Thales theorem function and inverted

thalesTheorem.ts

/*
  a = minProgress
  b = minResult
  c = maxProgress
  d = maxResult
  x = result
  y = progress

  y = (-ad + ax + bc - cx) / (b - d)

 x = (ad - bc + by - dy) / (a - c)

 https://www.wolframalpha.com/input/?i=(x-a)%2F(y-b)+%3D+(c-x)%2F(d-y),+solve+to+y
 */

export const thalesTheorem = (
  minProgress: number,
  maxProgress: number,
  minResult: number,
  maxResult: number,
  result: number,
) => (
    (-minProgress * maxResult + minProgress * result + minResult * maxProgress - maxProgress * result)
    / (minResult - maxResult)
  );

export const thalesTheoremInverted = (
  minProgress: number,
  maxProgress: number,
  minResult: number,
  maxResult: number,
  progress: number,
) => (
    (minProgress * maxResult - minResult * maxProgress + minResult * progress - maxResult * progress)
    / (minProgress - maxProgress)
  );