arc.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 40 行

#ifndef lint
static char SccsId[] = " @(#)arc.c	4.1	(ULTRIX)	7/2/90";
#endif not(lint)

/*
 * Modification History
 *
 * 	April-11-1989, Pradeep Chetal
 *	Added changes from 4.3Tahoe BSD for lots of new drivers
 */

/*
 * Copyright (c) 1980, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)arc.c	6.1 (Berkeley) 8/29/86";
#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;
}