Graph# Code

-- Removed State pattern from the Command Package in the detailed design
document.
-- Reason: Doesn't actually exist at the implementation level.

-- Performed Misc. Code cleanup.

-- Attempted to make all edges directed, but gave up on the idea.
-- Reason: WPF makes it more trouble than it's worth. After all, this is
really just supposed to be a quick fix-me until the underlying problem
of all edges not being undirected is fixed.
-- Abstracted out common code in the EdgeBuilder.BuildEdge() if-else
branch of code.

-- Implemented UC61 up until the point that the edge actually gets moved
-- Reason not complete: Edge.Source and Edge.Target are read-only properties.

-- Removed Sandbox.ExecutingCommands.
-- Reason: unneeded.

-- Renamed the OnVertexInstanceMouseLeftButtonDown / up events to
Start / FinishEdgeCreation.
-- Reason: Creates an ambiguity between events in LogicalEvents and
CreationalEvents.
-- Continued implementing UC61.

-- Implemented the Vertex highlighting and unhighlighting features for UC61.

-- Committed stubborn file that refuses to be committed the normal way.

-- Modified EdgeBuilder to add new events to built edgePaths for
UC61.
-- Added a class called Sandbox.
-- Purpose: provide a uniform location to place state-related data.

-- Started implementing UC61