/usr/include/qwt-qt4/qwt_plot_rescaler.h is in libqwt5-qt4-dev 5.2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* 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_double_rect.h"
#include "qwt_double_interval.h"
#include "qwt_plot.h"
#include <qobject.h>
class QwtPlotCanvas;
class QResizeEvent;
/*!
\brief QwtPlotRescaler takes care of fixed aspect ratios for plot scales
QwtPlotRescaler autoadjusts the axes of a QwtPlot according
to fixed aspect ratios.
*/
class QWT_EXPORT QwtPlotRescaler: public QObject
{
public:
/*!
\brief Rescale Policy
The rescale policy defines how to rescale the reference axis and
their depending axes.
- Fixed
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.
- Expanding
The interval of the reference axis will be shrinked/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.
- Fitting
The intervals of the axes are calculated, so that all axes include
their minimal interval.
*/
enum RescalePolicy
{
Fixed,
Expanding,
Fitting
};
enum ExpandingDirection
{
ExpandUp,
ExpandDown,
ExpandBoth
};
explicit QwtPlotRescaler(QwtPlotCanvas *,
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 QwtDoubleInterval&);
QwtDoubleInterval intervalHint(int axis) const;
QwtPlotCanvas *canvas();
const QwtPlotCanvas *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 QwtDoubleInterval expandScale( int axis,
const QSize &oldSize, const QSize &newSize) const;
virtual QwtDoubleInterval syncScale(
int axis, const QwtDoubleInterval& reference,
const QSize &size) const;
virtual void updateScales(
QwtDoubleInterval intervals[QwtPlot::axisCnt]) const;
Qt::Orientation orientation(int axis) const;
QwtDoubleInterval interval(int axis) const;
QwtDoubleInterval expandInterval(const QwtDoubleInterval &,
double width, ExpandingDirection) const;
private:
double pixelDist(int axis, const QSize &) const;
class AxisData;
class PrivateData;
PrivateData *d_data;
};
#endif
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