Data Structures | |
struct | A3DCrvEllipseData |
Elliptic curve structure. | |
Functions | |
A3DStatus | A3DCrvEllipseGet (const A3DCrvEllipse *pCrv, A3DCrvEllipseData *pData) |
Populates the A3DCrvEllipseData structure. More... | |
A3DStatus | A3DCrvEllipseCreate (const A3DCrvEllipseData *pData, A3DCrvEllipse **ppCrv) |
Creates an A3DCrvEllipse from A3DCrvEllipseData structure. More... | |
Entity type is kA3DTypeCrvEllipse.
The canonical form is defined with an A3DMiscCartesianTransformationData, its origin being the center of the ellipse and its vector X being the axis corresponding to zero parameter and X radius. The implicit parameterization is an angle in radian in the range [0, 2PI].
A3DParameterizationData allows for reparameterization and trim.
In this example, the ellipse is in the XY plane (and therefore has an identity transformation), with radii Rx and Ry and is restricted to the [ t0 , t1 ] interval. Assuming m_dCoeffA
is 1.0 and m_dCoeffB
0.0 (which indicates a parameterization in radians), then t0=0 and t1=PI/2, t0 corresponds to the Cartesian coordinates (Rx,0,0) and t1 to (0,Ry,0).
m_dXRadius
and m_dYRadius
members must be greater than 0.