API Reference > geometry-core > CartesianGeometry > Segment1d Segment1d Class A Segment1d is an interval of an axis named x. The interval is defined by two values x0 and x1. The x0 and x1 values can be in either order. if x0 < x1 fractional coordinates within the segment move from left to right. if x0 > x1 fractional coordinates within the segment move from right to left. This differs from a Range1d in that: For a Range1d the reversed ordering of its limit values means "empty interval". For a Segment1d the reversed ordering is a real interval but fractional positions move backwards. The segment is parameterized with a fraction Fraction 0 is the start (x0) Fraction 1 is the end (x1) The fraction equation is x = x0 + fraction * (x1-x0) or (equivalently) x = (1-fraction) * x0 + fraction * x1 Methods Name Description absoluteDelta(): number Return the absolute start-to-end shift (aka distance) clampDirectedTo01(): boolean * On input, (f0,f1) is a (directed) segment. clipBy01FunctionValuesPositive(f0: number, f1: number): boolean On input, this is an interval of a line. clone(): Segment1d clone this Segment1d, return as a separate object. fractionToPoint(fraction: number): number Evaluate the segment at fractional position isAlmostEqual(other: Segment1d): boolean Near equality test, using Geometry.isSameCoordinate for tolerances. reverseIfNeededForDeltaSign(sign: number = 1): void * if x1<x0 multiplied by the scale factor is (strictly) negative, swap the x0 and x1 member values. reverseInPlace(): void * swap the x0 and x1 member values. set(x0: number, x1: number): void replace both end values. setFrom(other: Segment1d): void Copy both end values from other Segment1d shift(dx: number): void shift (translate) the segment along its axis by adding dx to both x0 and x1. signedDelta(): number Return the signed start-to-end shift (aka signed distance) create(x0: number = 0, x1: number = 1, result?: Segment1d): Segment1d Static create segment1d with given end values Properties Name Type Description isExact01 Accessor ReadOnly boolean Return true if the segment limits are (exactly) 0 and 1 isExact01Reversed Accessor ReadOnly boolean Return true if the segment limits are (exactly) 1 and 0 isIn01 Accessor ReadOnly boolean Returns true if both coordinates (x0 and x1) are in the 0..1 range. x0 number start coordinate x1 number end coordinate Defined in geometry3d/Segment1d.ts Line 27 Last Updated: 11 June, 2024