Sources_For_Linux/Qwt/doc/man/man3/QwtLogTransform.3

.TH "QwtLogTransform" 3 "Mon Dec 28 2020" "Version 6.1.6" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtLogTransform \- Logarithmic transformation\&.  

.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_transform\&.h>\fP
.PP
Inherits \fBQwtTransform\fP\&.
.SS "Public Member Functions"

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.RI "\fBQwtLogTransform\fP ()"
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtLogTransform\fP ()"
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.RI "Destructor\&. "
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.RI "virtual double \fBtransform\fP (double value) const"
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.RI "virtual double \fBinvTransform\fP (double value) const"
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.RI "virtual double \fBbounded\fP (double value) const"
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.RI "virtual \fBQwtTransform\fP * \fBcopy\fP () const"
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.SS "Public Attributes"

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.RI "QT_STATIC_CONST double \fBLogMin\fP = 1\&.0e\-150"
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.RI "Smallest allowed value for logarithmic scales: 1\&.0e-150\&. "
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.RI "QT_STATIC_CONST double \fBLogMax\fP = 1\&.0e150"
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.RI "Largest allowed value for logarithmic scales: 1\&.0e150\&. "
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.SH "Detailed Description"
.PP 
Logarithmic transformation\&. 

\fBQwtLogTransform\fP modifies the values using log() and exp()\&.
.PP
\fBNote\fP
.RS 4
In the calculations of \fBQwtScaleMap\fP the base of the log function has no effect on the mapping\&. So \fBQwtLogTransform\fP can be used for log2(), log10() or any other logarithmic scale\&. 
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.SH "Member Function Documentation"
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.SS "double QwtLogTransform::bounded (double value) const\fC [virtual]\fP"

.PP
\fBParameters\fP
.RS 4
\fIvalue\fP Value to be bounded 
.RE
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\fBReturns\fP
.RS 4
qBound( LogMin, value, LogMax ) 
.RE
.PP

.PP
Reimplemented from \fBQwtTransform\fP\&.
.SS "\fBQwtTransform\fP * QwtLogTransform::copy () const\fC [virtual]\fP"

.PP
\fBReturns\fP
.RS 4
Clone of the transformation 
.RE
.PP

.PP
Implements \fBQwtTransform\fP\&.
.SS "double QwtLogTransform::invTransform (double value) const\fC [virtual]\fP"

.PP
\fBParameters\fP
.RS 4
\fIvalue\fP Value to be transformed 
.RE
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\fBReturns\fP
.RS 4
exp( value ) 
.RE
.PP

.PP
Implements \fBQwtTransform\fP\&.
.SS "double QwtLogTransform::transform (double value) const\fC [virtual]\fP"

.PP
\fBParameters\fP
.RS 4
\fIvalue\fP Value to be transformed 
.RE
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\fBReturns\fP
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log( value ) 
.RE
.PP

.PP
Implements \fBQwtTransform\fP\&.

.SH "Author"
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Generated automatically by Doxygen for Qwt User's Guide from the source code\&.