date and time created 83/06/27 14:19:28 by sam

[unix-history] / usr / src / lib / libplot / t4014 / subr.c

#ifndef lint
static char sccsid[] = "@(#)subr.c      4.1 (Berkeley) %G%";
#endif

#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);
}