Thread Arcs
When a message is selected a thread map appears providing a visualization
of the message's response hierarchy. The currently selected message,
along with arcs to its parent and children, are highlighted with blue.
Unread messages are indicated with a black border. Messages that the
user has sent are hollow. Our design maintains compactness with either
deep or wide trees, while clearly displaying chronological order (older
messages are drawn to the left). A full description of Thread Arcs design is described in detail in the
THREAD ARCS: An Email Thread Visualization publication.
