slideshow/source/engine/transitions/checkerboardwipe.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include <basegfx/matrix/b2dhommatrix.hxx>
  22 #include "checkerboardwipe.hxx"
  23
  24
  25 namespace slideshow::internal {
  26
  27 ::basegfx::B2DPolyPolygon CheckerBoardWipe::operator () ( double t )
  28 {
  29     const double d = 1.0 / m_unitsPerEdge;
  30     ::basegfx::B2DHomMatrix aTransform;
  31     aTransform.scale( ::basegfx::pruneScaleValue( d * 2.0 * t ),
  32                       ::basegfx::pruneScaleValue( d ) );
  33
  34     ::basegfx::B2DPolyPolygon res;
  35     for ( sal_Int32 i = m_unitsPerEdge; i--; )
  36     {
  37         ::basegfx::B2DHomMatrix transform( aTransform );
  38         if ((i % 2) == 1) // odd line
  39             transform.translate( -d, 0.0 );
  40         for ( sal_Int32 j = (m_unitsPerEdge / 2) + 1; j--; )
  41         {
  42             ::basegfx::B2DPolyPolygon poly( m_unitRect );
  43             poly.transform( transform );
  44             res.append( poly );
  45             transform.translate( d * 2.0, 0.0 );
  46         }
  47         aTransform.translate( 0.0, d ); // next line
  48     }
  49     return res;
  50 }
  51
  52 }
  53
  54 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */