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diff --git a/slideshow/source/engine/transitions/fourboxwipe.cxx b/slideshow/source/engine/transitions/fourboxwipe.cxx
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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 .
+ */
+
+
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+#include <basegfx/numeric/ftools.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+#include "fourboxwipe.hxx"
+
+
+namespace slideshow::internal {
+
+::basegfx::B2DPolyPolygon FourBoxWipe::operator () ( double t )
+{
+ ::basegfx::B2DHomMatrix aTransform;
+ const double d = ::basegfx::pruneScaleValue( t / 2.0 );
+ if (m_cornersOut)
+ {
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5);
+ aTransform = basegfx::utils::createScaleTranslateB2DHomMatrix(d, d, -0.25, -0.25)
+ * aTransform;
+ }
+ else
+ {
+ aTransform = basegfx::utils::createScaleTranslateB2DHomMatrix(d, d, -0.5, -0.5);
+ }
+
+ // top left:
+ ::basegfx::B2DPolygon square( m_unitRect );
+ square.transform( aTransform );
+ ::basegfx::B2DPolyPolygon res( square );
+ // bottom left, flip on x-axis:
+ aTransform.scale( -1.0, 1.0 );
+ ::basegfx::B2DPolygon square2( m_unitRect );
+ square2.transform( aTransform );
+ square2.flip(); // flip direction
+ res.append( square2 );
+ // bottom right, flip on y-axis:
+ aTransform.scale( 1.0, -1.0 );
+ ::basegfx::B2DPolygon square3( m_unitRect );
+ square3.transform( aTransform );
+ res.append( square3 );
+ // top right, flip on x-axis:
+ aTransform.scale( -1.0, 1.0 );
+ ::basegfx::B2DPolygon square4( m_unitRect );
+ square4.transform( aTransform );
+ square4.flip(); // flip direction
+ res.append( square4 );
+
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(0.5, 0.5);
+ res.transform( aTransform );
+ return res;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */