#include "CameraProperty.h"

using namespace gsc;

void CameraProperty::setToModel(const osg::Node* node)
{
    osg::BoundingSphere bs = node->getBound();

    double screenWidth = osg::DisplaySettings::instance()->getScreenWidth();
    double screenHeight = osg::DisplaySettings::instance()->getScreenHeight();
    double screenDistance = osg::DisplaySettings::instance()->getScreenDistance();
    
    double vfov = atan2(screenHeight/2.0,screenDistance)*2.0;
    double hfov = atan2(screenWidth/2.0,screenDistance)*2.0;
    double viewAngle = vfov<hfov ? vfov : hfov;

    double dist = bs.radius() / sin(viewAngle*0.5);

    // dist = osg::DisplaySettings::instance()->getScreenDistance();

    _center = bs.center();
    _eye = _center - osg::Vec3d(0.0, dist, 0.0);
    _up = osg::Vec3d(0.0, 0.0, 1.0);
    
    _rotationCenter = _center;
    _rotationAxis = osg::Vec3d(0.0, 0.0, 1.0);
    _rotationSpeed = 0.0;
}


void CameraProperty::update(osgViewer::View* view)
{
    osg::Camera* camera = view->getCamera();
    osg::FrameStamp* fs = view->getFrameStamp();

    osg::Matrixd matrix;
    matrix.makeLookAt(_eye, _center, _up);

    if (_rotationSpeed!=0.0)
    {
        matrix.preMult(osg::Matrixd::translate(-_rotationCenter) *
                    osg::Matrix::rotate(osg::DegreesToRadians(_rotationSpeed*fs->getSimulationTime()), _rotationAxis) *
                    osg::Matrixd::translate(_rotationCenter));
    }
    
    camera->setViewMatrix( matrix );
}


/////////////////////////////////////////////////////////////////////////////////////////
//
// Serialization support
//
REGISTER_OBJECT_WRAPPER( gsc_CameraProperty,
                         new gsc::CameraProperty,
                         gsc::CameraProperty,
                         "osg::Object gsc::CameraProperty" )
{
    ADD_VEC3D_SERIALIZER( Center, osg::Vec3d(0.0,0.0,0.0) );
    ADD_VEC3D_SERIALIZER( EyePoint, osg::Vec3d(0.0,-1.0,0.0) );
    ADD_VEC3D_SERIALIZER( UpVector, osg::Vec3d(0.0,0.0,1.0) );
    ADD_VEC3D_SERIALIZER( RotationCenter, osg::Vec3d(0.0,0.0,0.0) );
    ADD_VEC3D_SERIALIZER( RotationAxis, osg::Vec3d(0.0,0.0,1.0) );
    ADD_DOUBLE_SERIALIZER( RotationSpeed, 0.0 );
    
}