lathe.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
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 */
#ifndef _graphicsprocedurallathe_cpp
#define _graphicsprocedurallathe_cpp

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

//#include "Graphics/Procedural/proceduraldatatypes.h"
#include "Graphics/Procedural/shape.h"
#include "Graphics/Procedural/multishape.h"
#include "Graphics/Procedural/triangulator.h"

#include "MathTools/constants.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            Lathe::Lathe() :
                ShapeToLathe(NULL),
                MultiShapeToLathe(NULL),
                NumSegments(16),
                AngleBegin(0),
                AngleEnd(MathTools::GetTwoPi()),
                Closed(true),
                Capped(true)
                {  }

            Lathe::Lathe(Shape* ToLathe, const Whole Segments) :
                ShapeToLathe(ToLathe),
                MultiShapeToLathe(NULL),
                NumSegments(Segments > 2 ? Segments : 3),
                AngleBegin(0),
                AngleEnd(MathTools::GetTwoPi()),
                Closed(true),
                Capped(true)
                {  }

            Lathe::Lathe(MultiShape* ToLathe, const Whole Segments) :
                ShapeToLathe(NULL),
                MultiShapeToLathe(ToLathe),
                NumSegments(Segments > 2 ? Segments : 3),
                AngleBegin(0),
                AngleEnd(MathTools::GetTwoPi()),
                Closed(true),
                Capped(true)
                {  }

            Lathe::~Lathe()
                {  }

            void Lathe::GenerateCaps(TriangleBuffer& Buffer) const
            {
                IndexContainer Indexes;
                Point2DContainer Points;

                Buffer.RebaseOffset();

                Triangulator Tri;
                Shape ShapeCopy;
                MultiShape MultishapeCopy;

                if( this->ShapeToLathe ) {
                    ShapeCopy = *this->ShapeToLathe;
                    ShapeCopy.Close();
                    Tri.SetShapeToTriangulate(&ShapeCopy);
                }else{
                    MultishapeCopy = *this->MultiShapeToLathe;
                    MultishapeCopy.Close();
                    Tri.SetMultiShapeToTriangulate(this->MultiShapeToLathe);
                }
                Tri.Triangulate(Indexes,Points);
                Buffer.EstimateIndexCount(2*Indexes.size());
                Buffer.EstimateVertexCount(2*Points.size());

                // begin cap
                Buffer.RebaseOffset();
                Quaternion Quat;
                Quat.SetFromAxisAngle(this->AngleBegin,Vector3::Unit_Y());
                for( Whole CurrPoint = 0 ; CurrPoint < Points.size() ; ++CurrPoint )
                {
                    Vector2 Point2D = Points[CurrPoint];
                    Vector3 Point3D(Point2D.X,Point2D.Y,0);
                    Vector3 Normal = Vector3::Unit_Z();

                    this->AddPoint(Buffer, Quat * Point3D, Quat * Normal, Point2D);
                }

                for( Whole CurrIndex = 0 ; CurrIndex < Indexes.size() / 3 ; ++CurrIndex )
                {
                    Buffer.AddIndex( Indexes[CurrIndex*3] );
                    Buffer.AddIndex( Indexes[CurrIndex*3+1] );
                    Buffer.AddIndex( Indexes[CurrIndex*3+2] );
                }
                // end cap
                Buffer.RebaseOffset();
                Quat.SetFromAxisAngle(this->AngleEnd,Vector3::Unit_Y());
                for( Whole CurrPoint = 0 ; CurrPoint < Points.size() ; ++CurrPoint )
                {
                    Vector2 Point2D = Points[CurrPoint];
                    Vector3 Point3D(Point2D.X,Point2D.Y,0);
                    Vector3 Normal = Vector3::Neg_Unit_Z();

                    this->AddPoint(Buffer, Quat * Point3D, Quat * Normal, Point2D);
                }

                for( Whole CurrIndex = 0 ; CurrIndex < Indexes.size() / 3 ; ++CurrIndex )
                {
                    Buffer.AddIndex( Indexes[CurrIndex*3] );
                    Buffer.AddIndex( Indexes[CurrIndex*3+2] );
                    Buffer.AddIndex( Indexes[CurrIndex*3+1] );
                }
            }

            void Lathe::GenerateBody(TriangleBuffer& Buffer, const Shape* ToLathe) const
            {
                if( ToLathe == NULL ) {
                    MEZZ_EXCEPTION(ExceptionBase::INVALID_STATE_EXCEPTION,"Invalid shape detected when performing a Lathe.");
                }
                Integer NumShapeSegments = ToLathe->GetSegCount();
                if( this->NumSegments < 3 ) {
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"The number of segments when Lathe'ing a shape cannot be less than 3.");
                }
                Integer Offset = 0;

                //Integer NumLatheSegments = this->Closed ? this->NumSegments + 1 : this->NumSegments;
                Integer NumLatheSegments = this->NumSegments + 1;
                Buffer.RebaseOffset();
                Buffer.EstimateIndexCount( NumLatheSegments * NumShapeSegments * 6 );
                Buffer.EstimateVertexCount( ( NumShapeSegments + 1 ) * ( NumLatheSegments + 1 ) );

                Real TempEnd = this->AngleEnd;
                if( this->AngleBegin > this->AngleEnd ) {
                    TempEnd += MathTools::GetTwoPi();
                }

                for( Integer LatheSegIndex = 0 ; LatheSegIndex < NumLatheSegments ; ++LatheSegIndex )
                {
                    Real Angle = 0;
                    if( this->Closed ) {
                        Angle = LatheSegIndex / static_cast<Real>( this->NumSegments ) * MathTools::GetTwoPi();
                    }else{
                        Angle = this->AngleBegin + LatheSegIndex / static_cast<Real>( this->NumSegments ) * ( TempEnd - this->AngleBegin );
                    }
                    Quaternion Quat;
                    Quat.SetFromAxisAngle(Angle,Vector3::Unit_Y());

                    for( Integer ShapeSegIndex = 0 ; ShapeSegIndex <= NumShapeSegments ; ++ShapeSegIndex )
                    {
                        const Vector2& SegStart = ToLathe->GetPoint(ShapeSegIndex);
                        const Vector2& SegDirection = ToLathe->GetAvgDirection(ShapeSegIndex);
                        Vector2 SegNormal = SegDirection.Perpendicular();
                        Vector3 VertPos(SegStart.X,SegStart.Y,0);
                        Vector3 Normal3D(SegNormal.X,SegNormal.Y,0);
                        Normal3D.Normalize();
                        if( ToLathe->GetOutSide() == Procedural::SS_Right ) {
                            Normal3D = -Normal3D;
                        }

                        this->AddPoint(Buffer, Quat * VertPos, Quat * Normal3D, Vector2( LatheSegIndex / static_cast<Real>( this->NumSegments ), ShapeSegIndex / static_cast<Real>( NumShapeSegments ) ) );

                        if( ShapeSegIndex < NumShapeSegments && LatheSegIndex < NumLatheSegments - 1 ) {
                            if( ToLathe->GetOutSide() == Procedural::SS_Right ) {
                                Buffer.AddTriangle(Offset + NumShapeSegments + 2, Offset, Offset + NumShapeSegments + 1);
                                Buffer.AddTriangle(Offset + NumShapeSegments + 2, Offset + 1, Offset);
                            }else{
                                Buffer.AddTriangle(Offset + NumShapeSegments + 2, Offset + NumShapeSegments + 1, Offset);
                                Buffer.AddTriangle(Offset + NumShapeSegments + 2, Offset, Offset + 1);
                            }
                        }
                        Offset++;
                    }
                }
            }

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

            void Lathe::AddToTriangleBuffer(TriangleBuffer& Buffer) const
            {
                if( this->ShapeToLathe == NULL && this->MultiShapeToLathe == NULL ) {
                    MEZZ_EXCEPTION(ExceptionBase::INVALID_STATE_EXCEPTION,"A shape or multishape must be defined in order to perform a lathe.");
                }

                // Triangulate the begin and end caps
                if( !this->Closed && this->Capped ) {
                    this->GenerateCaps(Buffer);
                }

                // Extrudes the body
                if( this->ShapeToLathe ) {
                    this->GenerateBody(Buffer,this->ShapeToLathe);
                }else{
                    for( Whole Index = 0 ; Index < this->MultiShapeToLathe->GetNumShapes() ; ++Index )
                    {
                        this->GenerateBody(Buffer,&this->MultiShapeToLathe->GetShape(Index));
                    }
                }
            }

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

            Lathe& Lathe::SetShapeToLathe(Shape* ToLathe)
            {
                this->ShapeToLathe = ToLathe;
                this->MultiShapeToLathe = NULL;
                return *this;
            }

            Lathe& Lathe::SetMultiShapeToLathe(MultiShape* ToLathe)
            {
                this->ShapeToLathe = NULL;
                this->MultiShapeToLathe = ToLathe;
                return *this;
            }

            Lathe& Lathe::SetNumSegments(const Whole Segments)
            {
                if( Segments < 3 ) {
                    MEZZ_EXCEPTION(ExceptionBase::PARAMETERS_EXCEPTION,"The number of segments when Lathe'ing a shape cannot be less than 3.");
                }
                this->NumSegments = Segments;
                return *this;
            }

            Lathe& Lathe::SetAngleBegin(const Real Begin)
            {
                this->AngleBegin = Begin;
                this->Closed = false;
                return *this;
            }

            Lathe& Lathe::SetAngleEnd(const Real End)
            {
                this->AngleEnd = End;
                this->Closed = false;
                return *this;
            }

            Lathe& Lathe::SetClosed(const Boole ShapeClosed)
            {
                this->Closed = ShapeClosed;
                return *this;
            }

            Lathe& Lathe::SetCapped(const Boole ShapeCapped)
            {
                this->Capped = ShapeCapped;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif