TransitionWindowSegment specification

This is the engineering specification for the TransitionWindowSegment type.

Overview

A TransitionWindowSegment represents a specific region in a TransitionWindow.

MVP

Struct type

TransitionWindowSegment is a struct type, if the language allows.

struct TransitionWindowSegment {
}

position and length APIs

Provide two read-writable values for position and length.

Position and length must be expressed in normalized units from 0...1 inclusively. The sum of these two values must never exceed 1.

struct TransitionWindowSegment {
  var position
  var length
}

Assertions:

• 0 <= position <= 1
• 0 <= length <= 1
• 0 <= position + length <= 1

Inverted API

Provide an API for inverting a segment.

TransitionWindowSegment {
  /** Returns a new segment with an inverted position. */
  func inverted() -> TransitionWindowSegment {
    return TransitionWindowSegment(position: 1 - (position + length), length: length)
  }

Epsilon

Include an epsilon constant.

/** Epsilon for use when comparing TransitionWindowSegment values. */
let TransitionWindowSegmentEpsilon = 0.00001