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Man Pages
QwtScaleTransformation(3) Qwt User's Guide QwtScaleTransformation(3)

QwtScaleTransformation -

#include <qwt_scale_map.h>


enum Type { Linear, Log10, Other }
 


QwtScaleTransformation (Type type)
 
virtual ~QwtScaleTransformation ()
 
virtual QwtScaleTransformation * copy () const
 
virtual double invXForm (double x, double p1, double p2, double s1, double s2) const
 
Type type () const
 
virtual double xForm (double x, double s1, double s2, double p1, double p2) const
 

Operations for linear or logarithmic (base 10) transformations.

Transform a value from the coordinate system of the paint device into the coordinate system of a scale. Parameters:
p Value related to the coordinate system of the paint device
 
p1 First border of the coordinate system of the paint device
 
p2 Second border of the coordinate system of the paint device
 
s1 First border of the coordinate system of the scale
 
s2 Second border of the coordinate system of the scale
Returns:
linear mapping:
s1 + ( s2 - s1 ) / ( p2 - p1 ) * ( p - p1 );
log10 mapping:
exp((p - p1) / (p2 - p1) * log(s2 / s1)) * s1;

Returns:
Transformation type

Transform a value from the coordinate system of a scale into the coordinate system of the paint device. Parameters:
s Value related to the coordinate system of the scale
 
s1 First border of the coordinate system of the scale
 
s2 Second border of the coordinate system of the scale
 
p1 First border of the coordinate system of the paint device
 
p2 Second border of the coordinate system of the paint device
Returns:
linear mapping:
p1 + (p2 - p1) / (s2 - s1) * (s - s1);
log10 mapping:
p1 + (p2 - p1) / log(s2 / s1) * log(s / s1);

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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