shortestTurnsToReachTarget method

double shortestTurnsToReachTarget({
  1. required double current,
  2. required double target,
})

Determines which next turn value should be used to have the least rotation movements between current and target

E.g: when being at 0.5 turns, should I go to 0.75 or to -0.25 to minimize the rotation ?

Implementation

double shortestTurnsToReachTarget({required double current, required double target}) {
  final currentDegree = current * 360;
  final targetDegree = target * 360;

  // Determine if we need to go clockwise or counterclockwise to reach
  // the next angle with the least movements
  // See https://math.stackexchange.com/a/2898118
  final clockWise = (targetDegree - currentDegree + 540) % 360 - 180 > 0;
  double resultDegree = currentDegree;
  do {
    resultDegree += (clockWise ? 1 : -1) * 360 / 4;
  } while (resultDegree % 360 != targetDegree % 360);

  // Revert back to turns
  return resultDegree / 360;
}