chart2/source/view/inc/Clipping.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
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  18  */
  19
  20 #pragma once
  21
  22 #include <basegfx/range/b2drectangle.hxx>
  23
  24 namespace com::sun::star::drawing { struct PolyPolygonShape3D; }
  25 namespace com::sun::star::drawing { struct Position3D; }
  26
  27 namespace chart
  28 {
  29
  30 class Clipping
  31 {
  32     /** This class uses the Liang-Biarsky parametric line-clipping algorithm as described in:
  33             Computer Graphics: principles and practice, 2nd ed.,
  34             James D. Foley et al.,
  35             Section 3.12.4 on page 117.
  36     */
  37
  38 public:
  39     /** @descr  The intersection between an open polygon and a rectangle is
  40             calculated and the resulting lines are placed into the poly-polygon aResult.
  41         @param  rPolygon    The polygon is required to be open, ie. its start and end point
  42             have different coordinates and that it is continuous, ie. has no holes.
  43         @param  rRectangle  The clipping area.
  44         @param  aResult The resulting lines that are the parts of the given polygon lying inside
  45             the clipping area are stored into aResult whose prior content is deleted first.
  46      */
  47     static void clipPolygonAtRectangle(
  48                                 const css::drawing::PolyPolygonShape3D& rPolygon
  49                                 , const ::basegfx::B2DRectangle& rRectangle
  50                                 , css::drawing::PolyPolygonShape3D& aResult
  51                                 , bool bSplitPiecesToDifferentPolygons = true );
  52     static void clipPolygonAtRectangle(
  53                                 const std::vector<std::vector<css::drawing::Position3D>>& rPolygon
  54                                 , const ::basegfx::B2DRectangle& rRectangle
  55                                 , std::vector<std::vector<css::drawing::Position3D>>& aResult
  56                                 , bool bSplitPiecesToDifferentPolygons = true );
  57 };
  58
  59 } //namespace chart
  60
  61 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */