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diff --git a/chart2/source/inc/ThreeDHelper.hxx b/chart2/source/inc/ThreeDHelper.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 <com/sun/star/drawing/CameraGeometry.hpp>
+#include <rtl/ref.hxx>
+#include "charttoolsdllapi.hxx"
+
+namespace com::sun::star::beans { class XPropertySet; }
+namespace com::sun::star::chart2 { class XDiagram; }
+
+namespace chart
+{
+class Diagram;
+
+enum class ThreeDLookScheme
+{
+    ThreeDLookScheme_Simple,
+    ThreeDLookScheme_Realistic,
+    ThreeDLookScheme_Unknown
+};
+
+enum CuboidPlanePosition
+{
+    CuboidPlanePosition_Left,
+    CuboidPlanePosition_Right,
+    CuboidPlanePosition_Top,
+    CuboidPlanePosition_Bottom,
+    CuboidPlanePosition_Front,
+    CuboidPlanePosition_Back
+};
+
+class OOO_DLLPUBLIC_CHARTTOOLS ThreeDHelper
+{
+public:
+
+    /** Returns the default camera geometry that is set in the Diagram CTOR.
+        This is not the property default!
+
+        @todo deprecate the hard set camera geometry and use the property
+              default
+     */
+    static css::drawing::CameraGeometry getDefaultCameraGeometry( bool bPie=false );
+
+    static void adaptRadAnglesForRightAngledAxes( double& rfXAngleRad, double& rfYAngleRad );
+    static double getXDegreeAngleLimitForRightAngledAxes() { return 90.0; }
+    static double getYDegreeAngleLimitForRightAngledAxes() { return 45.0; }
+
+    static double getValueClippedToRange( double fValue, const double& fPositivLimit );
+
+    static void convertElevationRotationDegToXYZAngleRad(
+        sal_Int32 nElevationDeg, sal_Int32 nRotationDeg
+        , double& rfXAngleRad, double& rfYAngleRad, double& rfZAngleRad );
+
+    SAL_DLLPRIVATE static void convertXYZAngleRadToElevationRotationDeg(
+        sal_Int32& rnElevationDeg, sal_Int32& rnRotationDeg
+        , double fXRad, double fYRad, double fZRad );
+
+    SAL_DLLPRIVATE static void ensureCameraDistanceRange( double& rfCameraDistance );
+    SAL_DLLPRIVATE static void getCameraDistanceRange( double& rfMinimumDistance, double& rfMaximumDistance );
+
+    static double CameraDistanceToPerspective( double fCameraDistance );
+    static double PerspectiveToCameraDistance( double fPerspective );
+
+    static CuboidPlanePosition getAutomaticCuboidPlanePositionForStandardLeftWall( const rtl::Reference<
+            ::chart::Diagram >& xDiagram );
+    static CuboidPlanePosition getAutomaticCuboidPlanePositionForStandardBackWall(const rtl::Reference<
+            ::chart::Diagram >& xDiagram );
+    static CuboidPlanePosition getAutomaticCuboidPlanePositionForStandardBottom(const rtl::Reference<
+            ::chart::Diagram >& xDiagram );
+
+    //sal_Int32 nRoundedEdges:  <0 or >100 -> mixed state
+    //sal_Int32 nObjectLines:  0->no lines; 1->all lines on; other->mixed state
+
+    static void getRoundedEdgesAndObjectLines( const rtl::Reference< ::chart::Diagram >& xDiagram
+            , sal_Int32& rnRoundedEdges, sal_Int32& rnObjectLines );
+    static void setRoundedEdgesAndObjectLines( const rtl::Reference< ::chart::Diagram >& xDiagram
+            , sal_Int32 nRoundedEdges, sal_Int32 nObjectLines );
+};
+
+} //namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */