The GROMA program allows work with simple graphics. You have to open a special window for drawing where you can perform the basic graphic actions above the coordinate list. There are 64 levels available to store graphic elements. These levels can be arbitrarily switched on and off in the individual projections.
The graphic files (.pic), ) in which the graphics are saved contain only the drawing prescription (information on the graphic elements and numbers of their end points). Such graphic files have certain advantages and disadvantages.
Advantages:
The graphic files use the standard coordinate list; the changes in the coordinates of the points are reflected immediately in the graphics (the coordinates transformation also can be performed after which the drawing remains unchanged, it will only adjust to the new coordinates),
Keeping just one coordinate list results in a significant savings of disc and memory space (only the connection lines between the points are stored in the file, the graphic file with all the points is therefore, in fact, empty).
Disadvantages:
The drawing is lost while changing the point numbers,
The graphic elements can only be placed on already existing points.