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.TH "QwtLogScaleEngine" 3 "Thu Dec 11 2014" "Version 6.1.2" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtLogScaleEngine \-
.PP
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 "\fIDestructor\&. \fP"
.ti -1c
.RI "virtual void \fBautoScale\fP (int maxSteps, double &x1, double &x2, double &stepSize) const "
.br
.ti -1c
.RI "virtual \fBQwtScaleDiv\fP \fBdivideScale\fP (double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0\&.0) const "
.br
.RI "\fICalculate a scale division for an interval\&. \fP"
.in -1c
.SS "Protected Member Functions"
.in +1c
.ti -1c
.RI "\fBQwtInterval\fP \fBalign\fP (const \fBQwtInterval\fP &, double stepSize) const "
.br
.RI "\fIAlign an interval to a step size\&. \fP"
.ti -1c
.RI "void \fBbuildTicks\fP (const \fBQwtInterval\fP &, double stepSize, int maxMinSteps, QList< double > ticks[\fBQwtScaleDiv::NTickTypes\fP]) const "
.br
.RI "\fICalculate ticks for an interval\&. \fP"
.ti -1c
.RI "QList< double > \fBbuildMajorTicks\fP (const \fBQwtInterval\fP &interval, double stepSize) const "
.br
.RI "\fICalculate major ticks for an interval\&. \fP"
.ti -1c
.RI "void \fBbuildMinorTicks\fP (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > &mediumTicks) const "
.br
.RI "\fICalculate minor/medium ticks for major ticks\&. \fP"
.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 (uintbase = \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, doublestepSize) 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 (intmaxNumSteps, 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, doublestepSize) 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, intmaxMinorSteps, doublestepSize, 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, doublestepSize, intmaxMinorSteps, 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 (doublex1, doublex2, intmaxMajorSteps, intmaxMinorSteps, doublestepSize = \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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