slideshow/source/engine/transitions/doublediamondwipe.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 "doublediamondwipe.hxx"
  38
  39
  40 namespace slideshow {
  41 namespace internal {
  42
  43 ::basegfx::B2DPolyPolygon DoubleDiamondWipe::operator () ( double t )
  44 {
  45     // outer:
  46     const double a = ::basegfx::pruneScaleValue( 0.25 + (t * 0.75) );
  47     ::basegfx::B2DPolygon poly;
  48     poly.append( ::basegfx::B2DPoint( 0.5 + a, 0.5 ) );
  49     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - a ) );
  50     poly.append( ::basegfx::B2DPoint( 0.5 - a, 0.5 ) );
  51     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + a ) );
  52     poly.setClosed(true);
  53     ::basegfx::B2DPolyPolygon res(poly);
  54
  55     // inner (reverse order to clip):
  56     const double b = ::basegfx::pruneScaleValue( (1.0 - t) * 0.25 );
  57     poly.clear();
  58     poly.append( ::basegfx::B2DPoint( 0.5 + b, 0.5 ) );
  59     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + b ) );
  60     poly.append( ::basegfx::B2DPoint( 0.5 - b, 0.5 ) );
  61     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - b ) );
  62     poly.setClosed(true);
  63     res.append(poly);
  64
  65     return res;
  66 }
  67
  68 }
  69 }