/**
* Clear the link to the VisAD display. This will subsequently cause {@link #getDisplay()} and
* {@link #getControl()} to return <code>null</code>; consequently, information stored in the
* Control might have to be reestablished. This method invokes the method {@link
* ScalarMapListener#controlChanged(ScalarMapControlEvent)} on all registered {@link
* ScalarMapListener}s with this instance as the event source, {@link
* ScalarMapEvent#CONTROL_REMOVED} as the event ID, and the control as the event control.
*
* @throws RemoteException Java RMI failure
* @throws VisADException VisAD failure
*/
synchronized void nullDisplay() throws RemoteException, VisADException {
if (control != null) {
control.nullControl();
ScalarMapControlEvent evt;
evt = new ScalarMapControlEvent(this, ScalarMapEvent.CONTROL_REMOVED, control);
notifyCtlListeners(evt);
}
control = null;
display = null;
ScalarIndex = -1;
DisplayScalarIndex = -1;
scale_flag = back_scale_flag;
if (axisScale != null) axisScale.setAxisOrdinal(-1);
}
