## 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
clipBy01FunctionValuesPositive(f0: number, f1: number): boolean On input, `this` is an interval of a line.
clone(): 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.
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 distance)
create(x0: number = 0, x1: number = 1, result?: 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

Last Updated: 20 September, 2019