Qwt User's Guide  6.0.2
Public Member Functions | Static Public Member Functions | Public Attributes
QwtScaleMap Class Reference

#include <qwt_scale_map.h>

List of all members.

Public Member Functions

 QwtScaleMap ()
 QwtScaleMap (const QwtScaleMap &)
 ~QwtScaleMap ()
double invTransform (double p) const
bool isInverting () const
QwtScaleMapoperator= (const QwtScaleMap &)
double p1 () const
double p2 () const
double pDist () const
double s1 () const
double s2 () const
double sDist () const
void setPaintInterval (double p1, double p2)
void setScaleInterval (double s1, double s2)
void setTransformation (QwtScaleTransformation *)
double transform (double s) const
const QwtScaleTransformationtransformation () const

Static Public Member Functions

static QRectF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QPointF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
static QRectF transform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QPointF transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)

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 the coordinate system of a scale into the linear coordinate system of a paint device 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 ( 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()
QRectF QwtScaleMap::invTransform ( const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  rect 
)
static

Transform a rectangle from paint to scale coordinates

Parameters:
xMapX map
yMapY map
rectRectangle in paint coordinates
Returns:
Rectangle in scale coordinates
See also:
transform()
QPointF QwtScaleMap::invTransform ( const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QPointF &  pos 
)
static

Transform a rectangle from paint to scale coordinates

Parameters:
xMapX map
yMapY map
posPosition in paint coordinates
Returns:
Position in scale coordinates
See also:
transform()
bool QwtScaleMap::isInverting ( ) const
inline
Returns:
True, when ( p1() < p2() ) != ( s1() < s2() )
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:
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

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:
sValue relative to the coordinates of the scale
QRectF QwtScaleMap::transform ( const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  rect 
)
static

Transform a rectangle from scale to paint coordinates

Parameters:
xMapX map
yMapY map
rectRectangle in scale coordinates
Returns:
Rectangle in paint coordinates
See also:
invTransform()
QPointF QwtScaleMap::transform ( const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QPointF &  pos 
)
static

Transform a point from scale to paint coordinates

Parameters:
xMapX map
yMapY map
posPosition in scale coordinates
Returns:
Position in paint coordinates
See also:
invTransform()