Ultrix-3.1/src/libplot/t4014/subr.c

/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/*
 * SCCSID: @(#)subr.c	3.0	4/22/86
 */
#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;
int oextra = -1;
cont(x,y){
	int hix,hiy,lox,loy,extra;
	int n;
	x = (x-obotx)*scalex + botx;
	y = (y-oboty)*scaley + boty;
	hix=(x>>7) & 037;
	hiy=(y>>7) & 037;
	lox = (x>>2)&037;
	loy=(y>>2)&037;
	extra=x&03+(y<<2)&014;
	n = (abs(hix-ohix) + abs(hiy-ohiy) + 6) / 12;
	if(hiy != ohiy){
		putch(hiy|040);
		ohiy=hiy;
	}
	if(hix != ohix){
		if(extra != oextra){
			putch(extra|0140);
			oextra=extra;
		}
		putch(loy|0140);
		putch(hix|040);
		ohix=hix;
		oloy=loy;
	}
	else{
		if(extra != oextra){
			putch(extra|0140);
			putch(loy|0140);
			oextra=extra;
			oloy=loy;
		}
		else if(loy != oloy){
			putch(loy|0140);
			oloy=loy;
		}
	}
	putch(lox|0100);
	while(n--)
		putch(0);
}

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