func OnLineHeader(){
output(LH);
}
func OnTrace(){
 x = Tr.SrPtXC - Tr.RcPtXC;
 y = Tr.SrPtYC - Tr.RcPtYC;
 Tr.DstSgn = sqrt ( x*x + y*y );
 Tr.DstUsg = Tr.DstSgn;
 output(Tr);
}