glc_cylinder.cpp

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 Version 2.0.0 Beta 1, packaged on April 2010.

 http://glc-lib.sourceforge.net

 GLC-lib is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 GLC-lib is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

*****************************************************************************/


#include "glc_cylinder.h"
#include "../glc_openglexception.h"
#include "../shading/glc_selectionmaterial.h"
#include "../glc_state.h"

#include <QVector>

// Class chunk id
quint32 GLC_Cylinder::m_ChunkId= 0xA705;

// Constructor destructor

GLC_Cylinder::GLC_Cylinder(double dRadius, double dLength)
:GLC_Mesh()
, m_Radius(dRadius)
, m_Length(dLength)
, m_Discret(glc::GLC_POLYDISCRET)       // Default discretion
, m_EndedIsCaped(true)                  // Cylinder ended are closed
{
        Q_ASSERT((m_Radius > 0.0) && (m_Length > 0.0));
}

GLC_Cylinder::GLC_Cylinder(const GLC_Cylinder& sourceCylinder)
:GLC_Mesh(sourceCylinder)
, m_Radius(sourceCylinder.m_Radius)
, m_Length(sourceCylinder.m_Length)
, m_Discret(sourceCylinder.m_Discret)
, m_EndedIsCaped(sourceCylinder.m_EndedIsCaped)
{
        Q_ASSERT((m_Radius > 0.0) && (m_Length > 0.0) && (m_Discret > 0));

}
GLC_Cylinder::~GLC_Cylinder()
{

}

// Get Functions
// Return the class Chunk ID
quint32 GLC_Cylinder::chunckID()
{
        return m_ChunkId;
}

// Return a copy of the current geometry
GLC_Geometry* GLC_Cylinder::clone() const
{
        return new GLC_Cylinder(*this);
}

// return the cylinder bounding box
const GLC_BoundingBox& GLC_Cylinder::boundingBox()
{
        if (GLC_Mesh::isEmpty())
        {
                createMeshAndWire();
        }
        return GLC_Mesh::boundingBox();
}

// Set Functions
// Set Cylinder length
void GLC_Cylinder::setLength(double Length)
{
        Q_ASSERT(Length > 0.0);
        m_Length= Length;

        GLC_Mesh::clearMeshWireAndBoundingBox();
}

// Set Cylinder radius
void GLC_Cylinder::setRadius(double Radius)
{
        Q_ASSERT(Radius > 0.0);
        m_Radius= Radius;

        GLC_Mesh::clearMeshWireAndBoundingBox();
}

// Set Discretion
void GLC_Cylinder::setDiscretion(int TargetDiscret)
{
        Q_ASSERT(TargetDiscret > 0);
        if (TargetDiscret != m_Discret)
        {
                m_Discret= TargetDiscret;
                if (m_Discret < 6) m_Discret= 6;

                GLC_Mesh::clearMeshWireAndBoundingBox();
        }
}

// End Caps
void GLC_Cylinder::setEndedCaps(bool CapsEnded)
{
        if (m_EndedIsCaped != CapsEnded)
        {
                m_EndedIsCaped= CapsEnded;

                GLC_Mesh::clearMeshWireAndBoundingBox();
        }
}

// Private Opengl functions

// Dessin du GLC_Cylinder
void GLC_Cylinder::glDraw(const GLC_RenderProperties& renderProperties)
{

        if (GLC_Mesh::isEmpty())
        {
                createMeshAndWire();
        }

        GLC_Mesh::glDraw(renderProperties);
}

// Create the cylinder mesh
void GLC_Cylinder::createMeshAndWire()
{
        Q_ASSERT(GLC_Mesh::isEmpty());
        Q_ASSERT(m_WireData.isEmpty());

        // Create cosinus and sinus array according to the discretion and radius
        const int vertexNumber= m_Discret + 1;
        // Normals values
        QVector<float> cosNormalArray(vertexNumber);
        QVector<float> sinNormalArray(vertexNumber);

        QVector<float> cosArray(vertexNumber);
        QVector<float> sinArray(vertexNumber);

        const double angle= (2.0 * glc::PI) / static_cast<double>(m_Discret);

        for (int i= 0; i < vertexNumber; ++i)
        {
                const double cosValue= cos(static_cast<double>(i) * angle);
                const double sinValue= sin(static_cast<double>(i) * angle);

                cosNormalArray[i]= static_cast<GLfloat>(cosValue);
                sinNormalArray[i]= static_cast<GLfloat>(sinValue);

                cosArray[i]= static_cast<GLfloat>(m_Radius * cosValue);
                sinArray[i]= static_cast<GLfloat>(m_Radius * sinValue);
        }

        // Mesh Data
        GLfloatVector verticeVector;
        GLfloatVector normalsVector;
        GLfloatVector texelVector;

        // Wire Data
        GLfloatVector bottomWireData(vertexNumber * 3);
        GLfloatVector topWireData(vertexNumber * 3);

        if (m_EndedIsCaped)
        {
                const int size= vertexNumber * 4;
                verticeVector.resize(3 * size);
                normalsVector.resize(3 * size);
                texelVector.resize(2 * size);
        }
        else
        {
                const int size= vertexNumber * 2;
                verticeVector.resize(3 * size);
                normalsVector.resize(3 * size);
                texelVector.resize(2 * size);
        }
        for (int i= 0; i < vertexNumber; ++i)
        {
                // Bottom Mesh
                verticeVector[3 * i]= cosArray[i];
                verticeVector[3 * i + 1]= sinArray[i];
                verticeVector[3 * i + 2]= 0.0f;

                normalsVector[3 * i]= cosNormalArray[i];
                normalsVector[3 * i + 1]= sinNormalArray[i];
                normalsVector[3 * i + 2]= 0.0f;

                texelVector[2 * i]= static_cast<float>(i) / static_cast<float>(m_Discret);
                texelVector[2 * i + 1]= 0.0f;

                // Bottom Wire
                bottomWireData[3 * i]= cosArray[i];
                bottomWireData[3 * i + 1]= sinArray[i];
                bottomWireData[3 * i + 2]= 0.0f;

                // Top
                verticeVector[3 * i + 3 * vertexNumber]= cosArray[i];
                verticeVector[3 * i + 1 + 3 * vertexNumber]= sinArray[i];
                verticeVector[3 * i + 2 + 3 * vertexNumber]= static_cast<float>(m_Length);

                normalsVector[3 * i + 3 * vertexNumber]= cosNormalArray[i];
                normalsVector[3 * i + 1 + 3 * vertexNumber]= sinNormalArray[i];
                normalsVector[3 * i + 2 + 3 * vertexNumber]= 0.0f;

                texelVector[2 * i + 2 * vertexNumber]= texelVector[i];
                texelVector[2 * i + 1 + 2 * vertexNumber]= 1.0f;

                // Top Wire
                topWireData[3 * i]= cosArray[i];
                topWireData[3 * i + 1]= sinArray[i];
                topWireData[3 * i + 2]= static_cast<float>(m_Length);

                if (m_EndedIsCaped)
                {
                        // Bottom Cap ends
                        verticeVector[3 * i + 2 * 3 * vertexNumber]= cosArray[i];
                        verticeVector[3 * i + 1 + 2 * 3 * vertexNumber]= sinArray[i];
                        verticeVector[3 * i + 2 + 2 * 3 * vertexNumber]= 0.0f;

                        normalsVector[3 * i + 2 * 3 * vertexNumber]= 0.0f;
                        normalsVector[3 * i + 1 + 2 * 3 * vertexNumber]= 0.0f;
                        normalsVector[3 * i + 2 + 2 * 3 * vertexNumber]= -1.0f;

                        texelVector[2 * i + 2 * 2 * vertexNumber]= texelVector[i];
                        texelVector[2 * i + 1 + 2 * 2 * vertexNumber]= 0.0f;

                        // Top Cap ends
                        verticeVector[3 * i + 3 * 3 * vertexNumber]= cosArray[i];
                        verticeVector[3 * i + 1 + 3 * 3 * vertexNumber]= sinArray[i];
                        verticeVector[3 * i + 2 + 3 * 3 * vertexNumber]= static_cast<float>(m_Length);

                        normalsVector[3 * i + 3 * 3 * vertexNumber]= 0.0f;
                        normalsVector[3 * i + 1 + 3 * 3 * vertexNumber]= 0.0f;
                        normalsVector[3 * i + 2 + 3 * 3 * vertexNumber]= 1.0f;

                        texelVector[2 * i + 3 * 2 * vertexNumber]= texelVector[i];
                        texelVector[2 * i + 1 + 3 * 2 * vertexNumber]= 0.0f;
                }
        }

        // Add bulk data in to the mesh
        GLC_Mesh::addVertice(verticeVector);
        GLC_Mesh::addNormals(normalsVector);
        GLC_Mesh::addTexels(texelVector);

        // Add polyline to wire data
        GLC_Geometry::addPolyline(bottomWireData);
        GLC_Geometry::addPolyline(topWireData);

        // Set the material to use
        GLC_Material* pCylinderMaterial;
        if (hasMaterial())
        {
                pCylinderMaterial= this->firstMaterial();
        }
        else
        {
                pCylinderMaterial= new GLC_Material();
        }

        IndexList circumferenceStrips;
        // Create the index
        for (int i= 0; i < vertexNumber; ++i)
        {
                circumferenceStrips.append(i + vertexNumber);
                circumferenceStrips.append(i);
        }
        addTrianglesStrip(pCylinderMaterial, circumferenceStrips);

        if (m_EndedIsCaped)
        {
                IndexList bottomCap;
                IndexList topCap;
                int id1= 0;
                int id2= m_Discret - 1;
                const int size= m_Discret / 2 + (m_Discret % 2);
                for (int i= 0; i < size; ++i)
                {
                        bottomCap.append(id1 + 2 * vertexNumber);
                        topCap.append(id2 + 3 * vertexNumber);

                        bottomCap.append(id2 + 2 * vertexNumber);
                        topCap.append(id1 + 3 * vertexNumber);

                        id1+= 1;
                        id2-= 1;
                }
                addTrianglesStrip(pCylinderMaterial, bottomCap);
                addTrianglesStrip(pCylinderMaterial, topCap);
        }

        finish();
}