ParametricCurve2d类 参考

类 ParametricCurve2d 继承关系图:

Public 成员函数
	ParametricCurve2d (TopoShape edge)
long	GetOwnerId ()
void	SetOwnerId (long val)
boolean	IsValidGeometry ()
boolean	Initialize (TopoShape edge)
boolean	InitializeByLine (GLin2d line)
boolean	InitializeBySegment (GPnt2d start, GPnt2d end)
boolean	InitializeByCircle (GCirc2d circle)
boolean	InitializeByArc (GCirc2d circle, double u1, double u2)
boolean	InitializeByHypr (GHypr2d curve, double u1, double u2)
boolean	InitializeByParab (GParab2d curve, double u1, double u2)
boolean	InitializeByBSpline (GBSplineCurve2d curve)
boolean	InitializeByBezier (GBezierCurve2d curve)
EnumCurveType	GetCurveType ()
boolean	Is3DCurve ()
double	FirstParameter ()
double	LastParameter ()
EnumGeometryContinuity	Continuity ()
boolean	IsClosed ()
boolean	IsPeriodic ()
double	Period ()
GPnt2d	Value (double u)
GVec2d	Normal (double u)
GPnt2d	D0 (double u)
DerivativeValues2d	D1 (double u)
DerivativeValues2d	D2 (double u)
DerivativeValues2d	D3 (double u)
GVec2d	DN (double u, int n)
GPnt2d	GetStartPoint ()
GPnt2d	GetEndPoint ()
GBBox	GetBBox ()
double	GetLength ()
double	ComputeLength (double u1, double u2)
double	ComputePointByDistance (double u0, double offset)
DoubleList	SplitByUniformLength (double length, double tolerance)
GLin2d	TryLine ()
GCirc2d	TryCircle ()
GElips2d	TryEllipse ()
GHypr2d	TryHyperbola ()
GParab2d	TryParabola ()
GBSplineCurve2d	TryBSplineCurve ()
GBezierCurve2d	TryBezierCurve ()
Public 成员函数 继承自 ParametricGeometry
long	GetId ()
void	SetId (long val)
TopoShape	GetShape ()

额外继承的成员函数
静态 Public 成员函数 继承自 ParametricGeometry
static GPnt	GetPointValue (TopoShape vertex)

详细描述

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二维曲线的几何参数表达，用来获取曲线上点、切线等信息。

构造及析构函数说明

ParametricCurve2d()

ParametricCurve2d.ParametricCurve2d

(

TopoShape

edge

)

使用2D边拓扑对象构造和初始化

参数

edge

边

成员函数说明

ComputeLength()

double ParametricCurve2d.ComputeLength	(	double	u1,
		double	u2 )

计算指定区间的长度

参数

u1	起始参数
u2	终止参数

返回

长度

ComputePointByDistance()

double ParametricCurve2d.ComputePointByDistance	(	double	u0,
		double	offset )

Compute the point with the distance to u0.

参数

u0	the parameter of the start point.
offset	the distance.

返回

the parameter of the point. retun u0 if not found.

Continuity()

EnumGeometryContinuity ParametricCurve2d.Continuity

(

)

获取连续性

返回

EnumGeometryContinuity

D0()

GPnt2d ParametricCurve2d.D0

(

double

u

)

Computes the point of parameter U on the curve.

参数

u	the parameter

返回

the point.

D1()

DerivativeValues2d ParametricCurve2d.D1

(

double

u

)

Computes the point and derivative of parameter U on the curve.

参数

u	the parameter

返回

the point and the first derivative. Empty if not C1

D2()

DerivativeValues2d ParametricCurve2d.D2

(

double

u

)

Computes the point and derivative of parameter U on the curve.

参数

u	the parameter

返回

the point, the first and second derivative. Empty if not C2.

D3()

DerivativeValues2d ParametricCurve2d.D3

(

double

u

)

Computes the point and derivative of parameter U on the curve.

参数

u	the parameter

返回

the point, the first, the second and the third derivative. Empty if not C3.

DN()

GVec2d ParametricCurve2d.DN	(	double	u,
		int	n )

The returned vector gives the value of the derivative for the order of derivation N.

参数

u	the parameter
n	the order of derivation

返回

the vector. Return zero if not CN or N < 1.

FirstParameter()

double ParametricCurve2d.FirstParameter

(

)

起点参数

返回

参数

GetBBox()

GBBox ParametricCurve2d.GetBBox

(

)

Compute the bounding box.

返回

the box.

GetCurveType()

EnumCurveType ParametricCurve2d.GetCurveType

(

)

Get the curve type.
enum EnumCurveType

返回

the point.

GetEndPoint()

GPnt2d ParametricCurve2d.GetEndPoint

(

)

获取终点坐标.

返回

the end point.

GetLength()

double ParametricCurve2d.GetLength

(

)

计算长度

返回

长度

GetStartPoint()

GPnt2d ParametricCurve2d.GetStartPoint

(

)

获取起始点坐标.

返回

the start point.

Initialize()

boolean ParametricCurve2d.Initialize

(

TopoShape

edge

)

使用2D的边来初始化对象.

参数

edge

边

返回

true if ok.

重载 ParametricGeometry .

Is3DCurve()

boolean ParametricCurve2d.Is3DCurve

(

)

Is 3D Curve.

IsClosed()

boolean ParametricCurve2d.IsClosed

(

)

Is Closed.

IsPeriodic()

boolean ParametricCurve2d.IsPeriodic

(

)

Is Periodic.

IsValidGeometry()

boolean ParametricCurve2d.IsValidGeometry

(

)

Test if valid.

重载 ParametricGeometry .

LastParameter()

double ParametricCurve2d.LastParameter

(

)

终点参数

返回

参数

Normal()

GVec2d ParametricCurve2d.Normal

(

double

u

)

计算法向的值

参数

u

参数

返回

法向

Period()

double ParametricCurve2d.Period

(

)

The period.

SplitByUniformLength()

DoubleList ParametricCurve2d.SplitByUniformLength	(	double	length,
		double	tolerance )

拆分为等长度的线段.

参数

length	the length of each part.
tolerance	误差

返回

the parameters of each part.

TryBezierCurve()

GBezierCurve2d ParametricCurve2d.TryBezierCurve

(

)

转成贝塞尔曲线。转之前调用GetCurveType判断类型

返回

对象

TryBSplineCurve()

GBSplineCurve2d ParametricCurve2d.TryBSplineCurve

(

)

转成样条曲线。转之前调用GetCurveType判断类型

返回

对象

TryCircle()

GCirc2d ParametricCurve2d.TryCircle

(

)

转换为圆弧对象

返回

对象

TryEllipse()

GElips2d ParametricCurve2d.TryEllipse

(

)

转换为椭圆弧对象

返回

对象

TryHyperbola()

GHypr2d ParametricCurve2d.TryHyperbola

(

)

转换为双曲线对象

返回

对象

TryLine()

GLin2d ParametricCurve2d.TryLine

(

)

转换为直线对象

返回

对象

TryParabola()

GParab2d ParametricCurve2d.TryParabola

(

)

转换为抛物线对象

返回

对象

Value()

GPnt2d ParametricCurve2d.Value

(

double

u

)

计算点的值.

参数

u	the parameter

返回

the point.