torusgenerator.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
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 */
#ifndef _graphicsproceduraltorusgenerator_cpp
#define _graphicsproceduraltorusgenerator_cpp

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

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            TorusGenerator::TorusGenerator(const Real PoloidalRadius, const Real ToroidalRadius, const Whole PoloidalSeg, const Whole ToroidalSeg) :
                TorusPoloidalRadius(PoloidalRadius),
                TorusToroidalRadius(ToroidalRadius),
                NumPoloidalSeg(PoloidalSeg),
                NumToroidalSeg(ToroidalSeg)
                {  }

            TorusGenerator::~TorusGenerator()
                {  }

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

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

                Real deltaSection = ( MathTools::GetTwoPi() / this->NumToroidalSeg );
                Real deltaCircle = ( MathTools::GetTwoPi() / this->NumPoloidalSeg );
                Integer Offset = 0;

                for( Whole i = 0 ; i <= this->NumPoloidalSeg ; i++ )
                {
                    for( Whole j = 0 ; j<= this->NumToroidalSeg ; j++ )
                    {
                        Vector3 c0( this->TorusPoloidalRadius, 0.0, 0.0 );
                        Vector3 v0( this->TorusPoloidalRadius + this->TorusToroidalRadius * cosf( j * deltaSection ), this->TorusToroidalRadius * sinf( j * deltaSection ), 0.0 );
                        Quaternion q( i * deltaCircle, Vector3::Unit_Y() );
                        Vector3 v = q * v0;
                        Vector3 c = q * c0;
                        this->AddPoint( Buffer, v,
                                        ( v - c ).GetNormal(),
                                        Vector2( i / (Real)this->NumPoloidalSeg, j / (Real)this->NumToroidalSeg ) );

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

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

            TorusGenerator& TorusGenerator::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;
            }

            TorusGenerator& TorusGenerator::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;
            }

            TorusGenerator& TorusGenerator::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;
            }

            TorusGenerator& TorusGenerator::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