/* 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 <osgDB/ReadFile>

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

#include <osg/Camera>
#include <osg/MatrixTransform>

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

osgText::Text* createText(const std::string& textString, float xPosition)
{
  osgText::Text* returnValue = new osgText::Text;
  returnValue->setDataVariance(osg::Object::DYNAMIC);
  returnValue->setFont("fonts/times.ttf");
  returnValue->setCharacterSize(32.f);
  returnValue->setCharacterSizeMode(osgText::Text::SCREEN_COORDS);
  returnValue->setPosition(osg::Vec3(xPosition, -0.05, 0.0));
  returnValue->setAlignment(osgText::TextBase::CENTER_CENTER);
  returnValue->setAutoRotateToScreen(true);
  returnValue->setText(textString);

  // Note that adding a drop shadow makes text's alignment pretty far off.  This does
  // not seem to have a huge negative impact in my app, but was noticed during the copy
  // over to this demo.  Probably just an artifact of only having text in the scene?
  //returnValue->setBackdropType(osgText::Text::DROP_SHADOW_BOTTOM_RIGHT);
  return returnValue;
}

// create text which sits in 3D space such as would be inserted into a normal model
osg::Group* create3DText()
{
    osg::MatrixTransform* topXform = new osg::MatrixTransform;
    topXform->setName("Top Level Transform");
    // Real application adjusts this matrix on the fly as window resizes
    topXform->setMatrix(osg::Matrix(
        0.854637, 0, 0, 0,
        0, 1, 0, 0,
        0, 0, 1, 0,
        0.125313, 0, 0, 1
    ));

    // In real app, there are nodes between these two transforms

    osg::MatrixTransform* xformLayoutItem = new osg::MatrixTransform;
    xformLayoutItem->setName("VerticalLayout LayoutItem");
    // Real application adjusts this matrix on the fly as window resizes
    xformLayoutItem->setMatrix(osg::Matrix(
        1, 0, 0, 0,
        0, 0.920716, 0, 0,
        0, 0, 1, 0,
        0, 0.774936, 0, 1
    ));

    osgText::Text* text330 = createText("330", -0.166667);
    osgText::Text* text000 = createText("000", 0.0);
    osgText::Text* text030 = createText("030", 0.166667);
    osgText::Text* text060 = createText("060", 0.333334);

    topXform->addChild(xformLayoutItem);
    xformLayoutItem->addChild(text330);
    xformLayoutItem->addChild(text000);
    xformLayoutItem->addChild(text030);
    xformLayoutItem->addChild(text060);

    return topXform;
}

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

    // construct the viewer.
    osgViewer::Viewer viewer(arguments);

    // make sure the root node is group so we can add extra nodes to it.
    osg::Group* group = new osg::Group;
    group->addChild(create3DText());

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

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

    int width = 800;
    int height = 600;
    if (arguments.read("--size1"))
      ; // noop
    else if (arguments.read("--size2"))
      height = 100;
    else if (arguments.read("--size3"))
      width = 100;
    viewer.setUpViewInWindow(100, 100, width, height);

    // Configure an ortho-2D projection, using -1 and +1 as bounds
    osg::Camera* camera = viewer.getCamera();
    camera->getOrCreateStateSet()->setGlobalDefaults();
    camera->setProjectionMatrixAsOrtho2D(-1.f, 1.f, -1.f, 1.f);
    camera->setProjectionResizePolicy(osg::Camera::FIXED);
    camera->setViewMatrixAsLookAt(
      osg::Vec3d(0, 0, 100),
      osg::Vec3d(0, 0, 0),
      osg::Y_AXIS);

    viewer.run();

    return 0;
}