Qwt User's Guide  6.1.0
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Public Member Functions | Static Public Member Functions | List of all members
QwtScaleMap Class Reference

A scale map. More...

#include <qwt_scale_map.h>

Public Member Functions

 QwtScaleMap ()
 Constructor. More...
 
 QwtScaleMap (const QwtScaleMap &)
 Copy constructor.
 
 ~QwtScaleMap ()
 
QwtScaleMapoperator= (const QwtScaleMap &)
 Assignment operator.
 
void setTransformation (QwtTransform *)
 
const QwtTransformtransformation () const
 Get the transformation.
 
void setPaintInterval (double p1, double p2)
 Specify the borders of the paint device interval. More...
 
void setScaleInterval (double s1, double s2)
 Specify the borders of the scale interval. More...
 
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 &)
 
static QPointF transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
 
static QPointF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
 

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
Returns
Transformed value
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
scales might be aligned to transformation depending boundaries
void QwtScaleMap::setTransformation ( QwtTransform transform)

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
Returns
Transformed value
See Also
invTransform()
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()