version 2/101030 by Erik Temple
Chapter: The map and the interface with the Automap extension
The map displayed by GLAM is actually generated by Mark Tilford's Automap extension. Automap provides data in the form of a gridded set of tile numbers. These tile numbers could be rendered in many ways; in fact, Automap provides translation tables to allow the same set of numbers to display a map with Infocom's Font3, with ASCII text, or with Unicode text. Glimmr Automap intercepts Automap's default behavior, which is to print the map to an expanded status line, and draws it using the "map-renderer" g-element. (The map-renderer is a specially made g-element that works similarly to an image-map.)
See the documentation for Automap by Mark Tilford for commands that can be used to change the way the map is generated--mapping rooms in particular places, for example, or changing how mapping is handled for rooms with closed doors.