1*d30dc8cbSJohn Marino /* mpc_proj -- projection of a complex number onto the Riemann sphere.
2*d30dc8cbSJohn Marino
3*d30dc8cbSJohn Marino Copyright (C) 2008, 2009, 2011 INRIA
4*d30dc8cbSJohn Marino
5*d30dc8cbSJohn Marino This file is part of GNU MPC.
6*d30dc8cbSJohn Marino
7*d30dc8cbSJohn Marino GNU MPC is free software; you can redistribute it and/or modify it under
8*d30dc8cbSJohn Marino the terms of the GNU Lesser General Public License as published by the
9*d30dc8cbSJohn Marino Free Software Foundation; either version 3 of the License, or (at your
10*d30dc8cbSJohn Marino option) any later version.
11*d30dc8cbSJohn Marino
12*d30dc8cbSJohn Marino GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
13*d30dc8cbSJohn Marino WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14*d30dc8cbSJohn Marino FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15*d30dc8cbSJohn Marino more details.
16*d30dc8cbSJohn Marino
17*d30dc8cbSJohn Marino You should have received a copy of the GNU Lesser General Public License
18*d30dc8cbSJohn Marino along with this program. If not, see http://www.gnu.org/licenses/ .
19*d30dc8cbSJohn Marino */
20*d30dc8cbSJohn Marino
21*d30dc8cbSJohn Marino #include "mpc-impl.h"
22*d30dc8cbSJohn Marino
23*d30dc8cbSJohn Marino int
mpc_proj(mpc_ptr a,mpc_srcptr b,mpc_rnd_t rnd)24*d30dc8cbSJohn Marino mpc_proj (mpc_ptr a, mpc_srcptr b, mpc_rnd_t rnd)
25*d30dc8cbSJohn Marino {
26*d30dc8cbSJohn Marino if (mpc_inf_p (b)) {
27*d30dc8cbSJohn Marino /* infinities project to +Inf +i* copysign(0.0, cimag(z)) */
28*d30dc8cbSJohn Marino mpfr_set_inf (mpc_realref (a), +1);
29*d30dc8cbSJohn Marino mpfr_set_zero (mpc_imagref (a), (mpfr_signbit (mpc_imagref (b)) ? -1 : 1));
30*d30dc8cbSJohn Marino return MPC_INEX (0, 0);
31*d30dc8cbSJohn Marino }
32*d30dc8cbSJohn Marino else
33*d30dc8cbSJohn Marino return mpc_set (a, b, rnd);
34*d30dc8cbSJohn Marino }
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