SphereSegment.h

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/*
 * This source file is part of the osgOcean library
 *
 * Copyright (C) 2009 Kim Bale
 * Copyright (C) 2009 The University of Hull, UK
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation; either version 3 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 Lesser General Public License for more details.
 * http://www.gnu.org/copyleft/lesser.txt.
 */

#pragma once
#include <osg/Geode>
#include <osg/Geometry>

class SphereSegment : public osg::Geode
{
public:
  SphereSegment(void);

  SphereSegment(float radius, unsigned int longitudeSteps, unsigned int lattitudeSteps, float longStart, float longEnd,
                float latStart, float latEnd);

  SphereSegment(const SphereSegment& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

protected:
  ~SphereSegment(void);

public:
  // 0 >= longStart/longEnd <= 180
  // 0 >= latStart/latEnd <= 360
  void compute(float radius, unsigned int longitudeSteps, unsigned int lattitudeSteps, float longStart, float longEnd,
               float latStart, float latEnd);
private:
  osg::Vec2 sphereMap(osg::Vec3& vertex, float radius);

  inline unsigned int idx(unsigned int r, unsigned int c, unsigned int row_len)
  {
    return c + r * row_len;
  }
};