tubegenerator.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 _graphicsproceduraltubegenerator_cpp
#define _graphicsproceduraltubegenerator_cpp

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

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            TubeGenerator::TubeGenerator(const Real InnerRadius, const Real OuterRadius, const Real Height, const Whole SegCircle, const Whole SegHeight) :
                TubeInnerRadius(InnerRadius),
                TubeOuterRadius(OuterRadius),
                TubeHeight(Height),
                NumSegCircle(SegCircle),
                NumSegHeight(SegHeight)
                {  }

            TubeGenerator::~TubeGenerator()
                {  }

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

            void TubeGenerator::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                Buffer.RebaseOffset();
                Buffer.EstimateVertexCount( ( this->NumSegHeight + 1 ) * ( this->NumSegCircle + 1 ) * 2 + ( this->NumSegCircle + 1 ) * 4 );
                Buffer.EstimateIndexCount( 6 * ( this->NumSegCircle + 1 ) * this->NumSegHeight * 2 + 6 * this->NumSegCircle * 2 );

                Real deltaAngle = ( MathTools::GetTwoPi() / this->NumSegCircle );
                Real deltaHeight = this->TubeHeight / (Real)this->NumSegHeight;
                int Offset = 0;

                for( Whole i = 0 ; i <= this->NumSegHeight ; ++i )
                {
                    for( Whole j = 0 ; j <= this->NumSegCircle ; ++j )
                    {
                        Real x0 = this->TubeOuterRadius * cosf( j * deltaAngle );
                        Real z0 = this->TubeOuterRadius * sinf( j * deltaAngle );
                        this->AddPoint(Buffer, Vector3( x0, i * deltaHeight, z0 ),
                                       Vector3( x0, 0, z0 ).GetNormal(),
                                       Vector2( j / (Real)this->NumSegCircle, i / (Real)this->NumSegHeight ) );

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

                for( Whole i = 0 ; i <= this->NumSegHeight ; ++i )
                {
                    for( Whole j = 0 ; j<= this->NumSegCircle ; ++j )
                    {
                        Real x0 = this->TubeInnerRadius * cosf( j * deltaAngle );
                        Real z0 = this->TubeInnerRadius * sinf( j * deltaAngle );
                        this->AddPoint(Buffer, Vector3( x0, i * deltaHeight, z0 ),
                                       -Vector3( x0, 0, z0 ).GetNormal(),
                                       Vector2( j / (Real)this->NumSegCircle, i / (Real)this->NumSegHeight ) );

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

                //low cap
                for( Whole j = 0 ; j <= this->NumSegCircle ; ++j )
                {
                    Real x0 = this->TubeInnerRadius * cosf( j * deltaAngle );
                    Real z0 = this->TubeInnerRadius * sinf( j * deltaAngle );

                    this->AddPoint(Buffer, Vector3( x0, 0.0f, z0 ),
                                   Vector3::Neg_Unit_Y(),
                                   Vector2( j / (Real)this->NumSegCircle, 1. ) );

                    x0 = this->TubeOuterRadius * cosf( j * deltaAngle );
                    z0 = this->TubeOuterRadius * sinf( j * deltaAngle );

                    this->AddPoint(Buffer, Vector3( x0, 0.0f, z0 ),
                                   Vector3::Neg_Unit_Y(),
                                   Vector2( j / (Real)this->NumSegCircle, 0. ) );

                    if( j != this->NumSegCircle ) {
                        Buffer.AddIndex( Offset );
                        Buffer.AddIndex( Offset + 1 );
                        Buffer.AddIndex( Offset + 3 );
                        Buffer.AddIndex( Offset + 2 );
                        Buffer.AddIndex( Offset );
                        Buffer.AddIndex( Offset + 3 );
                    }
                    Offset += 2;
                }


                //high cap
                for( Whole j = 0 ; j <= this->NumSegCircle ; ++j )
                {
                    Real x0 = this->TubeInnerRadius * cosf( j * deltaAngle );
                    Real z0 = this->TubeInnerRadius * sinf( j * deltaAngle );

                    this->AddPoint(Buffer, Vector3( x0, this->TubeHeight, z0 ),
                                   Vector3::Unit_Y(),
                                   Vector2( j / (Real)this->NumSegCircle, 0. ) );

                    x0 = this->TubeOuterRadius * cosf( j * deltaAngle );
                    z0 = this->TubeOuterRadius * sinf( j * deltaAngle );

                    this->AddPoint(Buffer, Vector3( x0, this->TubeHeight, z0 ),
                                   Vector3::Unit_Y(),
                                   Vector2( j / (Real)this->NumSegCircle, 1. ) );

                    if( j != this->NumSegCircle ) {
                        Buffer.AddIndex( Offset + 1 );
                        Buffer.AddIndex( Offset );
                        Buffer.AddIndex( Offset + 3 );
                        Buffer.AddIndex( Offset );
                        Buffer.AddIndex( Offset + 2 );
                        Buffer.AddIndex( Offset + 3 );
                    }
                    Offset += 2;
                }
            }

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

            TubeGenerator& TubeGenerator::SetInnerRadius(const Real InnerRadius)
            {
                if( InnerRadius <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Radius for a generated tube mesh must be greater than zero.");

                if( this->TubeOuterRadius < InnerRadius )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Outer radius must be larger than inner radius!");

                this->TubeInnerRadius = InnerRadius;
                return *this;
            }

            TubeGenerator& TubeGenerator::SetOuterRadius(const Real OuterRadius)
            {
                if( OuterRadius <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Radius for a generated tube mesh must be greater than zero.");

                if( OuterRadius < this->TubeInnerRadius )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Outer radius must be larger than inner radius!");

                this->TubeOuterRadius = OuterRadius;
                return *this;
            }

            TubeGenerator& TubeGenerator::SetHeight(const Real Height)
            {
                if( Height <= 0.0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Height for a generated cylinder mesh must be greater than zero.");

                this->TubeHeight = Height;
                return *this;
            }

            TubeGenerator& TubeGenerator::SetNumSegCircle(const Whole SegCircle)
            {
                if( SegCircle < 3 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for circular component of generated tube mesh must be greater than two.");

                this->NumSegCircle = SegCircle;
                return *this;
            }

            TubeGenerator& TubeGenerator::SetNumSegHeight(const Whole SegHeight)
            {
                if( SegHeight == 0 )
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"Number of segments for length component of generated tube mesh must be greater than zero.");

                this->NumSegHeight = SegHeight;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif