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QwtScaleMap(3) Qwt User's Guide QwtScaleMap(3)

NAME

QwtScaleMap -
A scale map.
 

SYNOPSIS

#include <qwt_scale_map.h>

Public Member Functions


QwtScaleMap ()
 
QwtScaleMap (const QwtScaleMap &)
 
~QwtScaleMap ()
 
QwtScaleMap & operator= (const QwtScaleMap &)
 
void setTransformation (QwtScaleTransformation *)
 
const QwtScaleTransformation * transformation () const
 
void setPaintInterval (double p1, double p2)
 
void setScaleInterval (double s1, double s2)
 
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 &)
 

Public Attributes


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

Detailed Description

A scale map.
 
QwtScaleMap offers transformations from a scale into a paint interval 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 (doublep) 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()
 

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()
 

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()
 

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 (doublep1, doublep2)

Specify the borders of the paint device interval. Parameters:
p1 first border
 
p2 second border
 

void QwtScaleMap::setScaleInterval (doubles1, doubles2)

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

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()
 

double QwtScaleMap::transform (doubles) 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()
 

const QwtScaleTransformation * QwtScaleMap::transformation () const

Get the transformation.

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.
 

Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.
Fri Apr 15 2011 Version 6.0.0