| | Describes a circle in the plane (2D space).
A circle is defined by its radius and positioned in the
plane with a coordinate system (a gp_Ax22d object) as follows:
- the origin of the coordinate system is the center of the circle, and
- the orientation (direct or indirect) of the coordinate
system gives an implicit orientation to the circle (and
defines its trigonometric sense).
This positioning coordinate system is the "local <br>
coordinate system" of the circle.
Note: when a gp_Circ2d circle is converted into a
Geom2d_Circle circle, some implicit properties of the
circle are used explicitly:
- the implicit orientation corresponds to the direction in
which parameter values increase,
- the starting point for parameterization is that of the "X <br>
Axis" of the local coordinate system (i.e. the "X Axis" of the circle).
See Also
GccAna and Geom2dGcc packages which provide
functions for constructing circles defined by geometric constraints
gce_MakeCirc2d which provides functions for more
complex circle constructions
Geom2d_Circle which provides additional functions for
constructing circles and works, with the parametric
equations of circles in particular gp_Ax22d
More...
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1.6.3