QwtScaleMap Class Reference

A scale map. More...

#include <qwt_scale_map.h>

List of all members.

Public Member Functions

 QwtScaleMap ()
 QwtScaleMap (const QwtScaleMap &)
 ~QwtScaleMap ()
QwtScaleMapoperator= (const QwtScaleMap &)
void setTransformation (QwtScaleTransformation *)
const QwtScaleTransformationtransformation () 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 &)

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

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()
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()
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 ( 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

QRectF QwtScaleMap::transform ( const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  rect 
) [static]

Transform a rectangle

Parameters:
xMap X map
yMap Y map
rect Rectangle in scale coordinates
Returns:
Rectangle in paint coordinates
See also:
invTransform()
double 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

Parameters:
s Value relative to the coordinates of the scale
const QwtScaleTransformation * QwtScaleMap::transformation (  )  const

Get the transformation.

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