line.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.2 */
/*LINTLIBRARY*/
#include <stdlib.h>
#include <math.h>
#include "con.h"
short xnow, ynow;
static void
iline(short cx0, short cy0, short cx1, short cy1)
{
int maxp, tt;
short j;
char chx, chy;
float xd, yd;
movep(cx0, cy0);
maxp = (int)(sqrt(dist2(cx0, cy0, cx1, cy1)) / 2.);
xd = cx1 - cx0;
yd = cy1 - cy0;
if (xd >= 0)
chx = RIGHT;
else chx = LEFT;
if (yd >= 0)
chy = UP;
else chy = DOWN;
if (maxp == 0) {
xd = 0;
yd = 0;
} else {
xd /= maxp;
yd /= maxp;
}
inplot();
for (tt = 0; tt <= maxp; tt++) {
j = (short)(cx0 + xd * tt - xnow);
xnow += j;
j = abs(j);
while (j-- > 0)
spew(chx);
j = (short)(cy0 + yd * tt - ynow);
ynow += j;
j = abs(j);
while (j-- > 0)
spew(chy);
spew('.');
}
outplot();
}
void
line(short x0, short y0, short x1, short y1)
{
iline(xconv(xsc(x0)), yconv(ysc(y0)),
xconv(xsc(x1)), yconv(ysc(y1)));
}
void
cont(short x0, short y0)
{
iline(xnow, ynow, xconv(xsc(x0)), yconv(ysc(y0)));
}