qwtscaletransformation(3)

NAME

QwtScaleTransformation

Operations for linear or logarithmic (base 10) transformations.

Definition at line 19 of file qwt_scale_map.h.
Public Types: enum Type { RubberBand, Text, 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

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

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().
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().

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