IfcCircle

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[1]

y = SELF\IfcConic.Position.P[2]

z = SELF\IfcConic.Position.P[3]

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 A circular arc is defined by using the trimmed curve (IfcTrimmedCurve) entity in conjunction with the circle (IfcCircle) entity as the BasisCurve.

NOTE Corresponding STEP 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

Illustration:

Definition of the IfcCircle within the (in this case three-dimensional) position coordinate system.

EXPRESS specification:

Attribute definitions:

Inheritance graph