75 lines
1.4 KiB
C
75 lines
1.4 KiB
C
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ident "$Revision: 1.2 $"
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#include "con.h"
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#include "math.h"
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/* external declarations */
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extern int xconv(int);
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extern int yconv(int);
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extern int xsc(int);
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extern int ysc(int);
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extern void movep(int, int);
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extern void inplot(void);
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extern int abval(int);
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extern void spew(int);
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extern void outplot(void);
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extern float dist2(int, int, int, int);
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/* foward declarations */
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void iline(int, int, int, int);
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void
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line(int x0, int y0, int x1, int y1)
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{
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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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void
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cont(int x0, int y0)
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{
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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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void
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iline(int cx0, int cy0, int cx1, int cy1)
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{
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int maxp,tt,j,np;
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char chx,chy,command;
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float xd,yd;
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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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command = COM|((xd<0)<<1)|(yd<0);
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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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spew(command);
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for (tt=0; tt<=maxp; tt++){
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chx= cx0+xd*tt-xnow;
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xnow += chx;
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chx = abval(chx);
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chy = cy0+yd*tt-ynow;
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ynow += chy;
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chy = abval(chy);
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spew(ADDR|chx<<3|chy);
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}
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outplot();
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return;
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}
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