function rebasePositive(angle){
  if(angle < 0){
    return angle + TWO_PI;
  } else {
    return angle;
  }
}
// rather than -pi to pi
rather than -pi to pi
rather than - pi to pi
function rebasePositive(angle){
  if(angle < 0){
    return angle + TWO_PI;
  } else {
    return angle;
  }
}
function rebasePositive ( angle ) { if ( angle < 0 ) { return angle + TWO_PI ; } else { return angle ; } }
rather than -pi to pi
rather than - pi to pi