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21 
22 
23 
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_slideshow.hxx"
26 
27 #include <canvas/debug.hxx>
28 #include <basegfx/matrix/b2dhommatrix.hxx>
29 #include "checkerboardwipe.hxx"
30 
31 
32 namespace slideshow {
33 namespace internal {
34 
operator ()(double t)35 ::basegfx::B2DPolyPolygon CheckerBoardWipe::operator () ( double t )
36 {
37     const double d = (1.0 / m_unitsPerEdge);
38     ::basegfx::B2DHomMatrix aTransform;
39     aTransform.scale( ::basegfx::pruneScaleValue( d * 2.0 * t ),
40                       ::basegfx::pruneScaleValue( d ) );
41 
42     ::basegfx::B2DPolyPolygon res;
43     for ( sal_Int32 i = m_unitsPerEdge; i--; )
44     {
45         ::basegfx::B2DHomMatrix transform( aTransform );
46         if ((i % 2) == 1) // odd line
47             transform.translate( -d, 0.0 );
48         for ( sal_Int32 j = (m_unitsPerEdge / 2) + 1; j--; )
49         {
50             ::basegfx::B2DPolyPolygon poly( m_unitRect );
51             poly.transform( transform );
52             res.append( poly );
53             transform.translate( d * 2.0, 0.0 );
54         }
55         aTransform.translate( 0.0, d ); // next line
56     }
57     return res;
58 }
59 
60 }
61 }
62