xref: /aoo41x/main/chart2/source/view/inc/Clipping.hxx (revision cdf0e10c)
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27  
28  #ifndef _CHART2_CLIPPING_HXX
29  #define _CHART2_CLIPPING_HXX
30  
31  #include <basegfx/range/b2drectangle.hxx>
32  #include <com/sun/star/drawing/PolyPolygonShape3D.hpp>
33  
34  //.............................................................................
35  namespace chart
36  {
37  //.............................................................................
38  
39  //-----------------------------------------------------------------------------
40  /**
41  */
42  
43  class Clipping
44  {
45      /** This class uses the Liang-Biarsky parametric line-clipping algorithm as described in:
46  			Computer Graphics: principles and practice, 2nd ed.,
47  			James D. Foley et al.,
48  			Section 3.12.4 on page 117.
49      */
50  
51  public:
52      /**	@descr	The intersection between an open polygon and a rectangle is
53  			calculated and the resulting lines are placed into the poly-polygon aResult.
54  		@param	rPolygon	The polygon is required to be open, ie. it's start and end point
55  			have different coordinates and that it is continuous, ie. has no holes.
56  		@param	rRectangle	The clipping area.
57  		@param	aResult	The resulting lines that are the parts of the given polygon lying inside
58  			the clipping area are stored into aResult whose prior content is deleted first.
59  	 */
60      static void clipPolygonAtRectangle(
61                                  const ::com::sun::star::drawing::PolyPolygonShape3D& rPolygon
62                                  , const ::basegfx::B2DRectangle& rRectangle
63                                  , ::com::sun::star::drawing::PolyPolygonShape3D& aResult
64                                  , bool bSplitPiecesToDifferentPolygons = true );
65  };
66  
67  //.............................................................................
68  } //namespace chart
69  //.............................................................................
70  #endif
71