/* File: ex_cone.cpp
*/

#include <osg/Notify>
#include <osg/MatrixTransform>
#include <osg/ShapeDrawable>
#include <osg/Geometry>
#include <osgUtil/Optimizer>
#include <osgGA/TrackballManipulator>
#include <osgViewer/Viewer>
#include <iostream>

using namespace osg;

void usage()
{
    std::cout << "usage: ex_cone\n";
    exit(0);
}

int main( int argc, char **argv )
{
    if (argc != 1)
        usage();

    // initialize the viewer.
    osgViewer::Viewer viewer;

    // create parameters to define a cone
    float radius = 2.0;
    float height = 2.0;
    float xcen = 0.0f;
    float ycen = 0.0f;
    float zcen = 0.0f;
    float color[4] = {0.5, 0.5, 0.8, 1.0};

    // Create a vector to represent the "center of the cone"
    Vec3 vcen(xcen, ycen, zcen);
    Cone* cone = new Cone(vcen, radius, height);

    // Create a drawable object based on the cone
    ShapeDrawable *drawable = new ShapeDrawable(cone);
    drawable->setColor(Vec4(color[0], color[1], color[2], color[3]));
    Geode* geode = new Geode();
    geode->addDrawable(drawable);

    // tilt the scene so the default eye position is looking down on the model.
    // and add the cone geode
    MatrixTransform* rootnode = new MatrixTransform;
    rootnode->setMatrix(Matrix::rotate(inDegrees(30.0), 1.0, 0.0, 0.0));
    rootnode->addChild(geode);

    // run optimization over the scene graph
    osgUtil::Optimizer optimzer;
    optimzer.optimize(rootnode);
     
    // set the scene to render
    viewer.setSceneData(rootnode);
    viewer.setCameraManipulator(new osgGA::TrackballManipulator());

    // normal viewer usage.
    return viewer.run();
}