/usr/include/qwt-qt4/qwt_scale_map.h is in libqwt5-qt4-dev 5.2.2-1ubuntu2.
This file is owned by root:root, with mode 0o644.
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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_SCALE_MAP_H
#define QWT_SCALE_MAP_H
#include "qwt_global.h"
#include "qwt_math.h"
/*!
\brief Operations for linear or logarithmic (base 10) transformations
*/
class QWT_EXPORT QwtScaleTransformation
{
public:
enum Type
{
Linear,
Log10,
Other
};
QwtScaleTransformation(Type type);
virtual ~QwtScaleTransformation();
virtual double xForm(double x, double s1, double s2,
double p1, double p2) const;
virtual double invXForm(double x, double p1, double p2,
double s1, double s2) const;
Type type() const;
virtual QwtScaleTransformation *copy() const;
private:
QwtScaleTransformation();
QwtScaleTransformation &operator=( const QwtScaleTransformation);
const Type d_type;
};
//! \return Transformation type
inline QwtScaleTransformation::Type QwtScaleTransformation::type() const
{
return d_type;
}
/*!
\brief A scale map
QwtScaleMap offers transformations from a scale
into a paint interval and vice versa.
*/
class QWT_EXPORT QwtScaleMap
{
public:
QwtScaleMap();
QwtScaleMap(const QwtScaleMap&);
~QwtScaleMap();
QwtScaleMap &operator=(const QwtScaleMap &);
void setTransformation(QwtScaleTransformation * );
const QwtScaleTransformation *transformation() const;
void setPaintInterval(int p1, int p2);
void setPaintXInterval(double p1, double p2);
void setScaleInterval(double s1, double s2);
int transform(double x) const;
double invTransform(double i) const;
double xTransform(double x) const;
double p1() const;
double p2() const;
double s1() const;
double s2() const;
double pDist() const;
double sDist() const;
QT_STATIC_CONST double LogMin;
QT_STATIC_CONST double LogMax;
private:
void newFactor();
double d_s1, d_s2; // scale interval boundaries
double d_p1, d_p2; // paint device interval boundaries
double d_cnv; // conversion factor
QwtScaleTransformation *d_transformation;
};
/*!
\return First border of the scale interval
*/
inline double QwtScaleMap::s1() const
{
return d_s1;
}
/*!
\return Second border of the scale interval
*/
inline double QwtScaleMap::s2() const
{
return d_s2;
}
/*!
\return First border of the paint interval
*/
inline double QwtScaleMap::p1() const
{
return d_p1;
}
/*!
\return Second border of the paint interval
*/
inline double QwtScaleMap::p2() const
{
return d_p2;
}
/*!
\return qwtAbs(p2() - p1())
*/
inline double QwtScaleMap::pDist() const
{
return qwtAbs(d_p2 - d_p1);
}
/*!
\return qwtAbs(s2() - s1())
*/
inline double QwtScaleMap::sDist() const
{
return qwtAbs(d_s2 - d_s1);
}
/*!
Transform a point related to the scale interval into an point
related to the interval of the paint device
\param s Value relative to the coordinates of the scale
*/
inline double QwtScaleMap::xTransform(double s) const
{
// try to inline code from QwtScaleTransformation
if ( d_transformation->type() == QwtScaleTransformation::Linear )
return d_p1 + (s - d_s1) * d_cnv;
if ( d_transformation->type() == QwtScaleTransformation::Log10 )
return d_p1 + log(s / d_s1) * d_cnv;
return d_transformation->xForm(s, d_s1, d_s2, d_p1, d_p2 );
}
/*!
Transform an paint device value into a value in the
interval of the scale.
\param p Value relative to the coordinates of the paint device
\sa transform()
*/
inline double QwtScaleMap::invTransform(double p) const
{
return d_transformation->invXForm(p, d_p1, d_p2, d_s1, d_s2 );
}
/*!
Transform a point related to the scale interval into an point
related to the interval of the paint device and round it to
an integer. (In Qt <= 3.x paint devices are integer based. )
\param s Value relative to the coordinates of the scale
\sa xTransform()
*/
inline int QwtScaleMap::transform(double s) const
{
return qRound(xTransform(s));
}
#endif
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