LatLonGrid.hpp

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/***********************************
   Copyright 2018 Ravishankar Mathur

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
***********************************/

#ifndef _OF_LATLONGRID_
#define _OF_LATLONGRID_

#include <OpenFrames/Export.h>
#include <OpenFrames/ReferenceFrame.hpp>
#include <osg/Geometry>
#include <osg/ref_ptr>

namespace OpenFrames
{
  class OF_EXPORT LatLonGrid : public ReferenceFrame
  {
  public:
    LatLonGrid( const std::string &name );
    LatLonGrid( const std::string &name, float r, float g, float b, float a = 1.0 );

    // Show/hide this frame's contents, e.g. everything a frame shows (excluding axes, labels, and children)
    // Inherited from ReferenceFrame
    virtual void showContents(bool showContents);
    virtual bool getContentsShown() const;

    void setParameters(const double &radius, const double &latSpace, const double &lonSpace);
    void getParameters(double &radius, double &latSpace, double &lonSpace) const;

    virtual const osg::BoundingSphere& getBound() const;

    virtual void setColor( const osg::Vec4 &color );
    using ReferenceFrame::setColor; // Unhide inherited setColor

  protected:
    virtual ~LatLonGrid();

    void _init();
    void _createGrid();

    double _latSpacing, _lonSpacing; // Grid line spacing, in radians
    double _radius; // Radius of sphere

    osg::ref_ptr<osg::Geode> _geode;  // Node to hold grid geometry
    osg::ref_ptr<osg::Geometry> _gridGeom; // Geometry that draws everything
    osg::ref_ptr<osg::Geometry> _mainGeom; // For equator and prime meridian
    osg::ref_ptr<osg::Vec3Array> _vertices; // Vertices that define the grid
    osg::ref_ptr<osg::Vec4Array> _colors; // Colors
  };

} // !namespace OpenFrames

#endif