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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 "checkerboardwipe.hxx"
34 
35 
36 namespace slideshow {
37 namespace internal {
38 
39 ::basegfx::B2DPolyPolygon CheckerBoardWipe::operator () ( double t )
40 {
41     const double d = (1.0 / m_unitsPerEdge);
42     ::basegfx::B2DHomMatrix aTransform;
43     aTransform.scale( ::basegfx::pruneScaleValue( d * 2.0 * t ),
44                       ::basegfx::pruneScaleValue( d ) );
45 
46     ::basegfx::B2DPolyPolygon res;
47     for ( sal_Int32 i = m_unitsPerEdge; i--; )
48     {
49         ::basegfx::B2DHomMatrix transform( aTransform );
50         if ((i % 2) == 1) // odd line
51             transform.translate( -d, 0.0 );
52         for ( sal_Int32 j = (m_unitsPerEdge / 2) + 1; j--; )
53         {
54             ::basegfx::B2DPolyPolygon poly( m_unitRect );
55             poly.transform( transform );
56             res.append( poly );
57             transform.translate( d * 2.0, 0.0 );
58         }
59         aTransform.translate( 0.0, d ); // next line
60     }
61     return res;
62 }
63 
64 }
65 }
66