AbstractOverlay Class

Parent for all Overlay types. The core concept with an Overlay is that of its location, which is specified as follows:

Connectors

- 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 0.5.

Endpoints

- An array of two values which are proportional to the width and height of the Endpoint.

For Endpoints, the default value is [0.5, 0.5].