Defined in File Ifc4x2.h
IfcCircle: public Ifc4x2::IfcConic¶
Definition from ISO/CD 10303-42:1992: An IfcCircle is defined by a radius and the location and orientation of the circle. Interpretation of data should be as follows:
C = SELF\IfcConic.Position.Location x = SELF\IfcConic.Position.P y = SELF\IfcConic.Position.P z = SELF\IfcConic.Position.P R = Radius
and the circle is parameterized as
The parameterization range is 0 £ u £2p (or 0 £u £ 360 degree). In the placement coordinate system defined above, the circle is the equation C = 0, where
The positive sense of the circle at any point is in the tangent direction, T, to the curve at the point, where
NOTE Corresponding ISO 10303 entity: circle, please refer to ISO/IS 10303-42:1994, p. 38 for the final definition of the formal standard.
HISTORY New class in IFC Release 1.0
Figure 278 illustrates the definition of the IfcCircle within the (in this case three-dimensional) position coordinate system.
Figure 278 — Circle geometry
The radius of the circle, which shall be greater than zero.