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Public Member Functions
IGESGeom_BSplineCurve Class Reference

defines IGESBSplineCurve, Type <126> Form <0-5>
in package IGESGeom
A parametric equation obtained by dividing two summations
involving weights (which are real numbers), the control
points, and B-Spline basis functions

#include <IGESGeom_BSplineCurve.hxx>

Inheritance diagram for IGESGeom_BSplineCurve:
Inheritance graph
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Public Member Functions

 IGESGeom_BSplineCurve ()
void Init (const Standard_Integer anIndex, const Standard_Integer aDegree, const Standard_Boolean aPlanar, const Standard_Boolean aClosed, const Standard_Boolean aPolynom, const Standard_Boolean aPeriodic, const Handle< TColStd_HArray1OfReal > &allKnots, const Handle< TColStd_HArray1OfReal > &allWeights, const Handle< TColgp_HArray1OfXYZ > &allPoles, const Standard_Real aUmin, const Standard_Real aUmax, const gp_XYZ &aNorm)
 This method is used to set the fields of the class
BSplineCurve. Beware about indexation of arrays

void SetFormNumber (const Standard_Integer form)
 Changes FormNumber (indicates the Shape of the Curve)
Error if not in range [0-5]

Standard_Integer UpperIndex () const
 returns the upper index of the sum (see Knots,Poles)

Standard_Integer Degree () const
 returns the degree of basis functions

Standard_Boolean IsPlanar () const
 returns True if the curve is Planar, False if non-planar

Standard_Boolean IsClosed () const
 returns True if the curve is closed, False if open

Standard_Boolean IsPolynomial (const Standard_Boolean flag=Standard_False) const
 returns True if the curve is polynomial, False if rational
<flag> False (D) : computed from the list of weights
(all must be equal)
<flag> True : as recorded

Standard_Boolean IsPeriodic () const
 returns True if the curve is periodic, False otherwise

Standard_Integer NbKnots () const
 returns the number of knots (i.e. Degree + UpperIndex + 2)

Standard_Real Knot (const Standard_Integer anIndex) const
 returns the knot referred to by anIndex,
inside the range [-Degree,UpperIndex+1]
raises exception if
anIndex < -Degree() or anIndex > (NbKnots() - Degree())
Note : Knots are numbered from -Degree (not from 1)

Standard_Integer NbPoles () const
 returns number of poles (i.e. UpperIndex + 1)

Standard_Real Weight (const Standard_Integer anIndex) const
 returns the weight referred to by anIndex, in [0,UpperIndex]
raises exception if anIndex < 0 or anIndex > UpperIndex()

gp_Pnt Pole (const Standard_Integer anIndex) const
 returns the pole referred to by anIndex, in [0,UpperIndex]
raises exception if anIndex < 0 or anIndex > UpperIndex()

gp_Pnt TransformedPole (const Standard_Integer anIndex) const
 returns the anIndex'th pole after applying Transf. Matrix
raises exception if an Index < 0 or an Index > UpperIndex()

Standard_Real UMin () const
 returns starting parameter value

Standard_Real UMax () const
 returns ending parameter value

gp_XYZ Normal () const
 if the curve is nonplanar then (0, 0, 0) is returned


Constructor & Destructor Documentation


Member Function Documentation

  - anIndex      : Upper index of the sum <br>
  - aDegree      : Degree of basis functions <br>
  - aPlanar      : 0 = nonplanar curve, 1 = planar curve <br>
  - aClosed      : 0 = open curve, 1 = closed curve <br>
  - aPolynom     : 0 = rational, 1 = polynomial <br>
  - aPeriodic    : 0 = nonperiodic, 1 = periodic <br>
  - allKnots     : Knot sequence values [-Degree,Index+1] <br>
  - allWeights   : Array of weights     [0,Index] <br>
  - allPoles     : X, Y, Z coordinates of all control points <br>
                                        [0,Index] <br>
  - aUmin, aUmax : Starting and ending parameter values <br>
  - aNorm        : Unit normal (if the curve is planar) <br>

raises exception if allWeights & allPoles are not of same size.


The documentation for this class was generated from the following file: