index.js
function getDirection(x, y) {
  if (x === y) {
    return DIRECTION_NONE;
  }

  if (abs(x) >= abs(y)) {
    return x > 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
  }
  return y > 0 ? DIRECTION_UP : DIRECTION_DOWN;
}
function getDirection(x, y) {
  if (x === y) {
    return DIRECTION_NONE;
  }

  if (abs(x) >= abs(y)) {
    return x > 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
  }
  return y > 0 ? DIRECTION_UP : DIRECTION_DOWN;
}
function getDirection ( x , y ) { if ( x === y ) { return DIRECTION_NONE ; } if ( abs ( x ) >= abs ( y ) ) { return x > 0 ? DIRECTION_LEFT : DIRECTION_RIGHT ; } return y > 0 ? DIRECTION_UP : DIRECTION_DOWN ; }
get the direction between two points
@param {Number} x
@param {Number} y
@return {Number} direction
get the direction between two points