/** set tickFlag according to OldTick and NewTick */
public synchronized void setTicks() {
tickFlag = (OldTick < NewTick || (NewTick < 0 && 0 < OldTick));
/*
System.out.println(Scalar + " -> " + DisplayScalar +
" set tickFlag = " + tickFlag);
*/
OldTick = NewTick;
if (control != null) control.setTicks();
}
