QwtScaleMap Class Reference

A scale map. More...

#include <qwt_scale_map.h>

Public Member Functions
	QwtScaleMap ()
	Constructor.
	QwtScaleMap (const QwtScaleMap &)
	Copy constructor.
	~QwtScaleMap ()
QwtScaleMap &	operator= (const QwtScaleMap &)
	Assignment operator.
void	setTransformation (QwtTransform *)
const QwtTransform *	transformation () const
	Get the transformation.
void	setPaintInterval (double p1, double p2)
	Specify the borders of the paint device interval.
void	setScaleInterval (double s1, double s2)
	Specify the borders of the scale interval.
double	transform (double s) const
double	invTransform (double p) const
double	p1 () const
double	p2 () const
double	s1 () const
double	s2 () const
double	pDist () const
double	sDist () const
bool	isInverting () const

Static Public Member Functions
static QRectF	transform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QRectF	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QPointF	transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
static QPointF	invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)

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.

Definition at line 26 of file qwt_scale_map.h.

Constructor & Destructor Documentation

QwtScaleMap() [1/2]

QwtScaleMap::QwtScaleMap

(

)

Constructor.

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

Definition at line 21 of file qwt_scale_map.cpp.

QwtScaleMap() [2/2]

QwtScaleMap::QwtScaleMap

(

const QwtScaleMap &

other

)

Copy constructor.

Definition at line 33 of file qwt_scale_map.cpp.

~QwtScaleMap()

QwtScaleMap::~QwtScaleMap

(

)

Destructor

Definition at line 49 of file qwt_scale_map.cpp.

Member Function Documentation

invTransform() [1/3]

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()

Definition at line 187 of file qwt_scale_map.cpp.

invTransform() [2/3]

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()

Definition at line 224 of file qwt_scale_map.cpp.

invTransform() [3/3]

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

Returns

Transformed value

See also

transform()

Definition at line 154 of file qwt_scale_map.h.

isInverting()

bool QwtScaleMap::isInverting ( ) const

inline

Returns

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

Definition at line 164 of file qwt_scale_map.h.

operator=()

QwtScaleMap & QwtScaleMap::operator=

(

const QwtScaleMap &

other

)

Assignment operator.

Definition at line 55 of file qwt_scale_map.cpp.

p1()

double QwtScaleMap::p1 ( ) const

inline

Returns

First border of the paint interval

Definition at line 99 of file qwt_scale_map.h.

p2()

double QwtScaleMap::p2 ( ) const

inline

Returns

Second border of the paint interval

Definition at line 107 of file qwt_scale_map.h.

pDist()

double QwtScaleMap::pDist ( ) const

inline

Returns

qwtAbs(p2() - p1())

Definition at line 115 of file qwt_scale_map.h.

s1()

double QwtScaleMap::s1 ( ) const

inline

Returns

First border of the scale interval

Definition at line 83 of file qwt_scale_map.h.

s2()

double QwtScaleMap::s2 ( ) const

inline

Returns

Second border of the scale interval

Definition at line 91 of file qwt_scale_map.h.

sDist()

double QwtScaleMap::sDist ( ) const

inline

Returns

qwtAbs(s2() - s1())

Definition at line 123 of file qwt_scale_map.h.

setPaintInterval()

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

Specify the borders of the paint device interval.

Parameters

p1	first border
p2	second border

Definition at line 119 of file qwt_scale_map.cpp.

setScaleInterval()

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

Specify the borders of the scale interval.

Parameters

s1	first border
s2	second border

Warning

scales might be aligned to transformation depending boundaries

Definition at line 100 of file qwt_scale_map.cpp.

setTransformation()

void QwtScaleMap::setTransformation

(

QwtTransform *

transform

)

Initialize the map with a transformation

Definition at line 76 of file qwt_scale_map.cpp.

transform() [1/3]

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()

Definition at line 206 of file qwt_scale_map.cpp.

transform() [2/3]

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()

Definition at line 153 of file qwt_scale_map.cpp.

transform() [3/3]

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

Returns

Transformed value

See also

invTransform()

Definition at line 137 of file qwt_scale_map.h.

transformation()

const QwtTransform * QwtScaleMap::transformation

(

)

const

Get the transformation.

Definition at line 88 of file qwt_scale_map.cpp.