TextHUD.h

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/* 
 * Copyright (c) 2013 University of Jaume-I.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Mario Prats
 *     Javier Perez
 */

// ----------------------------------------------------
//                  Text HUD Class
// ----------------------------------------------------
#include <osg/PositionAttitudeTransform>

class TextHUD : public osg::Referenced
{
private:
  osg::ref_ptr<osg::Camera> _camera;
  osg::ref_ptr<osgText::Text> _modeText;
  osg::ref_ptr<osgText::Text> _cameraModeText;

public:
  TextHUD(void)
  {
    _camera = createCamera();
    _camera->addChild(createText());
  }

  osg::Camera* createCamera(void)
  {
    osg::ref_ptr<osg::Camera> camera = new osg::Camera;

    camera->setViewport(0, 0, 1024, 768);
    camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
    camera->setProjectionMatrixAsOrtho2D(0, 1024, 0, 768);
    camera->setRenderOrder(osg::Camera::POST_RENDER);
    camera->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
    camera->setClearMask(GL_DEPTH_BUFFER_BIT);
//      camera->setProjectionResizePolicy(osg::Camera::VERTICAL);

    return camera.release();
  }

  osg::Node* createText(void)
  {
    osg::Geode* textGeode = new osg::Geode;

    osgText::Text* title = new osgText::Text;
    //title->setFont("fonts/arial.ttf");
    title->setCharacterSize(24);
    title->setLineSpacing(0.4f);

    std::string versionText = std::string("\nPress 'h' for options");

    title->setText(versionText);
    textGeode->addDrawable(title);

    _modeText = new osgText::Text;
    //_modeText->setFont("fonts/arial.ttf");
    _modeText->setCharacterSize(24);
    _modeText->setPosition(osg::Vec3f(0.f, -40.f, 0.f));
    _modeText->setDataVariance(osg::Object::DYNAMIC);
    textGeode->addDrawable(_modeText.get());

    _cameraModeText = new osgText::Text;
    //_cameraModeText->setFont("fonts/arial.ttf");
    _cameraModeText->setCharacterSize(24);
    _cameraModeText->setPosition(osg::Vec3f(0.f, -60.f, 0.f));
    _cameraModeText->setDataVariance(osg::Object::DYNAMIC);
    //textGeode->addDrawable( _cameraModeText.get() );

    osg::PositionAttitudeTransform* titlePAT = new osg::PositionAttitudeTransform;
    titlePAT->setPosition(osg::Vec3f(10, 70, 0.f));
    //titlePAT->addChild(textGeode);

    return titlePAT;
  }

  void setSceneText(const std::string& preset)
  {
    _modeText->setText("\nWeather: " + preset + "\n");
  }

  void setCameraText(const std::string& mode)
  {
    _cameraModeText->setText("Camera: " + mode);
  }

  osg::Camera* getHudCamera(void)
  {
    return _camera.get();
  }
};