.TH "QwtLog10ScaleEngine" 3 "Fri Apr 15 2011" "Version 6.0.0" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtLog10ScaleEngine \- 
.PP
A scale engine for logarithmic (base 10) scales.  

.SH SYNOPSIS
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.PP
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\fC#include <qwt_scale_engine.h>\fP
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Inherits \fBQwtScaleEngine\fP.
.SS "Public Member Functions"

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.RI "virtual void \fBautoScale\fP (int maxSteps, double &x1, double &x2, double &stepSize) const "
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.RI "virtual \fBQwtScaleDiv\fP \fBdivideScale\fP (double x1, double x2, int numMajorSteps, int numMinorSteps, double stepSize=0.0) const "
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.RI "virtual \fBQwtScaleTransformation\fP * \fBtransformation\fP () const "
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.SS "Protected Member Functions"

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.RI "\fBQwtInterval\fP \fBlog10\fP (const \fBQwtInterval\fP &) const "
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.RI "\fBQwtInterval\fP \fBpow10\fP (const \fBQwtInterval\fP &) const "
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.RI "\fBQwtInterval\fP \fBalign\fP (const \fBQwtInterval\fP &, double stepSize) const "
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.RI "void \fBbuildTicks\fP (const \fBQwtInterval\fP &, double stepSize, int maxMinSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const "
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.RI "QList< double > \fBbuildMajorTicks\fP (const \fBQwtInterval\fP &interval, double stepSize) const "
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.RI "QList< double > \fBbuildMinorTicks\fP (const QList< double > &majorTicks, int maxMinMark, double step) const "
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.SH "Detailed Description"
.PP 
A scale engine for logarithmic (base 10) scales. 

The step size is measured in *decades* 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.
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\fBWarning:\fP
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the step size as well as the margins are measured in *decades*. 
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.SH "Member Function Documentation"
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.SS "\fBQwtInterval\fP QwtLog10ScaleEngine::align (const \fBQwtInterval\fP &interval, doublestepSize) const\fC [protected]\fP"
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Align an interval to a step size. The limits of an interval are aligned that both are integer multiples of the step size.
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\fBParameters:\fP
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\fIinterval\fP Interval 
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\fIstepSize\fP Step size
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\fBReturns:\fP
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Aligned interval 
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.SS "void QwtLog10ScaleEngine::autoScale (intmaxNumSteps, double &x1, double &x2, double &stepSize) const\fC [virtual]\fP"Align and divide an interval
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\fBParameters:\fP
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\fImaxNumSteps\fP Max. number of steps 
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\fIx1\fP First limit of the interval (In/Out) 
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\fIx2\fP Second limit of the interval (In/Out) 
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\fIstepSize\fP Step size (Out)
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\fBSee also:\fP
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\fBQwtScaleEngine::setAttribute()\fP 
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Implements \fBQwtScaleEngine\fP.
.SS "QList< double > QwtLog10ScaleEngine::buildMajorTicks (const \fBQwtInterval\fP &interval, doublestepSize) const\fC [protected]\fP"
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Calculate major ticks for an interval. \fBParameters:\fP
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\fIinterval\fP Interval 
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\fIstepSize\fP Step size
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\fBReturns:\fP
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Calculated ticks 
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.SS "QList< double > QwtLog10ScaleEngine::buildMinorTicks (const QList< double > &majorTicks, intmaxMinSteps, doublestepSize) const\fC [protected]\fP"
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Calculate minor/medium ticks for major ticks. \fBParameters:\fP
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\fImajorTicks\fP Major ticks 
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\fImaxMinSteps\fP Maximum number of minor steps 
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\fIstepSize\fP Step size 
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.SS "void QwtLog10ScaleEngine::buildTicks (const \fBQwtInterval\fP &interval, doublestepSize, intmaxMinSteps, QList< double >ticks[QwtScaleDiv::NTickTypes]) const\fC [protected]\fP"
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Calculate ticks for an interval. \fBParameters:\fP
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\fIinterval\fP Interval 
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\fImaxMinSteps\fP Maximum number of minor steps 
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\fIstepSize\fP Step size 
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\fIticks\fP Arrays to be filled with the calculated ticks
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\fBSee also:\fP
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\fBbuildMajorTicks()\fP, \fBbuildMinorTicks\fP 
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.SS "\fBQwtScaleDiv\fP QwtLog10ScaleEngine::divideScale (doublex1, doublex2, intmaxMajSteps, intmaxMinSteps, doublestepSize = \fC0.0\fP) const\fC [virtual]\fP"
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Calculate a scale division. \fBParameters:\fP
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\fIx1\fP First interval limit 
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\fIx2\fP Second interval limit 
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\fImaxMajSteps\fP Maximum for the number of major steps 
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\fImaxMinSteps\fP Maximum number of minor steps 
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\fIstepSize\fP Step size. If stepSize == 0, the scaleEngine calculates one.
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\fBSee also:\fP
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QwtScaleEngine::stepSize(), QwtLog10ScaleEngine::subDivide() 
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.PP
Implements \fBQwtScaleEngine\fP.
.SS "\fBQwtInterval\fP QwtLog10ScaleEngine::log10 (const \fBQwtInterval\fP &interval) const\fC [protected]\fP"Return the interval [log10(interval.minValue(), log10(interval.maxValue] 
.SS "\fBQwtInterval\fP QwtLog10ScaleEngine::pow10 (const \fBQwtInterval\fP &interval) const\fC [protected]\fP"Return the interval [pow10(interval.minValue(), pow10(interval.maxValue] 
.SS "\fBQwtScaleTransformation\fP * QwtLog10ScaleEngine::transformation () const\fC [virtual]\fP"Return a transformation, for logarithmic (base 10) scales 
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Implements \fBQwtScaleEngine\fP.

.SH "Author"
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