BAR_CHART_H
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| 11 | #define QWT_PLOT_ABSTRACT_BAR_CHART_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_series_data.h"
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| 16 |
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| 17 | /*!
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| 18 | \brief Abstract base class for bar chart items
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| 19 |
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| 20 | In opposite to almost all other plot items bar charts can't be
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| 21 | displayed inside of their bounding rectangle and need a special
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| 22 | API how to calculate the width of the bars and how they affect
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| 23 | the layout of the attached plot.
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| 24 | */
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| 25 | class QWT_EXPORT QwtPlotAbstractBarChart: public QwtPlotSeriesItem
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| 26 | {
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| 27 | public:
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| 28 | /*!
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| 29 | \brief Mode how to calculate the bar width
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| 30 |
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| 31 | setLayoutPolicy(), setLayoutHint(), barWidthHint()
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| 32 | */
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| 33 | enum LayoutPolicy
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| 34 | {
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| 35 | /*!
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| 36 | The sample width is calculated by dividing the bounding rectangle
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| 37 | by the number of samples. The layoutHint() is used as a minimum width
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| 38 | in paint device coordinates.
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| 39 |
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| 40 | \sa boundingRectangle()
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| 41 | */
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| 42 | AutoAdjustSamples,
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| 43 |
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| 44 | /*!
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| 45 | layoutHint() defines an interval in axis coordinates
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| 46 | */
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| 47 | ScaleSamplesToAxes,
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| 48 |
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| 49 | /*!
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| 50 | The bar width is calculated by multiplying layoutHint()
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| 51 | with the height or width of the canvas.
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| 52 |
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| 53 | \sa boundingRectangle()
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| 54 | */
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| 55 | ScaleSampleToCanvas,
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| 56 |
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| 57 | /*!
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| 58 | layoutHint() defines a fixed width in paint device coordinates.
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| 59 | */
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| 60 | FixedSampleSize
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| 61 | };
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| 62 |
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| 63 | explicit QwtPlotAbstractBarChart( const QwtText &title );
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| 64 | virtual ~QwtPlotAbstractBarChart();
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| 65 |
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| 66 | void setLayoutPolicy( LayoutPolicy );
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| 67 | LayoutPolicy layoutPolicy() const;
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| 68 |
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| 69 | void setLayoutHint( double );
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| 70 | double layoutHint() const;
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| 71 |
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| 72 | void setSpacing( int );
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| 73 | int spacing() const;
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| 74 |
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| 75 | void setMargin( int );
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| 76 | int margin() const;
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| 77 |
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| 78 | void setBaseline( double );
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| 79 | double baseline() const;
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| 80 |
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| 81 | virtual void getCanvasMarginHint(
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| 82 | const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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| 83 | const QRectF &canvasRect,
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| 84 | double &left, double &top, double &right, double &bottom) const;
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| 85 |
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| 86 |
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| 87 | protected:
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| 88 | double sampleWidth( const QwtScaleMap &map,
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| 89 | double canvasSize, double dataSize,
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| 90 | double value ) const;
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| 91 |
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| 92 | private:
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| 93 | class PrivateData;
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| 94 | PrivateData *d_data;
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| 95 | };
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| 96 |
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| 97 | #endif
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