1 files changed, 51 insertions, 0 deletions
diff --git a/src/java/org/apache/poi/sl/draw/geom/SinArcTanExpression.java b/src/java/org/apache/poi/sl/draw/geom/SinArcTanExpression.java
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index 0000000000..e14acb9e60
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+++ b/src/java/org/apache/poi/sl/draw/geom/SinArcTanExpression.java
@@ -0,0 +1,51 @@
+/*
+ *  ====================================================================
+ *    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));
+    }
+
+}