HM_ExtAPI::CurveEllipseGetData()
Returns parameters that define ellipse.
Syntax
bool CurveEllipseGetData(
const HM_EntityGeometryCurve& curve,
HM_Point& center_point,
HM_Vector& unit_normal,
HM_Vector& major_axis,
double& ratio,
double& phase
);Type
HyperMesh Ext API
Description
The function expects that the type of curve object is HM_ExtAPI::ELLIPSE(). Application should call the function HM_ExtAPI::GeomCurveGetType() to verify the type before calling CurveEllipseGetData function.
The points on the curve of the ellipse can be calculated parametrically as
C(t) = C + P cos (t – φ) + α [n X P] sin (t - φ)
using parameters returned by the CurveEllipseGetData function as summarized in the table below.
| Parameters used by CurveEllipseGetData | Ellipse parameters |
|---|---|
| center_point | C |
| unit_normal | n |
| major_axis | P |
| ratio | α |
| phase | φ |
If the function succeeds, the return value is true. If the function fails, the return value is false. To get extended value information, call HM_ExtAPI::GetLastErrorCode().
Requires including hm_extapi.h.
Inputs
- curve
- [in] - Handle to curve object that was returned by previous calls to API functions.
- center_point
- [out] - Ellipse center point.
- unit_normal
- [out] - Unit length vector normal to the plane of the ellipse.
- major_axis
- [out] - Vector that defines direction of the major axis of the ellipse and has a length equal to major axis half length. This vector is normal to the vector unit_normal.
- ratio
- [out] - Ratio between the length of the minor ellipse axis and the major ellipse axis.
- phase
- [out] - Parameter value of the curve at the end of the major axis defined by major_axis.
Errors
None.