The Angle handle is a directed arrow radiating from an origin.
Together, this defines an orientation.  The orientation is provided to
the parms in terms of Euler rotations, as opposed to the Vector handle
which provides it in axis-angle notation.

Parameters:

    input       - A group field.  The centroid of this group is used
                  as the default origin.
    onoff       - Whether the handle is enabled, 1 means enable.
    px, py, pz  - The pivot of the transformation described by the handle.
    rx, ry, rz  - The angles required to rotate into the handle's
                  space.  These are in degrees and are provided
                  according to the xyz_order.
    scale       - A global scale defined by the handle.  This is
                  defined by dragging the red tip of the handle arrow.
    trs_order   - The transform/rotate/scale order, defined as in the
                  transformation operations.  This will govern how the
                  handle breaks its orientation down into r,p,t
                  components.
    tx, ty, tz  - The translate component of the orientation.
    xyz_order   - The order in which rx, ry, and rz must be applied.

See Also: Transform, Vector
