direction property

JoystickDirection get direction

Implementation

JoystickDirection get direction {
  if (delta.isZero()) {
    return JoystickDirection.idle;
  }

  var knobAngle = delta.screenAngle();
  // Since screenAngle and angleTo doesn't care about "direction" of the angle
  // we have to use angleToSigned and create an only increasing angle by
  // removing negative angles from 2*pi.
  knobAngle = knobAngle < 0 ? 2 * pi + knobAngle : knobAngle;
  if (knobAngle >= 0 && knobAngle <= _eighthOfPi) {
    return JoystickDirection.up;
  } else if (knobAngle > 1 * _eighthOfPi && knobAngle <= 3 * _eighthOfPi) {
    return JoystickDirection.upRight;
  } else if (knobAngle > 3 * _eighthOfPi && knobAngle <= 5 * _eighthOfPi) {
    return JoystickDirection.right;
  } else if (knobAngle > 5 * _eighthOfPi && knobAngle <= 7 * _eighthOfPi) {
    return JoystickDirection.downRight;
  } else if (knobAngle > 7 * _eighthOfPi && knobAngle <= 9 * _eighthOfPi) {
    return JoystickDirection.down;
  } else if (knobAngle > 9 * _eighthOfPi && knobAngle <= 11 * _eighthOfPi) {
    return JoystickDirection.downLeft;
  } else if (knobAngle > 11 * _eighthOfPi && knobAngle <= 13 * _eighthOfPi) {
    return JoystickDirection.left;
  } else if (knobAngle > 13 * _eighthOfPi && knobAngle <= 15 * _eighthOfPi) {
    return JoystickDirection.upLeft;
  } else if (knobAngle > 15 * _eighthOfPi) {
    return JoystickDirection.up;
  } else {
    return JoystickDirection.idle;
  }
}