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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

Generated automatically by Doxygen for Qwt User's Guide from the source code.
Tue Nov 20 2012 Version 5.2.3

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