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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 __com_sun_star_geometry_Matrix2D_idl__
+#define __com_sun_star_geometry_Matrix2D_idl__
+
+module com {  module sun {  module star {  module geometry {
+
+/** This structure defines a 2 by 2 matrix.<p>
+
+    This constitutes a linear mapping of a point in 2D to another
+    point in 2D.<p>
+
+    The matrix defined by this structure constitutes a linear
+    mapping of a point in 2D to another point in 2D. In contrast to
+    the com.sun.star.geometry.AffineMatrix2D, this
+    matrix does not include any translational components.<p>
+
+    A linear mapping, as performed by this matrix, can be written out
+    as follows, where <code>xs</code> and <code>ys</code> are the source, and
+    <code>xd</code> and <code>yd</code> the corresponding result coordinates:
+
+    <code>
+        xd = m00*xs + m01*ys;
+        yd = m10*xs + m11*ys;
+    </code><p>
+
+    Thus, in common matrix language, with M being the
+    Matrix2D and vs=[xs,ys]^T, vd=[xd,yd]^T two 2D
+    vectors, the linear mapping is written as
+    vd=M*vs. Concatenation of transformations amounts to
+    multiplication of matrices, i.e. a scaling, given by S,
+    followed by a rotation, given by R, is expressed as vd=R*(S*vs) in
+    the above notation. Since matrix multiplication is associative,
+    this can be shortened to vd=(R*S)*vs=M'*vs. Therefore, a set of
+    consecutive transformations can be accumulated into a single
+    Matrix2D, by multiplying the current transformation with the
+    additional transformation from the left.<p>
+
+    Due to this transformational approach, all geometry data types are
+    points in abstract integer or real coordinate spaces, without any
+    physical dimensions attached to them. This physical measurement
+    units are typically only added when using these data types to
+    render something onto a physical output device, like a screen or a
+    printer. Then, the total transformation matrix and the device
+    resolution determine the actual measurement unit.<p>
+
+    @since OOo 2.0
+ */
+struct Matrix2D
+{
+    /// The top, left matrix entry.
+    double m00;
+
+    /// The top, right matrix entry.
+    double m01;
+
+    /// The bottom, left matrix entry.
+    double m10;
+
+    /// The bottom, right matrix entry.
+    double m11;
+};
+
+}; }; }; };
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */