Qwt3D::LogScale Class Reference

Log10 scale. More...

#include <qwt3d_scale.h>

Inheritance diagram for Qwt3D::LogScale:

Protected Member Functions
QString	ticLabel (unsigned int idx) const override
	Returns a power of 10 associated to the major value at index idx.
void	setMinors (int val) override
	Sets the minor intervals for the logarithmic scale.
	LogScale ()
	Default constructor - sets 9 minor intervals.
Scale *	clone () const override
	Returns a new heap based object utilized from ClonePtr.
void	calculate () override
	Creates major and minor vectors for the logarithmic scale.
Protected Member Functions inherited from Qwt3D::Scale
virtual void	setLimits (double start, double stop)
	Sets start and stop value for the scale.
virtual void	setMajors (int val)
	Sets number of major intervals.
virtual void	setMajorLimits (double start, double stop)
	Sets value of first and last major tic.
int	majors () const
	Returns major intervals.
int	minors () const
	Returns minor intervals.
virtual int	autoscale (double &a, double &b, double start, double stop, int ivals)
	Autoscales the axis.
const std::vector< double > &	majorTicks () const
	Returns const reference to major tic positions.
const std::vector< double > &	minorTicks () const
	Returns const reference to minor tic positions.
void	copyFrom (const Scale &other)
	Copies Scale base state from another Scale.

Friends
class	Axis
	Indices used to identify an axis.
class	ClonePtr< Scale >

Detailed Description

Log10 scale.

Member Function Documentation

calculate()

void LogScale::calculate ( )

overrideprotectedvirtual

Creates major and minor vectors for the logarithmic scale.

Warning

If the interval is too small, the scale becomes empty or will contain only a single major tic. There is no automatism (also not planned for now) for an 'intelligent' guess, what to do. Better switch manually to linear scales in such cases.

Implements Qwt3D::Scale.

clone()

Scale * LogScale::clone ( ) const

overrideprotectedvirtual

Returns a new heap based object utilized from ClonePtr.

Returns

A new LogScale copy

Implements Qwt3D::Scale.

setMinors()

void LogScale::setMinors ( int  val )

overrideprotectedvirtual

Sets the minor intervals for the logarithmic scale.

Parameters

val	Number of minor intervals (only 9, 5, 3, or 2 are accepted)

They will produce mantissa sets of {2,3,4,5,6,7,8,9}, {2,4,6,8}, {2,5} or {5} respectively.

Reimplemented from Qwt3D::Scale.

ticLabel()

QString LogScale::ticLabel ( unsigned int  idx ) const

overrideprotectedvirtual

Returns a power of 10 associated to the major value at index idx.

Parameters

idx	The current major tic index

Returns

The QString representation of 10^value for valid index, empty QString else

Reimplemented from Qwt3D::Scale.

Friends And Related Symbol Documentation

Axis

friend class Axis

friend

Indices used to identify an axis.

See also

Scale

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The documentation for this class was generated from the following files:

• /home/runner/work/QWT/QWT/src/plot3d/qwt3d_scale.h
• /home/runner/work/QWT/QWT/src/plot3d/qwt3d_scale.cpp