/home/jgoppert/Projects/uvsim/uvsim/src/uvsim/visualization/PointCloud.cc

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/*
 * PointCloud.cc
 * Copyright (C) James Goppert 2009 <jgoppert@users.sourceforge.net>
 *
 * PointCloud.cc is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PointCloud.cc 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "PointCloud.h"

namespace uvsim
{

void PointCloudCallback::operator()(osg::Node *node, osg::NodeVisitor *nv)
{
    osg::ref_ptr<PointCloud> pointCloud = dynamic_cast<PointCloud*>
                                          (node->getUserData());
    if (pointCloud.get())
    {
        //std::cout << "Object found" << std::endl;
        (pointCloud.get())->updateSize();
    }
    //std::cout << "In call back" << std::endl;
}

PointCloud::PointCloud()
{
}

PointCloud::PointCloud(int pointSize, osg::Vec3Array * points, osg::Vec4Array * colors) :
        points(points), root(new osg::PositionAttitudeTransform), geom(new osg::Geometry),
        geode(new osg::Geode), colors(colors),
        drawArrays(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, points->size()))
{
    root->setUpdateCallback(new PointCloudCallback);
    root->addChild(geode.get());
    geode->setStateSet(makeStateSet(pointSize));
    geode->addDrawable(geom.get());
    geom->setVertexArray(points);
    geom->setColorArray(colors);
    geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
    geom->addPrimitiveSet(drawArrays.get());
}

PointCloud::~PointCloud()
{
}

void PointCloud::updateSize()
{
    (drawArrays.get())->setCount(points->size());
    (geom.get())->dirtyDisplayList();
}

osg::StateSet* PointCloud::makeStateSet(float size)
{
    osg::StateSet *set = new osg::StateSet();

    //set->setMode(GL_BLEND, osg::StateAttribute::ON);
    //osg::BlendFunc *fn = new osg::BlendFunc();
    //fn->setFunction(osg::BlendFunc::SRC_ALPHA, osg::BlendFunc::DST_ALPHA);
    //set->setAttributeAndModes(fn, osg::StateAttribute::ON);

    osg::PointSprite *sprite = new osg::PointSprite();
    set->setTextureAttributeAndModes(0, sprite, osg::StateAttribute::ON);

    osg::Point *point = new osg::Point();
    point->setSize(size);
    set->setAttribute(point);

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

    osg::Texture2D *tex = new osg::Texture2D();
    tex->setImage(osgDB::readImageFile(std::string(DATADIR)+="/textures/particle.rgb"));
    set->setTextureAttributeAndModes(0, tex, osg::StateAttribute::ON);

    return set;
}

} // uvsim


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