1. Algorithms, Data Structures and Interfaces of the UI
Presentation by Christian Hörwick

2. Introduction
No own Algorithms and Data Structures needed in the UI-Subsystem
This presentation will focus only on the interaction and information flow from and to UI-subsystem boundaries

3. 1. Interaction and Information flow to subsystem boundaries:
get message from Notification Center as soon as there are any changes
the messages indicate only what has changed but don't send data (pull)

4. 2. Interaction and Information flow from subsystem boundaries
Two protocols therefore needed:
a)UIOrchestra
b)UIObject

5. a)UIOrchestra Methods:
-(void)setTrackingContext : (NSOpenGLContext*)newContext
sets the new OpenGLContext which is used by Tracking subsystem
-(void)setOrchestraContext : (NSOpenGLContext*)newContext
sets the new OpenGLContext which is used by Video subsystem
-(UIObject*)getRootUIObject  returns the root-UIObject
The UI subsystem gets the UIOrchestra-Object from ApplicationController at the beginning

6. b) UIObject
Represents an Orchestra „Ensemble“-Object where the following methods can be used:
-(bool)hasChildren  shows if the UIObject has children (represents a musician group) or not (represents a single musician)
-(NSArray*)children  returns the children as an Array
-(bool)visible  shows if the UIObject is visible
-(Vector3f*)position  returns the position
-(Vector3f*)rotation  returns the rotation angles of x-, y- and z-axis

7. b)UIObject (cont.) -(NSString*)name  returns the name
-(NSString*)role  returns the role
-(UIObject*)rootObject  returns the root UIObject
-(NSArray*)allChildren  returns all UIObjects representing a single musician or a musician group which has no children
-(void)setPosition : (Vector3f*)position  sets the new position
-(void)setVolume : (float)volume sets the new volume

8. Thanks for your attention!