/* OpenSceneGraph example, osgtext.
*
*  Permission is hereby granted, free of charge, to any person obtaining a copy
*  of this software and associated documentation files (the "Software"), to deal
*  in the Software without restriction, including without limitation the rights
*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
*  copies of the Software, and to permit persons to whom the Software is
*  furnished to do so, subject to the following conditions:
*
*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
*  THE SOFTWARE.
*/

#include <osgGA/StateSetManipulator>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>

#include <osg/Geode>
#include <osg/Camera>

#include <osgText/Font>
#include <osgText/Text>

osg::Group* createHUDText()
{
    osg::Group* rootNode = new osg::Group;

    osg::ref_ptr<osgText::Font> font = osgText::readRefFontFile("fonts/arial.ttf");
    osg::Geode* geode  = new osg::Geode;
    rootNode->addChild(geode);

    osg::Vec4 layoutColor(1.0f,1.0f,0.0f,1.0f);
    float layoutCharacterSize = 24.0f;

    {
        osgText::Text* text = new osgText::Text;
        text->setFont(font);
        text->setColor(layoutColor);
        text->setCharacterSize(layoutCharacterSize);
        text->setCharacterSizeMode(osgText::TextBase::SCREEN_COORDS);
        text->setAxisAlignment(osgText::TextBase::SCREEN);
        text->setPosition(osg::Vec3(0.125,0.1,0.0f));

        text->setText("Horizontal Text");
        geode->addDrawable(text);
    }

    {
        osgText::Text* text = new osgText::Text;
        text->setFont(font);
        text->setColor(layoutColor);
        text->setCharacterSize(layoutCharacterSize);
        text->setCharacterSizeMode(osgText::TextBase::SCREEN_COORDS);
        text->setAxisAlignment(osgText::TextBase::SCREEN);
        text->setPosition(osg::Vec3(0.1, 0.1, 0.0f));
        text->setRotation(osg::Quat(osg::PI_2, osg::Vec3(0, 0, 1)));

        text->setText("Vertical Text");
        geode->addDrawable(text);
    }

    return rootNode;
}


int main(int argc, char** argv)
{
    osg::ArgumentParser arguments(&argc, argv);

    // construct the viewer.
    osgViewer::Viewer viewer(arguments);
    viewer.setUpViewInWindow(100, 100, 800, 300);

    // make sure the root node is group so we can add extra nodes to it.
    osg::Group* group = new osg::Group;

    // create the hud.
    osg::Camera* camera = new osg::Camera;
    camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
    camera->setProjectionMatrixAsOrtho2D(0, 1, 0, 1);
    camera->setProjectionResizePolicy(osg::Camera::FIXED);
    camera->setViewMatrix(osg::Matrix::identity());
    camera->setClearMask(GL_DEPTH_BUFFER_BIT);
    camera->addChild(createHUDText());
    camera->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

    group->addChild(camera);

    // set the scene to render
    viewer.setSceneData(group);

    viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
    viewer.addEventHandler(new osgViewer::StatsHandler());

    viewer.run();

    return 0;
}