CurveChainWithDistanceIndex Class

CurveChainWithDistanceIndex is a CurvePrimitive whose fractional parameterization is proportional to true distance along a CurveChain.

  • The curve chain can be any type derived from CurveChain.
    • i.e. either a Path or a Loop



Name Description
chainDistanceToChainFraction(distance: number): number Convert distance along the chain to fraction along the chain.  
chainDistanceToFragment(distance: number, allowExtrapolation: boolean = false): undefined | PathFragment Resolve a fraction of the CurveChain to a PathFragment  
chainDistanceToFragmentIndex(distance: number, allowExtrapolation: boolean = false): undefined | number Protected Resolve a fraction of the CurveChain to a PathFragment index  
clone(): CurveChainWithDistanceIndex Return a deep clone  
clonePartialCurve(fractionA: number, fractionB: number): undefined | CurveChainWithDistanceIndex Return a deep clone  
cloneTransformed(transform: Transform): undefined | CurveChainWithDistanceIndex Create a clone, transformed and with its own distance index.  
closestPoint(spacePoint: Point3d, extend: VariantCurveExtendParameter): undefined | CurveLocationDetail Search for the curve point that is closest to the spacePoint.  
collectCurvePrimitivesGo(collectorArray: CurvePrimitive[], smallestPossiblePrimitives: boolean = false, explodeLineStrings: boolean = false): void Return an array containing only the curve primitives.  
computeAndAttachRecursiveStrokeCounts(options?: StrokeOptions, parentStrokeMap?: StrokeCountMap): void construct StrokeCountMap for each child, accumulating data to stroke count map for this primitive.  
computeStrokeCountForOptions(options?: StrokeOptions): number return the stroke count required for given options.  
constructOffsetXY(offsetDistanceOrOptions: number | OffsetOptions): undefined | CurvePrimitive | CurvePrimitive[] Construct an offset of each child as viewed in the xy-plane (ignoring z).  
curveAndChildFractionToFragment(curve: CurvePrimitive, fraction: number): undefined | PathFragment Resolve a fraction within a specific curve to a fragment.  
curveLength(): number Returns the total length of curves.  
curveLengthBetweenFractions(fraction0: number, fraction1: number): number * Curve length is always positive.  
dispatchToGeometryHandler(handler: GeometryHandler): any Second step of double dispatch: call this._path.dispatchToGeometryHandler (handler)  
emitStrokableParts(dest: IStrokeHandler, options?: StrokeOptions): void Ask the curve to announce points and simple subcurve fragments for stroking.  
emitStrokes(dest: LineString3d, options?: StrokeOptions): void Add strokes to caller-supplied linestring  
endPoint(result?: Point3d): Point3d Return the end point of the primitive.  
extendRange(rangeToExtend: Range3d, transform?: Transform): void Extend (increase) rangeToExtend as needed to include these curves (optionally transformed)  
fractionToPoint(fraction: number, result?: Point3d): Point3d Return the point (x,y,z) on the curve at fractional position along the chain.  
fractionToPointAnd2Derivatives(fraction: number, result?: Plane3dByOriginAndVectors): undefined | Plane3dByOriginAndVectors Return a plane with  
fractionToPointAndDerivative(fraction: number, result?: Ray3d): Ray3d Return the point (x,y,z) and derivative on the curve at fractional position.  
fractionToPointAndUnitTangent(fraction: number, result?: Ray3d): Ray3d Returns a ray whose origin is the curve point and direction is the unit tangent.  
isAlmostEqual(other: GeometryQuery): boolean Test for equality conditions:  
isInPlane(plane: Plane3dByOriginAndUnitNormal): boolean Ask if the curve is within tolerance of a plane.  
isSameGeometryClass(other: GeometryQuery): boolean Test if other is a CurveChainWithDistanceIndex  
moveSignedDistanceFromFraction(startFraction: number, signedDistance: number, allowExtension: boolean, result?: CurveLocationDetail): CurveLocationDetail Implement moveSignedDistanceFromFraction.  
projectedParameterRange(ray: Vector3d | Ray3d, lowHigh?: Range1d): undefined | Range1d Project instance geometry (via dispatch) onto the given ray, and return the extreme fractional parameters of projection.  
quickLength(): number Returns the total length of the path.  
reverseInPlace(): void Reverse the curve's data so that its fractional stroking moves in the opposite direction.  
startPoint(result?: Point3d): Point3d return the start point of the primitive.  
tryTransformInPlace(transform: Transform): boolean Attempt to transform in place.  
createCapture(path: CurveChain, options?: StrokeOptions): CurveChainWithDistanceIndex Static Capture (not clone) a path into a new CurveChainWithDistanceIndex  
getClosestPointTestCounts(clear: boolean = true): { numAssigned: number, numCalls: number, numCandidate: number, numTested: number } Static The returned object has  

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.
collectCurvePrimitives(collectorArray?: CurvePrimitive[], smallestPossiblePrimitives: boolean = false, explodeLinestrings: boolean = false): CurvePrimitive[] CurvePrimitive Return an array containing only the curve primitives.
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
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:
fractionToSignedXYRadiusOfCurvature(fraction: number): number CurvePrimitive Construct signed distance from a point on the curve to its center of curvature (in xy only).
getFractionToDistanceScale(): undefined | number CurvePrimitive * If the curve primitive has distance-along-curve strictly proportional to curve fraction, return the scale factor.
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.
range(transform?: Transform, result?: Range3d): Range3d CurvePrimitive return the range of the entire (tree) GeometryQuery
rangeBetweenFractions(fraction0: number, fraction1: number, transform?: Transform): Range3d CurvePrimitive Returns a (high accuracy) range of the curve between fractional positions
rangeBetweenFractionsByClone(fraction0: number, fraction1: number, transform?: Transform): Range3d CurvePrimitive Returns a (high accuracy) range of the curve between fractional positions
rangeBetweenFractionsByCount(fraction0: number, fraction1: number, count: number, transform?: Transform, extrapolationFactor: number = 0.0): Range3d CurvePrimitive Returns an approximate range based on a fixed number of evaluations
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.


Name Type Description
curvePrimitiveType Readonly "curveChainWithDistanceIndex" String name for schema properties  
fragments Accessor ReadOnly PathFragment[] Reference to the fragments array.  
path Accessor ReadOnly CurveChain Reference to the contained path.  

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.
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

Last Updated: 22 March, 2023