/**
* Creates the Control for the associated DisplayScalar. This method invokes the method {@link
* ScalarMapListener#controlChanged(ScalarMapControlEvent)} on all registered {@link
* ScalarMapListener}s with this instance as the event source and {@link
* ScalarMapEvent#CONTROL_ADDED} or {@link ScalarMapEvent#CONTROL_REPLACED} as the event ID --
* depending on whether this is the first control or not. The event control is the previous
* control if the event ID is {@link ScalarMapEvent#CONTROL_REPLACED}. If the event ID is {@link
* ScalarMapEvent#CONTROL_ADDED}, then the event control is the created control or <code>null
* </code> -- depending on whether or not the control was successfully created.
*
* @throws RemoteException Java RMI failure
* @throws VisADException VisAD failure
*/
synchronized void setControl() throws VisADException, RemoteException {
int evtID;
Control evtCtl;
if (control != null) {
evtID = ScalarMapEvent.CONTROL_REPLACED;
evtCtl = control;
} else {
evtID = ScalarMapEvent.CONTROL_ADDED;
evtCtl = null;
}
if (display == null) {
throw new DisplayException("ScalarMap.setControl: not part of " + "any Display");
}
control = display.getDisplayRenderer().makeControl(this);
if (control != null) {
display.addControl(control);
if (evtCtl == null) {
evtCtl = control;
}
}
if (control != null || evtCtl != null) {
notifyCtlListeners(new ScalarMapControlEvent(this, evtID, evtCtl));
}
}
/**
* Specify <CODE>DisplayImpl</CODE> to be rendered.
*
* @param d <CODE>Display</CODE> to render.
* @exception VisADException If a <CODE>DisplayImpl</CODE> has already been specified.
*/
public void setDisplay(DisplayImpl d) throws VisADException {
if (display != null) {
throw new DisplayException("DisplayRenderer.setDisplay: " + "display already set");
}
display = d;
// reinitialize rendererControl
if (rendererControl == null) {
rendererControl = new RendererControl(display);
initControl(rendererControl);
} else {
RendererControl rc = new RendererControl(display);
rc.syncControl(rendererControl);
rendererControl = rc;
}
rendererControl.addControlListener(this);
display.addControl(rendererControl);
}