OCC.Core.Law module¶

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

class Law_BSpFunc(*args)¶

Bases: OCC.Core.Law.Law_Function

Return type: None:param C: :type C: Law_BSpline :param First: :type First: float :param Last: :type Last: float :rtype: None

Curve()¶

Return type: opencascade::handle<Law_BSpline>

static DownCast(t)¶

SetCurve()¶

Parameters

C –

type C: Law_BSpline
rtype: None

property thisown¶: The membership flag

class Law_BSpline(*args)¶

Bases: OCC.Core.Standard.Standard_Transient

Creates a non-rational B_spline curve on the basis <Knots, Multiplicities> of degree <Degree>.

param Poles

type Poles

TColStd_Array1OfReal

param Knots

type Knots

TColStd_Array1OfReal

param Multiplicities

type Multiplicities

TColStd_Array1OfInteger

param Degree

type Degree

int

param Periodic

default value is Standard_False

type Periodic

bool

rtype

None* Creates a rational B_spline curve on the basis <Knots, Multiplicities> of degree <Degree>.

param Poles

type Poles

TColStd_Array1OfReal

param Weights

type Weights

TColStd_Array1OfReal

param Knots

type Knots

TColStd_Array1OfReal

param Multiplicities

type Multiplicities

TColStd_Array1OfInteger

param Degree

type Degree

int

param Periodic

default value is Standard_False

type Periodic

bool

rtype

None

Continuity()¶

Returns the global continuity of the curveC0only geometric continuity, C1continuity of the first derivative all along the Curve, C2continuity of the second derivative all along the Curve, C3continuity of the third derivative all along the Curve, CNthe order of continuity is infinite. For a B-spline curve of degree d if a knot Ui has a multiplicity p the B-spline curve is only Cd-p continuous at Ui. So the global continuity of the curve can’t be greater than Cd-p where p is the maximum multiplicity of the interior Knots. In the interior of a knot span the curve is infinitely continuously differentiable.

rtype

GeomAbs_Shape

Copy()¶

Return type: opencascade::handle<Law_BSpline>

D0()¶

Parameters

U –

type U: float
param P
type P: float
rtype: None

D1()¶

Parameters

U –

type U: float
param P
type P: float
param V1
type V1: float
rtype: None

D2()¶

Parameters

U –

type U: float
param P
type P: float
param V1
type V1: float
param V2
type V2: float
rtype: None

D3()¶

Parameters

U –

type U: float
param P
type P: float
param V1
type V1: float
param V2
type V2: float
param V3
type V3: float
rtype: None

DN()¶

The following functions computes the point of parameter U and the derivatives at this point on the B-spline curve arc defined between the knot FromK1 and the knot ToK2. U can be out of bounds [Knot (FromK1), Knot (ToK2)] but for the computation we only use the definition of the curve between these two knots. This method is useful to compute local derivative, if the order of continuity of the whole curve is not greater enough. Inside the parametric domain Knot (FromK1), Knot (ToK2) the evaluations are the same as if we consider the whole definition of the curve. Of course the evaluations are different outside this parametric domain.

param U

type U

float

param N

type N

int

rtype

float

Degree()¶

Computation of value and derivatives

rtype

int

static DownCast(t)¶

EndPoint()¶

Returns the last point of the curve. WarningsThe last point of the curve is different from the last pole of the curve if the multiplicity of the last knot is lower than Degree.

rtype

float

FirstParameter()¶

Computes the parametric value of the start point of the curve. It is a knot value.

rtype

float

FirstUKnotIndex()¶

For a B-spline curve the first parameter (which gives the start point of the curve) is a knot value but if the multiplicity of the first knot index is lower than Degree + 1 it is not the first knot of the curve. This method computes the index of the knot corresponding to the first parameter.

rtype

int

IncreaseDegree()¶

Increase the degree to <Degree>. Nothing is done if <Degree> is lower or equal to the current degree.

param Degree

type Degree

int

rtype

None

IncreaseMultiplicity()¶

Increases the multiplicity of the knot <Index> to <M>. //! If <M> is lower or equal to the current multiplicity nothing is done. If <M> is higher than the degree the degree is used. If <Index> is not in [FirstUKnotIndex, LastUKnotIndex]

param Index

type Index

int

param M

type M

int

rtype

None* Increases the multiplicities of the knots in [I1,I2] to <M>. //! For each knot if <M> is lower or equal to the current multiplicity nothing is done. If <M> is higher than the degree the degree is used. If <I1,I2> are not in [FirstUKnotIndex, LastUKnotIndex]

param I1

type I1

int

param I2

type I2

int

param M

type M

int

rtype

None

IncrementMultiplicity()¶

Increment the multiplicities of the knots in [I1,I2] by <M>. //! If <M> is not positive nithing is done. //! For each knot the resulting multiplicity is limited to the Degree. If <I1,I2> are not in [FirstUKnotIndex, LastUKnotIndex]

param I1

type I1

int

param I2

type I2

int

param M

type M

int

rtype

None

InsertKnot()¶

Inserts a knot value in the sequence of knots. If <U> is an existing knot the multiplicity is increased by <M>. //! If U is not on the parameter range nothing is done. //! If the multiplicity is negative or null nothing is done. The new multiplicity is limited to the degree. //! The tolerance criterion for knots equality is the max of Epsilon(U) and ParametricTolerance.

param U

type U

float

param M

default value is 1

type M

int

param ParametricTolerance

default value is 0.0

type ParametricTolerance

float

param Add

default value is Standard_True

type Add

bool

rtype

None

InsertKnots()¶

Inserts a set of knots values in the sequence of knots. //! For each U = Knots(i), M = Mults(i) //! If <U> is an existing knot the multiplicity is increased by <M> if <Add> is True, increased to <M> if <Add> is False. //! If U is not on the parameter range nothing is done. //! If the multiplicity is negative or null nothing is done. The new multiplicity is limited to the degree. //! The tolerance criterion for knots equality is the max of Epsilon(U) and ParametricTolerance.

param Knots

type Knots

TColStd_Array1OfReal

param Mults

type Mults

TColStd_Array1OfInteger

param ParametricTolerance

default value is 0.0

type ParametricTolerance

float

param Add

default value is Standard_False

type Add

bool

rtype

None

IsCN()¶

Returns the continuity of the curve, the curve is at least C0. Raised if N < 0.

param N

type N

int

rtype

bool

IsClosed()¶

Returns true if the distance between the first point and the last point of the curve is lower or equal to Resolution from package gp. WarningsThe first and the last point can be different from the first pole and the last pole of the curve.

rtype

bool

IsPeriodic()¶

Returns True if the curve is periodic.

rtype

bool

IsRational()¶

Returns True if the weights are not identical. The tolerance criterion is Epsilon of the class Real.

rtype

bool

Knot()¶

Returns the knot of range Index. When there is a knot with a multiplicity greater than 1 the knot is not repeated. The method Multiplicity can be used to get the multiplicity of the Knot. Raised if Index < 1 or Index > NbKnots

param Index

type Index

int

rtype

float

KnotDistribution()¶

Returns NonUniform or Uniform or QuasiUniform or PiecewiseBezier. If all the knots differ by a positive constant from the preceding knot the BSpline Curve can be- Uniform if all the knots are of multiplicity 1, - QuasiUniform if all the knots are of multiplicity 1 except for the first and last knot which are of multiplicity Degree + 1, - PiecewiseBezier if the first and last knots have multiplicity Degree + 1 and if interior knots have multiplicity Degree A piecewise Bezier with only two knots is a BezierCurve. else the curve is non uniform. The tolerance criterion is Epsilon from class Real.

rtype

GeomAbs_BSplKnotDistribution

KnotSequence()¶

Returns the knots sequence. In this sequence the knots with a multiplicity greater than 1 are repeated. ExampleK = {k1, k1, k1, k2, k3, k3, k4, k4, k4} //! Raised if the length of K is not equal to NbPoles + Degree + 1

param K

type K

TColStd_Array1OfReal

rtype

None

Knots()¶

returns the knot values of the B-spline curve; //! Raised if the length of K is not equal to the number of knots.

param K

type K

TColStd_Array1OfReal

rtype

None

LastParameter()¶

Computes the parametric value of the end point of the curve. It is a knot value.

rtype

float

LastUKnotIndex()¶

For a BSpline curve the last parameter (which gives the end point of the curve) is a knot value but if the multiplicity of the last knot index is lower than Degree + 1 it is not the last knot of the curve. This method computes the index of the knot corresponding to the last parameter.

rtype

int

LocalD0()¶

Parameters

U –

type U: float
param FromK1
type FromK1: int
param ToK2
type ToK2: int
param P
type P: float
rtype: None

LocalD1()¶

Parameters

U –

type U: float
param FromK1
type FromK1: int
param ToK2
type ToK2: int
param P
type P: float
param V1
type V1: float
rtype: None

LocalD2()¶

Parameters

U –

type U: float
param FromK1
type FromK1: int
param ToK2
type ToK2: int
param P
type P: float
param V1
type V1: float
param V2
type V2: float
rtype: None

LocalD3()¶

Parameters

U –

type U: float
param FromK1
type FromK1: int
param ToK2
type ToK2: int
param P
type P: float
param V1
type V1: float
param V2
type V2: float
param V3
type V3: float
rtype: None

LocalDN()¶

Parameters

U –

type U: float
param FromK1
type FromK1: int
param ToK2
type ToK2: int
param N
type N: int
rtype: float

LocalValue()¶

Parameters

U –

type U: float
param FromK1
type FromK1: int
param ToK2
type ToK2: int
rtype: float

LocateU()¶

Locates the parametric value U in the sequence of knots. If ‘WithKnotRepetition’ is True we consider the knot’s representation with repetition of multiple knot value, otherwise we consider the knot’s representation with no repetition of multiple knot values. Knots (I1) <= U <= Knots (I2) . if I1 = I2 U is a knot value (the tolerance criterion ParametricTolerance is used). . if I1 < 1 => U < Knots (1) - Abs(ParametricTolerance) . if I2 > NbKnots => U > Knots (NbKnots) + Abs(ParametricTolerance)

param U

type U

float

param ParametricTolerance

type ParametricTolerance

float

param I1

type I1

int

param I2

type I2

int

param WithKnotRepetition

default value is Standard_False

type WithKnotRepetition

bool

rtype

None

static MaxDegree()¶

Returns the value of the maximum degree of the normalized B-spline basis functions in this package.

rtype

int

MovePointAndTangent()¶

Changes the value of the Law at parameter U to NewValue. and makes its derivative at U be derivative. StartingCondition = -1 means first can move EndingCondition = -1 means last point can move StartingCondition = 0 means the first point cannot move EndingCondition = 0 means the last point cannot move StartingCondition = 1 means the first point and tangent cannot move EndingCondition = 1 means the last point and tangent cannot move and so forth ErrorStatus != 0 means that there are not enought degree of freedom with the constrain to deform the curve accordingly

param U

type U

float

param NewValue

type NewValue

float

param Derivative

type Derivative

float

param Tolerance

type Tolerance

float

param StartingCondition

type StartingCondition

int

param EndingCondition

type EndingCondition

int

param ErrorStatus

type ErrorStatus

int

rtype

None

Multiplicities()¶

Returns the multiplicity of the knots of the curve. //! Raised if the length of M is not equal to NbKnots.

param M

type M

TColStd_Array1OfInteger

rtype

None

Multiplicity()¶

Returns the multiplicity of the knots of range Index. Raised if Index < 1 or Index > NbKnots

param Index

type Index

int

rtype

int

NbKnots()¶

Returns the number of knots. This method returns the number of knot without repetition of multiple knots.

rtype

int

NbPoles()¶

Returns the number of poles

rtype

int

PeriodicNormalization()¶

returns the parameter normalized within the period if the curve is periodicotherwise does not do anything

param U

type U

float

rtype

None

Pole()¶

Returns the pole of range Index. Raised if Index < 1 or Index > NbPoles.

param Index

type Index

int

rtype

float

Poles()¶

Returns the poles of the B-spline curve; //! Raised if the length of P is not equal to the number of poles.

param P

type P

TColStd_Array1OfReal

rtype

None

RemoveKnot()¶

Decrement the knots multiplicity to <M>. If M is 0 the knot is removed. The Poles sequence is modified. //! As there are two ways to compute the new poles the average is computed if the distance is lower than the <Tolerance>, else False is returned. //! A low tolerance is used to prevent the modification of the curve. //! A high tolerance is used to ‘smooth’ the curve. //! Raised if Index is not in the range [FirstUKnotIndex, LastUKnotIndex] pole insertion and pole removing this operation is limited to the Uniform or QuasiUniform BSplineCurve. The knot values are modified . If the BSpline is NonUniform or Piecewise Bezier an exception Construction error is raised.

param Index

type Index

int

param M

type M

int

param Tolerance

type Tolerance

float

rtype

bool

Resolution()¶

given Tolerance3D returns UTolerance such that if f(t) is the curve we have | t1 - t0| < Utolerance ===> |f(t1) - f(t0)| < Tolerance3D

param Tolerance3D

type Tolerance3D

float

param UTolerance

type UTolerance

float

rtype

None

Reverse()¶

Changes the direction of parametrization of <self>. The Knot sequence is modified, the FirstParameter and the LastParameter are not modified. The StartPoint of the initial curve becomes the EndPoint of the reversed curve and the EndPoint of the initial curve becomes the StartPoint of the reversed curve.

rtype

None

ReversedParameter()¶

Returns the parameter on the reversed curve for the point of parameter U on <self>. //! returns UFirst + ULast - U

param U

type U

float

rtype

float

Segment()¶

Segments the curve between U1 and U2. The control points are modified, the first and the last point are not the same. WarningsEven if <self> is not closed it can become closed after the segmentation for example if U1 or U2 are out of the bounds of the curve <self> or if the curve makes loop. After the segmentation the length of a curve can be null. raises if U2 < U1.

param U1

type U1

float

param U2

type U2

float

rtype

None

SetKnot()¶

Changes the knot of range Index. The multiplicity of the knot is not modified. Raised if K >= Knots(Index+1) or K <= Knots(Index-1). Raised if Index < 1 || Index > NbKnots

param Index

type Index

int

param K

type K

float

rtype

None* Changes the knot of range Index with its multiplicity. You can increase the multiplicity of a knot but it is not allowed to decrease the multiplicity of an existing knot. //! Raised if K >= Knots(Index+1) or K <= Knots(Index-1). Raised if M is greater than Degree or lower than the previous multiplicity of knot of range Index. Raised if Index < 1 || Index > NbKnots

param Index

type Index

int

param K

type K

float

param M

type M

int

rtype

None

SetKnots()¶

Changes all the knots of the curve The multiplicity of the knots are not modified. //! Raised if there is an index such that K (Index+1) <= K (Index). //! Raised if K.Lower() < 1 or K.Upper() > NbKnots

param K

type K

TColStd_Array1OfReal

rtype

None

SetNotPeriodic()¶

Makes a non periodic curve. If the curve was non periodic the curve is not modified.

rtype

None

SetOrigin()¶

Set the origin of a periodic curve at Knot(index) KnotVector and poles are modified. Raised if the curve is not periodic Raised if index not in the range [FirstUKnotIndex , LastUKnotIndex]

param Index

type Index

int

rtype

None

SetPeriodic()¶

Makes a closed B-spline into a periodic curve. The curve is periodic if the knot sequence is periodic and if the curve is closed (The tolerance criterion is Resolution from gp). The period T is equal to Knot(LastUKnotIndex) - Knot(FirstUKnotIndex). A periodic B-spline can be uniform or not. Raised if the curve is not closed.

rtype

None

SetPole()¶

Substitutes the Pole of range Index with P. //! Raised if Index < 1 || Index > NbPoles

param Index

type Index

int

param P

type P

float

rtype

None* Substitutes the pole and the weight of range Index. If the curve <self> is not rational it can become rational If the curve was rational it can become non rational //! Raised if Index < 1 || Index > NbPoles Raised if Weight <= 0.0

param Index

type Index

int

param P

type P

float

param Weight

type Weight

float

rtype

None

SetWeight()¶

Changes the weight for the pole of range Index. If the curve was non rational it can become rational. If the curve was rational it can become non rational. //! Raised if Index < 1 || Index > NbPoles Raised if Weight <= 0.0

param Index

type Index

int

param Weight

type Weight

float

rtype

None

StartPoint()¶

Returns the start point of the curve. WarningsThis point is different from the first pole of the curve if the multiplicity of the first knot is lower than Degree.

rtype

float

Value()¶

Parameters

U –

type U: float
rtype: float

Weight()¶

Returns the weight of the pole of range Index . Raised if Index < 1 or Index > NbPoles.

param Index

type Index

int

rtype

float

Weights()¶

Returns the weights of the B-spline curve; //! Raised if the length of W is not equal to NbPoles.

param W

type W

TColStd_Array1OfReal

rtype

None

property thisown¶: The membership flag

class Law_BSplineKnotSplitting(*args)¶

Bases: object

Locates the knot values which correspond to the segmentation of the curve into arcs with a continuity equal to ContinuityRange. //! Raised if ContinuityRange is not greater or equal zero.

param BasisLaw

type BasisLaw

Law_BSpline

param ContinuityRange

type ContinuityRange

int

rtype

None

NbSplits()¶

Returns the number of knots corresponding to the splitting.

rtype

int

SplitValue()¶

Returns the index of the knot corresponding to the splitting of range Index. //! Raised if Index < 1 or Index > NbSplits

param Index

type Index

int

rtype

int

Splitting()¶

Returns the indexes of the BSpline curve knots corresponding to the splitting. //! Raised if the length of SplitValues is not equal to NbSPlit.

param SplitValues

type SplitValues

TColStd_Array1OfInteger

rtype

None

property thisown¶: The membership flag

class Law_Composite(*args)¶

Bases: OCC.Core.Law.Law_Function

Construct an empty Law

rtype

None* Construct an empty, trimed Law

param First

type First

float

param Last

type Last

float

param Tol

type Tol

float

rtype

None

ChangeElementaryLaw()¶

Returns the elementary function of the composite used to compute at parameter W.

param W

type W

float

rtype

opencascade::handle<Law_Function>

ChangeLaws()¶

Return type: Law_Laws

static DownCast(t)¶

IsPeriodic()¶

Return type: bool

SetPeriodic()¶

Return type: None

property thisown¶: The membership flag

class Law_Constant(*args)¶

Bases: OCC.Core.Law.Law_Function

Return type: None

static DownCast(t)¶

Set()¶

Set the radius and the range of the constant Law.

param Radius

type Radius

float

param PFirst

type PFirst

float

param PLast

type PLast

float

rtype

None

property thisown¶: The membership flag

class Law_Function(*args, **kwargs)¶

Bases: OCC.Core.Standard.Standard_Transient

Empty constructor

Return type: None* Copy constructor – does nothing
Parameters: & (Standard_Transient) –
Return type: None

Bounds()¶

Returns the parametric bounds of the function.

param PFirst

type PFirst

float

param PLast

type PLast

float

rtype

void

Continuity()¶

Return type: GeomAbs_Shape

D1()¶

Returns the value F and the first derivative D of the function at the point of parameter X.

param X

type X

float

param F

type F

float

param D

type D

float

rtype

void

D2()¶

Returns the value, first and seconde derivatives at parameter X.

param X

type X

float

param F

type F

float

param D

type D

float

param D2

type D2

float

rtype

void

static DownCast(t)¶

Intervals()¶

Stores in <T> the parameters bounding the intervals of continuity <S>. //! The array must provide enough room to accomodate for the parameters. i.e. T.Length() > NbIntervals()

param T

type T

TColStd_Array1OfReal

param S

type S

GeomAbs_Shape

rtype

void

NbIntervals()¶

Returns the number of intervals for continuity <S>. May be one if Continuity(me) >= <S>

param S

type S

GeomAbs_Shape

rtype

int

Trim()¶

Returns a law equivalent of <self> between parameters <First> and <Last>. <Tol> is used to test for 3d points confusion. It is usfule to determines the derivatives in these values <First> and <Last> if the Law is not Cn.

param PFirst

type PFirst

float

param PLast

type PLast

float

param Tol

type Tol

float

rtype

opencascade::handle<Law_Function>

Value()¶

Returns the value of the function at the point of parameter X.

param X

type X

float

rtype

float

property thisown¶: The membership flag

class Law_Interpol(*args)¶

Bases: OCC.Core.Law.Law_BSpFunc

Constructs an empty interpolative evolution law. The function Set is used to define the law.

rtype

None

static DownCast(t)¶

Set()¶

Defines this evolution law by interpolating the set of 2D points ParAndRad. The Y coordinate of a point of ParAndRad is the value of the function at the parameter point given by its X coordinate. If Periodic is true, this function is assumed to be periodic. Warning - The X coordinates of points in the table ParAndRad must be given in ascendant order. - If Periodic is true, the first and last Y coordinates of points in the table ParAndRad are assumed to be equal. In addition, with the second syntax, Dd and Df are also assumed to be equal. If this is not the case, Set uses the first value(s) as last value(s).

param ParAndRad

type ParAndRad

TColgp_Array1OfPnt2d

param Periodic

default value is Standard_False

type Periodic

bool

rtype

None* Defines this evolution law by interpolating the set of 2D points ParAndRad. The Y coordinate of a point of ParAndRad is the value of the function at the parameter point given by its X coordinate. If Periodic is true, this function is assumed to be periodic. In the second syntax, Dd and Df define the values of the first derivative of the function at its first and last points. Warning - The X coordinates of points in the table ParAndRad must be given in ascendant order. - If Periodic is true, the first and last Y coordinates of points in the table ParAndRad are assumed to be equal. In addition, with the second syntax, Dd and Df are also assumed to be equal. If this is not the case, Set uses the first value(s) as last value(s).

param ParAndRad

type ParAndRad

TColgp_Array1OfPnt2d

param Dd

type Dd

float

param Df

type Df

float

param Periodic

default value is Standard_False

type Periodic

bool

rtype

None

SetInRelative()¶

Parameters

ParAndRad –

type ParAndRad: TColgp_Array1OfPnt2d
param Ud
type Ud: float
param Uf
type Uf: float
param Periodic: default value is Standard_False
type Periodic: bool
rtype: None:param ParAndRad:
type ParAndRad: TColgp_Array1OfPnt2d
param Ud
type Ud: float
param Uf
type Uf: float
param Dd
type Dd: float
param Df
type Df: float
param Periodic: default value is Standard_False
type Periodic: bool
rtype: None

property thisown¶: The membership flag

class Law_Interpolate(*args)¶

Bases: object

Tolerance is to check if the points are not too close to one an other. It is also used to check if the tangent vector is not too small. There should be at least 2 points. If PeriodicFlag is True then the curve will be periodic be periodic

param Points

type Points

TColStd_HArray1OfReal

param PeriodicFlag

type PeriodicFlag

bool

param Tolerance

type Tolerance

float

rtype

None* Tolerance is to check if the points are not too close to one an other. It is also used to check if the tangent vector is not too small. There should be at least 2 points. If PeriodicFlag is True then the curve will be periodic be periodic

param Points

type Points

TColStd_HArray1OfReal

param Parameters

type Parameters

TColStd_HArray1OfReal

param PeriodicFlag

type PeriodicFlag

bool

param Tolerance

type Tolerance

float

rtype

None

Curve()¶

Return type: opencascade::handle<Law_BSpline>

IsDone()¶

Return type: bool

Load()¶

loads initial and final tangents if any.

param InitialTangent

type InitialTangent

float

param FinalTangent

type FinalTangent

float

rtype

None* loads the tangents. We should have as many tangents as they are points in the array if TangentFlags.Value(i) is Standard_True use the tangent Tangents.Value(i) otherwise the tangent is not constrained.

param Tangents

type Tangents

TColStd_Array1OfReal

param TangentFlags

type TangentFlags

TColStd_HArray1OfBoolean

rtype

None

Perform()¶

Makes the interpolation

rtype

None

property thisown¶: The membership flag

class Law_Laws(*args)¶

Bases: object

Append()¶

Assign()¶

Clear()¶

First()¶

InsertAfter()¶

InsertBefore()¶

Last()¶

Prepend()¶

Remove()¶

RemoveFirst()¶

Reverse()¶

Set()¶

Size()¶

begin()¶

cbegin()¶

cend()¶

end()¶

property thisown¶: The membership flag

class Law_Linear(*args)¶

Bases: OCC.Core.Law.Law_Function

Constructs an empty linear evolution law.

rtype

None

static DownCast(t)¶

Set()¶

Defines this linear evolution law by assigning both: - the bounds Pdeb and Pfin of the parameter, and - the values Valdeb and Valfin of the function at these two parametric bounds.

param Pdeb

type Pdeb

float

param Valdeb

type Valdeb

float

param Pfin

type Pfin

float

param Valfin

type Valfin

float

rtype

None

property thisown¶: The membership flag

class Law_ListIteratorOfLaws(*args)¶

Bases: object

ChangeValue()¶

More()¶

Next()¶

Value()¶

property thisown¶: The membership flag

class Law_S(*args)¶

Bases: OCC.Core.Law.Law_BSpFunc

Constructs an empty ‘S’ evolution law.

rtype

None

static DownCast(t)¶

Set()¶

Defines this S evolution law by assigning both: - the bounds Pdeb and Pfin of the parameter, and - the values Valdeb and Valfin of the function at these two parametric bounds. The function is assumed to have the first derivatives equal to 0 at the two parameter points Pdeb and Pfin.

param Pdeb

type Pdeb

float

param Valdeb

type Valdeb

float

param Pfin

type Pfin

float

param Valfin

type Valfin

float

rtype

None* Defines this S evolution law by assigning - the bounds Pdeb and Pfin of the parameter, - the values Valdeb and Valfin of the function at these two parametric bounds, and - the values Ddeb and Dfin of the first derivative of the function at these two parametric bounds.

param Pdeb

type Pdeb

float

param Valdeb

type Valdeb

float

param Ddeb

type Ddeb

float

param Pfin

type Pfin

float

param Valfin

type Valfin

float

param Dfin

type Dfin

float

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()¶

class law¶

Bases: object

static MixBnd()¶

This algorithm searches the knot values corresponding to the splitting of a given B-spline law into several arcs with the same continuity. The continuity order is given at the construction time. Builds a 1d bspline that is near from Lin with null derivatives at the extremities.

param Lin

type Lin

Law_Linear

rtype

opencascade::handle<Law_BSpFunc>* Builds the poles of the 1d bspline that is near from Lin with null derivatives at the extremities.

param Degree

type Degree

int

param Knots

type Knots

TColStd_Array1OfReal

param Mults

type Mults

TColStd_Array1OfInteger

param Lin

type Lin

Law_Linear

rtype

opencascade::handle<TColStd_HArray1OfReal>

static MixTgt()¶

Builds the poles of the 1d bspline that is null on the rigth side of Knots(Index) (on the left if NulOnTheRight is false) and that is like a t*(1-t)(1-t) curve on the left side of Knots(Index) (on the rigth if NulOnTheRight is false). The result curve is C1 with a derivative equal to 1. at first parameter (-1 at last parameter if NulOnTheRight is false). Warning: Mults(Index) must greater or equal to degree-1.

param Degree

type Degree

int

param Knots

type Knots

TColStd_Array1OfReal

param Mults

type Mults

TColStd_Array1OfInteger

param NulOnTheRight

type NulOnTheRight

bool

param Index

type Index

int

rtype

opencascade::handle<TColStd_HArray1OfReal>

static Reparametrize()¶

Computes a 1 d curve to reparametrize a curve. Its an interpolation of NbPoints points calculated at quasi constant abscissa.

param Curve

type Curve

Adaptor3d_Curve

param First

type First

float

param Last

type Last

float

param HasDF

type HasDF

bool

param HasDL

type HasDL

bool

param DFirst

type DFirst

float

param DLast

type DLast

float

param Rev

type Rev

bool

param NbPoints

type NbPoints

int

rtype

opencascade::handle<Law_BSpline>

static Scale()¶

Computes a 1 d curve to scale a field of tangency. Value is 1. for t = (First+Last)/2 . If HasFirst value for t = First is VFirst (null derivative). If HasLast value for t = Last is VLast (null derivative). //! 1. _ _/ _ __/ __ / VFirst ____/ VLast ____ First Last

param First

type First

float

param Last

type Last

float

param HasF

type HasF

bool

param HasL

type HasL

bool

param VFirst

type VFirst

float

param VLast

type VLast

float

rtype

opencascade::handle<Law_BSpline>

static ScaleCub()¶

Parameters

First –

type First: float
param Last
type Last: float
param HasF
type HasF: bool
param HasL
type HasL: bool
param VFirst
type VFirst: float
param VLast
type VLast: float
rtype: opencascade::handle<Law_BSpline>

property thisown¶: The membership flag