QwtScaleMap Class Reference

#include <qwt_scale_map.h>

List of all members.

Public Member Functions
double	invTransform (double p) const
bool	isInverting () const
QwtScaleMap &	operator= (const QwtScaleMap &)
double	p1 () const
double	p2 () const
double	pDist () const
	QwtScaleMap ()
	QwtScaleMap (const QwtScaleMap &)
double	s1 () const
double	s2 () const
double	sDist () const
void	setPaintInterval (double p1, double p2)
void	setScaleInterval (double s1, double s2)
void	setTransformation (QwtScaleTransformation *)
double	transform (double s) const
const QwtScaleTransformation *	transformation () const
	~QwtScaleMap ()
Static Public Member Functions
static QRectF	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QPointF	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
static QRectF	transform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QPointF	transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
Public Attributes
QT_STATIC_CONST double	LogMax = 1.0e150
QT_STATIC_CONST double	LogMin = 1.0e-150

---

Detailed Description

A scale map.

QwtScaleMap offers transformations from the coordinate system of a scale into the linear coordinate system of a paint device and vice versa.

---

Constructor & Destructor Documentation

QwtScaleMap::QwtScaleMap

(

)

Constructor.

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

QwtScaleMap::QwtScaleMap

(

const QwtScaleMap &

other

)

Copy constructor.

QwtScaleMap::~QwtScaleMap

(

)

Destructor

---

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()

QRectF QwtScaleMap::invTransform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	rect
	)		[static]

Transform a rectangle from paint to scale coordinates

Parameters:

xMap	X map
yMap	Y map
rect	Rectangle in paint coordinates

Returns:

Rectangle in scale coordinates

See also:

transform()

QPointF QwtScaleMap::invTransform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QPointF &	pos
	)		[static]

Transform a rectangle from paint to scale coordinates

Parameters:

xMap	X map
yMap	Y map
pos	Position in paint coordinates

Returns:

Position in scale coordinates

See also:

transform()

bool QwtScaleMap::isInverting

(

)

const [inline]

Returns:

True, when ( p1() < p2() ) != ( s1() < s2() )

QwtScaleMap & QwtScaleMap::operator=

(

const QwtScaleMap &

other

)

Assignment operator.

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	(	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

double 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

Parameters:

s	Value relative to the coordinates of the scale

QRectF QwtScaleMap::transform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	rect
	)		[static]

Transform a rectangle from scale to paint coordinates

Parameters:

xMap	X map
yMap	Y map
rect	Rectangle in scale coordinates

Returns:

Rectangle in paint coordinates

See also:

invTransform()

QPointF QwtScaleMap::transform	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QPointF &	pos
	)		[static]

Transform a point from scale to paint coordinates

Parameters:

xMap	X map
yMap	Y map
pos	Position in scale coordinates

Returns:

Position in paint coordinates

See also:

invTransform()

const QwtScaleTransformation * QwtScaleMap::transformation

(

)

const

Get the transformation.

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Member Data Documentation

QT_STATIC_CONST_IMPL double QwtScaleMap::LogMax = 1.0e150

Largest allowed value for logarithmic scales: 1.0e150.

QT_STATIC_CONST_IMPL double QwtScaleMap::LogMin = 1.0e-150

Smallest allowed value for logarithmic scales: 1.0e-150.