rotationzoommodifier.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
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/*
 -----------------------------------------------------------------------------
 This source file is part of ogre-procedural

 For the latest info, see http://code.google.com/p/ogre-procedural/

 Copyright (c) 2010-2013 Michael Broutin

 Permission is hereby granted, free of charge, to any person obtaining a copy
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 */
#ifndef _graphicsproceduralrotationzoommodifier_cpp
#define _graphicsproceduralrotationzoommodifier_cpp

#include "Graphics/Procedural/Texture/rotationzoommodifier.h"

#include "MathTools/mathtools.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            RotationZoomModifier::RotationZoomModifier() :
                RotationCenter(0.5,0.5),
                ZoomFactor(1.0,1.0),
                Rotation(0.0)
                {  }

            RotationZoomModifier::~RotationZoomModifier()
                {  }

            ///////////////////////////////////////////////////////////////////////////////
            // Utility

            void RotationZoomModifier::Modify(TextureBuffer& Buffer)
            {
                Whole Width = Buffer.GetWidth();
                Whole Height = Buffer.GetHeight();
                TextureBuffer TempBuffer( Buffer );

                Real fZoomX = MathTools::Pow( 0.5, this->ZoomFactor.X - 1 );
                Real fZoomY = MathTools::Pow( 0.5, this->ZoomFactor.Y - 1 );
                Real RotSin = MathTools::Sin( this->Rotation );
                Real RotCos = MathTools::Cos( this->Rotation );
                Real HalfWidth = static_cast<Real>(Width) * 0.5;
                Real HalfHeight = static_cast<Real>(Height) * 0.5;
                Real XSin = RotSin * -HalfWidth;
                Real XCos = RotCos * -HalfWidth;
                Real YSin = RotSin * -HalfHeight;
                Real YCos = RotCos * -HalfHeight;

                for( Whole Y = 0 ; Y < Buffer.GetHeight() ; ++Y )
                {
                    Real TexU = ( ( XCos - YSin ) * fZoomX ) + ( this->RotationCenter.X * static_cast<Real>(Width) );
                    Real TexV = ( ( XSin + YCos ) * fZoomY ) + ( this->RotationCenter.Y * static_cast<Real>(Height) );
                    for( Whole X = 0 ; X < Buffer.GetWidth() ; ++X )
                    {
                        Real uf = (TexU >= 0) ? (TexU - (Integer)TexU) : 1 + (TexU - (Integer)TexU);
                        Real vf = (TexV >= 0) ? (TexV - (Integer)TexV) : 1 + (TexV - (Integer)TexV);
                        Whole ut = (TexU >= 0) ? (Whole)TexU : (Whole)TexU - 1;
                        Whole vt = (TexV >= 0) ? (Whole)TexV : (Whole)TexV - 1;

                        ColourValue Texel = Buffer.GetPixel( vt % Height, ut % Width ) * ( 1.0 - uf ) * ( 1.0 - vf );
                        Texel += Buffer.GetPixel( vt % Height, ( ut + 1 ) % Width ) * uf * ( 1.0 - vf );
                        Texel += Buffer.GetPixel( ( vt + 1 ) % Height, ut % Width ) * ( 1.0 - uf ) * vf;
                        Texel += Buffer.GetPixel( ( vt + 1 ) % Height, ( ut + 1 ) % Width ) * uf * vf;

                        Texel.RedChannel = std::min(Real(1.0),Texel.RedChannel);
                        Texel.GreenChannel = std::min(Real(1.0),Texel.GreenChannel);
                        Texel.BlueChannel = std::min(Real(1.0),Texel.BlueChannel);
                        Texel.AlphaChannel = std::min(Real(1.0),Texel.AlphaChannel);
                        TempBuffer.SetPixel(X,Y,Texel);

                        TexU += RotCos * fZoomX;
                        TexV += RotSin * fZoomY;
                    }
                    YSin += RotSin;
                    YCos += RotCos;
                }

                Buffer.SetData(TempBuffer);
            }

            String RotationZoomModifier::GetName() const
                { return "RotationZoomModifier"; }

            ///////////////////////////////////////////////////////////////////////////////
            // Configuration

            RotationZoomModifier& RotationZoomModifier::SetRotationCenter(const Vector2& Center)
                { this->RotationCenter = Center;  return *this; }

            RotationZoomModifier& RotationZoomModifier::SetRotationCenterX(const Real X)
                { this->RotationCenter.X = X;  return *this; }

            RotationZoomModifier& RotationZoomModifier::SetRotationCenterY(const Real Y)
                { this->RotationCenter.Y = Y;  return *this; }

            RotationZoomModifier& RotationZoomModifier::SetZoomFactor(const Vector2& Zoom)
                { this->ZoomFactor = Zoom;  return *this; }

            RotationZoomModifier& RotationZoomModifier::SetZoomFactorX(const Real X)
                { this->ZoomFactor.X = X;  return *this; }

            RotationZoomModifier& RotationZoomModifier::SetZoomFactorY(const Real Y)
                { this->ZoomFactor.Y = Y;  return *this; }

            RotationZoomModifier& RotationZoomModifier::SetRotation(const Real Rot)
                { this->Rotation = Rot;  return *this; }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif