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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/numeric/ftools.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+#include "randomwipe.hxx"
+#include "transitiontools.hxx"
+#include <tools.hxx>
+
+
+namespace slideshow::internal {
+
+RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars )
+ : m_positions( new ::basegfx::B2DPoint[ nElements ] ),
+ m_nElements( nElements ),
+ m_rect( createUnitRect() )
+{
+ ::basegfx::B2DHomMatrix aTransform;
+ if (randomBars)
+ {
+ double edge = 1.0 / nElements;
+ for ( sal_Int32 pos = nElements; pos--; )
+ m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) );
+ aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) );
+ }
+ else // dissolve effect
+ {
+ sal_Int32 sqrtElements = static_cast<sal_Int32>(
+ sqrt( static_cast<double>(nElements) ) );
+ double edge = 1.0 / sqrtElements;
+ for ( sal_Int32 pos = nElements; pos--; ) {
+ m_positions[ pos ] = ::basegfx::B2DPoint(
+ ::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ),
+ ::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) );
+ }
+ const double pedge = ::basegfx::pruneScaleValue(edge);
+ aTransform.scale( pedge, pedge );
+ }
+ m_rect.transform( aTransform );
+
+ // mix up:
+ for ( sal_Int32 pos1 = nElements ; pos1-- ; )
+ {
+ const sal_Int32 pos2 = getRandomOrdinal(pos1+1);
+ ::std::swap(m_positions[ pos1], m_positions[ pos2 ]);
+ }
+}
+
+::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t )
+{
+ ::basegfx::B2DPolyPolygon res;
+ for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; )
+ {
+ ::basegfx::B2DPoint const & point = m_positions[ pos ];
+ ::basegfx::B2DPolygon poly( m_rect );
+ poly.transform(basegfx::utils::createTranslateB2DHomMatrix(point.getX(), point.getY()));
+ res.append( poly );
+ }
+ return res;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */