Parent for all Overlay types. The core concept with an Overlay is that of its
location, which is specified
- a value between 0 and 1 inclusive is a proportional value, relative to the length of the Connector's path. - a value greater than 1 or less than 0 is an absolute value (travel along the path inscribed by the Connector)
For Connectors, the default value is
- An array of two values which are proportional to the width and height of the Endpoint.
For Endpoints, the default value is