CIGAL Reference Manual, Chapter 6 (RealTime): r_bdraw
usage: r_bdraw opflg eflag ltime Intensity Box
R_BDRAW is a REALTIME operator. It draws an unfilled rectangle on the screen. The color is determined by the INTENSITY value, which will be mapped through the active color lookup table to produce a color. The size and position are determined by the BOX argument, which is a short integer array specifying a screen region (4 values: left, top, right, bottom).
See Also:
CIGAL Home,
CIGAL Manual,
RealTime List,
Manual Help