torusknotgenerator.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

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/*
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 This source file is part of ogre-procedural

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

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 */
#ifndef _graphicsproceduraltorusknotgenerator_cpp
#define _graphicsproceduraltorusknotgenerator_cpp

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

#include "MathTools/mathtools.h"
#include "exception.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            TorusKnotGenerator::TorusKnotGenerator(const Real PoloidalRadius, const Real ToroidalRadius, const Integer PParam, const Integer QParam, const Whole PoloidalSeg, const Whole ToroidalSeg) :
                TorusPoloidalRadius(PoloidalRadius),
                TorusToroidalRadius(ToroidalRadius),
                PParameter(PParam),
                QParameter(QParam),
                NumPoloidalSeg(PoloidalSeg),
                NumToroidalSeg(ToroidalSeg)
                {  }

            TorusKnotGenerator::~TorusKnotGenerator()
                {  }

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

            void TorusKnotGenerator::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                Buffer.RebaseOffset();
                Buffer.EstimateVertexCount( ( this->NumPoloidalSeg * this->PParameter + 1 ) * ( this->NumToroidalSeg + 1 ) );
                Buffer.EstimateIndexCount( ( this->NumPoloidalSeg * this->PParameter ) * ( this->NumToroidalSeg + 1 ) * 6 );

                int Offset = 0;

                for( Whole i = 0 ; i <= this->NumPoloidalSeg * this->PParameter ; i++ )
                {
                    Real phi = MathTools::GetTwoPi() * i / (Real)this->NumPoloidalSeg;
                    Real x0 = this->TorusPoloidalRadius * ( 2 + cos( this->QParameter * phi / (Real)this->PParameter ) ) * cos( phi ) / 3.f;
                    Real y0 = this->TorusPoloidalRadius * sin( this->QParameter * phi / (Real)this->PParameter ) / 3.f;
                    Real z0 = this->TorusPoloidalRadius * ( 2 + cos( this->QParameter * phi / (Real)this->PParameter ) ) * sin(phi) / 3.f;

                    Real phi1 = MathTools::GetTwoPi() * ( i + 1 ) / (Real)this->NumPoloidalSeg;
                    Real x1 = this->TorusPoloidalRadius * ( 2 + cos( this->QParameter * phi1 / (Real)this->PParameter ) ) * cos( phi1) / 3.f;
                    Real y1 = this->TorusPoloidalRadius * sin( this->QParameter * phi1 / this->PParameter ) / 3.f;
                    Real z1 = this->TorusPoloidalRadius * ( 2 + cos( this->QParameter * phi1 / (Real)this->PParameter ) ) * sin( phi1 ) / 3.f;

                    Vector3 v0( x0, y0, z0 );
                    Vector3 v1( x1, y1, z1 );
                    Vector3 direction( ( v1 - v0 ).GetNormal() );

                    Quaternion KnotRot( direction,Vector3::Unit_Y() );

                    for( Whole j =0 ; j <= this->NumToroidalSeg ; j++ )
                    {
                        Real alpha = MathTools::GetTwoPi() * j / this->NumToroidalSeg;
                        Vector3 vp = ( KnotRot * Vector3( cos(alpha), sin(alpha), 0 ) ) * this->TorusToroidalRadius;

                        this->AddPoint( Buffer, v0 + vp,
                                        vp.GetNormal(),
                                        Vector2( i / (Real)this->NumPoloidalSeg, j / (Real)this->NumToroidalSeg ) );

                        if( i != this->NumPoloidalSeg * this->PParameter ) {
                            Buffer.AddIndex( Offset + this->NumToroidalSeg + 1 );
                            Buffer.AddIndex( Offset + this->NumToroidalSeg );
                            Buffer.AddIndex( Offset );
                            Buffer.AddIndex( Offset + this->NumToroidalSeg + 1 );
                            Buffer.AddIndex( Offset );
                            Buffer.AddIndex( Offset + 1 );
                        }
                        Offset++;
                    }
                }
            }

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

            TorusKnotGenerator& TorusKnotGenerator::SetPoloidalRadius(const Real PoloidalRadius)
            {
                if( PoloidalRadius <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Radius for Poloidal ring of a generated torus mesh must be greater than zero.");

                this->TorusPoloidalRadius = PoloidalRadius;
                return *this;
            }

            TorusKnotGenerator& TorusKnotGenerator::SetToroidalRadius(const Real ToroidalRadius)
            {
                if( ToroidalRadius <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Radius for Toroidal ring of a generated torus mesh must be greater than zero.");

                this->TorusToroidalRadius = ToroidalRadius;
                return *this;
            }

            TorusKnotGenerator& TorusKnotGenerator::SetPParameter(const Integer PParam)
            {
                if( PParam <= 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"The P Parameter of a generated torus knot mesh must be greater than zero.");

                this->PParameter = PParam;
                return *this;
            }

            TorusKnotGenerator& TorusKnotGenerator::SetQParameter(const Integer QParam)
            {
                if( QParam <= 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"The Q Parameter of a generated torus knot mesh must be greater than zero.");

                this->QParameter = QParam;
                return *this;
            }

            TorusKnotGenerator& TorusKnotGenerator::SetNumPoloidalSeg(const Whole PoloidalSeg)
            {
                if( PoloidalSeg < 3 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for Poloidal ring of generated torus mesh must be greater than two.");

                this->NumPoloidalSeg = PoloidalSeg;
                return *this;
            }

            TorusKnotGenerator& TorusKnotGenerator::SetNumToroidalSeg(const Whole ToroidalSeg)
            {
                if( ToroidalSeg < 3 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for Toroidal ring of generated torus mesh must be greater than two.");

                this->NumToroidalSeg = ToroidalSeg;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif