eÿarc.c         ­þé)¶  	 arc(){
}
 circle.c      ­þé)¶   circle(){
}
close.c       ­þé)¶  T #include <stdio.h>
closevt(){
	closepl();
}
closepl(){
	fflush(stdout);
	reset();
}
dot.c         ­ÿé)¶  	 dot(){
}
<erase.c       ­ÿé)¶  f #include "con.h"
erase(){
	int i;
		for(i=0; i<11*(VERTRESP/VERTRES); i++)
			spew(DOWN);
		return;
}
label.c       ­ÿé)¶  | #include "con.h"
label(s)
char *s;
{
	int i,c;
		while((c = *s++) != '\0'){
			xnow =+ HORZRES;
			spew(c);
		}
		return;
}
line.c        ­ÿé)¶  Ë#include "con.h"
line(x0,y0,x1,y1){
	iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
	return;
}
cont(x0,y0){
	iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
	return;
}
iline(cx0,cy0,cx1,cy1){
	int maxp,tt,j,np;
	char chx,chy,command;
	    float xd,yd;
	float dist2(),sqrt();
	movep(cx0,cy0);
	maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
	xd = cx1-cx0;
	yd = cy1-cy0;
	command = COM|((xd<0)<<1)|(yd<0);
	if(maxp == 0){
		xd=0;
		yd=0;
	}
	else {
		xd =/maxp;
		yd =/maxp;
	}
	inplot();
	spew(command);
	for (tt=0; tt<=maxp; tt++){
		chx= cx0+xd*tt-xnow;
		xnow =+ chx;
		chx = abval(chx);
		chy = cy0+yd*tt-ynow;
		ynow =+ chy;
		chy = abval(chy);
		spew(ADDR|chx<<3|chy);
	}
	outplot();
	return;
}
clinmod.c      ­ ê)¶   linemod(){
}
tmove.c        ­ ê)¶  A move(xi,yi){
		movep(xconv(xsc(xi)),yconv(ysc(yi)));
		return;
}
=open.c        ­@ê)¶  å#
/* gsi plotting output routines */
# define DOWN 012
# define UP 013
# define LEFT 010
# define RIGHT 040
# define BEL 007
# define ACK 006
# define CR 015
# define FF 014
# define VERTRESP 48
# define HORZRESP 60.
# define HORZRES 6.
# define VERTRES 8.
/* down is line feed, up is reverse oyne feed,
   left is bwckspace, right is space.  48 points per inch
   vertically, 60 horizontally */

int xnow, ynow;
int ITTY[3], PTTY[3], OUTF;
float HEIGHT 6.0, WIDTH 6.0, OFFSET 0.0;
int xscale, xoffset, yscale;
float botx 0., boty 0., obotx 0., oboty 0.;
float scalex 1., scaley 1.;

openpl ()
{
	int reset();
		xnow = ynow = 0;
		OUTF = 1;
		printf("\r");
		gtty(OUTF, ITTY);
		signal (2, &reset);
		PTTY[0] = ITTY[0];
		PTTY[1] = ITTY[1];
		PTTY[2] = ITTY[2] & (~ 020);  /* don't map lf */
		PTTY[2] =| 001; /* no delays */
		/* initialize constants */
		xscale  = 4096./(HORZRESP * WIDTH);
		yscale = 4096 /(VERTRESP * HEIGHT);
		xoffset = OFFSET * HORZRESP;
		return;
}

openvt(){
openpl();
}
 point.c       ­ê)¶  H #include "con.h"
point(xi,yi){
		move(xi,yi);
		label(".");
		return;
}
space.c       ­ê)¶  º # include "con.h"
float deltx 4095.;
float delty 4095.;
space(x0,y0,x1,y1){
	botx = -2047.;
	boty = -2047.;
	obotx = x0;
	oboty = y0;
	scalex = deltx/(x1-x0);
	scaley = delty/(y1-y0);
}
subr.c        ­ê)¶  µ#include <stdio.h>
#include "con.h"
abval(q)
{
	return (q>=0 ? q : -q);
}

xconv (xp)
{
	/* x position input is -2047 to +2047, output must be 0 to PAGSIZ*HORZRES */
	xp =+ 2048;
	/* the computation is newx = xp*(PAGSIZ*HORZRES)/4096 */
	return (xoffset + xp /xscale);
}

yconv (yp)
{
	/* see description of xconv */
	yp =+ 2048;
	return (yp / yscale);
}

inplot()
{
	stty(OUTF, PTTY);
	spew(ESC);
	spew (INPLOT);
}

outplot()
{
	spew(ESC);
	spew(ACK);
	spew(ESC);
	spew(ACK);
	fflush(stdout);
	stty (OUTF, ITTY);
}

spew(ch)
{
	putc(ch, stdout);
}

tobotleft ()
{
	move(-2048,-2048);
}
reset()
{
	outplot();
	exit();
}

float
dist2 (x1, y1, x2, y2)
{
	float t,v;
	t = x2-x1;
	v = y1-y2;
	return (t*t+v*v);
}

swap (pa, pb)
int *pa, *pb;
{
	int t;
	t = *pa;
	*pa = *pb;
	*pb = t;
}

#define DOUBLE 010
#define ADDR 0100
#define COM 060
#define MAXX 070
#define MAXY 07
extern xnow,ynow;
#define SPACES 7
movep(ix,iy){
	int dx,dy,remx,remy,pts,i;
	int xd,yd;
	int addr,command;
	char c;
	if(xnow == ix && ynow == iy)return;
	inplot();
	dx = ix-xnow;
	dy = iy-ynow;
	command = COM|PENUP|((dx<0)<<1)|(dy<0);
	dx = abval(dx);
	dy = abval(dy);
	xd = dx/(SPACES*2);
	yd = dy/(SPACES*2);
	pts = xd<yd?xd:yd;
	if((i=pts)>0){
		c=command|DOUBLE;
		addr=ADDR;
		if(xd>0)addr=|MAXX;
		if(yd>0)addr=|MAXY;
		spew(c);
		while(i--){
			spew(addr);
		}
	}
	if(xd!=yd){
		if(xd>pts){
			i=xd-pts;
			addr=ADDR|MAXX;
		}
		else{
			i=yd-pts;
			addr=ADDR|MAXY;
		}
		c=command|DOUBLE;
		spew(c);
		while(i--){
			spew(addr);
		}
	}
	remx=dx-xd*SPACES*2;
	remy=dy-yd*SPACES*2;
	addr=ADDR;
	i = 0;
	if(remx>7){
		i=1;
		addr=|MAXX;
		remx =- 7;
	}
	if(remy>7){
		i=1;
		addr=|MAXY;
		remy =- 7;
	}
	while(i--){
		spew(command);
		spew(addr);
	}
	if(remx>0||remy>0){
		spew(command);
		spew(ADDR|remx<<3|remy);
	}
	xnow=ix;
	ynow=iy;
	outplot();
	return;
}
xsc(xi){
	int xa;
	xa = (xi - obotx) * scalex + botx;
	return(xa);
}
ysc(yi){
	int ya;
	ya = (yi - oboty) *scaley +boty;
	return(ya);
}
Ocon.h         ­þé)¶  ä#
/* gsi plotting output routines */
# define DOUBLE 010
#define ADDR 0100
#define COM 060
#define PENUP 04
#define MAXX 070
#define MAXY 07
#define SPACES 7
# define DOWN 012
# define UP 013
# define LEFT 010
# define RIGHT 040
# define BEL 007
# define ESC 033
# define ACK 006
# define INPLOT 'P'
# define CR 015
# define FF 014
# define VERTRESP 48
# define HORZRESP 60.
# define VERTRES 8.
# define HORZRES 6.
/* down is line feed, up is reverse line feed,
   left is backspace, right is space.  48 points per inch
   vertically, 60 horizontally */

extern int xnow, ynow;
extern int ITTY[3], PTTY[3], OUTF;
extern float HEIGHT, WIDTH, OFFSET;
extern int xscale, xoffset, yscale;
extern float botx, boty, obotx, oboty, scalex,scaley;

box.c         ÏÕ	¶  r box(x0, y0, x1, y1)
{
	move(x0, y0);
	cont(x0, y1);
	cont(x1, y1);
	cont(x1, y0);
	cont(x0, y0);
	move(x1, y1);
}