2.11BSD/src/usr.lib/libplot/t4013/subr.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)subr.c	5.1 (Berkeley) 6/7/85";
#endif not lint

#include <stdio.h>
float obotx = 0.;
float oboty = 0.;
float botx = 0.;
float boty = 0.;
float scalex = 1.;
float scaley = 1.;
int scaleflag;

int oloy = -1;
int ohiy = -1;
int ohix = -1;
cont(x,y){
	int hix,hiy,lox,loy;
	int n;
	x = (x-obotx)*scalex + botx;
	y = (y-oboty)*scaley + boty;
	hix=(x>>5) & 037;
	hiy=(y>>5) & 037;
	lox = x & 037;
	loy = y & 037;
	n = (abs(hix-ohix) + abs(hiy-ohiy) + 6) / 12;
	if(hiy != ohiy){
		putch(hiy|040);
		ohiy=hiy;
	}
	if(hix != ohix){
		putch(loy|0140);
		putch(hix|040);
		ohix=hix;
		oloy=loy;
	}
	else if(loy != oloy){
		putch(loy|0140);
		oloy=loy;
	}
	putch(lox|0100);
	while(n--)
		putch(0);
}

putch(c){
	putc(c,stdout);
}