User:BenMcDonald

Ben McDoanld's page

I am doing my design study for my COSC426:Augmented Reality project. I need a design for a boxing skills trainer. No code has been written so far. I have made a sketch of the requirements for the design of the software. The project is in C++ using the libraries open scene graph (osg) and augmented reality tool-kit open scene graph (ARTosg)

Requirements:

• A score needs to be generated from a set of tested skills:
  • Consistent guard
  • Eyes forward and on opponent
  • Bobbing and weaving
  • Timing of punches
• Each skill needs to be modelled and the evaluation method for each skill also needs to be modelled.
• The performance on the skills needs to be evaluated and for additional activities to be recommended to the athlete.
• An athlete’s evaluation history, progress and general details to be recorded and recoverable.

Iteration One

Design:

Observer Pattern:

• Subject - Observable
• ConcreteSubject - Athlete
• Observer - Observer
• ConcreteObserver - Trainer

Iteration Two

Design:

State Pattern:

• Context - Trainer
• State - TrainingState
• ConcreteStates - PunchingDrill, BobbingAndWeaving

Observer Pattern:

• Subject - Observable
• ConcreteSubject - UserBoxer
• Observer - Observer
• ConcreteObserver - Trainer

Observer Pattern:

• Subject - Observable
• ConcreteSubject - Trainer
• Observer - Observer
• ConcreteObserver - TrainerAnimation

The design is modular. The osg libraries are only used in two classes, TrainerAnimation and osgDiplay, and no other classes are dependent on this graphics library. This is achieved through the observer pattern. TrainerAnimation observers the Trainer and because of this the Trainer class has no knowlege and is therefore independent of the way is displayed and the osg graphics library.

Maxims that have been useful:

• Command query separation - One plus of C++ is that you can mark queries, and enforce them, with the const keyword.
• Design by contract - Using assert's to enforce conditions at the moment