The CERN Format

Map files written using the CERN format contain four keywords: default, circle, rectangle and polygon. These can be abbreviated as def, circ, rect, and poly. When a user makes a selection, shapes are checked in the order they appear in the file. The beginning of each line is checked for a keyword along with its appropriate syntax:

default URL

The default URL must always be set.

circle (x,y) r URL

Circle is defined by its center point (x,y) and its radius r.

rectangle (x1,y1) (x2,y2) URL

Rectangle is defined by the coordinates of its top-left (x1,y1) and bottom-right (x2,y2) corners.

polygon (x1,y1) ... (xn,yn) URL

Polygon is defined by a list of its vertices, with its first and last connected.

A URL can be either a full URL (access method, host name, and path) or a partial URL. A partial URL must always begin with a slash, and refers to a URL on the local host.

Example

The file cern-shapes.cern-map specifies the configuration information for this image-map.

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