Running the Applications

The main difference between producing X-window output and PostScript output is that there is no cursor available when using PostScript. This means, for instance, that you cannot use PICDEF in cursor mode, and you cannot use CURSOR at all! We made use of both these facilities when we produced Figure  8. Pictures must be defined using PICDEF in XY mode, or one of the other positional mode (CC, BL, etc.). Annotation such as produced by CURSOR can be created using LISTMAKE and LISTSHOW. You specify the reference positions for the annotation in any suitable co-ordinate Frame using LISTMAKE. This creates a positions list file containing these positions, together with associated WCS information. You then supply this file to LISTSHOW which marks the positions on the graphics device in any of the ways provided by CURSOR.