DOKK / manpages / debian 10 / libqwt5-doc / QwtScaleMap.3.en
QwtScaleMap(3) Qwt User's Guide QwtScaleMap(3)

QwtScaleMap -

#include <qwt_scale_map.h>


QwtScaleMap ()
QwtScaleMap (const QwtScaleMap &)
~QwtScaleMap ()
double invTransform (double i) const
QwtScaleMap & operator= (const QwtScaleMap &)
double p1 () const
double p2 () const
double pDist () const
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 QwtScaleTransformation * transformation () const
double xTransform (double x) const


QT_STATIC_CONST double LogMax = 1.0e150
QT_STATIC_CONST double LogMin = 1.0e-150

A scale map.

QwtScaleMap offers transformations from a scale into a paint interval and vice versa.

Constructor. The scale and paint device intervals are both set to [0,1].

Destructor

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()

Returns:

First border of the paint interval

Returns:

Second border of the paint interval

Returns:

qwtAbs(p2() - p1())

Returns:

First border of the scale interval

Returns:

Second border of the scale interval

Returns:

qwtAbs(s2() - s1())

Specify the borders of the paint device interval. Parameters:

p1 first border
p2 second border

Specify the borders of the paint device interval. Parameters:

p1 first border
p2 second border

Specify the borders of the scale interval. Parameters:

s1 first border
s2 second border

Warning:

logarithmic scales might be aligned to [LogMin, LogMax]

Initialize the map with a transformation

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()

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

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Tue Nov 20 2012 Version 5.2.3