qt_demoe/third/3rd_qwt/qwt_plot_rescaler.h

143 lines
3.8 KiB
C++

/* -*- 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;
/*!
\brief QwtPlotRescaler takes care of fixed aspect ratios for plot scales
QwtPlotRescaler auto adjusts the axes of a QwtPlot according
to fixed aspect ratios.
*/
class QWT_EXPORT QwtPlotRescaler: public QObject
{
public:
/*!
The rescale policy defines how to rescale the reference axis and
their depending axes.
\sa ExpandingDirection, setIntervalHint()
*/
enum RescalePolicy
{
/*!
The interval of the reference axis remains unchanged, when the
geometry of the canvas changes. All other axes
will be adjusted according to their aspect ratio.
*/
Fixed,
/*!
The interval of the reference axis will be shrunk/expanded,
when the geometry of the canvas changes. All other axes
will be adjusted according to their aspect ratio.
The interval, that is represented by one pixel is fixed.
*/
Expanding,
/*!
The intervals of the axes are calculated, so that all axes include
their interval hint.
*/
Fitting
};
/*!
When rescalePolicy() is set to Expanding its direction depends
on ExpandingDirection
*/
enum ExpandingDirection
{
//! The upper limit of the scale is adjusted
ExpandUp,
//! The lower limit of the scale is adjusted
ExpandDown,
//! Both limits of the scale are adjusted
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