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diff --git a/include/svx/viewpt3d.hxx b/include/svx/viewpt3d.hxx
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+++ b/include/svx/viewpt3d.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 .
+ */
+
+#ifndef INCLUDED_SVX_VIEWPT3D_HXX
+#define INCLUDED_SVX_VIEWPT3D_HXX
+
+#include <svx/svxdllapi.h>
+#include <basegfx/matrix/b3dhommatrix.hxx>
+#include <basegfx/point/b3dpoint.hxx>
+#include <basegfx/vector/b3dvector.hxx>
+#include <tools/gen.hxx>
+
+// predefines
+namespace basegfx { class B3DRange; } // end of namespace basegfx
+
+/*************************************************************************
+|*
+|* enums for projection
+|*
+\************************************************************************/
+
+enum class ProjectionType { Parallel, Perspective };
+
+
+/*************************************************************************
+|*
+|* 3D viewport according to PHIGS
+|*
+\************************************************************************/
+
+class SVXCORE_DLLPUBLIC Viewport3D
+{
+ protected:
+    basegfx::B3DHomMatrix       aViewTf;        // the real transformations matrix
+    basegfx::B3DPoint           aVRP;           // View Reference Point
+    basegfx::B3DVector          aVPN;           // View Plane Normal
+    basegfx::B3DVector          aVUV;           // View Up Vector
+    basegfx::B3DPoint           aPRP;           // Projection Reference Point(View-coordinates)
+                                                // up to now only the z-coordinate is considered
+
+    ProjectionType  eProjection;    // kind of the projection
+    tools::Rectangle aDeviceRect;          // position and size of the output area
+
+    struct
+    {
+        double X, Y, W, H;          // position and size of the view window
+    } aViewWin;                     // in view coordinates
+
+    basegfx::B3DPoint       aViewPoint;     //observers position in world coordinates;
+                                    // is calculated by the transformation
+    bool            bTfValid;       // flag, if transformation is valid
+
+ public:
+    Viewport3D();
+
+    void SetVRP(const basegfx::B3DPoint& rNewVRP);
+    void SetVPN(const basegfx::B3DVector& rNewVPN);
+    void SetVUV(const basegfx::B3DVector& rNewVUV);
+    void SetPRP(const basegfx::B3DPoint& rNewPRP);
+
+    const basegfx::B3DPoint&    GetVRP() const  { return aVRP; }
+    const basegfx::B3DVector&   GetVUV() const  { return aVUV; }
+
+    void SetProjection(ProjectionType ePrj)
+        { eProjection = ePrj; bTfValid = false; }
+    ProjectionType GetProjection() const { return eProjection; }
+
+    void SetViewWindow(double fX, double fY, double fW, double fH);
+
+    void SetDeviceWindow(const tools::Rectangle& rRect);
+    const tools::Rectangle& GetDeviceWindow() const { return aDeviceRect; }
+
+    // returns observers position in world coordinates
+    const basegfx::B3DPoint&    GetViewPoint();
+};
+
+#endif // INCLUDED_SVX_VIEWPT3D_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */