conegenerator.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
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 */
#ifndef _graphicsproceduralconegenerator_cpp
#define _graphicsproceduralconegenerator_cpp

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

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

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            ConeGenerator::ConeGenerator(const Real Radius, const Real Height, const Whole SegCircle, const Whole SegHeight) :
                ConeRadius(Radius),
                ConeHeight(Height),
                NumSegCircle(SegCircle),
                NumSegHeight(SegHeight)
                {  }

            ConeGenerator::~ConeGenerator()
                {  }

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

            void ConeGenerator::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                Buffer.RebaseOffset();
                Buffer.EstimateVertexCount( ( this->NumSegHeight + 1 ) * ( this->NumSegCircle + 1 ) + this->NumSegCircle + 2 );
                Buffer.EstimateIndexCount( this->NumSegHeight * this->NumSegCircle * 6 + 3 * this->NumSegCircle );

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

                Vector3 refNormal = Vector3( this->ConeRadius, this->ConeHeight, 0.f ).GetNormal();
                Quaternion q;

                for( Whole i = 0 ; i <= this->NumSegHeight ; i++ )
                {
                    Real r0 = this->ConeRadius * ( 1 - i / (Real)this->NumSegHeight );
                    for( Whole j = 0; j <= this->NumSegCircle ; j++ )
                    {
                        Real x0 = r0 * cosf( j * deltaAngle );
                        Real z0 = r0 * sinf( j * deltaAngle );

                        q.SetFromAxisAngle( -deltaAngle * j, Vector3::Unit_Y() );

                        this->AddPoint(Buffer, Vector3( x0, i * deltaHeight, z0 ),
                                       q * refNormal,
                                       Vector2( j / (Real)this->NumSegCircle, i / (Real)this->NumSegHeight ) );

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

                        Offset++;
                    }
                }

                //low cap
                Integer CenterIndex = Offset;
                this->AddPoint(Buffer, Vector3(0.0,0.0,0.0),
                               Vector3::Neg_Unit_Y(),
                               Vector2(0.0,1.0) );
                Offset++;
                for( Whole j = 0 ; j <= this->NumSegCircle ; j++ )
                {
                    Real x0 = this->ConeRadius * cosf( j * deltaAngle );
                    Real z0 = this->ConeRadius * sinf( j * deltaAngle );

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

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

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

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

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

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

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

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

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

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

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

#endif