From 85ae256512291bbd7163f7bd1eb9dd4e6f4a9306 Mon Sep 17 00:00:00 2001
From: Sam Leffler <sam@ucbvax.Berkeley.EDU>
Date: Mon, 27 Jun 1983 21:16:36 -0800
Subject: [PATCH] date and time created 83/06/27 14:16:36 by sam

SCCS-vsn: lib/libplot/t300s/subr.c 4.1
---
 usr/src/lib/libplot/t300s/subr.c | 160 +++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 usr/src/lib/libplot/t300s/subr.c

diff --git a/usr/src/lib/libplot/t300s/subr.c b/usr/src/lib/libplot/t300s/subr.c
new file mode 100644
index 0000000000..e399a26033
--- /dev/null
+++ b/usr/src/lib/libplot/t300s/subr.c
@@ -0,0 +1,160 @@
+#ifndef lint
+static char sccsid[] = "@(#)subr.c	4.1 (Berkeley) %G%";
+#endif
+
+#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);
+}
-- 
2.20.1