CoordinateAxes.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_COORDINATEAXES_
#define _OF_COORDINATEAXES_

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

namespace OpenFrames
{
  class OF_EXPORT CoordinateAxes : public ReferenceFrame
  {
  public:
    CoordinateAxes( const std::string &name );
    CoordinateAxes( 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 setAxisLength(double len);
    inline double getAxisLength() { return _axisLength; }

    void setDrawAxes(unsigned int axes);
    inline unsigned int getDrawAxes() const { return _drawAxes; }
    
    void setTickSpacing(double major_sp, double minor_sp);
    inline double getMajorTickSpacing() const { return _majorTickSpacing; }
    inline double getMinorTickSpacing() const { return _minorTickSpacing; }

    void setTickSize(unsigned majorSize, unsigned int minorSize);
    
    bool setTickImage(const std::string &fname);
        bool setTickShader(const std::string &fname );

    virtual const osg::BoundingSphere& getBound() const;
    virtual void setColor( const osg::Vec4 &color );
    using ReferenceFrame::setColor;

  protected:
    virtual ~CoordinateAxes();

    void _init();
    void _computeTickAttenuation();
    void _createAxes();

        void resetTickShader();

    double _axisLength; // Length of each axis
    double _majorTickSpacing, _minorTickSpacing; // Tick mark spacing
    unsigned int _drawAxes; // Which axes to draw

    osg::ref_ptr<osg::Geode> _axesGeode; // Node to hold axes geometry
    osg::ref_ptr<osg::Geode> _tickGeode; // Node to hold tick geometry

    osg::ref_ptr<osg::Geometry> _axesGeom;  // Geometry that draws axes
    osg::ref_ptr<osg::Geometry> _majorTickGeom; // Major tick marks geom
    osg::ref_ptr<osg::Geometry> _minorTickGeom; // Minor tick marks geom

    osg::ref_ptr<osg::Vec3dArray> _vertices; // Vertices that define the lines
    osg::ref_ptr<osg::Vec4Array> _colors;   // Colors for each line

        osg::ref_ptr<osg::Shader> _fragShader; // Tick mark fragment shader
  };

} // !namespace OpenFrames

#endif