Content Image Hotspots

Purpose

This module provides an extensible way to allow images to have buttons that
trigger overlays. It supplies a field type that can be added anywhere you can
add and render fields.

Link Types

To create your own type of link you will need to register it with a hook and
create your form and display functions.

Currently supported are:

• Filtered Text
• Entity Reference

Limitations

• Cardinality on the field must be one due to AJAX interface design. New
  instances of this field would not have a ID associated with it, so for
  now the field uses a generated UUID to reference
  it's hotspots.