NurbsCurve

class compas.geometry.NurbsCurve(*args, **kwargs)[source]

Class representing a NURBS curve.

Attributes

points (List[Point]) – The control points of the curve.
weights (List[float]) – The weights of the control points.
knots (List[float]) – The knot vector, without duplicates.
multiplicities (List[int]) – The multiplicities of the knots in the knot vector.
knotsequence (List[float]) – The knot vector, with repeating values according to the multiplicities.
degree (int) – The degree of the polynomials.
order (int) – The order of the curve.
domain (Tuple[float, float]) – The parameter domain.
start (Point) – The point corresponding to the start of the parameter domain.
end (Point) – The point corresponding to the end of the parameter domain.
is_closed (bool) – True if the curve is closed.
is_periodic (bool) – True if the curve is periodic.
is_rational (bool) – True is the curve is rational.
length (float) – Length of the curve.

Attributes

`DATASCHEMA`	The schema of the data of this object.
`JSONSCHEMANAME`
`bounding_box`
`data`	The representation of the object as native Python data.
`degree`
`dimension`
`domain`
`dtype`	The type of the object in the form of a '2-level' import and a class name.
`end`
`is_closed`
`is_periodic`
`is_rational`
`knots`
`knotsequence`
`length`
`multiplicities`
`order`
`points`
`start`
`weights`

Inherited Attributes

`JSONSCHEMA`	The schema of the JSON representation of the data of this object.
`guid`	The globally unique identifier of the object.
`jsondefinitions`	Reusable schema definitions.
`jsonstring`	The representation of the object data in JSON format.
`jsonvalidator`	JSON schema validator for draft 7.
`name`	The name of the object.

Methods

`closest_point`	Compute the closest point on the curve to a given point.
`copy`	Make an independent copy of the current curve.
`curvature_at`	Compute the curvature at a point on the curve.
`divide_by_count`	Divide the curve into a specific number of equal length segments.
`divide_by_length`	Divide the curve into segments of specified length.
`fair`
`frame_at`	Compute the local frame at a point on the curve.
`from_arc`
`from_circle`	Construct a NURBS curve from a circle.
`from_data`	Construct a NURBS curve from its data representation.
`from_ellipse`	Construct a NURBS curve from an ellipse.
`from_interpolation`	Construct a NURBS curve by interpolating a set of points.
`from_line`	Construct a NURBS curve from a line.
`from_parameters`	Construct a NURBS curve from explicit curve parameters.
`from_points`	Construct a NURBS curve from control points.
`from_step`	Load a NURBS curve from an STP file.
`locus`	Compute the locus of all points on the curve.
`point_at`	Compute a point on the curve.
`space`	Compute evenly spaced parameters over the curve domain.
`tangent_at`	Compute the tangent vector at a point on the curve.
`to_step`	Write the curve geometry to a STP file.
`transform`	Transform this curve.
`transformed`	Transform a copy of the curve.
`xyz`	Compute point locations corresponding to evenly spaced parameters over the curve domain.

Inherited Methods

`from_json`	Construct an object from serialized data contained in a JSON file.
`from_jsonstring`	Construct an object from serialized data contained in a JSON string.
`to_data`	Convert an object to its native data representation.
`to_json`	Serialize the data representation of an object to a JSON file.
`to_jsonstring`	Serialize the data representation of an object to a JSON string.
`validate_data`	Validate the object's data against its data schema (self.DATASCHEMA).
`validate_json`	Validate the object's data against its json schema (self.JSONSCHEMA).