conflicting packages
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
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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