OCCCurve2d

OCCCurve2d(native_curve: Geom2d_Curve, name=None)

Class representing a general 2D curve object ussually generated through an embedding in a surface.

Parameters:

• name –

  The name of the curve.

Attributes:

• dimension (int) –

  The dimension of the curve is always 2.

• domain (tuple[float, float]) –

  The domain of the parameter space of the curve.

• end (Point) –

  The end point of the curve.

• is_closed (bool) –

  Flag indicating that the curve is closed.

• is_periodic (bool) –

  Flag indicating that the curve is periodic.

• start (Point) –

  The start point of the curve.

Functions

copy

copy() -> OCCCurve2d

Make an independent copy of the current curve.

Returns:

• OCCCurve2d –

curvature_at

curvature_at(t: float) -> Vector

Compute the curvature vector at a curve parameter.

Parameters:

• t (float) –

  The curve parameter.

Returns:

• Vector –

Raises:

• ValueError –

  If the parameter is not in the curve domain.

frame_at

frame_at(t: float) -> Frame

Compute the local frame at a curve parameter.

Parameters:

• t (float) –

  The curve parameter.

Returns:

• Frame –

Raises:

• ValueError –

  If the parameter is not in the curve domain.

from_native classmethod

from_native(native_curve: Geom2d_Curve) -> OCCCurve2d

Construct a NURBS curve from an existing OCC BSplineCurve.

Parameters:

• native_curve (Geom2d_Curve) –

  An OCC Geom2d_Curve object.

Returns:

• OCCCurve2d –

from_occ classmethod

from_occ(native_curve: Geom2d_Curve) -> OCCCurve2d

Construct a NURBS curve from an existing OCC BSplineCurve.

Parameters:

• native_curve (Geom2d_Curve) –

  An OCC Geom2d_Curve object.

Returns:

• OCCCurve2d –

Warnings

.. deprecated:: 1.3 Use from_native instead.

point_at

point_at(t: float) -> Point

Compute the point at a curve parameter.

Parameters:

• t (float) –

  The curve parameter.

Returns:

• Point –

Raises:

• ValueError –

  If the parameter is not in the curve domain.

tangent_at

tangent_at(t: float) -> Vector

Compute the tangent vector at a curve parameter.

Parameters:

• t (float) –

  The curve parameter.

Returns:

• Vector –

Raises:

• ValueError –

  If the parameter is not in the curve domain.

to_polyline

to_polyline(n: int = 100) -> Polyline

Convert the curve to a polyline.

Parameters:

• n (int, default: 100 ) –

  The number of polyline points.

Returns:

• Polyline –

to_step

to_step(filepath: str, schema: str = 'AP203') -> None

Write the curve geometry to a STP file.

Parameters:

• filepath (str) –

  The path to the file.

• schema (str, default: 'AP203' ) –

  The STEP schema to use.

Returns:

• None –