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diff --git a/slideshow/source/engine/transitions/snakewipe.cxx b/slideshow/source/engine/transitions/snakewipe.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 <sal/config.h>
+
+#include <cmath>
+
+#include <o3tl/temporary.hxx>
+#include <osl/diagnose.h>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/point/b2dpoint.hxx>
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+#include "snakewipe.hxx"
+#include "transitiontools.hxx"
+
+
+namespace slideshow::internal {
+
+SnakeWipe::SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis )
+ : m_sqrtElements( static_cast<sal_Int32>(
+ sqrt( static_cast<double>(nElements) ) ) ),
+ m_elementEdge( 1.0 / m_sqrtElements ),
+ m_diagonal(diagonal),
+ m_flipOnYAxis(flipOnYAxis)
+{
+}
+
+::basegfx::B2DPolyPolygon SnakeWipe::calcSnake( double t ) const
+{
+ ::basegfx::B2DPolyPolygon res;
+ const double area = t * m_sqrtElements * m_sqrtElements;
+ const sal_Int32 line_ = static_cast<sal_Int32>(area) / m_sqrtElements;
+ const double line = ::basegfx::pruneScaleValue(
+ static_cast<double>(line_) / m_sqrtElements );
+ const double col = ::basegfx::pruneScaleValue(
+ (area - (line_ * m_sqrtElements)) / m_sqrtElements );
+
+ if (! ::basegfx::fTools::equalZero( line )) {
+ ::basegfx::B2DPolygon poly;
+ poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
+ poly.append( ::basegfx::B2DPoint( 0.0, line ) );
+ poly.append( ::basegfx::B2DPoint( 1.0, line ) );
+ poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
+ poly.setClosed(true);
+ res.append(poly);
+ }
+ if (! ::basegfx::fTools::equalZero( col ))
+ {
+ double offset = 0.0;
+ if ((line_ & 1) == 1) {
+ // odd line: => right to left
+ offset = (1.0 - col);
+ }
+ ::basegfx::B2DPolygon poly;
+ poly.append( ::basegfx::B2DPoint( offset, line ) );
+ poly.append( ::basegfx::B2DPoint( offset,
+ line + m_elementEdge ) );
+ poly.append( ::basegfx::B2DPoint( offset + col,
+ line + m_elementEdge ) );
+ poly.append( ::basegfx::B2DPoint( offset + col, line ) );
+ poly.setClosed(true);
+ res.append(poly);
+ }
+
+ return res;
+}
+
+::basegfx::B2DPolyPolygon SnakeWipe::calcHalfDiagonalSnake(
+ double t, bool in ) const
+{
+ ::basegfx::B2DPolyPolygon res;
+
+ if (in) {
+ const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
+ const double edge = ::basegfx::pruneScaleValue(
+ std::trunc(sqrtArea2) /
+ m_sqrtElements );
+
+ ::basegfx::B2DPolygon poly;
+ if (! ::basegfx::fTools::equalZero( edge )) {
+ poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
+ poly.append( ::basegfx::B2DPoint( 0.0, edge ) );
+ poly.append( ::basegfx::B2DPoint( edge, 0.0 ) );
+ poly.setClosed(true);
+ res.append(poly);
+ }
+ const double a = M_SQRT1_2 / m_sqrtElements;
+ const double d = std::modf(sqrtArea2, &o3tl::temporary(double()));
+ const double len = t * M_SQRT2 * d;
+ const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
+ poly.clear();
+ poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
+ poly.append( ::basegfx::B2DPoint( 0.0, height ) );
+ poly.append( ::basegfx::B2DPoint( len + a, height ) );
+ poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
+ poly.setClosed(true);
+ ::basegfx::B2DHomMatrix aTransform;
+
+ if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
+ {
+ // odd line
+ aTransform = basegfx::utils::createRotateB2DHomMatrix(M_PI_2 + M_PI_4);
+ aTransform.translate(edge + m_elementEdge, 0.0);
+ }
+ else
+ {
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(-a, 0.0);
+ aTransform.rotate( -M_PI_4 );
+ aTransform.translate( 0.0, edge );
+ }
+
+ poly.transform( aTransform );
+ res.append(poly);
+ }
+ else // out
+ {
+ const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
+ const double edge = ::basegfx::pruneScaleValue(
+ std::trunc(sqrtArea2) /
+ m_sqrtElements );
+
+ ::basegfx::B2DPolygon poly;
+ if (! ::basegfx::fTools::equalZero( edge )) {
+ poly.append( ::basegfx::B2DPoint( 0.0, 1.0 ) );
+ poly.append( ::basegfx::B2DPoint( edge, 1.0 ) );
+ poly.append( ::basegfx::B2DPoint( 1.0, edge ) );
+ poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
+ poly.setClosed(true);
+ res.append(poly);
+ }
+ const double a = M_SQRT1_2 / m_sqrtElements;
+ const double d = std::modf(sqrtArea2, &o3tl::temporary(double()));
+ const double len = (1.0 - t) * M_SQRT2 * d;
+ const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
+ poly.clear();
+ poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
+ poly.append( ::basegfx::B2DPoint( 0.0, height ) );
+ poly.append( ::basegfx::B2DPoint( len + a, height ) );
+ poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
+ poly.setClosed(true);
+ ::basegfx::B2DHomMatrix aTransform;
+
+ if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
+ {
+ // odd line
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(0.0, -height);
+ aTransform.rotate( M_PI_2 + M_PI_4 );
+ aTransform.translate( 1.0, edge );
+ }
+ else
+ {
+ aTransform = basegfx::utils::createRotateB2DHomMatrix(-M_PI_4);
+ aTransform.translate( edge, 1.0 );
+ }
+ poly.transform( aTransform );
+ res.append(poly);
+ }
+
+ return res;
+}
+
+::basegfx::B2DPolyPolygon SnakeWipe::operator () ( double t )
+{
+ ::basegfx::B2DPolyPolygon res;
+ if (m_diagonal)
+ {
+ if (t >= 0.5) {
+ res.append( calcHalfDiagonalSnake( 1.0, true ) );
+ res.append( calcHalfDiagonalSnake( 2.0 * (t - 0.5), false ) );
+ }
+ else
+ res.append( calcHalfDiagonalSnake( 2.0 * t, true ) );
+ }
+ else
+ res = calcSnake(t);
+
+ return m_flipOnYAxis ? flipOnYAxis(res) : res;
+}
+
+::basegfx::B2DPolyPolygon ParallelSnakesWipe::operator () ( double t )
+{
+ ::basegfx::B2DPolyPolygon res;
+ if (m_diagonal)
+ {
+ OSL_ASSERT( m_opposite );
+ ::basegfx::B2DPolyPolygon half(
+ calcHalfDiagonalSnake( t, false /* out */ ) );
+ // flip on x axis and rotate 90 degrees:
+ basegfx::B2DHomMatrix aTransform(basegfx::utils::createScaleB2DHomMatrix(1.0, -1.0));
+ aTransform.translate( -0.5, 0.5 );
+ aTransform.rotate( M_PI_2 );
+ aTransform.translate( 0.5, 0.5 );
+ half.transform( aTransform );
+ half.flip();
+ res.append( half );
+
+ // rotate 180 degrees:
+ aTransform = basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5);
+ aTransform.rotate( M_PI );
+ aTransform.translate( 0.5, 0.5 );
+ half.transform( aTransform );
+ res.append( half );
+ }
+ else
+ {
+ ::basegfx::B2DPolyPolygon half( calcSnake( t / 2.0 ) );
+ // rotate 90 degrees:
+ basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
+ aTransform.rotate( M_PI_2 );
+ aTransform.translate( 0.5, 0.5 );
+ half.transform( aTransform );
+ res.append( flipOnYAxis(half) );
+ res.append( m_opposite ? flipOnXAxis(half) : half );
+ }
+
+ return m_flipOnYAxis ? flipOnYAxis(res) : res;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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