4.4BSD/usr/src/lib/libplot/grn/arc.c

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/*-
 * Copyright (c) 1980, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This module is believed to contain source code proprietary to AT&T.
 * Use and redistribution is subject to the Berkeley Software License
 * Agreement and your Software Agreement with AT&T (Western Electric).
 */

#ifndef lint
static char sccsid[] = "@(#)arc.c	8.1 (Berkeley) 6/4/93";
#endif /* not lint */

#include "grnplot.h"

arc(x,y,x0,y0,x1,y1)
{
	extern double atan2();

	if (!ingrnfile) erase();
	endvector();
	printf("ARC\n");
	outxy(x,y);
	outxy(x0,y0);
	outxy(x1,y1);
	printf("*\n%d %d\n0\n",
	    linestyle,(int) (atan2(x1-x,y1-y)-atan2(x0-x,y0-y)));
	curx =x;
	cury =y;
}