ColorGradient.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 "ColorGradient.h"
 
namespace SkyX
{
    ColorGradient::ColorGradient()
        : mMalFormed(true)
    {
    }
 
    ColorGradient::~ColorGradient()
    {
    }
 
    const Ogre::Vector3 ColorGradient::getColor(const Ogre::Real& p) const
    {
        if (mMalFormed)
        {
            SkyXLOG("Mal-formed ColorGradient");
            return Ogre::Vector3(0,0,0);
        }
 
        if (CFrameVector.size() == 0)
        {
            return Ogre::Vector3(0,0,0);
        }
        else if (CFrameVector.size() == 1)
        {
            return CFrameVector.at(0).first;
        }
 
        std::pair<int, Ogre::Real> minBound, maxBound;
 
        // Min value
        minBound.first = 0;
        minBound.second = -1;
        for (unsigned int k = 0; k < CFrameVector.size(); k++)
        {
            if (CFrameVector.at(k).second < p && CFrameVector.at(k).second > minBound.second)
            {
                minBound.first = k;
                minBound.second = CFrameVector.at(k).second;
            }
        }
 
        // Max value
        maxBound.first = 0;
        maxBound.second = 2;
        for (unsigned int k = 0; k < CFrameVector.size(); k++)
        {
            if (CFrameVector.at(k).second > p && CFrameVector.at(k).second < maxBound.second)
            {
                maxBound.first = k;
                maxBound.second = CFrameVector.at(k).second;
            }
        }
 
        float range = maxBound.second - minBound.second,
              rangepoint = (p - minBound.second) / range;
 
        return CFrameVector.at(minBound.first).first*(1-rangepoint) + CFrameVector.at(maxBound.first).first*rangepoint;
    }
 
    const bool ColorGradient::_checkBounds() const
    {
        std::pair<bool, bool> existbounds;
        existbounds.first = false; existbounds.second = false;
 
        for (unsigned int k = 0; k < CFrameVector.size(); k++)
        {
            if (CFrameVector.at(k).second == 0)
            {
                // More than one min bound
                if (existbounds.first)
                {
                    return false;
                }
 
                existbounds.first = true;
            }
 
            if (CFrameVector.at(k).second < 0 || CFrameVector.at(k).second > 1)
            {
                return false;
            }
        }
 
        for (unsigned int k = 0; k < CFrameVector.size(); k++)
        {
            if (CFrameVector.at(k).second == 1)
            {
                // More than one min bound
                if (existbounds.second)
                {
                    return false;
                }
 
                existbounds.second = true;
            }
        }
 
        if (!existbounds.first || !existbounds.second)
        {
            return false;
        }
 
        return true;
    }
}