TplInterpolators.h

/***********************************************************************
    filename:   CEGUITplInterpolators.h
    created:    23/11/2010
    author:     Martin Preisler

    purpose:    Provides templated finger saving interpolators
*************************************************************************/
/***************************************************************************
 *   Copyright (C) 2004 - 2010 Paul D Turner & The CEGUI Development Team
 *
 *   Permission is hereby granted, free of charge, to any person obtaining
 *   a copy of this software and associated documentation files (the
 *   "Software"), to deal in the Software without restriction, including
 *   without limitation the rights to use, copy, modify, merge, publish,
 *   distribute, sublicense, and/or sell copies of the Software, and to
 *   permit persons to whom the Software is furnished to do so, subject to
 *   the following conditions:
 *
 *   The above copyright notice and this permission notice shall be
 *   included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *   IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 *   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 *   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 ***************************************************************************/
#ifndef _CEGUITplInterpolators_h_
#define _CEGUITplInterpolators_h_

#include "CEGUI/Base.h"
#include "CEGUI/Interpolator.h"
#include "CEGUI/PropertyHelper.h"

// Start of CEGUI namespace section
namespace CEGUI
{

class CEGUIEXPORT TplInterpolatorBase : public Interpolator
{
public:
    TplInterpolatorBase(const String& type):
        d_type(type)
    {}
    
    virtual ~TplInterpolatorBase() {}
    
    virtual const String& getType() const
    {
        return d_type;
    }
    
private:
    const String d_type;
};

template<typename T>
class TplLinearInterpolator : public TplInterpolatorBase
{
public:
    typedef PropertyHelper<T> Helper;
    
    TplLinearInterpolator(const String& type):
        TplInterpolatorBase(type)
    {}
    
    virtual ~TplLinearInterpolator() {}
    
    virtual String interpolateAbsolute(const String& value1,
                                       const String& value2,
                                       float position)
    {
        typename Helper::return_type val1 = Helper::fromString(value1);
        typename Helper::return_type val2 = Helper::fromString(value2);

        const T result = static_cast<const T>(val1 * (1.0f - position) + val2 * (position));

        return Helper::toString(result);
    }
    
    virtual String interpolateRelative(const String& base,
                                       const String& value1,
                                       const String& value2,
                                       float position)
    {
        typename Helper::return_type bas = Helper::fromString(base);
        typename Helper::return_type val1 = Helper::fromString(value1);
        typename Helper::return_type val2 = Helper::fromString(value2);

        const T result = static_cast<const T>(bas + (val1 * (1.0f - position) + val2 * (position)));

        return Helper::toString(result);
    }
    
    virtual String interpolateRelativeMultiply(const String& base,
                                               const String& value1,
                                               const String& value2,
                                               float position)
    {
        typename Helper::return_type bas = Helper::fromString(base);
        typename PropertyHelper<float>::return_type val1 = PropertyHelper<float>::fromString(value1);
        typename PropertyHelper<float>::return_type val2 = PropertyHelper<float>::fromString(value2);

        const float mul = val1 * (1.0f - position) + val2 * (position);

        const T result = static_cast<const T>(bas * mul);

        return Helper::toString(result);
    }
};

template<typename T>
class TplDiscreteInterpolator : public TplInterpolatorBase
{
public:
    typedef PropertyHelper<T> Helper;
    
    TplDiscreteInterpolator(const String& type):
        TplInterpolatorBase(type)
    {}
    
    virtual ~TplDiscreteInterpolator() {}
    
    virtual String interpolateAbsolute(const String& value1,
                                       const String& value2,
                                       float position)
    {
        typename Helper::return_type val1 = Helper::fromString(value1);
        typename Helper::return_type val2 = Helper::fromString(value2);

        typename Helper::return_type result = position < 0.5 ? val1 : val2;;

        return Helper::toString(result);
    }
    
    virtual String interpolateRelative(const String& /*base*/,
                                       const String& value1,
                                       const String& value2,
                                       float position)
    {
        //typename Helper::return_type bas = Helper::fromString(base);
        typename Helper::return_type val1 = Helper::fromString(value1);
        typename Helper::return_type val2 = Helper::fromString(value2);
        
        typename Helper::return_type result = position < 0.5 ? val1 : val2;
        
        return Helper::toString(result);
    }
    
    virtual String interpolateRelativeMultiply(const String& base,
                                               const String& /*value1*/,
                                               const String& /*value2*/,
                                               float /*position*/)
    {
        typename Helper::return_type bas = Helper::fromString(base);
        /*const float val1 = PropertyHelper<float>::fromString(value1);
        const float val2 = PropertyHelper<float>::fromString(value2);

        const float mul = val1 * (1.0f - position) + val2 * (position);*/

        // there is nothing we can do, we have no idea what operators T has overloaded
        return Helper::toString(bas);
    }
};

template<typename T>
class TplDiscreteRelativeInterpolator : public TplDiscreteInterpolator<T>
{
public:
    typedef PropertyHelper<T> Helper;
    
    TplDiscreteRelativeInterpolator(const String& type):
        TplDiscreteInterpolator<T>(type)
    {}
    
    virtual ~TplDiscreteRelativeInterpolator() {}
    
    virtual String interpolateRelative(const String& base,
                                       const String& value1,
                                       const String& value2,
                                       float position)
    {
        typename Helper::return_type bas = Helper::fromString(base);
        typename Helper::return_type val1 = Helper::fromString(value1);
        typename Helper::return_type val2 = Helper::fromString(value2);
        
        typename Helper::return_type result = bas + (position < 0.5 ? val1 : val2);
        
        return Helper::toString(result);
    }
};

} // End of  CEGUI namespace section

#endif  // end of guard _CEGUITplInterpolators_h_