/*
* ====================================================================
* 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.poi.sl.draw.geom;
import java.util.regex.Matcher;
/**
* Sine ArcTan Formula:
* <gd name="dy1" fmla="sat2 x y z"/>
*
* <p>
* Arguments: 3 (fmla="sat2 x y z")
* Usage: "sat2 x y z" = (x*sin(arctan(z / y))) = value of this guide
* </p>
*
* @author Yegor Kozlov
*/
public class SinArcTanExpression implements Expression {
private String arg1, arg2, arg3;
SinArcTanExpression(Matcher m){
arg1 = m.group(1);
arg2 = m.group(2);
arg3 = m.group(3);
}
public double evaluate(Context ctx){
double x = ctx.getValue(arg1);
double y = ctx.getValue(arg2);
double z = ctx.getValue(arg3);
return x*Math.sin(Math.atan(z / y));
}
}