/* ufh script to pad traces at start and end of stacked dataset
   where stack is made up of n 1trace records
 */

func Begin(){
    
    counter = 0;
    RightTracePad = 105; /* traces to pad to right of stack */
    LeftTracePad = 105; /* traces to pad to left of stack */
    RecordStart = 1;  /* record to pad in front of */
}

func OnLineHeader(){
    
    OldNumRec = LH.NumRec;
    NewNumRec = LH.NumRec + LeftTracePad + RightTracePad;
    LH.NumRec = NewNumRec;
    output(LH);
    
}

func OnTrace(){
    
    if ( Tr.RecNum == RecordStart ){
	
	Te = Tr; /* assign Trace to temp storage */
	Tr.Series  = 0.; /* zero out padded trace, comment out if not desired */
	
	for ( counter = 0 ; counter < RightTracePad ; counter++ ) {
	    
	    Tr.RecNum = counter + 1; 
	    output(Tr);  /* output padded trace */
	    
	}
	
	counter = 0;
	Tr = Te; /* restore initial trace */
	
    }
    
    Tr.RecNum = Tr.RecNum + RightTracePad;
    output(Tr);
    
    if ( Tr.Recnum == (OldNumRec + RecordStart - 1 + RightTracePad) ) {
	
	Tr.Series = 0.;
	
	for ( counter = 0 ; counter < LeftTracePad ; counter++ ){
	    
	    Tr.RecNum = counter + (OldNumRec + RightTracePad);
	    output(Tr);
	    
	}
    }
}