slideshow/source/engine/transitions/randomwipe.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
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  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 <canvas/debug.hxx>
  22 #include <basegfx/matrix/b2dhommatrix.hxx>
  23 #include <basegfx/numeric/ftools.hxx>
  24 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  25 #include "randomwipe.hxx"
  26 #include "tools.hxx"
  27
  28
  29 namespace slideshow {
  30 namespace internal {
  31
  32 RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars )
  33     : m_positions( new ::basegfx::B2DPoint[ nElements ] ),
  34       m_nElements( nElements ),
  35       m_rect( createUnitRect() )
  36 {
  37     ::basegfx::B2DHomMatrix aTransform;
  38     if (randomBars)
  39     {
  40         double edge = (1.0 / nElements);
  41         for ( sal_Int32 pos = nElements; pos--; )
  42             m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) );
  43         aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) );
  44     }
  45     else // dissolve effect
  46     {
  47         sal_Int32 sqrtElements = static_cast<sal_Int32>(
  48             sqrt( static_cast<double>(nElements) ) );
  49         double edge = (1.0 / sqrtElements);
  50         for ( sal_Int32 pos = nElements; pos--; ) {
  51             m_positions[ pos ] = ::basegfx::B2DPoint(
  52                 ::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ),
  53                 ::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) );
  54         }
  55         const double pedge = ::basegfx::pruneScaleValue(edge);
  56         aTransform.scale( pedge, pedge );
  57     }
  58     m_rect.transform( aTransform );
  59
  60     // mix up:
  61     for ( sal_Int32 pos1 = nElements ; pos1-- ; )
  62     {
  63         const sal_Int32 pos2 = getRandomOrdinal(pos1+1);
  64         ::std::swap(m_positions[ pos1], m_positions[ pos2 ]);
  65     }
  66 }
  67
  68 ::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t )
  69 {
  70     ::basegfx::B2DPolyPolygon res;
  71     for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; )
  72     {
  73         ::basegfx::B2DPoint const & point = m_positions[ pos ];
  74         ::basegfx::B2DPolygon poly( m_rect );
  75         poly.transform(basegfx::tools::createTranslateB2DHomMatrix(point.getX(), point.getY()));
  76         res.append( poly );
  77     }
  78     return res;
  79 }
  80
  81 }
  82 }
  83
  84 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */