include/basegfx/polygon/b2dpolypolygonfillrule.hxx

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  19
  20 #ifndef _BGFX_POLYGON_B2DPOLYPOLYGONFILLRULE_HXX
  21 #define _BGFX_POLYGON_B2DPOLYPOLYGONFILLRULE_HXX
  22
  23 #include <sal/types.h>
  24
  25 //////////////////////////////////////////////////////////////////////////////
  26
  27 namespace basegfx
  28 {
  29     /** Fill rule to use for poly-polygon filling.
  30
  31         The fill rule determines which areas are inside, and which are
  32         outside the poly-polygon.
  33      */
  34     enum FillRule
  35     {
  36         /** Areas, for which a scanline has crossed an odd number of
  37             vertices, are regarded 'inside', the remainder 'outside'
  38             of the poly-polygon.
  39          */
  40         FillRule_EVEN_ODD,
  41
  42         /** For each edge a scanline crosses, a current winding number
  43             is updated. Downward edges count +1, upward edges count
  44             -1. If the total accumulated winding number for one area
  45             is not zero, this area is regarded 'inside', otherwise,
  46             'outside'.
  47          */
  48         FillRule_NONZERO_WINDING_NUMBER
  49     };
  50 }
  51
  52 #endif /* _BGFX_POLYGON_B2DPOLYPOLYGONFILLRULE_HXX */
  53
  54 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */