EndPoint class

The end point to trim the curve, can be a parameter value or a Cartesian point.

The EndPoint type exposes the following members:

Constructor	Description
`__init__(self, point)`	Construct a `EndPoint` from a Cartesian point.
`__init__(self, v)`	Construct a `EndPoint` from a real parameter.
`__init__(self)`	Constructs a new instance of EndPoint

Property	Description
is_cartesian_point	Is the end point a Cartesian point?
as_point	Gets the end point as Cartesian point, or thrown an exception.
as_value	Gets the end point as a real parameter, or throw an exception.

Method	Description
`from_degree(, degree)`	Create an end point measured in degree.
`from_radian(, degree)`	Create an end point measured in radian.