onPointerMove method
      
void
onPointerMove(
    
    
- dynamic event
Implementation
void onPointerMove( event ) {
  if (!enabled || !_isDown || event.pointerType == 'touch_pad') return;
  updatePointer(event);
  _endPoint.setFrom(_pointer);
  _endPoint.z = 0;
  onSelectMove(event);
}