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diff --git a/slideshow/source/engine/transitions/sweepwipe.cxx b/slideshow/source/engine/transitions/sweepwipe.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/matrix/b2dhommatrixtools.hxx>
+#include "clockwipe.hxx"
+#include "sweepwipe.hxx"
+#include "transitiontools.hxx"
+
+
+namespace slideshow::internal {
+
+::basegfx::B2DPolyPolygon SweepWipe::operator () ( double t )
+{
+ t /= 2.0;
+ if (! m_center)
+ t /= 2.0;
+ if (!m_single && !m_oppositeVertical)
+ t /= 2.0;
+
+ ::basegfx::B2DPolygon poly( ClockWipe::calcCenteredClock( 0.25 + t ) );
+ ::basegfx::B2DHomMatrix aTransform;
+
+ if (m_center)
+ {
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(0.5, 0.0);
+ poly.transform( aTransform );
+ }
+ ::basegfx::B2DPolyPolygon res(poly);
+
+ if (! m_single)
+ {
+ if (m_oppositeVertical)
+ {
+ aTransform = basegfx::utils::createScaleB2DHomMatrix(1.0, -1.0);
+ aTransform.translate( 0.0, 1.0 );
+ poly.transform( aTransform );
+ poly.flip();
+ }
+ else
+ {
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5);
+ aTransform.rotate( M_PI );
+ aTransform.translate( 0.5, 0.5 );
+ poly.transform( aTransform );
+ }
+ res.append(poly);
+ }
+
+ return m_flipOnYAxis ? flipOnYAxis(res) : res;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */