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diff --git a/chart2/source/inc/RegressionCurveHelper.hxx b/chart2/source/inc/RegressionCurveHelper.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 <svx/chrtitem.hxx>
+#include "charttoolsdllapi.hxx"
+#include <rtl/ref.hxx>
+
+#include <vector>
+
+namespace com::sun::star::beans { class XPropertySet; }
+namespace com::sun::star::chart2 { class XDataSeries; }
+namespace com::sun::star::chart2 { class XDiagram; }
+namespace com::sun::star::chart2 { class XRegressionCurve; }
+namespace com::sun::star::chart2 { class XRegressionCurveCalculator; }
+namespace com::sun::star::chart2 { class XRegressionCurveContainer; }
+namespace com::sun::star::chart2::data { class XDataSource; }
+namespace com::sun::star::frame { class XModel; }
+namespace chart { class ChartModel; }
+namespace chart { class DataSeries; }
+namespace chart { class Diagram; }
+namespace chart { class RegressionCurveModel; }
+
+namespace chart::RegressionCurveHelper
+{
+    /// returns a model mean-value line
+    rtl::Reference<::chart::RegressionCurveModel> createMeanValueLine();
+
+    /// returns a model regression curve
+    rtl::Reference<::chart::RegressionCurveModel>
+        createRegressionCurveByServiceName( std::u16string_view aServiceName );
+
+    OOO_DLLPUBLIC_CHARTTOOLS bool hasMeanValueLine(
+        const css::uno::Reference<css::chart2::XRegressionCurveContainer> & xRegCnt );
+    OOO_DLLPUBLIC_CHARTTOOLS bool hasMeanValueLine(
+        const rtl::Reference<::chart::DataSeries> & xRegCnt );
+
+    OOO_DLLPUBLIC_CHARTTOOLS bool isMeanValueLine(
+        const css::uno::Reference<css::chart2::XRegressionCurve> & xRegCurve );
+    OOO_DLLPUBLIC_CHARTTOOLS bool isMeanValueLine(
+        const rtl::Reference<::chart::RegressionCurveModel> & xRegCurve );
+
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        getMeanValueLine(
+            const css::uno::Reference<css::chart2::XRegressionCurveContainer> & xRegCnt );
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        getMeanValueLine(
+            const rtl::Reference<::chart::DataSeries> & xRegCnt );
+
+    /** creates a mean-value line and adds it to the container.
+
+         @param xSeriesProp
+             If set, this property-set will be used to apply a line color
+     */
+    OOO_DLLPUBLIC_CHARTTOOLS void addMeanValueLine(
+        css::uno::Reference<css::chart2::XRegressionCurveContainer> const & xRegCnt,
+        const css::uno::Reference<css::beans::XPropertySet>& xSeriesProp );
+    OOO_DLLPUBLIC_CHARTTOOLS void addMeanValueLine(
+        rtl::Reference<::chart::DataSeries> const & xRegCnt,
+        const css::uno::Reference<css::beans::XPropertySet>& xSeriesProp );
+
+    OOO_DLLPUBLIC_CHARTTOOLS void removeMeanValueLine(
+        css::uno::Reference<css::chart2::XRegressionCurveContainer> const & xRegCnt );
+    OOO_DLLPUBLIC_CHARTTOOLS void removeMeanValueLine(
+        rtl::Reference<::chart::DataSeries> const & xRegCnt );
+
+    /** Returns the first regression curve found that is not of type
+        mean-value line
+     */
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        getFirstCurveNotMeanValueLine(
+            const css::uno::Reference<css::chart2::XRegressionCurveContainer>& xCurveContainer );
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        getFirstCurveNotMeanValueLine(
+            const rtl::Reference<::chart::DataSeries>& xCurveContainer );
+
+    /** Returns the regression curve found at the index provided.
+     */
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        getRegressionCurveAtIndex(
+            const rtl::Reference<::chart::DataSeries>& xCurveContainer,
+            sal_Int32 aIndex);
+
+    /** Returns the type of the first regression curve found that is not of type
+        mean-value line
+     */
+    OOO_DLLPUBLIC_CHARTTOOLS SvxChartRegress getFirstRegressTypeNotMeanValueLine(
+        const css::uno::Reference<css::chart2::XRegressionCurveContainer>& xCurveContainer );
+
+    OOO_DLLPUBLIC_CHARTTOOLS SvxChartRegress getRegressionType(
+        const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+    /** @param xPropertySource is taken as source to copy all properties from if
+               not null
+        @param xEquationProperties is set at the new regression curve as
+               equation properties if not null
+    */
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        addRegressionCurve(
+            SvxChartRegress eType,
+            css::uno::Reference<css::chart2::XRegressionCurveContainer> const & xCurveContainer,
+            const css::uno::Reference<css::beans::XPropertySet >& xPropertySource =
+                    css::uno::Reference<css::beans::XPropertySet>(),
+            const css::uno::Reference<css::beans::XPropertySet>& xEquationProperties =
+                    css::uno::Reference<css::beans::XPropertySet>() );
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        addRegressionCurve(
+            SvxChartRegress eType,
+            rtl::Reference<::chart::DataSeries> const & xCurveContainer,
+            const css::uno::Reference<css::beans::XPropertySet >& xPropertySource =
+                    css::uno::Reference<css::beans::XPropertySet>(),
+            const css::uno::Reference<css::beans::XPropertySet>& xEquationProperties =
+                    css::uno::Reference<css::beans::XPropertySet>() );
+
+    OOO_DLLPUBLIC_CHARTTOOLS bool removeAllExceptMeanValueLine(
+        rtl::Reference<::chart::DataSeries> const & xCurveContainer );
+
+    OOO_DLLPUBLIC_CHARTTOOLS void removeEquations(
+        rtl::Reference<::chart::DataSeries> const & xCurveContainer );
+
+    OOO_DLLPUBLIC_CHARTTOOLS rtl::Reference<::chart::RegressionCurveModel>
+        changeRegressionCurveType(
+            SvxChartRegress eType,
+            css::uno::Reference<css::chart2::XRegressionCurveContainer> const & xRegressionCurveContainer,
+            css::uno::Reference<css::chart2::XRegressionCurve> const & xRegressionCurve );
+
+    /// returns a calculator object for regression curves (used by the view)
+    OOO_DLLPUBLIC_CHARTTOOLS css::uno::Reference<css::chart2::XRegressionCurveCalculator>
+        createRegressionCurveCalculatorByServiceName( std::u16string_view aServiceName );
+
+    /** recalculates the regression parameters according to the data given in
+        the data source.
+
+        A sequence having the role "values-x" will be used as x-values for the
+        calculation if found.  Otherwise a sequence (1, 2, 3, ...) of category
+        indexes will be used for the recalculateRegression() method of the
+        regression curve.
+
+        The first sequence having the role "values-y" will be used as y-values
+        for the recalculateRegression() method of the regression curve.
+
+        @param bUseXValuesIfAvailable
+            If false, the sequence (1, 2, 3, ...) will always be used, even if
+            there is a data-sequence with role "values-x"
+     */
+    void initializeCurveCalculator(
+        const css::uno::Reference<css::chart2::XRegressionCurveCalculator>& xOutCurveCalculator,
+        const css::uno::Reference<css::chart2::data::XDataSource>& xSource,
+        bool bUseXValuesIfAvailable );
+
+    /** Same method as above, but uses the given XModel to determine the
+        parameter bUseXValuesIfAvailable in the above function.  It is also
+        necessary that the data::XDataSource is an XDataSeries, thus this parameter
+        also changed.
+     */
+    OOO_DLLPUBLIC_CHARTTOOLS void initializeCurveCalculator(
+        const css::uno::Reference<css::chart2::XRegressionCurveCalculator>& xOutCurveCalculator,
+        const css::uno::Reference<css::chart2::XDataSeries>& xSeries,
+        const rtl::Reference<::chart::ChartModel>& xModel );
+
+    OOO_DLLPUBLIC_CHARTTOOLS OUString getUINameForRegressionCurve(
+        const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+    OOO_DLLPUBLIC_CHARTTOOLS OUString getRegressionCurveName(
+        const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+    OOO_DLLPUBLIC_CHARTTOOLS OUString getRegressionCurveGenericName(
+        const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+    OOO_DLLPUBLIC_CHARTTOOLS OUString getRegressionCurveSpecificName(
+        const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+    OOO_DLLPUBLIC_CHARTTOOLS std::vector<rtl::Reference<::chart::RegressionCurveModel> >
+        getAllRegressionCurvesNotMeanValueLine(
+                const rtl::Reference<::chart::Diagram>& xDiagram );
+
+    OOO_DLLPUBLIC_CHARTTOOLS void resetEquationPosition(
+        const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+    /// @return the index of the given curve in the given container. -1 if not contained
+    OOO_DLLPUBLIC_CHARTTOOLS sal_Int32 getRegressionCurveIndex(
+        const rtl::Reference<::chart::DataSeries>& xContainer,
+        const rtl::Reference<::chart::RegressionCurveModel>& xCurve );
+
+    OOO_DLLPUBLIC_CHARTTOOLS bool hasEquation(const css::uno::Reference<css::chart2::XRegressionCurve>& xCurve );
+
+} //  namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */