qwt_plot_rescaler.h
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_PLOT_RESCALER_H
#define QWT_PLOT_RESCALER_H 1
#include "qwt_global.h"
#include "qwt_interval.h"
#include "qwt_plot.h"
#include <qobject.h>
class QwtPlot;
class QResizeEvent;
class QWT_EXPORT QwtPlotRescaler: public QObject
{
public:
enum RescalePolicy
{
Fixed,
Expanding,
Fitting
};
enum ExpandingDirection
{
ExpandUp,
ExpandDown,
ExpandBoth
};
explicit QwtPlotRescaler( QWidget *canvas,
int referenceAxis = QwtPlot::xBottom,
RescalePolicy = Expanding );
virtual ~QwtPlotRescaler();
void setEnabled( bool );
bool isEnabled() const;
void setRescalePolicy( RescalePolicy );
RescalePolicy rescalePolicy() const;
void setExpandingDirection( ExpandingDirection );
void setExpandingDirection( int axis, ExpandingDirection );
ExpandingDirection expandingDirection( int axis ) const;
void setReferenceAxis( int axis );
int referenceAxis() const;
void setAspectRatio( double ratio );
void setAspectRatio( int axis, double ratio );
double aspectRatio( int axis ) const;
void setIntervalHint( int axis, const QwtInterval& );
QwtInterval intervalHint( int axis ) const;
QWidget *canvas();
const QWidget *canvas() const;
QwtPlot *plot();
const QwtPlot *plot() const;
virtual bool eventFilter( QObject *, QEvent * );
void rescale() const;
protected:
virtual void canvasResizeEvent( QResizeEvent * );
virtual void rescale( const QSize &oldSize, const QSize &newSize ) const;
virtual QwtInterval expandScale(
int axis, const QSize &oldSize, const QSize &newSize ) const;
virtual QwtInterval syncScale(
int axis, const QwtInterval& reference,
const QSize &size ) const;
virtual void updateScales(
QwtInterval intervals[QwtPlot::axisCnt] ) const;
Qt::Orientation orientation( int axis ) const;
QwtInterval interval( int axis ) const;
QwtInterval expandInterval( const QwtInterval &,
double width, ExpandingDirection ) const;
private:
double pixelDist( int axis, const QSize & ) const;
class AxisData;
class PrivateData;
PrivateData *d_data;
};
#endif
QwtPlotRescaler::ExpandUp
The upper limit of the scale is adjusted.
Definition: qwt_plot_rescaler.h:70
QwtPlot::axisCnt
Number of axes.
Definition: qwt_plot.h:109
QwtPlotRescaler::Expanding
Definition: qwt_plot_rescaler.h:54
QwtPlotRescaler::Fixed
Definition: qwt_plot_rescaler.h:44
QwtPlot::xBottom
X axis below the canvas.
Definition: qwt_plot.h:103
QwtPlotRescaler::RescalePolicy
RescalePolicy
Definition: qwt_plot_rescaler.h:37
QwtPlotRescaler::ExpandingDirection
ExpandingDirection
Definition: qwt_plot_rescaler.h:67
QwtPlotRescaler
QwtPlotRescaler takes care of fixed aspect ratios for plot scales.
Definition: qwt_plot_rescaler.h:28
QwtPlotRescaler::ExpandDown
The lower limit of the scale is adjusted.
Definition: qwt_plot_rescaler.h:73
QwtInterval
A class representing an interval.
Definition: qwt_interval.h:26
QwtPlot
A 2-D plotting widget.
Definition: qwt_plot.h:75