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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


double invTransform (double i) const
 
QwtScaleMap & operator= (const QwtScaleMap &)
 
double p1 () const
 
double p2 () const
 
double pDist () const
 
QwtScaleMap (const QwtScaleMap &)
 
QwtScaleMap ()
 
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
 
~QwtScaleMap ()
 

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 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()
 

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 (intp1, intp2)

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

void QwtScaleMap::setPaintXInterval (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

int QwtScaleMap::transform (doubles) 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()
 

const QwtScaleTransformation * QwtScaleMap::transformation () const

Get the transformation.

double QwtScaleMap::xTransform (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
 
 

Author

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Mon Aug 1 2011 Version 5.2.2