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 –

  Get the b-spline data.

• 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 –

  Set the b-spline data.

• SetDegree –

  Set spline degree

• SetKnots –

  Set knot vector

• SetPeriodic –

  Set the periodic flag

• SetWeights –

  Set weights for control points

• __eq__ –

  Comparison of bsplines.

• __init__ –

  Overloaded function. See individual overloads.

• __repr__ –

  Convert to string

Attributes:

• Degree (int) –

  Gets spline degree

• IsPeriodic (bool) –

  Check if the spline is periodic

• Knots (VecDoubleList) –

  Get knot vector

• Weights (VecDoubleList) –

  Get control points weights

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:

• BSpline2D –

  Created BSpline2D.

Get

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

Get the b-spline data.

Returns:

• tuple[list[Point2D], list[float], list[float], int, bool] –

  tuple(control points of b-spline, weights of b-spline, knots of b-spline, degree of b-spline, flag of periodicity of b-spline)

GetDegree

GetDegree() -> int

Gets spline degree

Returns:

• int –

  spline degree

GetKnots

GetKnots() -> VecDoubleList

Get knot vector

Returns:

• VecDoubleList –

  knot vector const reference

GetWeights

GetWeights() -> VecDoubleList

Get control points weights

Returns:

• VecDoubleList –

  weights vector const reference

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,
)

Set the b-spline 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.

SetDegree

SetDegree(degree: int)

Set spline degree

Parameters:

• degree (int) –

  desired degree

SetKnots

SetKnots(knots: VecDoubleList)

Set knot vector

Parameters:

• knots (VecDoubleList) –

  knot vector to set

SetPeriodic

SetPeriodic(flag: bool)

Set the periodic flag

Parameters:

• flag (bool) –

  True if BSpline is periodic

SetWeights

SetWeights(weights: VecDoubleList)

Set weights for control points

Parameters:

• weights (VecDoubleList) –

  weights vector to set

__eq__

__eq__(bspline: BSpline2D) -> bool

Comparison of bsplines.

Be careful, this method work without tolerance!

Parameters:

• bspline (BSpline2D) –

  bspline to be compared.

Returns:

• bool –

  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

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