OpenCascade.jsAPI ReferenceFoundationClassesTKMath
BSplCLib
OCCT package BSplCLib: BSplCLib_Cache, BSplCLib_EvaluatorFunction, BSplCLib_KnotDistribution, BSplCLib_MultDistribution.
BSplCLib_Cache
A cache class for Bezier and B-spline curves.
Defines all data, that can be cached on a span of a curve. The data should be recalculated in going from span to span.
Constructors(2)
- constructor(theDegree: number, thePeriodic: boolean, theFlatKnots: NCollection_Array1_double, thePoles2d: NCollection_Array1_gp_Pnt2d, theWeights?: NCollection_Array1_double): BSplCLib_Cache
Constructor, prepares data structures for caching values on a 2d curve.
Parameters (5)theDegree—degree of the curvethePeriodic—identify whether the curve is periodictheFlatKnots—knots of Bezier/B-spline curve (with repetitions)thePoles2d—array of poles of 2D curvetheWeights—array of weights of corresponding poles
- constructor(theDegree: number, thePeriodic: boolean, theFlatKnots: NCollection_Array1_double, thePoles: NCollection_Array1_gp_Pnt, theWeights?: NCollection_Array1_double): BSplCLib_Cache
Constructor, prepares data structures for caching values on a 3d curve.
Parameters (5)theDegree—degree of the curvethePeriodic—identify whether the curve is periodictheFlatKnots—knots of Bezier/B-spline curve (with repetitions)thePoles—array of poles of 3D curvetheWeights—array of weights of corresponding poles
Static methods(2)
- get_type_name(): string
Instance methods(20)
- IsCacheValid(theParameter: number): boolean
Verifies validity of the cache using flat parameter of the point.
Parameters (1)theParameter—parameter of the point placed in the span
- BuildCache(theParameter: number, theFlatKnots: NCollection_Array1_double, thePoles2d: NCollection_Array1_gp_Pnt2d, theWeights: NCollection_Array1_double): void
Recomputes the cache data for 2D curves. Does not verify validity of the cache.
Parameters (4)theParameter—the value on the knot's axis to identify the spantheFlatKnots—knots of Bezier/B-spline curve (with repetitions)thePoles2d—array of poles of 2D curvetheWeights—array of weights of corresponding poles
- BuildCache(theParameter: number, theFlatKnots: NCollection_Array1_double, thePoles: NCollection_Array1_gp_Pnt, theWeights: NCollection_Array1_double): void
Recomputes the cache data for 3D curves. Does not verify validity of the cache.
Parameters (4)theParameter—the value on the knot's axis to identify the spantheFlatKnots—knots of Bezier/B-spline curve (with repetitions)thePoles—array of poles of 3D curvetheWeights—array of weights of corresponding poles
Calculates the point on the curve in the specified parameter.
Parameters (2)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.
Calculates the point on the curve in the specified parameter.
Parameters (2)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.
Calculates the point on the curve and its first derivative in the specified parameter.
Parameters (3)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.theTangent—tangent vector (first derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.
Calculates the point on the curve and its first derivative in the specified parameter.
Parameters (3)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.theTangent—tangent vector (first derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.
Calculates the point on the curve and two derivatives in the specified parameter.
Parameters (4)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.theTangent—tangent vector (1st derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.theCurvature—curvature vector (2nd derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.
Calculates the point on the curve and two derivatives in the specified parameter.
Parameters (4)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.theTangent—tangent vector (1st derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.theCurvature—curvature vector (2nd derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.
- D3(theParameter: number, thePoint: gp_Pnt2d, theTangent: gp_Vec2d, theCurvature: gp_Vec2d, theTorsion: gp_Vec2d): void
Calculates the point on the curve and three derivatives in the specified parameter.
Parameters (5)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.theTangent—tangent vector (1st derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.theCurvature—curvature vector (2nd derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.theTorsion—second curvature vector (3rd derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.
- D3(theParameter: number, thePoint: gp_Pnt, theTangent: gp_Vec, theCurvature: gp_Vec, theTorsion: gp_Vec): void
Calculates the point on the curve and three derivatives in the specified parameter.
Parameters (5)theParameter—parameter of calculation of the valuethePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.theTangent—tangent vector (1st derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.theCurvature—curvature vector (2nd derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.theTorsion—second curvature vector (3rd derivatives) for the curve in the calculated point Mutated in place; read the updated value from this argument after the call.
Calculates the 3D point using pre-computed local parameter in [0, 1] range. This bypasses periodic normalization and local parameter calculation.
Parameters (2)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.
Calculates the 2D point using pre-computed local parameter in [0, 1] range. This bypasses periodic normalization and local parameter calculation.
Parameters (2)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the result of calculation (the point on the curve) Mutated in place; read the updated value from this argument after the call.
Calculates the 3D point and first derivative using pre-computed local parameter.
Parameters (3)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the point on the curve Mutated in place; read the updated value from this argument after the call.theTangent—first derivative (tangent vector) Mutated in place; read the updated value from this argument after the call.
Calculates the 2D point and first derivative using pre-computed local parameter.
Parameters (3)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the point on the curve Mutated in place; read the updated value from this argument after the call.theTangent—first derivative (tangent vector) Mutated in place; read the updated value from this argument after the call.
Calculates the 3D point, first and second derivatives using pre-computed local parameter.
Parameters (4)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the point on the curve Mutated in place; read the updated value from this argument after the call.theTangent—first derivative (tangent vector) Mutated in place; read the updated value from this argument after the call.theCurvature—second derivative (curvature vector) Mutated in place; read the updated value from this argument after the call.
- D2Local(theLocalParam: number, thePoint: gp_Pnt2d, theTangent: gp_Vec2d, theCurvature: gp_Vec2d): void
Calculates the 2D point, first and second derivatives using pre-computed local parameter.
Parameters (4)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the point on the curve Mutated in place; read the updated value from this argument after the call.theTangent—first derivative (tangent vector) Mutated in place; read the updated value from this argument after the call.theCurvature—second derivative (curvature vector) Mutated in place; read the updated value from this argument after the call.
- D3Local(theLocalParam: number, thePoint: gp_Pnt, theTangent: gp_Vec, theCurvature: gp_Vec, theTorsion: gp_Vec): void
Calculates the 3D point, first, second and third derivatives using pre-computed local parameter.
Parameters (5)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the point on the curve Mutated in place; read the updated value from this argument after the call.theTangent—first derivative (tangent vector) Mutated in place; read the updated value from this argument after the call.theCurvature—second derivative (curvature vector) Mutated in place; read the updated value from this argument after the call.theTorsion—third derivative (torsion vector) Mutated in place; read the updated value from this argument after the call.
- D3Local(theLocalParam: number, thePoint: gp_Pnt2d, theTangent: gp_Vec2d, theCurvature: gp_Vec2d, theTorsion: gp_Vec2d): void
Calculates the 2D point, first, second and third derivatives using pre-computed local parameter.
Parameters (5)theLocalParam—pre-computed local parameter: (Param - SpanStart) / SpanLengththePoint—the point on the curve Mutated in place; read the updated value from this argument after the call.theTangent—first derivative (tangent vector) Mutated in place; read the updated value from this argument after the call.theCurvature—second derivative (curvature vector) Mutated in place; read the updated value from this argument after the call.theTorsion—third derivative (torsion vector) Mutated in place; read the updated value from this argument after the call.
BSplCLib_EvaluatorFunction
Instance methods(1)
- Evaluate(theDerivativeRequest: number, theStartEnd: number, theParameter: number, theResult: number, theErrorCode: number): { theResult: number; theErrorCode: number }
Function evaluation method to be defined by descendant.
Parameters (5)theDerivativeRequesttheStartEndtheParametertheResulttheErrorCode
ReturnsA result object with fields:
theResult: updated value from the call.theErrorCode: updated value from the call.