public void alter(Instance instance,Transform matrix,AlphaTransform cxform,int ratio){
  Placement placement=new Placement(instance,matrix,cxform,null,ratio,-1,frameNumber,true,false,null);
  placements.add(placement);
}

public void alter ( Instance instance , Transform matrix , AlphaTransform cxform , int ratio ) { Placement placement = new Placement ( instance , matrix , cxform , null , ratio , - 1 , frameNumber , true , false , null ) ; placements . add ( placement ) ; }
alter the symbol instance by applying the given properties . only one alteration may be made to an instance in any given frame .
