/*
* 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.
*/
package org.apache.lucene.spatial3d.geom;
/**
* Static methods globally useful for 3d geometric work.
*
* @lucene.experimental
*/
public class Tools {
private Tools() {
}
/**
* Java acos yields a NAN if you take an arc-cos of an
* angle that's just a tiny bit greater than 1.0, so
* here's a more resilient version.
*/
public static double safeAcos(double value) {
if (value > 1.0)
value = 1.0;
else if (value < -1.0)
value = -1.0;
return Math.acos(value);
}
}