QwtSplineParametrization类 参考

用于样条插值的曲线参数化 更多...

#include <qwt_spline_parametrization.h>

Public 类型
enum	Type {   ParameterX , ParameterY , ParameterUniform , ParameterChordal ,   ParameterCentripetal , ParameterManhattan }
	Parametrization type 更多...

Public 成员函数
	QwtSplineParametrization (int type)
	构造函数
virtual	~QwtSplineParametrization ()
	析构函数
int	type () const
	获取参数化类型
virtual double	valueIncrement (const QPointF &, const QPointF &) const
	计算两个点的参数值增量

静态 Public 成员函数
static double	valueIncrementX (const QPointF &, const QPointF &)
	计算两个点的 ParameterX 值增量
static double	valueIncrementY (const QPointF &, const QPointF &)
	计算两个点的 ParameterY 值增量
static double	valueIncrementUniform (const QPointF &, const QPointF &)
	计算 ParameterUniform 值增量
static double	valueIncrementChordal (const QPointF &, const QPointF &)
	计算两个点的 ParameterChordal 值增量
static double	valueIncrementCentripetal (const QPointF &, const QPointF &)
	计算两个点的 ParameterCentripetal 值增量
static double	valueIncrementManhattan (const QPointF &, const QPointF &)
	计算两个点的 ParameterManhattan 值增量

详细描述

用于样条插值的曲线参数化

成员枚举类型说明

Type

enum QwtSplineParametrization::Type

Parametrization type

枚举值
ParameterX	No parametrization: t[i] = x[i] 参见 valueIncrementX()
ParameterY	No parametrization: t[i] = y[i] 参见 valueIncrementY()
ParameterUniform	Uniform parametrization: t[i] = i; A very fast parametrization, with good results, when the geometry of the control points is somehow "equidistant". F.e. when recording the position of a body, that is moving with constant speed every n seconds. 参见 valueIncrementUniform()
ParameterChordal	Parametrization using the chordal length between two control points The chordal length is the most commonly used approximation for the curve length. 参见 valueIncrementChordal()
ParameterCentripetal	Centripetal parametrization Based on the square root of the chordal length. Its name stems from the physical observations regarding the centripetal force, of a body moving along the curve. 参见 valueIncrementCentripetal()
ParameterManhattan	Parametrization using the manhattan length between two control points Approximating the curve length by the manhattan length is faster than the chordal length, but usually gives worse results. 参见 valueIncrementManhattan()

构造及析构函数说明

QwtSplineParametrization()

QwtSplineParametrization::QwtSplineParametrization ( int  type )

explicit

构造函数

~QwtSplineParametrization()

QwtSplineParametrization::~QwtSplineParametrization ( )

virtual

析构函数

成员函数说明

type()

int QwtSplineParametrization::type

(

)

const

获取参数化类型

valueIncrement()

double QwtSplineParametrization::valueIncrement ( const QPointF &  point1, const QPointF &  point2  ) const

virtual

计算两个点的参数值增量

valueIncrementCentripetal()

double QwtSplineParametrization::valueIncrementCentripetal ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

计算两个点的 ParameterCentripetal 值增量

valueIncrementChordal()

double QwtSplineParametrization::valueIncrementChordal ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

计算两个点的 ParameterChordal 值增量

valueIncrementManhattan()

double QwtSplineParametrization::valueIncrementManhattan ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

计算两个点的 ParameterManhattan 值增量

valueIncrementUniform()

double QwtSplineParametrization::valueIncrementUniform ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

计算 ParameterUniform 值增量

valueIncrementX()

double QwtSplineParametrization::valueIncrementX ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

计算两个点的 ParameterX 值增量

valueIncrementY()

double QwtSplineParametrization::valueIncrementY ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

计算两个点的 ParameterY 值增量

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/plot/qwt_spline_parametrization.h
• /home/runner/work/QWT/QWT/src/plot/qwt_spline_parametrization.cpp