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diff --git a/chart2/source/view/inc/PolarLabelPositionHelper.hxx b/chart2/source/view/inc/PolarLabelPositionHelper.hxx
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+++ b/chart2/source/view/inc/PolarLabelPositionHelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   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 .
+ */
+
+#pragma once
+
+#include "LabelPositionHelper.hxx"
+#include <com/sun/star/awt/Point.hpp>
+
+namespace chart
+{
+
+class PolarPlottingPositionHelper;
+
+class PolarLabelPositionHelper final : public LabelPositionHelper
+{
+public:
+    PolarLabelPositionHelper(
+        PolarPlottingPositionHelper* pPosHelper
+        , sal_Int32 nDimensionCount
+        , const rtl::Reference<SvxShapeGroupAnyD>& xLogicTarget );
+    virtual ~PolarLabelPositionHelper() override;
+
+    css::awt::Point getLabelScreenPositionAndAlignmentForLogicValues(
+                        LabelAlignment& rAlignment
+                        , double fLogicValueOnAngleAxis
+                        , double fLogicValueOnRadiusAxis
+                        , double fLogicZ
+                        , sal_Int32 nScreenValueOffsetInRadiusDirection ) const;
+
+    /** Calculate the anchor point position for a text label.
+     *  When the requested label placement is of `INSIDE` or `OUTSIDE` type the
+     *  returned anchor point for the text label is the middle point of the
+     *  outer arc for the given slice; when the requested label placement is of
+     *  `CENTER` type the returned anchor point for the text label is the
+     *  middle point of the line segment bisecting the slice.
+     *  The text alignment is always centered when the requested label
+     *  placement is of `CENTER` type else it is dependent on the value of the
+     *  angle defined by the horizontal axis and the ray bisecting the slice.
+     *
+     */
+    css::awt::Point getLabelScreenPositionAndAlignmentForUnitCircleValues(
+                        LabelAlignment& rAlignment, sal_Int32 nLabelPlacement /*see css::chart::DataLabelPlacement*/
+                        , double fUnitCircleStartAngleDegree, double fUnitCircleWidthAngleDegree
+                        , double fUnitCircleInnerRadius, double fUnitCircleOuterRadius
+                        , double fLogicZ
+                        , sal_Int32 nScreenValueOffsetInRadiusDirection ) const;
+
+private:
+    PolarPlottingPositionHelper*    m_pPosHelper;
+};
+
+} //namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */