/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGUTIL_DELAUNAYTRIANGULATOR_
#define OSGUTIL_DELAUNAYTRIANGULATOR_

#include <osg/ref_ptr>
#include <osg/Array>
#include <osg/Referenced>
#include <osg/CopyOp>
#include <osg/PrimitiveSet>

#include <osgUtil/Export>

namespace osgUtil 
{

/** Utility class that triangulates an irregolar network of sample points.
    Just create a DelaunayTriangulator, assign it the sample point array and call
    its triangulate() method to start the triangulation. Then you can obtain the
    generated primitive by calling the getTriangles() method.
*/
class OSGUTIL_EXPORT DelaunayTriangulator: public osg::Referenced {
public:

    DelaunayTriangulator();
    explicit DelaunayTriangulator(osg::Vec3Array *points, osg::Vec3Array *normals = 0);
    DelaunayTriangulator(const DelaunayTriangulator &copy, const osg::CopyOp &copyop = osg::CopyOp::SHALLOW_COPY);

    /// Get the const input point array.
    inline const osg::Vec3Array *getInputPointArray() const;

    /// Get the input point array.
    inline osg::Vec3Array *getInputPointArray();

    /// Set the input point array.
    inline void setInputPointArray(osg::Vec3Array *points);

    /// Get the const output normal array (optional).
    inline const osg::Vec3Array *getOutputNormalArray() const;

    /// Get the output normal array (optional).
    inline osg::Vec3Array *getOutputNormalArray();

    /// Set the output normal array (optional).
    inline void setOutputNormalArray(osg::Vec3Array *normals);

    /// Start triangulation.
    bool triangulate();

    /// Get the generated primitive (call triangulate() first).
    inline const osg::DrawElementsUInt *getTriangles() const;

    /// Get the generated primitive (call triangulate() first).
    inline osg::DrawElementsUInt *getTriangles();

protected:
    virtual ~DelaunayTriangulator();
    DelaunayTriangulator &operator=(const DelaunayTriangulator &) { return *this; }

private:
    osg::ref_ptr<osg::Vec3Array> points_;
    osg::ref_ptr<osg::Vec3Array> normals_;
    osg::ref_ptr<osg::DrawElementsUInt> prim_tris_;
};

// INLINE METHODS

inline const osg::Vec3Array *DelaunayTriangulator::getInputPointArray() const
{
    return points_.get();
}

inline osg::Vec3Array *DelaunayTriangulator::getInputPointArray()
{
    return points_.get();
}

inline void DelaunayTriangulator::setInputPointArray(osg::Vec3Array *points)
{
    points_ = points;
}

inline const osg::Vec3Array *DelaunayTriangulator::getOutputNormalArray() const
{
    return normals_.get();
}

inline osg::Vec3Array *DelaunayTriangulator::getOutputNormalArray()
{
    return normals_.get();
}

inline void DelaunayTriangulator::setOutputNormalArray(osg::Vec3Array *normals)
{
    normals_ = normals;
}

inline const osg::DrawElementsUInt *DelaunayTriangulator::getTriangles() const
{
    return prim_tris_.get();
}

inline osg::DrawElementsUInt *DelaunayTriangulator::getTriangles()
{
    return prim_tris_.get();
}

}

#endif