slideshow/source/engine/transitions/waterfallwipe.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/point/b2dpoint.hxx>
  37 #include <basegfx/numeric/ftools.hxx>
  38 #include "waterfallwipe.hxx"
  39 #include "transitiontools.hxx"
  40
  41
  42 namespace slideshow {
  43 namespace internal {
  44
  45 WaterfallWipe::WaterfallWipe( sal_Int32 nElements, bool flipOnYAxis )
  46     : m_flipOnYAxis( flipOnYAxis )
  47 {
  48     const sal_Int32 sqrtElements = static_cast<sal_Int32>(
  49         sqrt( static_cast<double>(nElements) ) );
  50     const double elementEdge = (1.0 / sqrtElements);
  51     m_waterfall.append( ::basegfx::B2DPoint( 0.0, -1.0 ) );
  52     for ( sal_Int32 pos = sqrtElements; pos--; )
  53     {
  54         const sal_Int32 xPos = (sqrtElements - pos - 1);
  55         const double yPos = ::basegfx::pruneScaleValue( ((pos + 1) * elementEdge) - 1.0 );
  56         m_waterfall.append( ::basegfx::B2DPoint(
  57                                 ::basegfx::pruneScaleValue( xPos * elementEdge ),
  58                                 yPos ) );
  59         m_waterfall.append( ::basegfx::B2DPoint(
  60                                 ::basegfx::pruneScaleValue( (xPos + 1) * elementEdge ),
  61                                 yPos ) );
  62     }
  63     m_waterfall.append( ::basegfx::B2DPoint( 1.0, -1.0 ) );
  64     m_waterfall.setClosed(true);
  65 }
  66
  67 ::basegfx::B2DPolyPolygon WaterfallWipe::operator () ( double t )
  68 {
  69     ::basegfx::B2DPolygon poly( m_waterfall );
  70     ::basegfx::B2DHomMatrix aTransform;
  71     aTransform.translate( 0.0, ::basegfx::pruneScaleValue( 2.0 * t ) );
  72     poly.transform( aTransform );
  73     poly.setB2DPoint( 0, ::basegfx::B2DPoint( 0.0, -1.0 ) );
  74     poly.setB2DPoint( poly.count()-1, ::basegfx::B2DPoint( 1.0, -1.0 ) );
  75
  76     return m_flipOnYAxis ? flipOnYAxis( ::basegfx::B2DPolyPolygon(poly) )
  77                          : ::basegfx::B2DPolyPolygon(poly);
  78 }
  79
  80 }
  81 }