Circle (Curve)
==============

Funcitonality
-------------

This node generates a Curve object, which represents a circle, or an arc of the circle.

Specifics of curve parametrization: the T parameter is proportional to curve
length, and equals to the angle along the circle arc.

Curve domain: defined in node's inputs, by default from 0 to 2*pi.

Behavior when trying to evaluate curve outside of it's boundaries: returns
corresponding point on the circle.

Inputs
------

This node has the following inputs:

* **Center**. A matrix defining the location of the circle. This may be used to
  move, scale or rotate the curve. By default, the center of matrix is at the
  origin, and the circle is laying in the XOY plane.
* **Radius**. Circle radius. The default value is 1.0.
* **T Min**. Minimum value of the curve parameter. The default value is 0.0.
* **T Max**. Maximum value of the curve parameter. The default value is 2*pi (radians).

Parameters
----------

This node has the following parameter:

* **Angle Units**. The units in which values of **T Min**, **T Max** inputs are measured. The available options are:

  * **Rad**. Radians (2*pi is full circle).
  * **Deg**. Degrees (360 is full circle).
  * **Uni**. Unit circles (1.0 is full circle).

  The default value is **Rad**.

* **Output NURBS**. Outputs a NURBS curve.

  The default is False.

Outputs
-------

This node has one output:

* **Curve**. The circle (or arc) curve.

Examples of usage
-----------------

Simple use:

.. image:: https://user-images.githubusercontent.com/284644/77347101-27794f80-6d59-11ea-9bcd-182c918222cc.png

Use together with Extrude node to create a surafce:

.. image:: https://user-images.githubusercontent.com/284644/77347798-344a7300-6d5a-11ea-88c2-e25e12be74b9.png
