slideshow/source/engine/transitions/randomwipe.cxx

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  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_slideshow.hxx"
  33
  34 #include <canvas/debug.hxx>
  35 #include <basegfx/matrix/b2dhommatrix.hxx>
  36 #include <basegfx/numeric/ftools.hxx>
  37 #include "randomwipe.hxx"
  38 #include "tools.hxx"
  39
  40
  41 namespace slideshow {
  42 namespace internal {
  43
  44 RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars )
  45     : m_positions( new ::basegfx::B2DPoint[ nElements ] ),
  46       m_nElements( nElements ),
  47       m_rect( createUnitRect() )
  48 {
  49     ::basegfx::B2DHomMatrix aTransform;
  50     if (randomBars)
  51     {
  52         double edge = (1.0 / nElements);
  53         for ( sal_Int32 pos = nElements; pos--; )
  54             m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) );
  55         aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) );
  56     }
  57     else // dissolve effect
  58     {
  59         sal_Int32 sqrtElements = static_cast<sal_Int32>(
  60             sqrt( static_cast<double>(nElements) ) );
  61         double edge = (1.0 / sqrtElements);
  62         for ( sal_Int32 pos = nElements; pos--; ) {
  63             m_positions[ pos ] = ::basegfx::B2DPoint(
  64                 ::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ),
  65                 ::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) );
  66         }
  67         const double pedge = ::basegfx::pruneScaleValue(edge);
  68         aTransform.scale( pedge, pedge );
  69     }
  70     m_rect.transform( aTransform );
  71
  72     // mix up:
  73     for ( sal_Int32 i = (nElements / 2); i--; )
  74     {
  75         const sal_Int32 pos1 = getRandomOrdinal(nElements);
  76         const sal_Int32 pos2 = getRandomOrdinal(nElements);
  77         const ::basegfx::B2DPoint point( m_positions[ pos1 ] );
  78         m_positions[ pos1 ] = m_positions[ pos2 ];
  79         m_positions[ pos2 ] = point;
  80     }
  81 }
  82
  83 ::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t )
  84 {
  85     ::basegfx::B2DPolyPolygon res;
  86     for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; )
  87     {
  88         ::basegfx::B2DHomMatrix aTransform;
  89         ::basegfx::B2DPoint const & point = m_positions[ pos ];
  90         aTransform.translate( point.getX(), point.getY() );
  91         ::basegfx::B2DPolygon poly( m_rect );
  92         poly.transform( aTransform );
  93         res.append( poly );
  94     }
  95     return res;
  96 }
  97
  98 }
  99 }