Draw Application

The Draw application represents a case study in designing a GUI-based application that incorporates a number of design patterns. Find the git repository at https://github.com/heineman/DesignPatterns_Draw.

• Singleton -- Restrict object creation for a class to only one instance. Used in Tools and ClipboardManager
• Adapter -- Allow classes with incompatible interfaces to work together. Used in ActiveToolHandler.

  

• Chain of Responsibility -- Delegate commands to a chain of processing objects. Used in Handler.

  

• Command -- Create objects which encapsulate actions and parameters. Used in Command.
• Composite -- Compose similar objects so they can be manipulated as one object. Used in Group.

  

• Visitor -- Separate algorithm from object structure. Used in Visitor.

  

The generated JavaDoc for the different draw.N tags are found below. The final version (draw.5) represents the completed application.

1. draw.0
2. draw.1
3. draw.2
4. draw.3
5. draw.4
6. draw.5