143 lines
3.8 KiB
C
143 lines
3.8 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_RESCALER_H
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#define QWT_PLOT_RESCALER_H 1
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#include "qwt_global.h"
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#include "qwt_interval.h"
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#include "qwt_plot.h"
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#include <qobject.h>
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class QwtPlot;
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class QResizeEvent;
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/*!
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\brief QwtPlotRescaler takes care of fixed aspect ratios for plot scales
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QwtPlotRescaler auto adjusts the axes of a QwtPlot according
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to fixed aspect ratios.
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*/
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class QWT_EXPORT QwtPlotRescaler: public QObject
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{
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public:
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/*!
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The rescale policy defines how to rescale the reference axis and
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their depending axes.
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\sa ExpandingDirection, setIntervalHint()
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*/
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enum RescalePolicy
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{
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/*!
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The interval of the reference axis remains unchanged, when the
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geometry of the canvas changes. All other axes
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will be adjusted according to their aspect ratio.
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*/
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Fixed,
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/*!
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The interval of the reference axis will be shrunk/expanded,
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when the geometry of the canvas changes. All other axes
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will be adjusted according to their aspect ratio.
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The interval, that is represented by one pixel is fixed.
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*/
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Expanding,
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/*!
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The intervals of the axes are calculated, so that all axes include
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their interval hint.
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*/
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Fitting
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};
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/*!
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When rescalePolicy() is set to Expanding its direction depends
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on ExpandingDirection
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*/
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enum ExpandingDirection
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{
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//! The upper limit of the scale is adjusted
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ExpandUp,
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//! The lower limit of the scale is adjusted
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ExpandDown,
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//! Both limits of the scale are adjusted
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ExpandBoth
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};
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explicit QwtPlotRescaler( QWidget *canvas,
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int referenceAxis = QwtPlot::xBottom,
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RescalePolicy = Expanding );
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virtual ~QwtPlotRescaler();
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void setEnabled( bool );
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bool isEnabled() const;
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void setRescalePolicy( RescalePolicy );
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RescalePolicy rescalePolicy() const;
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void setExpandingDirection( ExpandingDirection );
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void setExpandingDirection( int axis, ExpandingDirection );
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ExpandingDirection expandingDirection( int axis ) const;
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void setReferenceAxis( int axis );
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int referenceAxis() const;
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void setAspectRatio( double ratio );
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void setAspectRatio( int axis, double ratio );
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double aspectRatio( int axis ) const;
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void setIntervalHint( int axis, const QwtInterval& );
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QwtInterval intervalHint( int axis ) const;
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QWidget *canvas();
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const QWidget *canvas() const;
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QwtPlot *plot();
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const QwtPlot *plot() const;
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virtual bool eventFilter( QObject *, QEvent * );
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void rescale() const;
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protected:
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virtual void canvasResizeEvent( QResizeEvent * );
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virtual void rescale( const QSize &oldSize, const QSize &newSize ) const;
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virtual QwtInterval expandScale(
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int axis, const QSize &oldSize, const QSize &newSize ) const;
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virtual QwtInterval syncScale(
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int axis, const QwtInterval& reference,
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const QSize &size ) const;
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virtual void updateScales(
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QwtInterval intervals[QwtPlot::axisCnt] ) const;
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Qt::Orientation orientation( int axis ) const;
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QwtInterval interval( int axis ) const;
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QwtInterval expandInterval( const QwtInterval &,
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double width, ExpandingDirection ) const;
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private:
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double pixelDist( int axis, const QSize & ) const;
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class AxisData;
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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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