LOD_MeshBounds.h

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/*
 * $Id: LOD_MeshBounds.h 35147 2011-02-25 10:47:28Z jesterking $
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef NAN_INCLUDED_MeshBounds_h
#define NAN_INCLUDED_MeshBounds_h

#include "MEM_SmartPtr.h"
#include "LOD_MeshPrimitives.h"
#include "LOD_ManMesh2.h"
#include "MT_assert.h"

// simple class to compute the mesh bounds of a manifold mesh,

class LOD_MeshBounds {

public :
        static
                LOD_MeshBounds *
        New(
        ){

                MEM_SmartPtr<LOD_MeshBounds> output(new LOD_MeshBounds());              
                return output.Release();
        }

                void
        ComputeBounds(
                const LOD_ManMesh2 * mesh
        ){
                MT_assert(mesh!=NULL);
                MT_assert(mesh->VertexSet().size() > 0);

                const std::vector<LOD_Vertex> &verts = mesh->VertexSet(); 
                
                m_min = verts[0].pos;
                m_max = verts[0].pos;

                // iterate through the verts

                int t;
                const int size = verts.size();

                for (t=1; t< size ; ++t) {

                        UpdateBounds(verts[t].pos,m_min,m_max);
                }
        }
                                
                MT_Vector3
        Min(
        ) const {
                return m_min;
        }

                MT_Vector3
        Max(
        ) const {
                return m_max;
        }

private :

                void
        UpdateBounds(
                MT_Vector3 vertex,
                MT_Vector3& min,
                MT_Vector3& max
        ) {
                if (vertex.x() < min.x()) {
                        min.x() = vertex.x();
                } else
                if (vertex.x() > max.x()) {
                        max.x()= vertex.x();
                }

                if (vertex.y() < min.y()) {
                        min.y() = vertex.y();
                } else
                if (vertex.y() > max.y()) {
                        max.y()= vertex.y();
                }

                if (vertex.z() < min.z()) {
                        min.z() = vertex.z();
                } else
                if (vertex.z() > max.z()) {
                        max.z()= vertex.z();
                }
        }

        LOD_MeshBounds(
        ) :
                m_min(0,0,0),
                m_max(0,0,0)
        {
        };
                        
        MT_Vector3 m_min;
        MT_Vector3 m_max;

};

#endif