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# csgeom/math.h

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    00001 /*
    00002   Copyright (C) 2005 by Marten Svanfeldt
    00003
    00004   This library is free software; you can redistribute it and/or
    00005   modify it under the terms of the GNU Library General Public
    00006   License as published by the Free Software Foundation; either
    00007   version 2 of the License, or (at your option) any later version.
    00008
    00009   This library is distributed in the hope that it will be useful,
    00010   but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00012   Library General Public License for more details.
    00013
    00014   You should have received a copy of the GNU Library General Public
    00015   License along with this library; if not, write to the Free
    00016   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00017 */
    00018
    00019 #ifndef __CS_MATH_H__
    00020 #define __CS_MATH_H__
    00021
    00032 template<class T>
    00033 const T& csMax (const T& a, const T& b)
    00034 {
    00035   if (a >= b) return a;
    00036   return b;
    00037 }
    00038
    00042 template<class T>
    00043 const T& csMin (const T& a, const T& b)
    00044 {
    00045   if (a < b) return a;
    00046   return b;
    00047 }
    00048
    00049
    00053 template<class T>
    00054 T csClamp (const T& a, T max, T min)
    00055 {
    00056   return csMin (csMax (a, min), max);
    00057 }
    00058
    00064 template<class T>
    00065 T csSmoothStep (const T& a, T max, T min)
    00066 {
    00067   T tmp, tmp2;
    00068   if (a <= min)
    00069     tmp = 0.0f;
    00070   else if (a >= max)
    00071     tmp = 1.0f;
    00072   else
    00073   {
    00074     tmp2 = (a - min) / (max-min);
    00075     tmp = tmp2*tmp2 * (3.0 - 2.0*tmp2);
    00076   }
    00077   return tmp;
    00078 }
    00079
    00083 template<class T>
    00084 T csSquare (const T& x)
    00085 {
    00086   return x * x;
    00087 }
    00088
    00091 #endif //__CS_MATH_H__