QwtScaleTransformation Class Reference

List of all members.

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Detailed Description

Operations for linear or logarithmic (base 10) transformations.

Definition at line 19 of file qwt_scale_map.h.

Public Types
enum	Type {   Linear,   Log10,   Other }
Public Member Functions
	QwtScaleTransformation (Type type)
virtual	~QwtScaleTransformation ()
virtual double	xForm (double x, double s1, double s2, double p1, double p2) const
virtual double	invXForm (double x, double s1, double s2, double p1, double p2) const
Type	type () const
virtual QwtScaleTransformation *	copy () const

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Constructor & Destructor Documentation

QwtScaleTransformation::QwtScaleTransformation (  Type  type  )

Constructor for a linear transformation. Definition at line 16 of file qwt_scale_map.cpp. References QwtScaleTransformation(). Referenced by QwtScaleTransformation().

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Member Function Documentation

double QwtScaleTransformation::invXForm (  double  p, double  p1, double  p2, double  s1, double  s2 )  const [virtual]

Transform a value from a linear to a logarithmic interval. Parameters: x  value related to the linear interval [p1, p2] p1  first border of linear interval p2  first border of linear interval s1  first border of logarithmic interval s2  first border of logarithmic interval Returns: exp((x - p1) / (p2 - p1) * log(s2 / s1)) * s1; Definition at line 70 of file qwt_scale_map.cpp. Referenced by QwtScaleMap::invTransform().

double QwtScaleTransformation::xForm (  double  s, double  s1, double  s2, double  p1, double  p2 )  const [virtual]

Transform a value between 2 linear intervals. Parameters: x  value related to the interval [x1, x2] x1  first border of source interval x2  first border of source interval y1  first border of target interval y2  first border of target interval Returns: linear mapping: y1 + (y2 - y1) / (x2 - x1) * (x - x1) log10 mapping: p1 + (p2 - p1) / log(s2 / s1) * log(x / s1) Definition at line 47 of file qwt_scale_map.cpp. Referenced by QwtScaleMap::xTransform().

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