V7/usr/src/libplot/vt0.c.a

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including files from this version of Unix. 
earc.c<
E]extern vti;
arc(xi,yi,x0,y0,x1,y1){
	char c;
	c = 6;
	write(vti,&c,1);
	write(vti,&xi,12);
}
circle.c<
ERextern vti;
circle(x,y,r){
	char c;
	c = 5;
	write(vti,&c,1);
	write(vti,&x,6);
}
close.c<
E@extern vti;
closevt(){
	close(vti);
}
closepl(){
	close(vti);
}
dot.c<
Eextern vti;
dot(xi,yi,dx,n,pat)
int pat[];
{
	struct {char pad,c; int xi,yi,dx;} p;
	p.c = 7;
	p.xi = xsc(xi);
	p.yi = ysc(yi);
	p.dx = xsc(dx);
	write(vti,&p.c,7);
	write(vti,pat,n?n&0377:256);
}
erase.c<
E:extern vti;
erase(){
	int i;
	i=0401;
	write(vti,&i,2);
}
frame.c<
E?frame(n)
{
	extern vti;
	n=n&0377 | 02000;
	write(vti,&n,2);
}
clabel.c<
Ezextern vti;

label(s)
char *s;
{
	int i, o;

	o = 01401;
	write(vti, &o, 2);
	for(i=0; s[i++]; )
		;
	write(vti, s, i);
}
line.c<
Eextern vti;
extern xnow,ynow;
line(x0,y0,x1,y1){
	struct{char x,c; int x0,y0,x1,y1;} p;
	p.c = 3;
	p.x0 = xsc(x0);
	p.y0 = ysc(y0);
	p.x1 = xnow = xsc(x1);
	p.y1 = ynow = ysc(y1);
	write(vti,&p.c,9);
}
cont(x0,y0){
	line(xnow,ynow,xsc(x0),ysc(y0));
	return;
}
move.c<
Fextern vti;
extern xnow,ynow;
move(xi,yi){
	struct {char pad,c; int x,y;} p;
	p.c = 9;
	p.x = xnow = xsc(xi);
	p.y = ynow = ysc(yi);
	write(vti,&p.c,5);
}

open.c<
Eint xnow;
int ynow;
float boty 0.;
float botx 0.;
float oboty 0.;
float obotx 0.;
float scalex 1.;
float scaley 1.;
int vti -1;

openvt ()
{
		vti = open("/dev/vt0",1);
		return;
}
openpl()
{
	vti = open("/dev/vt0",1);
	return;
}
point.c<
Eextern vti;
extern xnow,ynow;
point(xi,yi){
	struct {char pad,c; int x,y;} p;
	p.c = 2;
	p.x = xnow = xsc(xi);
	p.y = ynow =  ysc(yi);
	write(vti,&p.c,5);
}
espace.c<
Eextern float boty;
extern float botx;
extern float oboty;
extern float obotx;
extern float scalex;
extern float scaley;
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);
}
csubr.c<
Eextern float obotx;
extern float oboty;
extern float boty;
extern float botx;
extern float scalex;
extern float scaley;
xsc(xi){
	int xa;
	xa = (xi-obotx)*scalex+botx;
	return(xa);
}
ysc(yi){
	int ya;
	ya = (yi-oboty)*scaley+boty;
	return(ya);
}
linmod.c<
Elinemod(s)
char *s;
{
}
box.c	rbox(x0, y0, x1, y1)
{
	move(x0, y0);
	cont(x0, y1);
	cont(x1, y1);
	cont(x1, y0);
	cont(x0, y0);
	move(x1, y1);
}