/*******************************************************************************
 * Copyright (c) 2012, 2013 Association for Decentralized Information Management in
 * Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.g3d.shape;

import java.util.ArrayList;
import java.util.List;

import javax.vecmath.AxisAngle4d;
import javax.vecmath.Vector3d;

import org.simantics.g3d.math.MathTools;

public class Cone {

	public static Mesh create(double radius, int s) {
		if (s < 3 || radius < MathTools.NEAR_ZERO)
			throw new IllegalArgumentException();
		List<Vector3d> vertices = new ArrayList<Vector3d>(s+2);
		List<Vector3d> normals = new ArrayList<Vector3d>(vertices.size());
		List<Integer> indices = new ArrayList<Integer>();
		
		vertices.add(new Vector3d(0.0,0.0,0.0));
		normals.add(new Vector3d(0.0,-1.0,0.0));
		vertices.add(new Vector3d(0.0,radius*2.0,0.0));
		normals.add(new Vector3d(0.0,1.0,0.0));
		
		Vector3d v = new Vector3d(radius,0,0);
		for (int i = 0; i < s; i++) {
			AxisAngle4d aa = new AxisAngle4d(0,1,0,((double)i/(double)s)*Math.PI * 2);
			Vector3d t = new Vector3d();
			MathTools.rotate(MathTools.getQuat(aa), v, t);
			vertices.add(t);
			Vector3d n = new Vector3d(t);
			n.normalize();
			normals.add(n);
		}
		
		for (int i = 0; i < s; i++) {
			indices.add(0);
			
			if (i < s - 1)
				indices.add(i + 3);
			else
				indices.add(2);
			indices.add(i + 2);
		}
		
		for (int i = 0; i < s; i++) {
			indices.add(1);
			indices.add(i + 2);
			if (i < s - 1)
				indices.add(i + 3);
			else
				indices.add(2);
			
		}
		return new Mesh(vertices,normals,indices);
		
	}
	
	public static void main(String arg[]) {
		Mesh s1 = create(1.0, 3);
		Mesh s2 = create(1.0, 4);
		System.out.println("debug " + s1 + "\n" + s2);
	}
}