Main.java Source code

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import java.io.File;

/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *
 */
public class Main {
    /** 2 π. */
    private static final double TWO_PI = 2 * Math.PI;

    /**
     * Normalize an angle in a 2&pi wide interval around a center value.
     * This method has three main uses:
     * <ul>
     *   <li>normalize an angle between 0 and 2&pi;:<br/>
     *       <code>a = MathUtils.normalizeAngle(a, Math.PI);</code></li>
     *   <li>normalize an angle between -&pi; and +&pi;<br/>
     *       <code>a = MathUtils.normalizeAngle(a, 0.0);</code></li>
     *   <li>compute the angle between two defining angular positions:<br>
     *       <code>angle = MathUtils.normalizeAngle(end, start) - start;</code></li>
     * </ul>
     * Note that due to numerical accuracy and since &pi; cannot be represented
     * exactly, the result interval is <em>closed</em>, it cannot be half-closed
     * as would be more satisfactory in a purely mathematical view.
     * @param a angle to normalize
     * @param center center of the desired 2&pi; interval for the result
     * @return a-2k&pi; with integer k and center-&pi; &lt;= a-2k&pi; &lt;= center+&pi;
     * @since 1.2
     */
    public static double normalizeAngle(double a, double center) {
        return a - TWO_PI * Math.floor((a + Math.PI - center) / TWO_PI);
    }

}