NAME

plot: tek, gsip, vt0 − graphics filters

SYNOPSIS

source | tek
source | gsip
source | vt0

DESCRIPTION

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 subroutines described in plot (VII).  Each instruction consists of an ASCII letter usually followed by binary information.  A plotting coordinate is transmitted as four bytes representing the x and y values; each value is a signed number transmitted low-order byte first.  The assumed plotting space is set by request.  The instructions are taken from

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

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

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

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

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

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

eerases the screen

flinemod: takes the following string as the type for all future lines.  The types are ‘dotted,’ ‘solid,’ ‘longdashed,’ ‘shortdashed,’ and ‘dotdashed.’ This instruction is effective only with the Tektronix terminal. 

ddotline: 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 representing 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. 

SEE ALSO

plot (VII), graph (VI)

BUGS