cylinderuvmodifier.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
 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:

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 all copies or substantial portions of the Software.

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 -----------------------------------------------------------------------------
 */
#ifndef _graphicsproceduralcylinderuvmodifier_cpp
#define _graphicsproceduralcylinderuvmodifier_cpp

#include "Graphics/Procedural/Mesh/cylinderuvmodifier.h"

#include "MathTools/mathtools.h"

#include "exception.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            CylinderUVModifier::CylinderUVModifier() :
                CylinderHeight(1.0),
                CylinderRadius(1.0)
                {  }

            CylinderUVModifier::~CylinderUVModifier()
                {  }

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

            void CylinderUVModifier::Modify(TriangleBuffer& Buffer)
            {
                if( this->CylinderHeight <= 0 )
                    MEZZ_EXCEPTION(ExceptionBase::INVALID_STATE_EXCEPTION,"Cylinder height must be positive.");
                if( this->CylinderRadius <= 0 )
                    MEZZ_EXCEPTION(ExceptionBase::INVALID_STATE_EXCEPTION,"Cylinder radius must be positive.");

                Real AngleThreshold = MathTools::ATan( this->CylinderHeight / this->CylinderRadius );
                for( VertexIterator VertIt = Buffer.GetVertices().begin() ; VertIt != Buffer.GetVertices().end() ; ++VertIt )
                {
                    Vector2 XZNorm( VertIt->Normal.X, VertIt->Normal.Z );
                    Real Alpha = ( MathTools::ATan( VertIt->Normal.Y / XZNorm.Length() ) + MathTools::GetHalfPi() );
                    if( MathTools::Abs(Alpha) > AngleThreshold ) {
                        Vector2 XZVec( VertIt->Position.X, VertIt->Position.Z );
                        VertIt->UV = XZVec / this->CylinderRadius;
                    }else{
                        Vector2 XZVec( VertIt->Position.X, VertIt->Position.Z );
                        VertIt->UV.X = Vector2::Unit_X().AngleTo(XZVec) / MathTools::GetTwoPi();
                        VertIt->UV.Y = VertIt->Position.Y / this->CylinderHeight - 0.5;
                    }
                }
            }

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

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

            CylinderUVModifier& CylinderUVModifier::SetHeight(const Real Height)
            {
                this->CylinderHeight = Height;
                return *this;
            }

            CylinderUVModifier& CylinderUVModifier::SetRadius(const Real Radius)
            {
                this->CylinderRadius = Radius;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif