1 // exponent.cpp
2 //
3 // Copyright (C) 2003, 2004 Jason Bevins
4 //
5 // This library is free software; you can redistribute it and/or modify it
6 // under the terms of the GNU Lesser General Public License as published by
7 // the Free Software Foundation; either version 2.1 of the License, or (at
8 // your option) any later version.
9 //
10 // This library is distributed in the hope that it will be useful, but WITHOUT
11 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
13 // License (COPYING.txt) for more details.
14 //
15 // You should have received a copy of the GNU Lesser General Public License
16 // along with this library; if not, write to the Free Software Foundation,
17 // Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 //
19 // The developer's email is jlbezigvins@gmzigail.com (for great email, take
20 // off every 'zig'.)
21 //
22
23 #include "exponent.h"
24
25 using namespace noise::module;
26
Exponent()27 Exponent::Exponent ():
28 Module (GetSourceModuleCount ()),
29 m_exponent (DEFAULT_EXPONENT)
30 {
31 }
32
GetValue(double x,double y,double z) const33 double Exponent::GetValue (double x, double y, double z) const
34 {
35 assert (m_pSourceModule[0] != NULL);
36
37 double value = m_pSourceModule[0]->GetValue (x, y, z);
38 return (pow (fabs ((value + 1.0) / 2.0), m_exponent) * 2.0 - 1.0);
39 }
40