import java.awt.Frame;
import java.awt.GraphicsConfiguration;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.media.j3d.AmbientLight;
import javax.media.j3d.Background;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.Bounds;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.utils.behaviors.vp.OrbitBehavior;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.universe.ViewingPlatform;


public class CelestialApp extends Frame {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new CelestialApp();
    }

    private SimpleUniverse universe = null;

    public CelestialApp() {
        super("Celestial Physics 3D");
        setSize(1024, 768);

        GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
        Canvas3D defaultCanvas = new Canvas3D(config);
        add("Center", defaultCanvas);
        setVisible(true);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                dispose();
                System.exit(0);
            }
        });


        BranchGroup scene = constructContentBranch();
        scene.compile();

        universe = new SimpleUniverse(defaultCanvas);
        setupView();
        universe.addBranchGraph(scene);
    }

    private void setupView() {
        ViewingPlatform vp =  universe.getViewingPlatform();
        OrbitBehavior orbit = new OrbitBehavior();
        orbit.setSchedulingBounds(new BoundingSphere(new Point3d(0.0f, 0.0f, 0.0f), 10000.0f));
        vp.setNominalViewingTransform();
        vp.setViewPlatformBehavior(orbit);
    }

    private BranchGroup constructContentBranch() {
        BranchGroup scene = new BranchGroup();

        CelestialBody body1 = new CelestialBody(-2.0f, 0.0f, 0.0f);
        scene.addChild(body1);

        CelestialBody body2 = new CelestialBody(2.0f, 0.0f, -1.1f);
        scene.addChild(body2);

        PhysicalBehavior physics1 = new PhysicalBehavior(body1);
        scene.addChild(physics1);

        PhysicalBehavior physics2 = new PhysicalBehavior(body2, new Vector3d(0.0f, 0.0f, 0.0f));
        scene.addChild(physics2);

        setupLights(scene);

        return scene;
    }

    private void setupLights(BranchGroup scene) {
        AmbientLight lightA = new AmbientLight();
        lightA.setInfluencingBounds(new BoundingSphere());
        lightA.setColor(new Color3f(0.3f, 0.3f, 0.3f));
        scene.addChild(lightA);

        DirectionalLight lightD1 = new DirectionalLight();
        lightD1.setInfluencingBounds(new BoundingSphere());
        Vector3f dir = new Vector3f(-0.3f, -1.0f, -0.5f);
        dir.normalize();
        lightD1.setDirection(dir);
        lightD1.setColor(new Color3f(1.0f, 1.0f, 1.0f));
        scene.addChild(lightD1);

        Background bg = new Background(0.0f, 0.0f, 0.0f);
        bg.setApplicationBounds(new BoundingSphere());
        scene.addChild(bg);
    }
}