QwtLogTransform类 参考

Logarithmic transformation 更多...

#include <qwt_transform.h>

类 QwtLogTransform 继承关系图:

Public 成员函数
	QwtLogTransform ()
	Constructor
	~QwtLogTransform () override
	Destructor
virtual double	transform (double value) const override
	Transformation function - log(value)
virtual double	invTransform (double value) const override
	Inverse transformation function - exp(value)
virtual double	bounded (double value) const override
	Bounded function - qBound(LogMin, value, LogMax)
virtual QwtTransform *	copy () const override
	Clone of the transformation
Public 成员函数 继承自 QwtTransform
	QwtTransform ()
	Constructor
virtual	~QwtTransform ()
	Destructor

静态 Public 属性
static const double	LogMin = 1.0e-150
	Smallest allowed value for logarithmic scales: 1.0e-150
static const double	LogMax = 1.0e150
	Largest allowed value for logarithmic scales: 1.0e150

详细描述

Logarithmic transformation

QwtLogTransform modifies the values using log() and exp().

注解

In the calculations of QwtScaleMap the base of the log function has no effect on the mapping. So QwtLogTransform can be used for log2(), log10() or any other logarithmic scale.

构造及析构函数说明

QwtLogTransform()

QwtLogTransform::QwtLogTransform

(

)

Constructor

Default constructor

成员函数说明

bounded()

double QwtLogTransform::bounded ( double  value ) const

overridevirtual

Bounded function - qBound(LogMin, value, LogMax)

Bounded function

参数

value

Value to be bounded

返回

qBound( LogMin, value, LogMax )

重载 QwtTransform .

copy()

QwtTransform * QwtLogTransform::copy ( ) const

overridevirtual

Clone of the transformation

返回

New QwtLogTransform instance

实现了 QwtTransform.

invTransform()

double QwtLogTransform::invTransform ( double  value ) const

overridevirtual

Inverse transformation function - exp(value)

Inverse transform function

参数

value

Value to be transformed

返回

exp( value )

实现了 QwtTransform.

transform()

double QwtLogTransform::transform ( double  value ) const

overridevirtual

Transformation function - log(value)

Transform function

参数

value

Value to be transformed

返回

log( value )

实现了 QwtTransform.

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/core/qwt_transform.h
• /home/runner/work/QWT/QWT/src/core/qwt_transform.cpp