API Reference > geometry-core > Curve > ProxyCurve ProxyCurve Class A ProxyCurve is expected to be used as a base class for curve types that use some existing curve (the proxy) for evaluation and display but carry other defining data. The ProxyCurve implements all required CurvePrimitive methods by dispatching to the proxy. These methods presumably require support from the application class and are left abstract: clone clonePartialCurve cloneTransformed curvePrimitiveType isSameCurvePrimitiveType isSameGeometryClass tryTransformInPlace reverseInPlace Extends CurvePrimitive Extended by AkimaCurve3d InterpolationCurve3d Methods Name Description constructor(proxyCurve: CurvePrimitive): ProxyCurve Constructor CAPTURES the proxyCurve pointer computeStrokeCountForOptions(options?: StrokeOptions): number Implement by proxyCurve dispatchToGeometryHandler(handler: GeometryHandler): any * "double dispatch" call pattern. emitStrokableParts(dest: IStrokeHandler, options?: StrokeOptions): void Implement by proxyCurve emitStrokes(dest: LineString3d, options?: StrokeOptions): void Implement by proxyCurve extendRange(rangeToExtend: Range3d, transform?: Transform): void Implement by proxyCurve fractionToPoint(fraction: number, result?: Point3d): Point3d Implement by proxyCurve fractionToPointAnd2Derivatives(fraction: number, result?: Plane3dByOriginAndVectors): undefined | Plane3dByOriginAndVectors Implement by proxyCurve fractionToPointAndDerivative(fraction: number, result?: Ray3d): Ray3d Implement by proxyCurve isInPlane(plane: Plane3dByOriginAndUnitNormal): boolean Implement by proxyCurve quickLength(): number Compute a length which may be an fast approximation to the true length. range(transform?: Transform, result?: Range3d): Range3d Implement by proxyCurve Inherited methods Name Inherited from Description addMappedStrokesToLineString3D(map: StrokeCountMap, linestring: LineString3d): number CurvePrimitive * evaluate strokes at fractions indicated in a StrokeCountMap. announceClipIntervals(_clipper: Clipper, _announce?: AnnounceNumberNumberCurvePrimitive): boolean CurvePrimitive Find intervals of this curvePrimitive that are interior to a clipper appendPlaneIntersectionPoints(plane: PlaneAltitudeEvaluator, result: CurveLocationDetail[]): number CurvePrimitive Compute intersections with a plane. clone(): undefined | GeometryQuery Abstract CurvePrimitive return a clone clonePartialCurve(_fractionA: number, _fractionB: number): undefined | CurvePrimitive CurvePrimitive Return (if possible) a curve primitive which is a portion of this curve. cloneTransformed(transform: Transform): undefined | GeometryQuery Abstract CurvePrimitive return a transformed clone. closestPoint(spacePoint: Point3d, extend: VariantCurveExtendParameter): undefined | CurveLocationDetail CurvePrimitive Search for the curve point that is closest to the spacePoint. collectCurvePrimitives(collectorArray?: CurvePrimitive[], smallestPossiblePrimitives: boolean = false, explodeLinestrings: boolean = false): CurvePrimitive[] CurvePrimitive Return an array containing only the curve primitives. collectCurvePrimitivesGo(collectorArray: CurvePrimitive[], _smallestPossiblePrimitives: boolean, _explodeLinestrings: boolean = false): void CurvePrimitive Return an array containing only the curve primitives. computeAndAttachRecursiveStrokeCounts(options?: StrokeOptions, parentMap?: StrokeCountMap): void CurvePrimitive attach StrokeCountMap structure to this primitive (and recursively to any children) curveLength(): number CurvePrimitive return the length of the curve. curveLengthBetweenFractions(fraction0: number, fraction1: number): number CurvePrimitive Returns a (high accuracy) length of the curve between fractional positions curveLengthWithFixedIntervalCountQuadrature(fraction0: number, fraction1: number, numInterval: number, numGauss: number = 5): number CurvePrimitive * Run an integration (with a default gaussian quadrature) with a fixed fractional step endPoint(result?: Point3d): Point3d CurvePrimitive return the end point of the primitive. fractionAndDistanceToPointOnTangent(fraction: number, distance: number): Point3d CurvePrimitive Construct a point extrapolated along tangent at fraction. fractionToCurvature(fraction: number): undefined | number CurvePrimitive Returns the (absolute) curvature magnitude. fractionToFrenetFrame(fraction: number, result?: Transform): undefined | Transform CurvePrimitive Construct a frenet frame: fractionToPointAndUnitTangent(fraction: number, result?: Ray3d): Ray3d CurvePrimitive Returns a ray whose origin is the curve point and direction is the unit tangent. getFractionToDistanceScale(): undefined | number CurvePrimitive * If the curve primitive has distance-along-curve strictly proportional to curve fraction, return true isAlmostEqual(other: GeometryQuery): boolean CurvePrimitive test for exact structure and nearly identical geometry. isSameGeometryClass(other: GeometryQuery): boolean Abstract CurvePrimitive test if (other instanceof this.Type). moveSignedDistanceFromFraction(startFraction: number, signedDistance: number, allowExtension: boolean, result?: CurveLocationDetail): CurveLocationDetail CurvePrimitive * (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 CurvePrimitive Generic algorithm to search for point at signed distance from a fractional startPoint. reverseInPlace(): void Abstract CurvePrimitive Reverse the curve's data so that its fractional stroking moves in the opposite direction. startPoint(result?: Point3d): Point3d CurvePrimitive return the startPoint of the primitive. tryTransformInPlace(transform: Transform): boolean Abstract CurvePrimitive Attempt to transform in place. tryTranslateInPlace(dx: number, dy: number = 0.0, dz: number = 0.0): boolean CurvePrimitive try to move the geometry by dx,dy,dz areAlmostEqual(a: undefined | GeometryQuery, b: undefined | GeometryQuery): boolean Static CurvePrimitive apply instance method isAlmostEqual if both are defined. installStrokeCountMap(curve: CurvePrimitive, curveMap: StrokeCountMap, parentMap?: StrokeCountMap): void Static CurvePrimitive final install step to save curveMap in curve. Properties Name Type Description _proxyCurve Protected CurvePrimitive Inherited properties Name Type Inherited from Description children Accessor ReadOnly undefined | GeometryQuery[] CurvePrimitive return GeometryQuery children for recursive queries.* leaf classes do not need to implement. curvePrimitiveType AbstractReadonly CurvePrimitiveType CurvePrimitive String name for schema properties geometryCategory Readonly "curvePrimitive" CurvePrimitive String name for schema properties isExtensibleFractionSpace Accessor ReadOnly boolean CurvePrimitive * 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 CurvePrimitive data attached by various algorithms (e.g. strokeData undefined | StrokeCountMap CurvePrimitive data attached during stroking for facets. Defined in curve/ProxyCurve.ts Line 39 Last Updated: 11 June, 2024