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

/// @file HeightGrid.cpp

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

/// @date 2014.06.12

/// @brief Provide a simple interface to draw a height grid

///

/// @attention Copyright (C) 2014

/// @attention All rights reserved

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

#include "HeightGrid.h"

#include <osg/Geometry>

#include <osg/Geode>

#include <osg/ShapeDrawable>

namespace d3

{

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

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

osg::ref_ptr<osg::Node> get(const HeightGrid& heightGrid)

{

// get the height from the points - is there a better way?

uint height( heightGrid.points.size()/heightGrid.width );

// create the heightfield

osg::ref_ptr<osg::HeightField> heightField(new osg::HeightField());

heightField->allocate(height, heightGrid.width);

heightField->setXInterval(heightGrid.x_interval);

heightField->setYInterval(heightGrid.y_interval);

heightField->setOrigin(heightGrid.origin);

// set all the heights from the point cloud

auto iter(heightGrid.points.begin());

for ( uint ii(0) ; ii<height ; ++ii )

for ( uint jj(0) ; jj<heightGrid.width ; ++jj, ++iter )

heightField->setHeight(ii,jj,iter->location.z());

// create the shape

osg::ref_ptr<osg::ShapeDrawable> heightDrawable( new osg::ShapeDrawable(heightField) );

// set the color

heightDrawable->setColor(heightGrid.color);

// embed this in a geode

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

geode->addDrawable(heightDrawable);

// Let the thing be transparent

geode->getOrCreateStateSet()->setMode(GL_BLEND, osg::StateAttribute::ON);

geode->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

// return the geode

return geode;

};

} // namespace d3