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);
	}
}