/*
 * BallJ3D.java
 * Created on Feb 11, 2005
 */

package ball;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GraphicsConfiguration;

import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.ColoringAttributes;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;

import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.Sphere;
import com.sun.j3d.utils.universe.SimpleUniverse;

/**
 * @author gdennis
 *
 * A bouncing ball applet using Java 3D OpenGL
 */
public final class BallJ3D extends Applet {
	
	private static final float  RADIUS = 0.15f;
	private static final double SPEED  = 0.05;
	private static final Color  COLOR1 = Color.BLUE;
	private static final Color  COLOR2 = Color.RED;

	private SimpleUniverse universe = null;
	private Transform3D location = null;
	
    public BranchGroup createSceneGraph() {
    	// create the root of the branch graph
    	BranchGroup root = new BranchGroup();
    	
    	// create the ball that we will bounce
    	Color3f color = new Color3f(COLOR1);
    	ColoringAttributes colorAttribs
			= new ColoringAttributes(color, ColoringAttributes.SHADE_GOURAUD);
    	Appearance appear = new Appearance();
    	appear.setColoringAttributes(colorAttribs);
    	Sphere ball = new Sphere(RADIUS, appear);
    	
    	// create a transform group with the ball
    	TransformGroup trans = new TransformGroup();
    	trans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    	root.addChild(trans);
    	trans.addChild(ball);
    	
    	// add a bounce interpolator to the scene graph
    	BounceInterpolator bounce
			= new BounceInterpolator(RADIUS, SPEED,
					ball.getAppearance().getColoringAttributes(),
					COLOR1, COLOR2, trans);
    	BoundingSphere bounds =
    		new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);;
    	bounce.setSchedulingBounds(bounds);
    	root.addChild(bounce);

        // optimization scene graph and return it
        root.compile();
    	return root;
    }
	
	public void init() {
		// create 3d canvas
		GraphicsConfiguration config =
			SimpleUniverse.getPreferredConfiguration();
        Canvas3D canvas = new Canvas3D(config);
        
        // create universe
		BranchGroup scene = createSceneGraph();
		universe = new SimpleUniverse(canvas);
		// move ViewPlatform back a bit so objects can be viewed
    	universe.getViewingPlatform().setNominalViewingTransform();
		universe.addBranchGraph(scene);
	
		// add canvas to layout
		setLayout(new BorderLayout());
		add(canvas, BorderLayout.CENTER);
	}
	
    public void destroy() {
    	universe.cleanup();
    }

    public static void main(String[] args) {
    	new MainFrame(new BallJ3D(), 500, 500);
    }
	
}