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"Interactive Graphics-Based Applets"
Vol. 2, Issue 11, p. 72

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Listing 1. 

         public class IllusionApplet extends Applet{  
             private int canvasWidth, canvasHeight;  
             private RegisterObject ro; 
             /* Shapes (models or observables) used  
              in this applet */  
             private StandardLineShape stdLine;  

             public void init(){  
             // this object helps coordinates & 
                 between shapes  
             ro = new RegisterObject 
              (lineThicknessInPixels);  

             /* create models or observables */  
             stdLine = new  
StandardLineShape(canvasWidth, canvasHeight, ro);  
             } 
  

Listing 2. 

        // methods / public / IObservable implementation  
        public void addIObserver(IObserver anIObserver) {  
        myObservableComponent.addIObserver(anIObserver);  
        }  

        public void deleteIObserver(IObserver anIObserver) {  
        myObservableComponent.deleteIObserver(anIObserver);  
        }  

        public void deleteIObservers() {  
        myObservableComponent.deleteIObservers();  
        } 

Listing 3. 

        // IObservable implementation  
        public void addIObserver(IObserver anIObserver) {  
            myObservableComponent.addIObserver & 
          (anIObserver); }  

        public void deleteIObserver(IObserver anIObserver) {  
            myObservableComponent.deleteIObserver & 
          (anIObserver); }  

        public void deleteIObservers() {  
            myObservableComponent.deleteIObservers(); }  

        // IObserver implementation  
        public void update(Object theObserved,  & 
          Object changeCode){  
           updateMe();  
           myObservableComponent.notifyIObservers & 
            (theObserved,changeCode);  
        } 
  
  

©Board of Trustees, University of Illinois, 1997. Information concerning  use of 
these classes and interfaces  can be obtained from the Department  of 
Psychology, University of Illinois, 603 E. Daniel, Champaign, Illinois 61801. 
Redistribution and  use, with and without modifications, are permitted for any 
purpose provided that  the source code retain the above copyright notice.  All 
publications  or advertising materials mentioning features or use of this 
software must acknowledge that it was developed by the University of Illinois at 
Urbana-Champaign and credit the contributors. THIS SOFTWARE IS PROVIDED BY THE 
UNIVERSITY AND THE CONTRIBUTORS “AS IS” WITH NO WARRANTY OF ANY KIND, EITHER 
EXPRESSED OR IMPLIED. In no event shall the University or the contributors be 
liable for any damages suffered by the users arising out of the  use of this 
software, even if advised of the possibility of such damage. 




 

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