| /* |
| * 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); |
| } |
| |
| } |