Object-oriented design - Object model - the peer did 20 minutes talk

Object-orientedDesign

 Let's say we're developing a vector graphics application. It will allow the user to create lines, rectangles, circles, text, etc. and manipulate them independently - move them, re-size them, etc. Design an object model for this application.

• How would you model the representation of the document in an object oriented language?
• What classes would you define?
• What methods would you have? What would your API look like?
      Class:
      - User
      - Graph parent class, method, move, resize,...etc
      - Subclasses: rectangles, circles, squares,... 
      
      Methods:
      - User
        List<Graph> lis;
        create(Graph g) {
          g.create();
          lis.add(g);
        }
        move(Graph g) {
          g.move();
        }
        resize(Graph g) {
          g.resize();
        }
  
      - Graph { (abstract class or interface)
        create();
        move();
        resize();
      }
  
      - Circles() implements Graph {
        create() {
          
        }
        
        move() {
          
        }
        
        resize() {
          
        }
      }
      
       API: REST API design     
     //RPC vs REST
      // RPC : POST /createCircles body {id:, radius,..}
      //       GET /getCircles
      
      // REST: POST /circles/{id} {radus:...}
      //       GET /circles/{id}