1 files changed, 54 insertions, 0 deletions
diff --git a/slideshow/source/engine/transitions/checkerboardwipe.cxx b/slideshow/source/engine/transitions/checkerboardwipe.cxx
new file mode 100644
index 000000000..a88224a33
--- /dev/null
+++ b/slideshow/source/engine/transitions/checkerboardwipe.cxx
@@ -0,0 +1,54 @@
+/* -*- 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 "checkerboardwipe.hxx"
+
+
+namespace slideshow::internal {
+
+::basegfx::B2DPolyPolygon CheckerBoardWipe::operator () ( double t )
+{
+    const double d = 1.0 / m_unitsPerEdge;
+    ::basegfx::B2DHomMatrix aTransform;
+    aTransform.scale( ::basegfx::pruneScaleValue( d * 2.0 * t ),
+                      ::basegfx::pruneScaleValue( d ) );
+
+    ::basegfx::B2DPolyPolygon res;
+    for ( sal_Int32 i = m_unitsPerEdge; i--; )
+    {
+        ::basegfx::B2DHomMatrix transform( aTransform );
+        if ((i % 2) == 1) // odd line
+            transform.translate( -d, 0.0 );
+        for ( sal_Int32 j = (m_unitsPerEdge / 2) + 1; j--; )
+        {
+            ::basegfx::B2DPolyPolygon poly( m_unitRect );
+            poly.transform( transform );
+            res.append( poly );
+            transform.translate( d * 2.0, 0.0 );
+        }
+        aTransform.translate( 0.0, d ); // next line
+    }
+    return res;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */