Use Case 9--Change Controls

Context of Use:
The User decides that the default controls for the application are not desirable and wishes to customize.
　

Scope:
J2ME Pac-man Game Application
　

Level:
User Goal
　

Primary Actor:
Mobile Phone or PDA User
　

Stakeholder and Interests:
User: wants to customize controls.
　

Precondition:
The User has started the application and is at the Main Menu.
　

Minimal Guarantees:
Does not crash the application and default controls are restored.
　

Success Guarantees:
The User is transferred back to the Main Menu with the new controls saved.
　

Trigger:
User selects "Change Controls" from the Main Menu.
　

Main Success Scenario:
　

• 1. User selects "Change Controls" from the Main Menu.
  　
• 2. Application prompts User to press the desired 'UP' button. User presses desired button and System saves preference.
  　
• 3. Application prompts User to press the desired 'DOWN' button. User presses desired button and System saves preference.
  　
• 4. Application prompts User to press the desired 'LEFT' button. User presses desired button and System saves preference.
  　
• 5. Application prompts User to press the desired 'RIGHT' button. User presses desired button and System saves preference.
  　
• 6. Application prompts User to press the desired 'PAUSE' button. User presses desired button and System saves preference.
  　
• 7. Application prompts User to press the desired 'EXIT' button. User presses desired button and System saves preference.
  　
• 8. User is given a Success Message and is returned to the Main Menu.
  　

Extensions:
　

• 2a. User does not respond
  　
  • 2al. System will have a timeout (to be determined) and will then return the User to the Main Menu with the default controls restored.
    　
• 2b. Application error on saving control.
  　
  • 2bl. System displays a message that an Application error has happened.
    　
  • 2b2. User is taken back to the Main Menu, and default controls are restored
    　
• 3a. User does not respond
  　
  • 3al. System will have a timeout (to be determined) and will then return the User to the Main Menu with the default controls restored.
    　
• 3b. Application error on saving control.
  　
  • 3bl. System displays a message that an Application error has happened.
    　
  • 3b2. User is taken back to the Main Menu, and default controls are restored.
    　
• 3c. User selects a button that has previously been selected in this configuration.
  　
  • 3c1. System prompts User for new selection.
    　
• 3d. System displays a message that the button already exists in this configuration.
  　
  • 3d1. System prompts User for new selection.
    　
• 4a. User does not respond
  　
  • 4al. System will have a timeout (to be determined) and will then return the User to the Main Menu with the default controls restored.
    　
• 4b. Application error on saving control.
  　
  • 4bl. System displays a message that an Application error has happened.
    　
  • 4b2. User is taken back to the Main Menu, and default controls are restored
    　
• 4c. User selects a button that has previously been selected in this configuration
  　
  • 4cl. System displays a message that the button already exists in this configuration.
    　
  • 4c2. System prompts User for new selection.
    　
• 5a. User does not respond
  　
  • Sal. System will have a timeout (to be determined) and will then return the User to the Main Menu with the default controls restored.
    　
• 5b. Application error on saving control.
  　
  • 5bl. System displays a message that an Application error has happened.
    　
  • 5b2. User is taken back to the Main Menu, and default controls are restored
    　
• 5c. User selects a button that has previously been selected in this configuration
  　
  • 5cl. System displays a message that the button already exists in this configuration.
    　
  • 5c2. System prompts User for new selection.
    　
• 6a. User does not respond
  　
  • 6al. System will have a timeout (to be determined) and will then return the User to the Main Menu with the default controls restored.
    　
• 6b. Application error on saving control.
  　
  • 6bl. System displays a message that an Application error has happened.
    　
  • 6b2. User is taken back to the Main Menu, and default controls are restored
    　
• 6c. User selects a button that has previously been selected in this configuration
  　
  • 6cl. System displays a message that the button already exists in this configuration.
    　
  • 6c2. System prompts User for new selection.
    　
• 7a. User does not respond
  　
  • 7al. System will have a timeout (to be determined) and will then return the User to the Main Menu with the default controls restored.
    　
• 7b. Application error on saving control.
  　
  • 7bl. System displays a message that an Application error has happened.
    　
  • 7b2. User is taken back to the Main Menu, and default controls are restored
    　
• 7c. User selects a button that has previously been selected in this configuration
  　
  • 7cl. System displays a message that the button already exists in this configuration.
    　
  • 7c2. System prompts User for new selection.
    　

Technology and Data Variation:
None
　

Related Information:
PacMan Use Case 9 Collaboration Diagram
PacMan Use Case 8 and 9 Class Diagram
PacMan Package Diagram
Pac Man Use Case Model