/*
 * 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"

int ynow = 0;

static void
iline(int cx0, int cy0, int cx1, int cy1) {
	int maxp, tt;
	char chx, chy, command;
	float xd, yd;
	movep(cx0, cy0);
	maxp = (int)(sqrt(dist2(cx0, cy0, cx1, cy1)) / 2.);
	xd = cx1 - cx0;
	yd = cy1 - cy0;
	command = COM|((xd < 0) << 1)|(yd < 0);
	if (maxp == 0) {
		xd = 0;
		yd = 0;
	} else {
		xd /= maxp;
		yd /= maxp;
	}
	inplot();
	spew(command);
	for (tt = 0; tt <= maxp; tt++) {
		chx = (char)(cx0 + xd * tt - xnow);
		xnow += chx;
		chx = abs(chx);
		chy = (char)(cy0 + yd * tt - ynow);
		ynow += chy;
		chy = abs(chy);
		spew(ADDR|chx<<3|chy);
	}
	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)));
}