1*5b2ba9d3SPiotr Jasiukajtis /* 2*5b2ba9d3SPiotr Jasiukajtis * CDDL HEADER START 3*5b2ba9d3SPiotr Jasiukajtis * 4*5b2ba9d3SPiotr Jasiukajtis * The contents of this file are subject to the terms of the 5*5b2ba9d3SPiotr Jasiukajtis * Common Development and Distribution License (the "License"). 6*5b2ba9d3SPiotr Jasiukajtis * You may not use this file except in compliance with the License. 7*5b2ba9d3SPiotr Jasiukajtis * 8*5b2ba9d3SPiotr Jasiukajtis * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5b2ba9d3SPiotr Jasiukajtis * or http://www.opensolaris.org/os/licensing. 10*5b2ba9d3SPiotr Jasiukajtis * See the License for the specific language governing permissions 11*5b2ba9d3SPiotr Jasiukajtis * and limitations under the License. 12*5b2ba9d3SPiotr Jasiukajtis * 13*5b2ba9d3SPiotr Jasiukajtis * When distributing Covered Code, include this CDDL HEADER in each 14*5b2ba9d3SPiotr Jasiukajtis * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5b2ba9d3SPiotr Jasiukajtis * If applicable, add the following below this CDDL HEADER, with the 16*5b2ba9d3SPiotr Jasiukajtis * fields enclosed by brackets "[]" replaced with your own identifying 17*5b2ba9d3SPiotr Jasiukajtis * information: Portions Copyright [yyyy] [name of copyright owner] 18*5b2ba9d3SPiotr Jasiukajtis * 19*5b2ba9d3SPiotr Jasiukajtis * CDDL HEADER END 20*5b2ba9d3SPiotr Jasiukajtis */ 21*5b2ba9d3SPiotr Jasiukajtis /* 22*5b2ba9d3SPiotr Jasiukajtis * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23*5b2ba9d3SPiotr Jasiukajtis */ 24*5b2ba9d3SPiotr Jasiukajtis /* 25*5b2ba9d3SPiotr Jasiukajtis * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26*5b2ba9d3SPiotr Jasiukajtis * Use is subject to license terms. 27*5b2ba9d3SPiotr Jasiukajtis */ 28*5b2ba9d3SPiotr Jasiukajtis 29*5b2ba9d3SPiotr Jasiukajtis /* 30*5b2ba9d3SPiotr Jasiukajtis * atan2pi(x) = atan2(x)/pi 31*5b2ba9d3SPiotr Jasiukajtis */ 32*5b2ba9d3SPiotr Jasiukajtis 33*5b2ba9d3SPiotr Jasiukajtis #include "libm.h" 34*5b2ba9d3SPiotr Jasiukajtis 35*5b2ba9d3SPiotr Jasiukajtis static const double invpi = 0.3183098861837906715377675; 36*5b2ba9d3SPiotr Jasiukajtis 37*5b2ba9d3SPiotr Jasiukajtis double atan2pi(double y,double x)38*5b2ba9d3SPiotr Jasiukajtisatan2pi(double y, double x) { 39*5b2ba9d3SPiotr Jasiukajtis int ix, iy; 40*5b2ba9d3SPiotr Jasiukajtis 41*5b2ba9d3SPiotr Jasiukajtis if (x == 0.0 && y == 0.0) { 42*5b2ba9d3SPiotr Jasiukajtis ix = ((int *)&x)[HIWORD]; 43*5b2ba9d3SPiotr Jasiukajtis iy = ((int *)&y)[HIWORD]; 44*5b2ba9d3SPiotr Jasiukajtis if (ix >= 0) 45*5b2ba9d3SPiotr Jasiukajtis return (y); 46*5b2ba9d3SPiotr Jasiukajtis return ((iy >= 0)? 1.0 : -1.0); 47*5b2ba9d3SPiotr Jasiukajtis } 48*5b2ba9d3SPiotr Jasiukajtis return (atan2(y, x) * invpi); 49*5b2ba9d3SPiotr Jasiukajtis } 50