source: osgVisual/src/draw2D/visual_debug_hud.cpp @ 59

/* -*-c++-*- osgVisual - Copyright (C) 2009-2010 Torben Dannhauer
 *
 * This library is based on OpenSceneGraph, open source and may be redistributed and/or modified under 
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
 * You have to aquire licenses for all used proprietary modules.
 * 
 * This library 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
 * OpenSceneGraph Public License for more details.
*/

#include <visual_debug_hud.h>

using namespace osgVisual;

visual_debug_hud::visual_debug_hud(void)
{

}

visual_debug_hud::~visual_debug_hud(void)
{
}

bool visual_debug_hud::init( osgViewer::Viewer *viewer_, osg::CoordinateSystemNode* rootNode_  )
{       



    screen_width = viewer_->getCamera()->getViewport()->width();
    screen_height = viewer_->getCamera()->getViewport()->height();
        
        visual_draw2D::getInstance()->addDrawContent( addContent(), "HUD" );

        // Set callback.
        updateCallback = new HudUpdateCallback( rootNode_, viewer_->getCamera() );
        this->setEventCallback( updateCallback );

        isInitialized = true;

        return true;
}

void visual_debug_hud::shutdown()
{
        if (isInitialized)
        {       
                // Remove updatecallback
                this->removeUpdateCallback( updateCallback );
                updateCallback = NULL;
        }
}

osg::ref_ptr<osg::Geode> visual_debug_hud::addContent()
{
        osg::ref_ptr<osg::Geode> hudGeode = this;

        // turn lighting off
        osg::ref_ptr<osg::StateSet> stateset = hudGeode->getOrCreateStateSet();
    stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);


    
        // Add Text: 
        osg::Vec3 position(screen_width-180.0f,120.0f,0.0f);
        osg::Vec3 delta(0.0f,-25.0f,0.0f);
        std::string timesFont("fonts/arial.ttf");
        {
                textLat = new osgText::Text;
                hudGeode->addDrawable( textLat );
                textLat->setFont(timesFont);
                textLat->setPosition(position);
                textLat->setCharacterSize(21);
                textLat->setDataVariance(osg::Object::DYNAMIC); 

                position += delta;

                textLon = new osgText::Text;
                hudGeode->addDrawable( textLon );
                textLon->setFont(timesFont);
                textLon->setPosition(position);
                textLon->setCharacterSize(21);
                textLon->setDataVariance(osg::Object::DYNAMIC); 

                position += delta;

                textAlt = new osgText::Text;
                hudGeode->addDrawable( textAlt );
                textAlt->setFont(timesFont);
                textAlt->setPosition(position);
                textAlt->setCharacterSize(21);
                textAlt->setDataVariance(osg::Object::DYNAMIC); 

                position += delta;

                textHat = new osgText::Text;
                hudGeode->addDrawable( textHat );
                textHat->setFont(timesFont);
                textHat->setPosition(position);
                textHat->setCharacterSize(21);
                textHat->setDataVariance(osg::Object::DYNAMIC); 

                position += delta;

                textHot = new osgText::Text;
                hudGeode->addDrawable( textHot );
                textHot->setFont(timesFont);
                textHot->setPosition(position);
                textHot->setCharacterSize(21);
                textHot->setDataVariance(osg::Object::DYNAMIC); 

                position += delta;
        }

        return hudGeode.get();
}

void visual_debug_hud::HudUpdateCallback::operator()(osg::Node* node, osg::NodeVisitor* nv)
{
        visual_debug_hud* hud = dynamic_cast<visual_debug_hud*>(node);
        if ( !hud )
        {
                OSG_NOTIFY(osg::FATAL) << "ERROR : No object found. Unable to apply this callback!" << std::endl;
                return;
        }

        // Retrieving new HUD values

        double lat = 0;
        double lon = 0;
        double hat = 0;
        double hot = 0;
        double alt = 0;

        util::getWGS84ofCamera( sceneCamera, csn, lat, lon, alt ); 
        util::queryHeightAboveTerrainInWGS84(hat, csn, lat, lon, alt);
        util::queryHeightOfTerrain(hot, csn, lat, lon);


        // Updating Display Elements:
        std::ostringstream valuestring;
        
        valuestring.str("");
        valuestring << osg::RadiansToDegrees( lat );
        hud->textLat->setText("LAT: "+valuestring.str());

        valuestring.str("");
        valuestring << osg::RadiansToDegrees( lon );
        hud->textLon->setText("LON: "+valuestring.str());

        valuestring << std::fixed;
        valuestring.precision(2);
        valuestring.fill('0');

        valuestring.width(8);
        valuestring.str("");
        valuestring << alt;
        hud->textAlt->setText("ALT: "+valuestring.str());


        valuestring.width(8);
        valuestring.str("");
        valuestring << hat;
        hud->textHat->setText("HAT: "+valuestring.str());

        valuestring.width(8);
        valuestring.str("");
        valuestring << hot;
        hud->textHot->setText("HOT: "+valuestring.str());
}