void HelloMultitouchApp::update()
{
    GestureWorks::Instance()->ProcessFrame();
    std::vector<gwc::PointEvent> point_events = GestureWorks::Instance()->ConsumePointEvents();

    for (std::vector<gwc::PointEvent>::iterator event_it = point_events.begin(); event_it != point_events.end(); event_it++) {

        std::pair<int, int> pair = normScreenToWindowPx(event_it->position.x, event_it->position.y);

        switch (event_it->status) {
        case gwc::TOUCHADDED:
        case gwc::TOUCHUPDATE:
            //If the point is being added, this will place it in our point map;
            //the same line of code will update the point's position if it's
            //already present, so we can use this command to handle new points
            //as well as point updates
            active_points[event_it->point_id] = gwc::Point(pair.first, pair.second);
            break;
        case gwc::TOUCHREMOVED:
            //Remove the point from the map
            active_points.erase(event_it->point_id);
            break;
        }
    }
}