.TH "QwtScaleTransformation" 3 "Fri Apr 15 2011" "Version 6.0.0" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtScaleTransformation \- 
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Operations for linear or logarithmic (base 10) transformations.  

.SH SYNOPSIS
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\fC#include <qwt_scale_map.h>\fP
.SS "Public Types"

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.RI "enum \fBType\fP { \fBLinear\fP, \fBLog10\fP, \fBOther\fP }"
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.SS "Public Member Functions"

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.RI "\fBQwtScaleTransformation\fP (\fBType\fP type)"
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.RI "virtual \fB~QwtScaleTransformation\fP ()"
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.RI "virtual double \fBxForm\fP (double x, double s1, double s2, double p1, double p2) const "
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.RI "virtual double \fBinvXForm\fP (double x, double s1, double s2, double p1, double p2) const "
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.RI "\fBType\fP \fBtype\fP () const "
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.RI "virtual \fBQwtScaleTransformation\fP * \fBcopy\fP () const "
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.SH "Detailed Description"
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Operations for linear or logarithmic (base 10) transformations. 
.SH "Member Enumeration Documentation"
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.SS "enum \fBQwtScaleTransformation::Type\fP"
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Transformation type. 
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\fBEnumerator: \fP
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\fB\fILinear \fP\fP
Transformation between 2 linear scales. 
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\fB\fILog10 \fP\fP
Transformation between a linear and a logarithmic ( base 10 ) scale. 
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\fB\fIOther \fP\fP
Any other type of transformation. 
.SH "Constructor & Destructor Documentation"
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.SS "QwtScaleTransformation::QwtScaleTransformation (\fBType\fPtype)"
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Constructor for a linear transformation. 
.SS "QwtScaleTransformation::~QwtScaleTransformation ()\fC [virtual]\fP"
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Destructor. 
.SH "Member Function Documentation"
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.SS "\fBQwtScaleTransformation\fP * QwtScaleTransformation::copy () const\fC [virtual]\fP"
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Create a clone of the transformation. 
.SS "double QwtScaleTransformation::invXForm (doublep, doublep1, doublep2, doubles1, doubles2) const\fC [virtual]\fP"
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Transform a value from a linear to a logarithmic interval. \fBParameters:\fP
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\fIp\fP value related to the linear interval [p1, p2] 
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\fIp1\fP first border of linear interval 
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\fIp2\fP second border of linear interval 
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\fIs1\fP first border of logarithmic interval 
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\fIs2\fP second border of logarithmic interval 
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\fBReturns:\fP
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.IP "\fBexp((p - p1) / (p2 - p1) * log(s2 / s1)) * s1; \fP" 1c
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.RE
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.SS "\fBQwtScaleTransformation::Type\fP QwtScaleTransformation::type () const\fC [inline]\fP"\fBReturns:\fP
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Transformation type 
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.SS "double QwtScaleTransformation::xForm (doubles, doubles1, doubles2, doublep1, doublep2) const\fC [virtual]\fP"
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Transform a value between 2 linear intervals. \fBParameters:\fP
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\fIs\fP value related to the interval [s1, s2] 
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\fIs1\fP first border of scale interval 
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\fIs2\fP second border of scale interval 
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\fIp1\fP first border of target interval 
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\fIp2\fP second border of target interval 
.RE
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\fBReturns:\fP
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.IP "\fBlinear mapping:\fP" 1c
p1 + (p2 - p1) / (s2 - s1) * (s - s1) 
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.IP "\fBlog10 mapping: \fP" 1c
p1 + (p2 - p1) / log(s2 / s1) * log(s / s1) 
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.RE
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.SH "Author"
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