/*
* ====================================================================
* 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;
/**
* Tangent Formula:
*
* <gd name="z" fmla="tan x y"/>
*
* <p>
* Arguments: 2 (fmla="tan x y")
* Usage: "tan x y" = (x * tan( y )) = value of this guide
* </p>
*
* @author Yegor Kozlov
*/
public class TanExpression implements Expression {
private String arg1, arg2;
TanExpression(Matcher m){
arg1 = m.group(1);
arg2 = m.group(2);
}
public double evaluate(Context ctx){
double x = ctx.getValue(arg1);
double y = ctx.getValue(arg2);
return x * Math.tan(Math.toRadians(y / 60000));
}
}