import javax.vecmath.*;
import javax.media.j3d.*;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
import java.awt.GraphicsConfiguration;
import java.awt.BorderLayout;
import java.awt.Label;
import java.awt.*;
import javax.swing.*;
import java.applet.Applet;
//import java.*;

public class HelloUniverse extends Applet
{
	public BranchGroup createSceneGraph()
	{
        // Create the root of the branch graph
        BranchGroup objRoot = new BranchGroup();

        // Create the TransformGroup node and initialize it to the
        // identity. Enable the TRANSFORM_WRITE capability so that
        // our behavior code can modify it at run time. Add it to
        // the root of the subgraph.
        TransformGroup objTrans = new TransformGroup();
        objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        objRoot.addChild(objTrans);

        Appearance ap = new Appearance();
        ColoringAttributes ca = new ColoringAttributes(0.1f,0.3f,0.3f,0);

        // Create a simple Shape3D node; add it to the scene graph.
//
        objTrans.addChild(new ColorCube(0.4));
//        ap = new Appearance();
//        ca = new ColoringAttributes(0.7f,0.3f,0.3f,0);
//        ap.setColoringAttributes(ca);
//        objTrans.addChild(new Cone(0.43f, 0.2f, ap));

        // Create a new Behavior object that will perform the
        // desired operation on the specified transform and add
        // it into the scene graph.
        Transform3D yAxis = new Transform3D();
        Alpha rotationAlpha = new Alpha(-1, 4000);

        RotationInterpolator rotator = new RotationInterpolator(
                rotationAlpha, objTrans, yAxis, 0.0f, (float) Math.PI*2.0f
        );

        BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
        rotator.setSchedulingBounds(bounds);
        objRoot.addChild(rotator);

        // Have Java 3D perform optimizations on this scene graph.
        objRoot.compile();

        return objRoot;
    }

	public HelloUniverse()
    {
		///<set layout of applet, construct canvas3d, add canvas3d>
		setLayout(new GridLayout(1,2));
		GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
		Canvas3D canvas3d = new Canvas3D(config);

		JPanel panel = new JPanel();
		panel.setLayout(new BorderLayout());

		JButton addJoint = new JButton("add a joint");
		JPanel panelJoints = new JPanel();

		panelJoints.setLayout(new FlowLayout());
		AddJoint listener = new AddJoint(this, panelJoints);
		addJoint.addActionListener(listener);

		//add("North", addJoint);
		add(canvas3d);
		add(panel);
		panel.add("North", addJoint);
		panel.add("Center", panelJoints);

		// Create the scene; attach it to the virtual universe
		BranchGroup scene = createSceneGraph();
        SimpleUniverse u = new SimpleUniverse(canvas3d);
        u.getViewingPlatform().setNominalViewingTransform();
        u.addBranchGraph(scene);

    }

}