137 lines
2.7 KiB
Groff
137 lines
2.7 KiB
Groff
.TH "QwtLogTransform" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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QwtLogTransform \- Logarithmic transformation\&.
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.SH SYNOPSIS
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.br
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.PP
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.PP
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\fC#include <qwt_transform\&.h>\fP
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.PP
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Inherits \fBQwtTransform\fP\&.
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.SS "Public Member Functions"
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.in +1c
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.ti -1c
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.RI "\fBQwtLogTransform\fP ()"
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.br
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtLogTransform\fP ()"
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.br
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.RI "Destructor\&. "
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.ti -1c
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.RI "virtual double \fBtransform\fP (double value) const override"
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.br
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.ti -1c
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.RI "virtual double \fBinvTransform\fP (double value) const override"
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.br
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.ti -1c
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.RI "virtual double \fBbounded\fP (double value) const override"
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.br
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.ti -1c
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.RI "virtual \fBQwtTransform\fP * \fBcopy\fP () const override"
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.br
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.in -1c
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.SS "Static Public Attributes"
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.in +1c
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.RI "static const double \fBLogMin\fP = 1\&.0e\-150"
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.br
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.RI "Smallest allowed value for logarithmic scales: 1\&.0e-150\&. "
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.ti -1c
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.RI "static const double \fBLogMax\fP = 1\&.0e150"
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.br
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.RI "Largest allowed value for logarithmic scales: 1\&.0e150\&. "
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.in -1c
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.SH "Detailed Description"
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.PP
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Logarithmic transformation\&.
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\fBQwtLogTransform\fP modifies the values using log() and exp()\&.
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.PP
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\fBNote\fP
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.RS 4
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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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.RE
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.PP
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.PP
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Definition at line 100 of file qwt_transform\&.h\&.
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.SH "Member Function Documentation"
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.PP
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.SS "double QwtLogTransform::bounded (double value) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBParameters\fP
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.RS 4
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\fIvalue\fP Value to be bounded
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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qBound( LogMin, value, LogMax )
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.RE
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.PP
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.PP
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Reimplemented from \fBQwtTransform\fP\&.
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.PP
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Definition at line 106 of file qwt_transform\&.cpp\&.
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.SS "\fBQwtTransform\fP * QwtLogTransform::copy () const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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Clone of the transformation
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.RE
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.PP
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.PP
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Implements \fBQwtTransform\fP\&.
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.PP
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Definition at line 112 of file qwt_transform\&.cpp\&.
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.SS "double QwtLogTransform::invTransform (double value) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBParameters\fP
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.RS 4
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\fIvalue\fP Value to be transformed
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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exp( value )
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.RE
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.PP
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.PP
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Implements \fBQwtTransform\fP\&.
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.PP
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Definition at line 97 of file qwt_transform\&.cpp\&.
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.SS "double QwtLogTransform::transform (double value) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBParameters\fP
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.RS 4
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\fIvalue\fP Value to be transformed
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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log( value )
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.RE
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.PP
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.PP
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Implements \fBQwtTransform\fP\&.
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.PP
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Definition at line 88 of file qwt_transform\&.cpp\&.
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.SH "Author"
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.PP
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Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
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