is an option for graphics functions which gives a list of graphics primitives to be rendered before the main part of the graphics is rendered.
- Graphics primitives specified by Prolog are rendered after axes, boxes, and frames are rendered.
- In three-dimensional graphics, two-dimensional graphics primitives can be specified by the Prolog option. The graphics primitives are rendered in a 0, 1 coordinate system.
- Directives specified by Prolog affect only the prolog, and not other contents of a graphic.
Introduced in 1991