Chapter 5: MVC Architecture Chapter 5.

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Presentation transcript:

Chapter 5: MVC Architecture Chapter 5

We will … Learn MVC software architecture Describe MVC-based solution for ball shooting Examine Expendability of MVC solutions Develop software library support for MVC framework: UWBGL Chapter 5

In a nutshell … So far … This chapter: Programming model: event driven GUI API: elements and event registrations Graphics API: GHC initialization and drawing with RC This chapter: MVC Architecture: consolidate all of the above! Chapter 5

The MVC Architecture Chapter 5

Model-View-Controller Application state The persistent variables View Draws the application state Graphics API support Controller Accepts input from user to change the model GUI API support Chapter 5

Model of Ball shooting program Chapter 5

Model: Application State: Support: All persistent variables State Inquiries State Changes Timer event support (Simulation update) State Visualization Chapter 5

View of Ball shooting program Chapter 5

Controller of Ball shooting program ViewController: is our Camera! Chapter 5

Expanding Ball shooting program Chapter 5

Implement 2 views … Chapter 5

Notes on MVC … Simplicity: Portability: Expendability: Model: usually most complex MVC: allow design of Model to be independent from user interaction and from drawing Portability: E.g., Change of controller ports Model to a different GUI platform Expendability: As we have seen: adding new view/controller pairs is straightforward Chapter 5

MVC: component interactions User change application state: Via controllers Application changes its own state Via timer events All controllers and views must present consistent state GUI element must be correct: e.g., slider bar reflecting the falling hero ball position Drawing must be update to date Classic MVC architecture Elaborate protocol to ensure all states are consistent … Chapter 5

MVC with real-time simulation … Every 25 milliseconds: timer fires! Application state likely to change MUST redraw all views!! During Timer event … ALWAYS Poll/update all controllers Update Application state Update all views Simple update protocol Chapter 5

2-View ball shooting component interaction Chapter 5

Inter-Ball Collision Chapter 5