cylindergenerator.cpp

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

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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
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 */
#ifndef _graphicsproceduralcylindergenerator_cpp
#define _graphicsproceduralcylindergenerator_cpp

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

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            CylinderGenerator::CylinderGenerator(const Real Radius, const Real Height, const Whole SegCircle, const Whole SegHeight, const Boole Capped) :
                CylinderRadius(Radius),
                CylinderHeight(Height),
                NumSegCircle(SegCircle),
                NumSegHeight(SegHeight),
                CapEnds(Capped)
                {  }

            CylinderGenerator::~CylinderGenerator()
                {  }

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

            void CylinderGenerator::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                const Vector2 ZeroVec2(0,0);
                const Vector3 ZeroVec3(0,0,0);
                Buffer.RebaseOffset();
                if( this->CapEnds ) {
                    Buffer.EstimateVertexCount( ( this->NumSegHeight + 1 ) * ( this->NumSegCircle + 1 ) + 2 * ( this->NumSegCircle + 1 ) + 2 );
                    Buffer.EstimateIndexCount( this->NumSegHeight * ( this->NumSegCircle + 1 ) * 6 + 6 * this->NumSegCircle );
                }else{
                    Buffer.EstimateVertexCount( ( this->NumSegHeight + 1 ) * ( this->NumSegCircle + 1 ) );
                    Buffer.EstimateIndexCount( this->NumSegHeight * ( this->NumSegCircle + 1 ) * 6 );
                }


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

                for( Whole i = 0 ; i <= this->NumSegHeight ; i++ )
                {
                    for( Whole j = 0 ; j<= this->NumSegCircle ; j++ )
                    {
                        Real x0 = this->CylinderRadius * cosf( j * deltaAngle );
                        Real z0 = this->CylinderRadius * 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++;
                    }
                }

                if( this->CapEnds ) {
                    //low cap
                    Integer CenterIndex = Offset;
                    this->AddPoint(Buffer, ZeroVec3,
                                   Vector3::Neg_Unit_Y(),
                                   ZeroVec2);
                    Offset++;
                    for( Whole j = 0 ; j <= this->NumSegCircle ; j++ )
                    {
                        Real x0 = cosf( j * deltaAngle );
                        Real z0 = sinf( j * deltaAngle );

                        this->AddPoint(Buffer, Vector3(this->CylinderRadius * x0, 0.0f, this->CylinderRadius * z0),
                                       Vector3::Neg_Unit_Y(),
                                       Vector2(x0, z0));
                        if( j != this->NumSegCircle ) {
                            Buffer.AddIndex(CenterIndex);
                            Buffer.AddIndex(Offset);
                            Buffer.AddIndex(Offset + 1);
                        }
                        Offset++;
                    }
                    // high cap
                    CenterIndex = Offset;
                    this->AddPoint(Buffer, Vector3(0,this->CylinderHeight,0),
                                   Vector3::Unit_Y(),
                                   ZeroVec2);
                    Offset++;
                    for( Whole j = 0 ; j <= this->NumSegCircle ; j++ )
                    {
                        Real x0 = cosf( j * deltaAngle );
                        Real z0 = sinf( j * deltaAngle );

                        this->AddPoint(Buffer, Vector3(x0 * this->CylinderRadius, this->CylinderHeight, this->CylinderRadius * z0),
                                       Vector3::Unit_Y(),
                                       Vector2(x0, z0));

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

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

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

                this->CylinderRadius = Radius;
                return *this;
            }

            CylinderGenerator& CylinderGenerator::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->CylinderHeight = Height;
                return *this;
            }

            CylinderGenerator& CylinderGenerator::SetCapped(const Boole Capped)
            {
                this->CapEnds = Capped;
                return *this;
            }

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

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

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

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

#endif