Skip to content

BSpline2D

Canonical path: NemAll_Python_Geometry.BSpline2D

Bases: PolyPoints2D

class for 2D (non uniform, rational) B-spline geometry

Methods:

  • Clear –

    Clear data, getting invalid state

  • CreateLine2D –

    Create BSpline2D from Line2D

  • Get –

    Return type: tuple(list(Point2D), list(float), list(float), int, bool)

  • GetDegree –

    Gets spline degree

  • GetKnots –

    Get knot vector

  • GetWeights –

    Get control points weights

  • IsClosed –

    Check if spline is closed ( first/last points are equal )

  • IsRational –

    Check if the spline is rational

  • IsValid –

    Check spline validity

  • Reverse –

    Reverse of current spline

  • Set –

    Get/Set functions

  • SetDegree –

    Set spline degree

  • SetKnots –

    Set knot vector

  • SetPeriodic –

    Set the periodic flag

  • SetWeights –

    Set weights for control points

  • __eq__ –

    Comparison of bsplines without tolerance.

  • __init__ –

    dummy, is only needed for the creation of the documentation by MkDocs

  • __repr__ –

    Convert to string

Attributes:

Degree property writable 

Degree: int

Gets spline degree

IsPeriodic property writable 

IsPeriodic: bool

Check if the spline is periodic

Knots property writable 

Knots: VecDoubleList

Get knot vector

Weights property writable 

Weights: VecDoubleList

Get control points weights

Clear 

Clear()

Clear data, getting invalid state

CreateLine2D staticmethod 

CreateLine2D(line: Line2D) -> BSpline2D

Create BSpline2D from Line2D

Parameters:

  • line (Line2D) –

    Input line.

Returns:

Get 

Get() -> tuple[list[Point2D], list[float], list[float], int, bool]

Return type: tuple(list(Point2D), list(float), list(float), int, bool)

GetDegree 

GetDegree() -> int

Gets spline degree

Returns:

  • int –

    spline degree

GetKnots 

GetKnots() -> VecDoubleList

Get knot vector

Returns:

GetWeights 

GetWeights() -> VecDoubleList

Get control points weights

Returns:

IsClosed 

IsClosed() -> bool

Check if spline is closed ( first/last points are equal )

Returns:

  • bool –

    closed spline true/false

IsRational 

IsRational() -> bool

Check if the spline is rational

Returns:

  • bool –

    bool true = rational

IsValid 

IsValid() -> bool

Check spline validity

Returns:

  • bool –

    bool valid = true

Reverse 

Reverse()

Reverse of current spline

Method reverse Spline using reverse from PolyPoints and swapping tangents.

Set 

Set(
    points: Point2DList,
    weights: VecDoubleList,
    knots: VecDoubleList,
    degree: int,
    isPeriodic: bool,
)

Get/Set functions

SetDegree 

SetDegree(degree: int)

Set spline degree

Parameters:

  • degree (int) –

    desired degree

SetKnots 

SetKnots(knots: VecDoubleList)

Set knot vector

Parameters:

SetPeriodic 

SetPeriodic(arg2: bool)

Set the periodic flag

Parameters:

  • flag –

    True if BSpline is periodic

SetWeights 

SetWeights(weights: VecDoubleList)

Set weights for control points

Parameters:

__eq__ 

__eq__(bspline: BSpline2D) -> object

Comparison of bsplines without tolerance.

Be careful, this method work without tolerance!

Parameters:

Returns:

  • object –

    True when bsplines are equal, otherwise false.

__init__ overloaded 

__init__()

Initialize

__init__(
    points: Point2DList,
    weights: VecDoubleList,
    knots: VecDoubleList,
    degree: int,
    isPeriodic: bool,
)

Constructor from b-spline data. Creates b-spline using provided data.

Parameters:

  • points (Point2DList) –

    control points of b-spline.

  • weights (VecDoubleList) –

    weights of b-spline.

  • knots (VecDoubleList) –

    knots of b-spline.

  • degree (int) –

    degree of b-spline.

  • isPeriodic (bool) –

    flag of periodicity of b-spline.

__init__(spline: BSpline2D)

Copy constructor.

Parameters:

  • spline (BSpline2D) –

    Spline which will be copied.

__repr__ 

__repr__() -> str

Convert to string