package tesseract.objects;
import java.awt.Color;

import javax.media.j3d.*;
import javax.vecmath.*;

import common.CollidableObject;


/**
 * Sphere.
 * @author ?
 *
 */
public class Sphere extends PhysicalObject {
	/**
	 * 
	 */
	private static final long serialVersionUID = -8407634448268590714L;

	/**
	 * Default Object color.
	 */
	private static final Color3f DEFAULT_COLOR = new Color3f(0.7f, 0.7f, 1);
	
	/**
	 * Default divisions.
	 */
	private static final int DEFAULT_DIVISIONS = 22;
	
	/**
	 * User definable color.
	 */
	private final Color3f myColor;
	
	/**
	 * radius of sphere.
	 */
	public float radius;
	
	/**
	 * Constructor.
	 * @param theRadius of sphere.
	 * @param position to start.
	 */
	public Sphere(final float theRadius, final Vector3f position) {
		this(1, theRadius, position, DEFAULT_COLOR.get());
	}
	
	/**
	 * constructor.
	 * @param mass of object.
	 * @param theRadius of sphere.
	 * @param position of sphere.
	 * @param theColor of sphere.
	 */
	public Sphere(final float mass, final float theRadius,
			final Vector3f position, final Color theColor) {
		super(position, mass);
		myColor = new Color3f(theColor);
		radius = theRadius;
		setShape(createShape(DEFAULT_DIVISIONS));
		
		if (inverseMass != 0) {
			inverseInertiaTensor.m00 = 2f / 5 / inverseMass 
			* radius * radius;
			inverseInertiaTensor.m11 = inverseInertiaTensor.m00;
			inverseInertiaTensor.m22 = inverseInertiaTensor.m00;
			inverseInertiaTensor.invert();
		}
		updateTransformGroup();
	}

	/**
	 * createShape.
	 * @param divisions
	 * @return node
	 */
	protected Node createShape(final int divisions) {
		Appearance appearance = new Appearance();
		Material material = new Material();
		material.setDiffuseColor(myColor);
		appearance.setMaterial(material);
		return new com.sun.j3d.utils.geometry.Sphere(radius,
				com.sun.j3d.utils.geometry.Sphere.GENERATE_NORMALS,
				divisions, appearance);
	}
}