BasicController.cpp

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/*
--------------------------------------------------------------------------------
This source file is part of SkyX.
Visit http://www.paradise-studios.net/products/skyx/
 
Copyright (C) 2009-2012 Xavier Verguín González <xavyiy@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 "BasicController.h"
 
namespace SkyX
{
    BasicController::BasicController(const bool& deleteBySkyX)
        : Controller(deleteBySkyX)
        , mTime(Ogre::Vector3(14.0f, 7.50f, 20.50f))
        , mSunDirection(Ogre::Vector3(0,1,0))
        , mMoonDirection(Ogre::Vector3(0,-1,0))
        , mEastDirection(Ogre::Vector2(0,1))
        , mMoonPhase(0)
    {
    }
 
    void BasicController::update(const Ogre::Real& simDeltaTime)
    {
        mTime.x += simDeltaTime;
 
        if (mTime.x > 24)
        {
            mTime.x -= 24;
        } 
        else if (mTime.x < 0)
        {
            mTime.x += 24;
        }
 
        // 24h day: 
        // 0______A(Sunrise)_______B(Sunset)______24
        //                     
 
        float y,
            X = mTime.x,
            A = mTime.y,
            B = mTime.z,
            AB  = A+24-B,
            AB_ = B-A,
            XB  = X+24-B;
 
        if (X<A || X>B)
        {
            if (X<A)
            {
                y = -XB / AB;
            }
            else
            {
                y = -(X-B) / AB;
            }
            
            if (y > -0.5f)
            {
                y *= 2;
            }
            else
            {
                y = -(1 + y)*2;
            }
        }
        else
        {
            y = (X-A)/(B-A);
 
            if (y < 0.5f)
            {
                y *= 2;
            }
            else
            {
                y = (1 - y)*2;
            }
        }
 
        Ogre::Vector2 East = mEastDirection;
 
        if (X > A && X < B)
        {
            if (X > (A + AB_/2))
            {
                East = -East;
            }
        }
        else
        {
            if (X<=A)
            {
                if (XB < (24-AB_)/2)
                {
                    East = -East;
                }
            }
            else
            {
                if ((X-B) < (24-AB_)/2)
                {
                    East = -East;
                }
            }
        }
 
        float ydeg = (Ogre::Math::PI/2)*y,
              sn = Ogre::Math::Sin(ydeg),
              cs = Ogre::Math::Cos(ydeg);
 
        mSunDirection = Ogre::Vector3(East.x*cs, sn, East.y*cs);
        mMoonDirection = -mSunDirection;
    }
}