MathUtil.ts

export const MathUtil = {
  /**
   * Interpolates a value from one range to another
   * @param inputRange - number array of length 2 that represents the original range
   * @param outputRange - number array of length 2 that represents the new range
   * @param value - the value to interpolation
   * @returns
   */
  interpolate(inputRange: number[], outputRange: number[], value: number) {
    if (inputRange.length !== 2 || outputRange.length !== 2) {
      throw new Error('inputRange and outputRange must be an array of length 2')
    }

    const originalRangeMin = inputRange[0] || 0
    const originalRangeMax = inputRange[1] || 0
    const newRangeMin = outputRange[0] || 0
    const newRangeMax = outputRange[1] || 0

    if (value < originalRangeMin) {
      return newRangeMin
    }
    if (value > originalRangeMax) {
      return newRangeMax
    }

    return (
      ((newRangeMax - newRangeMin) / (originalRangeMax - originalRangeMin)) *
        (value - originalRangeMin) +
      newRangeMin
    )
  }
}