nl_tokens: Initializes movement tracking
pl_tokens: function onDown ( ev ) { var event = normalizeEvent ( ev ) ; if ( ! pointerActive && ! paused ) { pointerActive = <mask> ; decelerating = false ; pointerId = event . id ; pointerLastX = pointerCurrentX = event . x ; pointerLastY = pointerCurrentY = event . y ; trackingPoints = [ ] ; addTrackingPoint ( pointerLastX , pointerLastY ) ; addRuntimeEvents ( ) ; } }