API Reference > geometry-core > Bspline > AkimaCurve3d AkimaCurve3d Class Interpolating curve. Derive from ProxyCurve Use a BSplineCurve3d as the proxy Extends ProxyCurve Methods Name Description clone(): undefined | GeometryQuery Return a clone. cloneProps(): AkimaCurve3dProps Clone the AkimaCurve3dProps object in this AkimaCurve3dProps cloneTransformed(transform: Transform): undefined | GeometryQuery Return a transformed clone. copyFitPointsFloat64Array(): Float64Array Return a (copy of) the defining points, packed as a Float64Array dispatchToGeometryHandler(handler: GeometryHandler): any * "double dispatch" call pattern. isAlmostEqual(other: GeometryQuery): boolean test for exact structure and nearly identical geometry. isSameGeometryClass(other: GeometryQuery): boolean Test if other is also an AkimaCurve3d reverseInPlace(): void Reverse the curve direction. toJSON(): any Return json key-value pairs for for this AkimaCurve3d. tryTransformInPlace(transform: Transform): boolean Transform this AkimaCurve3d and its defining data in place create(options: AkimaCurve3dProps | AkimaCurve3dOptions): undefined | AkimaCurve3d Static Create an AkimaCurve3d based on points, knots, and other properties in the AkimaCurve3dProps or AkimaCurve3dOptions. createCapture(options: AkimaCurve3dOptions): undefined | AkimaCurve3d Static Inherited methods Name Inherited from Description addMappedStrokesToLineString3D(map: StrokeCountMap, linestring: LineString3d): number ProxyCurve * evaluate strokes at fractions indicated in a StrokeCountMap. announceClipIntervals(_clipper: Clipper, _announce?: AnnounceNumberNumberCurvePrimitive): boolean ProxyCurve Find intervals of this curvePrimitive that are interior to a clipper appendPlaneIntersectionPoints(plane: PlaneAltitudeEvaluator, result: CurveLocationDetail[]): number ProxyCurve Compute intersections with a plane. clonePartialCurve(_fractionA: number, _fractionB: number): undefined | CurvePrimitive ProxyCurve Return (if possible) a curve primitive which is a portion of this curve. closestPoint(spacePoint: Point3d, extend: VariantCurveExtendParameter): undefined | CurveLocationDetail ProxyCurve Search for the curve point that is closest to the spacePoint. collectCurvePrimitives(collectorArray?: CurvePrimitive[], smallestPossiblePrimitives: boolean = false, explodeLinestrings: boolean = false): CurvePrimitive[] ProxyCurve Return an array containing only the curve primitives. collectCurvePrimitivesGo(collectorArray: CurvePrimitive[], _smallestPossiblePrimitives: boolean, _explodeLinestrings: boolean = false): void ProxyCurve Return an array containing only the curve primitives. computeAndAttachRecursiveStrokeCounts(options?: StrokeOptions, parentMap?: StrokeCountMap): void ProxyCurve attach StrokeCountMap structure to this primitive (and recursively to any children) computeStrokeCountForOptions(options?: StrokeOptions): number ProxyCurve Implement by proxyCurve curveLength(): number ProxyCurve return the length of the curve. curveLengthBetweenFractions(fraction0: number, fraction1: number): number ProxyCurve Returns a (high accuracy) length of the curve between fractional positions curveLengthWithFixedIntervalCountQuadrature(fraction0: number, fraction1: number, numInterval: number, numGauss: number = 5): number ProxyCurve * Run an integration (with a default gaussian quadrature) with a fixed fractional step emitStrokableParts(dest: IStrokeHandler, options?: StrokeOptions): void ProxyCurve Implement by proxyCurve emitStrokes(dest: LineString3d, options?: StrokeOptions): void ProxyCurve Implement by proxyCurve endPoint(result?: Point3d): Point3d ProxyCurve return the end point of the primitive. extendRange(rangeToExtend: Range3d, transform?: Transform): void ProxyCurve Implement by proxyCurve fractionAndDistanceToPointOnTangent(fraction: number, distance: number): Point3d ProxyCurve Construct a point extrapolated along tangent at fraction. fractionToCurvature(fraction: number): undefined | number ProxyCurve Returns the (absolute) curvature magnitude. fractionToFrenetFrame(fraction: number, result?: Transform): undefined | Transform ProxyCurve Construct a frenet frame: fractionToPoint(fraction: number, result?: Point3d): Point3d ProxyCurve Implement by proxyCurve fractionToPointAnd2Derivatives(fraction: number, result?: Plane3dByOriginAndVectors): undefined | Plane3dByOriginAndVectors ProxyCurve Implement by proxyCurve fractionToPointAndDerivative(fraction: number, result?: Ray3d): Ray3d ProxyCurve Implement by proxyCurve fractionToPointAndUnitTangent(fraction: number, result?: Ray3d): Ray3d ProxyCurve Returns a ray whose origin is the curve point and direction is the unit tangent. getFractionToDistanceScale(): undefined | number ProxyCurve * If the curve primitive has distance-along-curve strictly proportional to curve fraction, return true isInPlane(plane: Plane3dByOriginAndUnitNormal): boolean ProxyCurve Implement by proxyCurve moveSignedDistanceFromFraction(startFraction: number, signedDistance: number, allowExtension: boolean, result?: CurveLocationDetail): CurveLocationDetail ProxyCurve * (Attempt to) find a position on the curve at a signed distance from start fraction. moveSignedDistanceFromFractionGeneric(startFraction: number, signedDistance: number, allowExtension: boolean, result?: CurveLocationDetail): CurveLocationDetail Protected ProxyCurve Generic algorithm to search for point at signed distance from a fractional startPoint. quickLength(): number ProxyCurve Compute a length which may be an fast approximation to the true length. range(transform?: Transform, result?: Range3d): Range3d ProxyCurve Implement by proxyCurve startPoint(result?: Point3d): Point3d ProxyCurve return the startPoint of the primitive. tryTranslateInPlace(dx: number, dy: number = 0.0, dz: number = 0.0): boolean ProxyCurve try to move the geometry by dx,dy,dz areAlmostEqual(a: undefined | GeometryQuery, b: undefined | GeometryQuery): boolean Static ProxyCurve apply instance method isAlmostEqual if both are defined. installStrokeCountMap(curve: CurvePrimitive, curveMap: StrokeCountMap, parentMap?: StrokeCountMap): void Static ProxyCurve final install step to save curveMap in curve. Properties Name Type Description curvePrimitiveType Readonly "interpolationCurve" String name for schema properties Inherited properties Name Type Inherited from Description _proxyCurve Protected CurvePrimitive ProxyCurve children Accessor ReadOnly undefined | GeometryQuery[] ProxyCurve return GeometryQuery children for recursive queries.* leaf classes do not need to implement. geometryCategory Readonly "curvePrimitive" ProxyCurve String name for schema properties isExtensibleFractionSpace Accessor ReadOnly boolean ProxyCurve * Returns true if the curve's fraction queries extend beyond 0..1.* Base class default implementation returns false.* These class (and perhaps others in the future) will return true: * LineSegment3d * LineString3d * Arc3d parent undefined | any ProxyCurve data attached by various algorithms (e.g. strokeData undefined | StrokeCountMap ProxyCurve data attached during stroking for facets. Defined in bspline/AkimaCurve3d.ts Line 87 Last Updated: 29 November, 2022