man(1) Manual page archive

     plot: tek, gsip, vt0 - graphics filters

     source | tek
     source | gsip
     source | vt0

     These commands produce graphical output on the Tektronix
     4014 terminal, the GSI or other Diablo-mechanism terminals,
     and the on-line storage scope respectively.  They read the
     standard input to obtain plotting instructions, which are
     usually generated by a program calling the graphics subrou-
     tines described in plot (VII).  Each instruction consists of
     an ASCII letter usually followed by binary information.  A
     plotting coordinate is transmitted as four bytes represent-
     ing the x and y values; each value is a signed number trans-
     mitted low-order byte first.  The assumed plotting space is
     set by request.  The instructions are taken from

     m  move: the next four bytes specify the coordinates of a
        point to move to.  This is used before writing a label.

     p  point: the next four bytes specify the coordinates at
        which a point is drawn.

     l  line: the next eight bytes are taken as two pairs of
        coordinates specifying the endpoints of a line to be

     t  label: the bytes up to a new-line are written as ASCII
        starting at the last point drawn or moved to.

     a  arc: the first four bytes specify the center, the next
        four specify the starting point, and the last four spec-
        ify the end point of a circular arc.  The least signifi-
        cant coordinate of the end point is used only to deter-
        mine the quadrant.  The arc is drawn counter-clockwise.
        This command is not necessarily implemented on all (or
        even any) of the output devices.

     c  circle: The first four bytes specify the center of the
        circle, the next two the radius.

     e  erases the screen

     f  linemod: takes the following string as the type for all
        future lines.  The types are `dotted,' `solid,' `long-
        dashed,' `shortdashed,' and `dotdashed.'  This instruc-
        tion is effective only with the Tektronix terminal.


     d  dotline: takes the first four bytes as the coordinates of
        the beginning of a dotted line.  The next two are a
        signed x-increment, and the next two are a word count.
        Following are the indicated number of byte-pairs repre-
        senting words.  For each bit in this list of words a
        point is plotted which is visible if the bit is `1,'
        invisible if not.  Each point is offset rightward by the
        x-increment.  The instruction is effective only on the
        vt0 scope.

     plot (VII), graph (VI)