1 /*- 2 * Copyright (c) 1983 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.proprietary.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)line.c 4.3 (Berkeley) 02/10/93"; 10 #endif /* not lint */ 11 12 #include "con.h" 13 line(x0,y0,x1,y1){ 14 iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1))); 15 return; 16 } 17 cont(x0,y0){ 18 iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0))); 19 return; 20 } 21 iline(cx0,cy0,cx1,cy1){ 22 int maxp,tt,j,np; 23 char chx,chy; 24 float xd,yd; 25 double dist2(),sqrt(); 26 movep(cx0,cy0); 27 maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.; 28 xd = cx1-cx0; 29 yd = cy1-cy0; 30 if(xd >= 0)chx = RIGHT; 31 else chx = LEFT; 32 if(yd >= 0)chy = UP; 33 else chy = DOWN; 34 if(maxp==0){ 35 xd=0; 36 yd=0; 37 } 38 else{ 39 xd /= maxp; 40 yd /= maxp; 41 } 42 inplot(); 43 for (tt=0; tt<=maxp; tt++){ 44 j= cx0+xd*tt-xnow; 45 xnow += j; 46 j = abval(j); 47 while(j-- > 0)spew(chx); 48 j = cy0+yd*tt-ynow; 49 ynow += j; 50 j = abval(j); 51 while(j-- > 0)spew(chy); 52 spew ('.'); 53 } 54 outplot(); 55 return; 56 } 57