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

NAME

QwtScaleTransformation -
Operations for linear or logarithmic (base 10) transformations.
 

SYNOPSIS

#include <qwt_scale_map.h>

Public Types


enum Type { Linear, Log10, Other }
 

Public Member Functions


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

Detailed Description

Operations for linear or logarithmic (base 10) transformations.

Constructor & Destructor Documentation

QwtScaleTransformation::QwtScaleTransformation (Typetype)

Constructor for a linear transformation.

QwtScaleTransformation::~QwtScaleTransformation () [virtual]

Destructor.

Member Function Documentation

QwtScaleTransformation * QwtScaleTransformation::copy () const [virtual]

Create a clone of the transformation.

double QwtScaleTransformation::invXForm (doublep, doublep1, doublep2, doubles1, doubles2) const [virtual]

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;
 

QwtScaleTransformation::Type QwtScaleTransformation::type () const [inline] Returns:

Transformation type
 

double QwtScaleTransformation::xForm (doubles, doubles1, doubles2, doublep1, doublep2) const [virtual]

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);
 
 

Author

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Mon Aug 1 2011 Version 5.2.2