drools-eclipse/org.drools.eclipse/src/main/java/org/drools/eclipse/editors/rete/model/GraphicalVertex.java
public void setLocation(Point newLocation) {
        if ( newLocation == null ) {
            throw new IllegalArgumentException();
        }
        location.setLocation( newLocation );
        firePropertyChange( LOCATION_PROP,
                            null,
                            location );
    }
public void setLocation(Point newLocation) {
        if ( newLocation == null ) {
            throw new IllegalArgumentException();
        }
        location.setLocation( newLocation );
        firePropertyChange( LOCATION_PROP,
                            null,
                            location );
    }
Set the Location of this vertex.
@param newLocation a non-null Point instance
@throws IllegalArgumentException if the parameter is null