API Documentation > Classes > Interface IpfcGeomCurve
Interface IpfcGeomCurve
Description
This class provides information for a geometry curve or edge.
Direct Parent Classes:
Direct Known Subclasses:
User Guide References:
Property Summary
Property
as Boolean
true if the geometry is visible and active, false if it is invisible and inactive. Inactive geometry may not have all geometric properties defined.
Method Summary
Function
Eval3DData (Param as Double) as IpfcCurveXYZData
Returns a IpfcCurveXYZData object with information on the point represented by input parameter t.
Function
EvalFromLength (StartParameter as Double, Length as Double) as IpfcCurveXYZData
Returns a CURVEXYZData object with information on the point that is a specified distance from the starting point as specified by input parameter t.
Function
EvalLength () as Double
Finds the length of the specified edge.
Function
EvalLengthBetween (Param1 as Double, Param2 as Double) as Double
Finds the length of the specified curve between two given parameters.
Function
EvalParameter (Point as IpfcPoint3D) as Double
Finds the corresponding normalized parameter on the curve, given the XYZ point.
Function
This method returns a data object containing the geometry of the edge or curve.
Function
Returns the feature which contains the geometry.
Function
This method returns the geometry of the edge or curve as a non-uniform rational B-spline curve.
Property Detail
Property
IsVisible
as Boolean
true if the geometry is visible and active, false if it is invisible and inactive. Inactive geometry may not have all geometric properties defined.
Method Detail
Function
Eval3DData
(Param as Double) as IpfcCurveXYZData
Returns a IpfcCurveXYZData object with information on the point represented by input parameter t.
If the curve is a composite curve,first derivative IpfcCurveXYZData.Derivative1 and second derivative IpfcCurveXYZData.Derivative2 are not accessible and will benull.
Exceptions thrown (but not limited to):
IpfcXToolkitNotImplemented - The argument p_curve represents a composite curve, while deriv1 or deriv2 is not NULL.
Parameters:
Param
The t parameter on the edge.
Returns:
The evaluation data, including the resulting point, the first and second derivatives, and the normal to the surface
User Guide References:
Function
EvalFromLength
(StartParameter as Double, Length as Double) as IpfcCurveXYZData
Returns a CURVEXYZData object with information on the point that is a specified distance from the starting point as specified by input parameter t.
Exceptions thrown (but not limited to):
IpfcXToolkitBadSrfCrv - The input argument is invalid.
Parameters:
StartParameter
The starting t parameter
Length
The distance from the starting parameter t to the resulting point
Returns:
The point at the specified distance from the starting parameter
User Guide References:
Function
EvalLength
() as Double
Finds the length of the specified edge.
Returns:
The edge length
User Guide References:
Function
EvalLengthBetween
(Param1 as Double, Param2 as Double) as Double
Finds the length of the specified curve between two given parameters.
Exceptions thrown (but not limited to):
IpfcXToolkitBadSrfCrv - The input argument is invalid.
Parameters:
Param1
The start t parameter
Param2
The end t parameter
Returns:
The curve length between the parameters.
User Guide References:
Function
EvalParameter
(Point as IpfcPoint3D) as Double
Finds the corresponding normalized parameter on the curve, given the XYZ point.
Parameters:
Point
The XYZ point. The point does not need to lie on the curve.If the point is not on the curve, the function finds the closest curve point.
Returns:
The t parameter that represents the input Point3D object.
User Guide References:
Function
GetCurveDescriptor
This method returns a data object containing the geometry of the edge or curve.
Exceptions thrown (but not limited to):
IpfcXToolkitInvalidType - The specified data is not a composite curve data structure.
Returns:
The edge or curve geometry
User Guide References:
Function
GetFeature
Returns the feature which contains the geometry.
Returns:
The feature.
Function
GetNURBSRepresentation
This method returns the geometry of the edge or curve as a non-uniform rational B-spline curve.
Returns:
The B-spline curve geometry
User Guide References:
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