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27 
28 // MARKER(update_precomp.py): autogen include statement, do not remove
29 #include "precompiled_slideshow.hxx"
30 
31 #include <canvas/debug.hxx>
32 #include <basegfx/matrix/b2dhommatrix.hxx>
33 #include <basegfx/point/b2dpoint.hxx>
34 #include <basegfx/numeric/ftools.hxx>
35 #include <basegfx/matrix/b2dhommatrixtools.hxx>
36 #include "waterfallwipe.hxx"
37 #include "transitiontools.hxx"
38 
39 
40 namespace slideshow {
41 namespace internal {
42 
43 WaterfallWipe::WaterfallWipe( sal_Int32 nElements, bool flipOnYAxis )
44     : m_flipOnYAxis( flipOnYAxis )
45 {
46     const sal_Int32 sqrtElements = static_cast<sal_Int32>(
47         sqrt( static_cast<double>(nElements) ) );
48     const double elementEdge = (1.0 / sqrtElements);
49     m_waterfall.append( ::basegfx::B2DPoint( 0.0, -1.0 ) );
50     for ( sal_Int32 pos = sqrtElements; pos--; )
51     {
52         const sal_Int32 xPos = (sqrtElements - pos - 1);
53         const double yPos = ::basegfx::pruneScaleValue( ((pos + 1) * elementEdge) - 1.0 );
54         m_waterfall.append( ::basegfx::B2DPoint(
55                                 ::basegfx::pruneScaleValue( xPos * elementEdge ),
56                                 yPos ) );
57         m_waterfall.append( ::basegfx::B2DPoint(
58                                 ::basegfx::pruneScaleValue( (xPos + 1) * elementEdge ),
59                                 yPos ) );
60     }
61     m_waterfall.append( ::basegfx::B2DPoint( 1.0, -1.0 ) );
62     m_waterfall.setClosed(true);
63 }
64 
65 ::basegfx::B2DPolyPolygon WaterfallWipe::operator () ( double t )
66 {
67     ::basegfx::B2DPolygon poly( m_waterfall );
68     poly.transform(basegfx::tools::createTranslateB2DHomMatrix(0.0, ::basegfx::pruneScaleValue(2.0 * t)));
69     poly.setB2DPoint( 0, ::basegfx::B2DPoint( 0.0, -1.0 ) );
70     poly.setB2DPoint( poly.count()-1, ::basegfx::B2DPoint( 1.0, -1.0 ) );
71 
72     return m_flipOnYAxis ? flipOnYAxis( ::basegfx::B2DPolyPolygon(poly) )
73                          : ::basegfx::B2DPolyPolygon(poly);
74 }
75 
76 }
77 }
78