Math_atan2.java

/*
 * 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
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package org.apache.jena.sparql.function.library;

import org.apache.jena.sparql.expr.NodeValue ;
import org.apache.jena.sparql.function.FunctionBase2 ;

//Summary
// Returns the angle in radians subtended at the origin by
// the point on a plane with coordinates (x, y) and the positive x-axis,
// the result being in the range -π to +π.
// math:atan2($y as xs:double, $x as xs:double) as xs:double

public class Math_atan2 extends FunctionBase2 {

    @Override
    public NodeValue exec(NodeValue v1, NodeValue v2) {
        double d = Math.atan2(v1.getDouble(), v2.getDouble()) ; 
        return NodeValue.makeDouble(d) ;
    }
}