slideshow/source/engine/transitions/randomwipe.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.
   4  *
   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 <basegfx/numeric/ftools.hxx>
  23 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  24 #include "randomwipe.hxx"
  25 #include <tools.hxx>
  26
  27
  28 namespace slideshow {
  29 namespace internal {
  30
  31 RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars )
  32     : m_positions( new ::basegfx::B2DPoint[ nElements ] ),
  33       m_nElements( nElements ),
  34       m_rect( createUnitRect() )
  35 {
  36     ::basegfx::B2DHomMatrix aTransform;
  37     if (randomBars)
  38     {
  39         double edge = (1.0 / nElements);
  40         for ( sal_Int32 pos = nElements; pos--; )
  41             m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) );
  42         aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) );
  43     }
  44     else // dissolve effect
  45     {
  46         sal_Int32 sqrtElements = static_cast<sal_Int32>(
  47             sqrt( static_cast<double>(nElements) ) );
  48         double edge = (1.0 / sqrtElements);
  49         for ( sal_Int32 pos = nElements; pos--; ) {
  50             m_positions[ pos ] = ::basegfx::B2DPoint(
  51                 ::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ),
  52                 ::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) );
  53         }
  54         const double pedge = ::basegfx::pruneScaleValue(edge);
  55         aTransform.scale( pedge, pedge );
  56     }
  57     m_rect.transform( aTransform );
  58
  59     // mix up:
  60     for ( sal_Int32 pos1 = nElements ; pos1-- ; )
  61     {
  62         const sal_Int32 pos2 = getRandomOrdinal(pos1+1);
  63         ::std::swap(m_positions[ pos1], m_positions[ pos2 ]);
  64     }
  65 }
  66
  67 ::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t )
  68 {
  69     ::basegfx::B2DPolyPolygon res;
  70     for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; )
  71     {
  72         ::basegfx::B2DPoint const & point = m_positions[ pos ];
  73         ::basegfx::B2DPolygon poly( m_rect );
  74         poly.transform(basegfx::utils::createTranslateB2DHomMatrix(point.getX(), point.getY()));
  75         res.append( poly );
  76     }
  77     return res;
  78 }
  79
  80 }
  81 }
  82
  83 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */