DG Kernel (ActiveX) Documentation


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IBoundary Interface

CoverEdge
GetCoverEdgeFlag
GetEdgeCount
GetEdgePosition
GetEdge

The IBoundary interface manages edges of the 3d surface. We call edge the geometrical edge of the surface at an end of the axial base of a Generic 3D Object with closed cross-section loop or geometrical edge of a Surface Of Revolution with open Profile Curve strip.  The software creates flat surface patches orthogonal to z axis to cover them, when an appropriate flag is set. This makes the object to appear solid. (See also Patch Strips and Surfaces ). Call GetEdgeCount  to find out whether the object has edges.

3D Debugger manages edges with Cover Edge check boxes on the General Page of the Options dialogue (Current Object > Options menu command ).

See also MiniCAD Sample, Interface List


HRESULT CoverEdge(int nEdge, bool bCover)

Parameters

nEdge - [in] Index of an Edge. Can be only 0  or 1.

bCover - [in] if true the object will have a flat patch covering correspondent end. 

Returns

S_OK in case of success.

DI_E_INVALIDGEOMETRY if the object does not have edges.

DISP_E_BADINDEX  if index is neither 0 nor 1.

Remarks

The methods turns on or off flat vertical patches covering correspondent frond or back side of the surface . Note that the method does not update the surface automatically. UpdateSurface() method of the control or Update method if IModel has to be called to display the surface correctly.

HRESULT GetCoverEdgeFlag(int nEdge, bool* pbCover)

Parameters

nEdge - [in] Index of an Edge. Can be only 0 or 1 

pbCover - [out] pointer to a Boolean variable which will be set to true if the end is currently covered.

Return Values

S_OK in case of success

DI_E_INVALIDGEOMETRY if the object does not have edges.

DISP_E_BADINDEX  if nEdge is neither 0 nor 1.


HRESULT GetEdgeCount(int* pnCount)

Parameters

pnCount- [out] pointer to variable which will receive number of edges in the object. In this release it is always either 0 or 2.

Return Values

S_OK in case of success

Remarks

In this product there is always either none or two edges. For generic 3D entities we call edge only closed cross-section segment loop at the first or the last axial knots. Entities with non closed cross-entityal segment strips in this interpretation do not have edges, so this method will set storage of pnCount to 0. In case of Surface of Revolution this number will be 0 if the generating 2D strip is closed and 2 otherwise.
 

HRESULT GetEdgePosition(int nEdge, double* pdCrossPosn)

Parameters

nEdge - [in] Index of an Edge. Can be only 0 or 1

pdCrossPosn - [out] pointer to a double variable which will be set to the first or the last knot position in case of generic 3D entities or to the first coordinate of correspondent end of Profile Curve.

Return Values

S_OK in case of success.

DI_E_INVALIDGEOMETRY if the object does not have edges.

DISP_E_BADINDEX  if nEdge is neither 0 nor 1.


HRESULT GetEdge(int nEdge, IStrip **ppIStrip)

Note: this method is provided for future development. In this product the method will return E_NOTIMPL error code.

Parameters

nEdge - [in] Index of an Edge. Can be only 0 for the edge at the first axial knot or 1 for the edge at the last axial knot.

ppIStrip- [out] pointer to variable which will receive pointer of IStrip interface representing corss-entityal 2D strip of the edge.

Return Values

S_OK in case of success
DI_E_INVALIDGEOMETRY if the object does not have edges.
DISP_E_BADINDEX  if nEdge not 0 nor 1.
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Remarks

No implementation in this release.