OCC.Core.Geom2dLProp module

Geom2dLProp module, see official documentation at https://www.opencascade.com/doc/occt-7.4.0/refman/html/package_geom2dlprop.html

class Geom2dLProp_CLProps2d(*args)

Bases: object

  • Initializes the local properties of the curve <C> The current point and the derivatives are computed at the same time, which allows an optimization of the computation time. <N> indicates the maximum number of derivations to be done (0, 1, 2 or 3). For example, to compute only the tangent, N should be equal to 1. <Resolution> is the linear tolerance (it is used to test if a vector is null).
    param C

    type C

    Geom2d_Curve

    param N

    type N

    int

    param Resolution

    type Resolution

    float

    rtype

    None* Same as previous constructor but here the parameter is set to the value <U>. All the computations done will be related to <C> and <U>.

    param C

    type C

    Geom2d_Curve

    param U

    type U

    float

    param N

    type N

    int

    param Resolution

    type Resolution

    float

    rtype

    None* Same as previous constructor but here the parameter is set to the value <U> and the curve is set with SetCurve. the curve can have a empty constructor All the computations done will be related to <C> and <U> when the functions ‘set’ will be done.

    param N

    type N

    int

    param Resolution

    type Resolution

    float

    rtype

    None

CentreOfCurvature()
  • Returns the centre of curvature <P>.
    param P

    type P

    gp_Pnt2d

    rtype

    None

Curvature()
  • Returns the curvature.
    rtype

    float

D1()
  • Returns the first derivative. The derivative is computed if it has not been yet.
    rtype

    gp_Vec2d

D2()
  • Returns the second derivative. The derivative is computed if it has not been yet.
    rtype

    gp_Vec2d

D3()
  • Returns the third derivative. The derivative is computed if it has not been yet.
    rtype

    gp_Vec2d

IsTangentDefined()
  • Returns True if the tangent is defined. For example, the tangent is not defined if the three first derivatives are all null.
    rtype

    bool

Normal()
  • Returns the normal direction <N>.
    param N

    type N

    gp_Dir2d

    rtype

    None

SetCurve()
  • Initializes the local properties of the curve for the new curve.
    param C

    type C

    Geom2d_Curve

    rtype

    None

SetParameter()
  • Initializes the local properties of the curve for the parameter value <U>.
    param U

    type U

    float

    rtype

    None

Tangent()
  • output the tangent direction <D>
    param D

    type D

    gp_Dir2d

    rtype

    None

Value()
  • Returns the Point.
    rtype

    gp_Pnt2d

property thisown

The membership flag

class Geom2dLProp_CurAndInf2d(*args)

Bases: OCC.Core.LProp.LProp_CurAndInf

  • Initializes the framework. Note: The curve on which the local properties are computed is defined using one of the following functions: Perform, PerformCurExt or PerformInf.
    rtype

    None

IsDone()
  • True if the solutions are found.
    rtype

    bool

Perform()
  • For the curve C, Computes both the inflection points and the maximum and minimum curvatures.
    param C

    type C

    Geom2d_Curve

    rtype

    None

PerformCurExt()
  • For the curve C, Computes the locals extremas of curvature.
    param C

    type C

    Geom2d_Curve

    rtype

    None

PerformInf()
  • For the curve C, Computes the inflections. After computation, the following functions can be used: - IsDone to check if the computation was successful - NbPoints to obtain the number of computed particular points - Parameter to obtain the parameter on the curve for each particular point - Type to check if the point is an inflection point or an extremum of curvature of the curve C. Warning These functions can be used to analyze a series of curves, however it is necessary to clear the table of results between each computation.
    param C

    type C

    Geom2d_Curve

    rtype

    None

property thisown

The membership flag

class Geom2dLProp_Curve2dTool

Bases: object

static Continuity()
  • returns the order of continuity of the curve <C>. returns 1first derivative only is computable returns 2first and second derivative only are computable. returns 3first, second and third are computable.
    param C

    type C

    Geom2d_Curve

    rtype

    int

static D1()
  • Computes the point <P> and first derivative <V1> of parameter <U> on the curve <C>.
    param C

    type C

    Geom2d_Curve

    param U

    type U

    float

    param P

    type P

    gp_Pnt2d

    param V1

    type V1

    gp_Vec2d

    rtype

    void

static D2()
  • Computes the point <P>, the first derivative <V1> and second derivative <V2> of parameter <U> on the curve <C>.
    param C

    type C

    Geom2d_Curve

    param U

    type U

    float

    param P

    type P

    gp_Pnt2d

    param V1

    type V1

    gp_Vec2d

    param V2

    type V2

    gp_Vec2d

    rtype

    void

static D3()
  • Computes the point <P>, the first derivative <V1>, the second derivative <V2> and third derivative <V3> of parameter <U> on the curve <C>.
    param C

    type C

    Geom2d_Curve

    param U

    type U

    float

    param P

    type P

    gp_Pnt2d

    param V1

    type V1

    gp_Vec2d

    param V2

    type V2

    gp_Vec2d

    param V3

    type V3

    gp_Vec2d

    rtype

    void

static FirstParameter()
  • returns the first parameter bound of the curve.
    param C

    type C

    Geom2d_Curve

    rtype

    float

static LastParameter()
  • returns the last parameter bound of the curve. FirstParameter must be less than LastParameter.
    param C

    type C

    Geom2d_Curve

    rtype

    float

static Value()
  • Computes the point <P> of parameter <U> on the curve <C>.
    param C

    type C

    Geom2d_Curve

    param U

    type U

    float

    param P

    type P

    gp_Pnt2d

    rtype

    void

property thisown

The membership flag

class Geom2dLProp_FuncCurExt(*args)

Bases: OCC.Core.math.math_FunctionWithDerivative

Parameters

C –

type C

Geom2d_Curve

param Tol

type Tol

float

rtype

None

IsMinKC()
  • True if Param corresponds to a minus of the radius of curvature.
    param Param

    type Param

    float

    rtype

    bool

property thisown

The membership flag

class Geom2dLProp_FuncCurNul(*args)

Bases: OCC.Core.math.math_FunctionWithDerivative

Parameters

C –

type C

Geom2d_Curve

rtype

None

property thisown

The membership flag

class Geom2dLProp_NumericCurInf2d(*args)

Bases: object

Return type

None

IsDone()
  • True if the solutions are found.
    rtype

    bool

PerformCurExt()
  • Computes the locals extremas of curvature.
    param C

    type C

    Geom2d_Curve

    param Result

    type Result

    LProp_CurAndInf

    rtype

    None* Computes the locals extremas of curvature. in the interval of parmeters [UMin,UMax].

    param C

    type C

    Geom2d_Curve

    param UMin

    type UMin

    float

    param UMax

    type UMax

    float

    param Result

    type Result

    LProp_CurAndInf

    rtype

    None

PerformInf()
  • Computes the inflections.
    param C

    type C

    Geom2d_Curve

    param Result

    type Result

    LProp_CurAndInf

    rtype

    None* Computes the inflections in the interval of parmeters [UMin,UMax].

    param C

    type C

    Geom2d_Curve

    param UMin

    type UMin

    float

    param UMax

    type UMax

    float

    param Result

    type Result

    LProp_CurAndInf

    rtype

    None

property thisown

The membership flag

class SwigPyIterator(*args, **kwargs)

Bases: object

advance()
copy()
decr()
distance()
equal()
incr()
next()
previous()
property thisown

The membership flag

value()