chart2/source/view/inc/Clipping.hxx

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  19
  20 #ifndef INCLUDED_CHART2_SOURCE_VIEW_INC_CLIPPING_HXX
  21 #define INCLUDED_CHART2_SOURCE_VIEW_INC_CLIPPING_HXX
  22
  23 #include <basegfx/range/b2drectangle.hxx>
  24 #include <com/sun/star/drawing/PolyPolygonShape3D.hpp>
  25
  26 namespace chart
  27 {
  28
  29 /**
  30 */
  31
  32 class Clipping
  33 {
  34     /** This class uses the Liang-Biarsky parametric line-clipping algorithm as described in:
  35             Computer Graphics: principles and practice, 2nd ed.,
  36             James D. Foley et al.,
  37             Section 3.12.4 on page 117.
  38     */
  39
  40 public:
  41     /** @descr  The intersection between an open polygon and a rectangle is
  42             calculated and the resulting lines are placed into the poly-polygon aResult.
  43         @param  rPolygon    The polygon is required to be open, ie. its start and end point
  44             have different coordinates and that it is continuous, ie. has no holes.
  45         @param  rRectangle  The clipping area.
  46         @param  aResult The resulting lines that are the parts of the given polygon lying inside
  47             the clipping area are stored into aResult whose prior content is deleted first.
  48      */
  49     static void clipPolygonAtRectangle(
  50                                 const ::com::sun::star::drawing::PolyPolygonShape3D& rPolygon
  51                                 , const ::basegfx::B2DRectangle& rRectangle
  52                                 , ::com::sun::star::drawing::PolyPolygonShape3D& aResult
  53                                 , bool bSplitPiecesToDifferentPolygons = true );
  54 };
  55
  56 } //namespace chart
  57 #endif
  58
  59 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */