private function update(e:Event):void
{
    var v:b2Vec2 = ball.body.GetLinearVelocity();

    var len:Number = Math.abs(v.x);

    if (len < 4)
    {
        scaleDest = 1;
    }
    else
    {
        scaleDest = 0.7;
    }

    scale += (scaleDest - scale) / 8;
    dx += (currQuick.x*30 - dx) / 8;
    dy += (currQuick.y*30 - dy) / 8;
    // matrix zoom/pan

    var m:Matrix = canvas.transform.matrix;
    m.identity();
    m.translate(-dx,-dy);
    m.scale(scale, scale);
    m.translate(dx,dy);
    canvas.transform.matrix = m;

}