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Helix
=====
.. module:: ezdxf.entities
:noindex:
The HELIX entity (`DXF Reference`_).
The helix curve is represented by a cubic B-spline curve, therefore the HELIX
entity is also derived from the SPLINE entity.
.. seealso::
- `Wikipedia`_ article about the helix shape
======================== ==========================================
Subclass of :class:`ezdxf.entities.Spline`
DXF type ``'HELIX'``
Factory function :meth:`ezdxf.layouts.BaseLayout.add_helix`
Inherited DXF attributes :ref:`Common graphical DXF attributes`
Required DXF version DXF R2000 (``'AC1015'``)
======================== ==========================================
.. _DXF Reference: https://help.autodesk.com/view/OARX/2018/ENU/?guid=GUID-76DB3ABF-3C8C-47D1-8AFB-72942D9AE1FF
.. class:: Helix
All points in :ref:`WCS` as (x, y, z) tuples
.. attribute:: dxf.axis_base_point
The base point of the helix axis (Vec3).
.. attribute:: dxf.start_point
The starting point of the helix curve (Vec3).
This also defines the base radius as the distance from the start point
to the axis base point.
.. attribute:: dxf.axis_vector
Defines the direction of the helix axis (Vec3).
.. attribute:: dxf.radius
Defines the top radius of the helix (float).
.. attribute:: dxf.turn_height
Defines the pitch (height if one helix turn) of the helix (float).
.. attribute:: dxf.turns
The count of helix turns (float).
.. attribute:: dxf.handedness
Helix orientation (int).
=== ================================
0 clock wise (left handed)
1 counter clockwise (right handed)
=== ================================
.. attribute:: dxf.constrain
=== =========================
0 constrain turn height (pitch)
1 constrain count of turns
2 constrain total height
=== =========================
.. _Wikipedia: https://en.wikipedia.org/wiki/Helix
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