B Spline2D

Class full path: NemAll_Python_Geometry.BSpline2D

Bases: PolyPoints2D

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

Attributes

Degree: int property writable

Gets spline degree

IsPeriodic: bool property writable

Check if the spline is periodic

Knots: VecDoubleList property writable

Get knot vector

Weights: VecDoubleList property writable

Get control points weights

Functions

Clear()

Clear data, getting invalid state

CreateLine2D(line) staticmethod

Create BSpline2D from Line2D

Parameters:

Name	Type	Description	Default
line	Line2D	Input line.	required

Returns:

Type	Description
BSpline2D	Created BSpline2D.

Get()

Gets the BSpline2D

Returns:

Type	Description
List[Point2D]	list of points
List[float]	list of weights
List[float]	list of knots
int	spline degree
bool	True if spline is periodic, False otherwise

GetDegree()

Gets spline degree

Returns:

Type	Description
int	spline degree

GetKnots()

Get knot vector

Returns:

Type	Description
VecDoubleList	knot vector const reference

GetWeights()

Get control points weights

Returns:

Type	Description
VecDoubleList	weights vector const reference

IsClosed()

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

Returns:

Type	Description
bool	closed spline true/false

IsRational()

Check if the spline is rational

Returns:

Type	Description
bool	bool true = rational

IsValid()

Check spline validity

Returns:

Type	Description
bool	bool valid = true

Reverse()

Reverse of current spline

Method reverse Spline using reverse from PolyPoints and swapping tangents.

Set(points, weights, knots, degree, isPeriodic)

Get/Set functions

Parameters:

Name	Type	Description	Default
points	Point2DList	spline points	required
weights	VecDoubleList	vector with spline weights	required
knots	VecDoubleList	vector with spline knots	required
degree	int	spline degree	required
isPeriodic	bool	Whether the spline is to be periodic	required

SetDegree(degree)

Set spline degree

Parameters:

Name	Type	Description	Default
degree	int	desired degree	required

SetKnots(knots)

Set knot vector

Parameters:

Name	Type	Description	Default
knots	VecDoubleList	knot vector to set	required

SetPeriodic(flag)

Set the periodic flag

Parameters:

Name	Type	Description	Default
flag	bool	True if BSpline is periodic	required

SetWeights(weights)

Set weights for control points

Parameters:

Name	Type	Description	Default
weights	VecDoubleList	weights vector to set	required

__eq__(bspline)

Comparison of bsplines without tolerance.

Be careful, this method work without tolerance!

Parameters:

Name	Type	Description	Default
bspline	BSpline2D	Compared bspline.	required

Returns:

Type	Description
object	True when bsplines are equal, otherwise false.

__init__ overload

__init__()

initialize

__init__(points, weights, knots, degree, isPeriodic)

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

Parameters:

Name	Type	Description	Default
points	Point2DList	control points of b-spline.	required
weights	VecDoubleList	weights of b-spline.	required
knots	VecDoubleList	knots of b-spline.	required
degree	int	degree of b-spline.	required
isPeriodic	bool	flag of periodicity of b-spline.	required

__init__(spline)

Copy constructor.

Parameters:

Name	Type	Description	Default
spline	BSpline2D	Spline which will be copied.	required

__repr__()

Convert to string