66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
static char sccsid[] = "@(#)75 1.1 src/bos/usr/ccs/lib/lib450/line.c, libt450, bos411, 9428A410j 9/30/89 15:47:01";
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/*
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* COMPONENT_NAME: libplot
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*
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* FUNCTIONS: line, cont, iline
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*
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* ORIGINS: 4,10,27
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*
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* This module contains IBM CONFIDENTIAL code. -- (IBM
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* Confidential Restricted when combined with the aggregated
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* modules for this product)
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* SOURCE MATERIALS
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* (C) COPYRIGHT International Business Machines Corp. 1985, 1989
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* All Rights Reserved
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*
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* US Government Users Restricted Rights - Use, duplication or
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* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
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*
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*/
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#include "con.h"
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line(x0,y0,x1,y1){
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iline(xconv(xsc(x0)),yconv(ysc(y0)),xconv(xsc(x1)),yconv(ysc(y1)));
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return;
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}
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cont(x0,y0){
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iline(xnow,ynow,xconv(xsc(x0)),yconv(ysc(y0)));
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return;
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}
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iline(cx0,cy0,cx1,cy1){
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int maxp,tt,j,np;
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char chx,chy;
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float xd,yd;
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float dist2(),sqrt();
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movep(cx0,cy0);
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maxp = sqrt(dist2(cx0,cy0,cx1,cy1))/2.;
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xd = cx1-cx0;
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yd = cy1-cy0;
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if(xd >= 0)chx = RIGHT;
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else chx = LEFT;
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if(yd >= 0)chy = UP;
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else chy = DOWN;
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if(maxp == 0){
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xd=0;
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yd=0;
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}
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else{
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xd /=maxp;
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yd /=maxp;
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}
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inplot();
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for (tt=0; tt<=maxp; tt++){
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j= cx0+xd*tt-xnow;
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xnow += j;
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j = abval(j);
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while(j-- > 0)spew(chx);
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j = cy0+yd*tt-ynow;
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ynow += j;
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j = abval(j);
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while(j-- > 0)spew(chy);
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spew ('.');
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}
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outplot();
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return;
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}
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