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

opencascade::handle<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 . All the computations done will be related to <C> and .

param C

type C

opencascade::handle<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 and the curve is set with SetCurve. the curve can have a empty constructor All the computations done will be related to <C> and 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 .

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

opencascade::handle<Geom2d_Curve> &

rtype

None

SetParameter()¶

Initializes the local properties of the curve for the parameter value .

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

opencascade::handle<Geom2d_Curve> &

rtype

None

PerformCurExt()¶

For the curve C, Computes the locals extremas of curvature.

param C

type C

opencascade::handle<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

opencascade::handle<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

opencascade::handle<Geom2d_Curve> &

rtype

int

static D1()¶

Computes the point and first derivative <V1> of parameter on the curve <C>.

param C

type C

opencascade::handle<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 , the first derivative <V1> and second derivative <V2> of parameter on the curve <C>.

param C

type C

opencascade::handle<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 , the first derivative <V1>, the second derivative <V2> and third derivative <V3> of parameter on the curve <C>.

param C

type C

opencascade::handle<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

opencascade::handle<Geom2d_Curve> &

rtype

float

static LastParameter()¶

returns the last parameter bound of the curve. FirstParameter must be less than LastParameter.

param C

type C

opencascade::handle<Geom2d_Curve> &

rtype

float

static Value()¶

Computes the point of parameter on the curve <C>.

param C

type C

opencascade::handle<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: opencascade::handle<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: opencascade::handle<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

opencascade::handle<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

opencascade::handle<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

opencascade::handle<Geom2d_Curve> &

param Result

type Result

LProp_CurAndInf &

rtype

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

param C

type C

opencascade::handle<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()¶