Qwt User's Guide 5.2.2
Public Member Functions | Public Attributes

QwtScaleMap Class Reference

A scale map. More...

#include <qwt_scale_map.h>

List of all members.

Public Member Functions

double invTransform (double i) const
QwtScaleMapoperator= (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 QwtScaleTransformationtransformation () 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 ( double  p) const [inline]

Transform an paint device value into a value in the interval of the scale.

Parameters:
pValue 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:
p1first border
p2second border
void QwtScaleMap::setPaintXInterval ( double  p1,
double  p2 
)

Specify the borders of the paint device interval.

Parameters:
p1first border
p2second border
void QwtScaleMap::setScaleInterval ( double  s1,
double  s2 
)

Specify the borders of the scale interval.

Parameters:
s1first border
s2second 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:
sValue 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:
sValue relative to the coordinates of the scale