/////////////////////////////////////////////////////////////////

/// @file Points.cpp

/// @author Chris L Baker (clb) <chris@chimail.net>

/// @date 2014.05.20

/// @brief Provide a simple interface to draw a point

///

/// @attention Copyright (C) 2014

/// @attention All rights reserved

/////////////////////////////////////////////////////////////////

#include "Colors.h"

#include "Points.h"

#include <osg/Geometry>

#include <osg/Point>

#include <osg/Geode>

#include <osg/Version>

namespace d3

{

/////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////

osg::ref_ptr<osg::Node> get(const PointVec_t& points,

const float size)

{

// the color array

osg::ref_ptr<osg::Vec4Array> osgColors( new osg::Vec4Array() );

osgColors->reserve(points.size());

// the vertex array

osg::ref_ptr<osg::Vec3Array> verts( new osg::Vec3Array() );

verts->reserve(points.size());

// the actual cloud indices

osg::ref_ptr<osg::DrawElementsUInt>

theCloud( new osg::DrawElementsUInt(osg::PrimitiveSet::POINTS, 0) );

theCloud->reserveElements(points.size());

// add the points and colors - only iterate the list once so we know we have

// the right number of points and colors

unsigned int index(0);

for ( const Point& pt : points )

{

verts->push_back(pt.location);

osgColors->push_back(pt.color);

theCloud->push_back(index++);

}

// now add all this stuff to the geometry object

osg::ref_ptr<osg::Geometry> cloudGeometry( new osg::Geometry() );

cloudGeometry->setVertexArray(verts);

#if OSG_MIN_VERSION_REQUIRED(3,2,0)

cloudGeometry->setColorArray(osgColors, osg::Array::Binding::BIND_PER_VERTEX);

#else // OSG_MIN_VERSION_REQUIRED(3,2,0)

cloudGeometry->setColorArray(osgColors);

cloudGeometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);

#endif // OSG_MIN_VERSION_REQUIRED(3,2,0)

cloudGeometry->addPrimitiveSet(theCloud);

// set the state - point size and lighting

osg::ref_ptr<osg::StateSet> cloudStateSet( cloudGeometry->getOrCreateStateSet() );

cloudStateSet->setAttribute(new osg::Point(size), osg::StateAttribute::ON);

cloudStateSet->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

// build the geode to return

osg::ref_ptr<osg::Geode> geode(new osg::Geode());

geode->addDrawable(cloudGeometry);

return geode;

};

} // namespace d3