Keywords: greg

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## Philosophy

GREG is a graphic utility package whose goal is to help people prepare plots of their data or of the results of theoretical computations. Major goals were device independence as much as possible `AND` efficient interactive use. It was kept in mind that drawings are usually prepared interactively and then the final result is sent to a good quality printer or saved for later use. Quick look on data is also often wanted. Hence, the design goals were both a simple, fast utility for simple things and a powerful, flexible system producing high quality plots. In addition, it was soon realised that a stand-alone utility was unadapted for complex, repetitive integrated plots as often required in theoretical modelling. Accordingly, the library version became part of the design goals.

With the advent of the X-Window system, GREG has been totally rewritten to take advantage of the multi-window and color facilities of X-Window. This new version also handles bitmap display of images, contour filling, etc..., with hardcopy facilities on PostScript devices.