7. UNUSUAL FEATURES OF THE PROGRAM
Version-1: draws axonometric 3D graphs, while simultaneously
generating intermediate (x,y,z) points for filling,
smoothening, etc., on a monochrome graphics terminal or a pen plotter.
Version-2: is a slight improvement on version-1.
Version-3: has several additional features useful for drawing 3D
maps, stereo 3D graphs, and perspective 3D layout
Version-4: displays multicolour contour plots and 3D graphs having
colour coded heights. The colour legend can be
interactively and easily selected. Hard copy is obtaind
by dumping the screen contents on to a colour graphics
Version-5: is a fusion of version 3 and 4 in which all the graphics
call statements exist in form of comment lines "CA" and
"CB". It requires conditional compilation for selection
of either version.