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 (int p1, int p2)
void setPaintXInterval (double p1, double p2)
void setScaleInterval (double s1, double s2)
int transform (double x) const
double invTransform (double i) const
double xTransform (double x) const
double p1 () const
double p2 () const
double s1 () const
double s2 () const
double pDist () const
double sDist () const

  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 (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()

  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 (int p1, int p2)

Specify the borders of the paint device interval.

Parameters:
    p1 first border
    p2 second border

  void QwtScaleMap::setPaintXInterval (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

  int 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 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 (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

Author

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