Wave.cpp

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/*
--------------------------------------------------------------------------------
This source file is part of Hydrax.
Visit http://www.ogre3d.org/tikiwiki/Hydrax
 
Copyright (C) 2011 Jose Luis Cercós Pita <jlcercos@gmail.com>
 
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
 
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
--------------------------------------------------------------------------------
*/
 
// ----------------------------------------------------------------------------
// Include the main header
// ----------------------------------------------------------------------------
#include <Wave.h>
 
// ----------------------------------------------------------------------------
// Include Hydrax
// ----------------------------------------------------------------------------
#include <Hydrax.h>
 
#define _def_PackedNoise true
 
using namespace Hydrax::Noise;
 
Wave::Wave(Ogre::Vector2 dir, float A, float T, float p)
    : mTime(0)
    , mDir(dir)
    , mA(A)
    , mT(T)
    , mP(p)
{
    mDir.normalise();
    mL = 1.5625f*mT*mT;
    mC = 1.25f*sqrt(mL);
    mF = 2.f*M_PI/mT;
    mK = 2.f*M_PI/mL;
}
 
Wave::~Wave()
{
}
 
void Wave::update(const Ogre::Real &timeSinceLastFrame)
{
    mTime += timeSinceLastFrame;
}
 
float Wave::getValue(const float &x, const float &y)
{
    float X = mDir.x*x + mDir.y*y;
    return mA * sin(mF*mTime - mK*X + mP);
}