The Xdataviewer Programmer's and User's Guide

This report describes in detail all the features of the Xdataviewer, a software graphical package developed in the CERN/SL Division and widely used in the LEP and SPS Control Rooms.Goal of the Xdataviewer is to help the Application Programmers to present numerical data both in graphical or in alphanumerical format, and Users to look at these data and to possibly interact with them. Sophisticated built-in Zoom and Data Editing capabilities are implemented, as well as a flexible Data Output generation facility. A complete C Callable Interface is provided, including routines to inform the Application Program about the User's interaction with the displayed data. The data to be displayed, formatted using the MOPS[1] formalism, can be contained in a Unix shared memory, or in a file, or can be found on the Web. The package has been written in C on a Unix HP_UX platform, making use of the standard X Window libraries (Xlib, Xt, Motif). It can be either run as a stand alone process, or it can be embedded in the Application Program itself.