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.TH "QwtLogScaleEngine" 3 "Wed Jan 2 2019" "Version 6.1.4" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtLogScaleEngine \- A scale engine for logarithmic scales\&.
.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_scale_engine\&.h>\fP
.PP
Inherits \fBQwtScaleEngine\fP\&.
.SS "Public Member Functions"
.in +1c
.ti -1c
.RI "\fBQwtLogScaleEngine\fP (uint \fBbase\fP=10)"
.br
.ti -1c
.RI "virtual \fB~QwtLogScaleEngine\fP ()"
.br
.RI "Destructor\&. "
.ti -1c
.RI "virtual void \fBautoScale\fP (int maxNumSteps, double &x1, double &x2, double &stepSize) const"
.br
.ti -1c
.RI "virtual \fBQwtScaleDiv\fP \fBdivideScale\fP (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize=0\&.0) const"
.br
.RI "Calculate a scale division for an interval\&. "
.in -1c
.SS "Protected Member Functions"
.in +1c
.ti -1c
.RI "\fBQwtInterval\fP \fBalign\fP (const \fBQwtInterval\fP &, double stepSize) const"
.br
.RI "Align an interval to a step size\&. "
.ti -1c
.RI "void \fBbuildTicks\fP (const \fBQwtInterval\fP &, double stepSize, int maxMinorSteps, QList< double > ticks[\fBQwtScaleDiv::NTickTypes\fP]) const"
.br
.RI "Calculate ticks for an interval\&. "
.ti -1c
.RI "QList< double > \fBbuildMajorTicks\fP (const \fBQwtInterval\fP &interval, double stepSize) const"
.br
.RI "Calculate major ticks for an interval\&. "
.ti -1c
.RI "void \fBbuildMinorTicks\fP (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > &mediumTicks) const"
.br
.RI "Calculate minor/medium ticks for major ticks\&. "
.in -1c
.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP
A scale engine for logarithmic scales\&.
The step size is measured in \fIdecades\fP and the major step size will be adjusted to fit the pattern $\left\{ 1,2,3,5\right\} \cdot 10^{n}$, where n is a natural number including zero\&.
.PP
\fBWarning:\fP
.RS 4
the step size as well as the margins are measured in \fIdecades\fP\&.
.RE
.PP
.SH "Constructor & Destructor Documentation"
.PP
.SS "QwtLogScaleEngine::QwtLogScaleEngine (uint base = \fC10\fP)"
Constructor
.PP
\fBParameters:\fP
.RS 4
\fIbase\fP Base of the scale engine
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetBase()\fP
.RE
.PP
.SH "Member Function Documentation"
.PP
.SS "\fBQwtInterval\fP QwtLogScaleEngine::align (const \fBQwtInterval\fP & interval, double stepSize) const\fC [protected]\fP"
.PP
Align an interval to a step size\&. The limits of an interval are aligned that both are integer multiples of the step size\&.
.PP
\fBParameters:\fP
.RS 4
\fIinterval\fP Interval
.br
\fIstepSize\fP Step size
.RE
.PP
\fBReturns:\fP
.RS 4
Aligned interval
.RE
.PP
.SS "void QwtLogScaleEngine::autoScale (int maxNumSteps, double & x1, double & x2, double & stepSize) const\fC [virtual]\fP"
Align and divide an interval
.PP
\fBParameters:\fP
.RS 4
\fImaxNumSteps\fP Max\&. number of steps
.br
\fIx1\fP First limit of the interval (In/Out)
.br
\fIx2\fP Second limit of the interval (In/Out)
.br
\fIstepSize\fP Step size (Out)
.RE
.PP
\fBSee also:\fP
.RS 4
\fBQwtScaleEngine::setAttribute()\fP
.RE
.PP
.PP
Implements \fBQwtScaleEngine\fP\&.
.SS "QList< double > QwtLogScaleEngine::buildMajorTicks (const \fBQwtInterval\fP & interval, double stepSize) const\fC [protected]\fP"
.PP
Calculate major ticks for an interval\&.
.PP
\fBParameters:\fP
.RS 4
\fIinterval\fP Interval
.br
\fIstepSize\fP Step size
.RE
.PP
\fBReturns:\fP
.RS 4
Calculated ticks
.RE
.PP
.SS "void QwtLogScaleEngine::buildMinorTicks (const QList< double > & majorTicks, int maxMinorSteps, double stepSize, QList< double > & minorTicks, QList< double > & mediumTicks) const\fC [protected]\fP"
.PP
Calculate minor/medium ticks for major ticks\&.
.PP
\fBParameters:\fP
.RS 4
\fImajorTicks\fP Major ticks
.br
\fImaxMinorSteps\fP Maximum number of minor steps
.br
\fIstepSize\fP Step size
.br
\fIminorTicks\fP Array to be filled with the calculated minor ticks
.br
\fImediumTicks\fP Array to be filled with the calculated medium ticks
.RE
.PP
.SS "void QwtLogScaleEngine::buildTicks (const \fBQwtInterval\fP & interval, double stepSize, int maxMinorSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const\fC [protected]\fP"
.PP
Calculate ticks for an interval\&.
.PP
\fBParameters:\fP
.RS 4
\fIinterval\fP Interval
.br
\fImaxMinorSteps\fP Maximum number of minor steps
.br
\fIstepSize\fP Step size
.br
\fIticks\fP Arrays to be filled with the calculated ticks
.RE
.PP
\fBSee also:\fP
.RS 4
\fBbuildMajorTicks()\fP, \fBbuildMinorTicks\fP
.RE
.PP
.SS "\fBQwtScaleDiv\fP QwtLogScaleEngine::divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize = \fC0\&.0\fP) const\fC [virtual]\fP"
.PP
Calculate a scale division for an interval\&.
.PP
\fBParameters:\fP
.RS 4
\fIx1\fP First interval limit
.br
\fIx2\fP Second interval limit
.br
\fImaxMajorSteps\fP Maximum for the number of major steps
.br
\fImaxMinorSteps\fP Maximum number of minor steps
.br
\fIstepSize\fP Step size\&. If stepSize == 0, the engine calculates one\&.
.RE
.PP
\fBReturns:\fP
.RS 4
Calculated scale division
.RE
.PP
.PP
Implements \fBQwtScaleEngine\fP\&.
.SH "Author"
.PP
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
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