QwtScaleMap Class Reference

#include <qwt_scale_map.h>

List of all members.

Public Member Functions
	QwtScaleMap ()
	QwtScaleMap (const QwtScaleMap &)
	~QwtScaleMap ()
double	invTransform (double i) const
QwtScaleMap &	operator= (const QwtScaleMap &)
double	p1 () const
double	p2 () const
double	pDist () const
double	s1 () const
double	s2 () const
double	sDist () const
void	setPaintInterval (int p1, int p2)
void	setPaintXInterval (double p1, double p2)
void	setScaleInterval (double s1, double s2)
void	setTransformation (QwtScaleTransformation *)
int	transform (double x) const
const QwtScaleTransformation *	transformation () const
double	xTransform (double x) const

Public Attributes
QT_STATIC_CONST double	LogMax = 1.0e150
QT_STATIC_CONST double	LogMin = 1.0e-150

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Detailed Description

A scale map.

QwtScaleMap offers transformations from a scale into a paint interval and vice versa.

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Constructor & Destructor Documentation

QwtScaleMap::QwtScaleMap

(

)

Constructor.

The scale and paint device intervals are both set to [0,1].

QwtScaleMap::~QwtScaleMap

(

)

Destructor

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Member Function Documentation

double QwtScaleMap::invTransform ( double  p ) const

inline

Transform an paint device value into a value in the interval of the scale.

Parameters:

p	Value relative to the coordinates of the paint device

See also:

transform()

double QwtScaleMap::p1 ( ) const

inline

Returns:

First border of the paint interval

double QwtScaleMap::p2 ( ) const

inline

Returns:

Second border of the paint interval

double QwtScaleMap::pDist ( ) const

inline

Returns:

qwtAbs(p2() - p1())

double QwtScaleMap::s1 ( ) const

inline

Returns:

First border of the scale interval

double QwtScaleMap::s2 ( ) const

inline

Returns:

Second border of the scale interval

double QwtScaleMap::sDist ( ) const

inline

Returns:

qwtAbs(s2() - s1())

void QwtScaleMap::setPaintInterval	(	int	p1,
		int	p2
	)

Specify the borders of the paint device interval.

Parameters:

p1	first border
p2	second border

void QwtScaleMap::setPaintXInterval	(	double	p1,
		double	p2
	)

Specify the borders of the paint device interval.

Parameters:

p1	first border
p2	second border

void QwtScaleMap::setScaleInterval	(	double	s1,
		double	s2
	)

Specify the borders of the scale interval.

Parameters:

s1	first border
s2	second border

Warning:

logarithmic scales might be aligned to [LogMin, LogMax]

void QwtScaleMap::setTransformation

(

QwtScaleTransformation *

transformation

)

Initialize the map with a transformation

int QwtScaleMap::transform ( double  s ) const

inline

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. )

Parameters:

s	Value relative to the coordinates of the scale

See also:

xTransform()

double QwtScaleMap::xTransform ( double  s ) const

inline

Transform a point related to the scale interval into an point related to the interval of the paint device

Parameters:

s	Value relative to the coordinates of the scale