98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_PLOT_ABSTRACT_BAR_CHART_H
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#define QWT_PLOT_ABSTRACT_BAR_CHART_H
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#include "qwt_global.h"
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#include "qwt_plot_seriesitem.h"
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#include "qwt_series_data.h"
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/*!
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\brief Abstract base class for bar chart items
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In opposite to almost all other plot items bar charts can't be
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displayed inside of their bounding rectangle and need a special
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API how to calculate the width of the bars and how they affect
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the layout of the attached plot.
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*/
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class QWT_EXPORT QwtPlotAbstractBarChart: public QwtPlotSeriesItem
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{
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public:
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/*!
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\brief Mode how to calculate the bar width
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setLayoutPolicy(), setLayoutHint(), barWidthHint()
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*/
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enum LayoutPolicy
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{
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/*!
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The sample width is calculated by dividing the bounding rectangle
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by the number of samples. The layoutHint() is used as a minimum width
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in paint device coordinates.
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\sa boundingRectangle()
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*/
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AutoAdjustSamples,
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/*!
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layoutHint() defines an interval in axis coordinates
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*/
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ScaleSamplesToAxes,
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/*!
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The bar width is calculated by multiplying layoutHint()
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with the height or width of the canvas.
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\sa boundingRectangle()
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*/
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ScaleSampleToCanvas,
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/*!
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layoutHint() defines a fixed width in paint device coordinates.
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*/
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FixedSampleSize
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};
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explicit QwtPlotAbstractBarChart( const QwtText &title );
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virtual ~QwtPlotAbstractBarChart();
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void setLayoutPolicy( LayoutPolicy );
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LayoutPolicy layoutPolicy() const;
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void setLayoutHint( double );
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double layoutHint() const;
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void setSpacing( int );
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int spacing() const;
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void setMargin( int );
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int margin() const;
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void setBaseline( double );
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double baseline() const;
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virtual void getCanvasMarginHint(
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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const QRectF &canvasRect,
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double &left, double &top, double &right, double &bottom) const;
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protected:
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double sampleWidth( const QwtScaleMap &map,
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double canvasSize, double dataSize,
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double value ) const;
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private:
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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