/*-
 *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
 * 
 *  This file is part of CityDoctor2.
 *
 *  CityDoctor2 is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  CityDoctor2 is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with CityDoctor2.  If not, see <https://www.gnu.org/licenses/>.
 */
package de.hft.stuttgart.citydoctor2.math;

import de.hft.stuttgart.citydoctor2.datastructure.Polygon;

/**
 * Utility class for calculation concerning polygons
 * 
 * @author Matthias Betz
 *
 */
public class PolygonUtils {

	private PolygonUtils() {
		// only static utility
	}

	public static Matrix3x3d calculateRotationMatrix(Polygon p) {
		Vector3d normal = p.calculateNormalNormalized();
		Vector3d zAxis = new Vector3d(0d, 0d, 1d);
		Quaternion rot = Quaternion.fromToRotation(normal, zAxis);
		return rot.toRotationMatrix();
	}

}