Ron, Edward, JohnR and I have formed a taskforce to hammer out the
details of creating a UI for Ptolemy 0 and Ptolemy II.

Below are my notes on the meeting we had.  I've decided that the first
Milestone we had was to large, and have broken it down into submilestones.

Overview
--------
The idea is that we come up with a milestone of something that can
easily be implemented.  The general goal is to create a UI for the
pt.kernel package in Ptolemy II.  The specific task is to be able
to draw Figure 8 from the design doc.  Figure 8 illustrates how
Entities can be connected.

See
http://ptolemy.eecs.berkeley.edu/~ptdesign/java/wmwork/design.fm.ancA3.gif

The GUI should allow the user to do most (if not all) operations that
the user could do through Tcl Blend

To do figure 8, we have several submilestones

Submilestone A: Simple Graph
-------------------------
The goal here is to create a simple graph with two entities
connected by a relation

- Specify as workspace
- Create and place Entities
- Create and place Relations
- Connect entities and Relations
- Create and Place Ports
  Ptolemy II has dynamic ports, where as Ptolemy 0 has static ports
  that are created at compile time.
- Perform operations on Entities such as deepGetConnectedEntities()
	In the short term, we could bring up a message dialog with the
	results
	In the long term, we might want to graphical highlight the
	results, or have a console View as part of the tool
- Persistance: How will simulations be stored
- Backend issues:  How will we have Tycho and Tcl Blend communicate?

Submilestone B: Port issues
------------------------
  - We should be able to:
	create and place an Entity
	add a Port
	delete a Port
	moving Ports is not part of this milestone
  - Handling multiple connections. We have no fork stars in Ptolemy II
  - Ports can change from Input to Output to both to neither. 


Submilestone C: Hierarchy
----------------------
- Support Hierarchy. 



What's not included in the first Milestone 
------------------------------------------
- The ability to move ports
- Level crossing links
- Connection constraints

	E --->R--->E
	      ^	
	E ----/
Is different from

	E --->R--->E
	           ^ 
	E --->R----/
(E = Entity, R = Relation)


What don't we need yet
----------------------
- Since there are very few graphical elements, we do not need icon
	libs yet.  We have
	Entities
	CompositeEntities
	Ports
	Relations 
	Wires
- Style library


Ptolemy 0
---------
Ptolemy 0 and Ptolemy II have very different policies.  However, we
may be able to use the Ptolemy II UI to interface to Ptolemy 0.
Once we get and interface to the Pt II kernel, then we can start on an
interface to the PN domain.  Once we have that, we can look at
interfacing to Ptolemy 0

-Christopher