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

NAME

QwtScaleMap -

SYNOPSIS

#include <qwt_scale_map.h>

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

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 ()

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()

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()

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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Tue Nov 20 2012 Version 5.2.3