Try passing it a NULL. That means that you want to use all points. Otherwise you would pass it the address of an array of integers, whose value is either zero (meaning don't move the point) or non-zero.
If you want to do this in real time, then DisplayPosition or DisplayTranslation would be a better choice. The Asteroids source (included as part of the SDK) gives an excellent example of how to do things in real time.
Bill