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426 lines
15 KiB
C++
426 lines
15 KiB
C++
/*******************************************************************************
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* *
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* Author : Angus Johnson *
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* Version : 6.4.2 *
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* Date : 27 February 2017 *
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* Website : http://www.angusj.com *
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* Copyright : Angus Johnson 2010-2017 *
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* *
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* License: *
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* Use, modification & distribution is subject to Boost Software License Ver 1. *
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* http://www.boost.org/LICENSE_1_0.txt *
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* *
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* Attributions: *
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* The code in this library is an extension of Bala Vatti's clipping algorithm: *
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* "A generic solution to polygon clipping" *
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* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63. *
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* http://portal.acm.org/citation.cfm?id=129906 *
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* *
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* Computer graphics and geometric modeling: implementation and algorithms *
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* By Max K. Agoston *
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* Springer; 1 edition (January 4, 2005) *
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* http://books.google.com/books?q=vatti+clipping+agoston *
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* *
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* See also: *
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* "Polygon Offsetting by Computing Winding Numbers" *
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* Paper no. DETC2005-85513 pp. 565-575 *
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* ASME 2005 International Design Engineering Technical Conferences *
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* and Computers and Information in Engineering Conference (IDETC/CIE2005) *
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* September 24-28, 2005 , Long Beach, California, USA *
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* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf *
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* *
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*******************************************************************************/
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#pragma once
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#ifndef clipper_hpp
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#define clipper_hpp
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#define CLIPPER_VERSION "6.4.2"
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// use_int32: When enabled 32bit ints are used instead of 64bit ints. This
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// improve performance but coordinate values are limited to the range +/- 46340
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//#define use_int32
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// use_xyz: adds a Z member to IntPoint. Adds a minor cost to perfomance.
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//#define use_xyz
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// use_lines: Enables line clipping. Adds a very minor cost to performance.
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#define use_lines
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// use_deprecated: Enables temporary support for the obsolete functions
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//#define use_deprecated
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#include <cstdlib>
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#include <cstring>
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#include <functional>
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#include <list>
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#include <ostream>
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#include <queue>
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#include <set>
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#include <stdexcept>
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#include <vector>
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namespace ClipperLib {
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enum ClipType { ctIntersection, ctUnion, ctDifference, ctXor };
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enum PolyType { ptSubject, ptClip };
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// By far the most widely used winding rules for polygon filling are
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// EvenOdd & NonZero (GDI, GDI+, XLib, OpenGL, Cairo, AGG, Quartz, SVG, Gr32)
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// Others rules include Positive, Negative and ABS_GTR_EQ_TWO (only in OpenGL)
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// see http://glprogramming.com/red/chapter11.html
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enum PolyFillType { pftEvenOdd, pftNonZero, pftPositive, pftNegative };
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#ifdef use_int32
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typedef int cInt;
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static cInt const loRange = 0x7FFF;
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static cInt const hiRange = 0x7FFF;
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#else
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typedef signed long long cInt;
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static cInt const loRange = 0x3FFFFFFF;
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static cInt const hiRange = 0x3FFFFFFFFFFFFFFFLL;
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typedef signed long long long64; // used by Int128 class
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typedef unsigned long long ulong64;
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#endif
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struct IntPoint {
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cInt X;
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cInt Y;
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#ifdef use_xyz
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cInt Z;
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IntPoint(cInt x = 0, cInt y = 0, cInt z = 0) : X(x), Y(y), Z(z){};
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#else
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IntPoint(cInt x = 0, cInt y = 0) : X(x), Y(y){};
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#endif
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friend inline bool operator==(const IntPoint &a, const IntPoint &b) {
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return a.X == b.X && a.Y == b.Y;
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}
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friend inline bool operator!=(const IntPoint &a, const IntPoint &b) {
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return a.X != b.X || a.Y != b.Y;
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}
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};
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//------------------------------------------------------------------------------
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typedef std::vector<IntPoint> Path;
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typedef std::vector<Path> Paths;
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inline Path &operator<<(Path &poly, const IntPoint &p) {
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poly.push_back(p);
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return poly;
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}
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inline Paths &operator<<(Paths &polys, const Path &p) {
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polys.push_back(p);
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return polys;
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}
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std::ostream &operator<<(std::ostream &s, const IntPoint &p);
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std::ostream &operator<<(std::ostream &s, const Path &p);
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std::ostream &operator<<(std::ostream &s, const Paths &p);
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struct DoublePoint {
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double X;
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double Y;
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DoublePoint(double x = 0, double y = 0) : X(x), Y(y) {}
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DoublePoint(IntPoint ip) : X((double)ip.X), Y((double)ip.Y) {}
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};
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//------------------------------------------------------------------------------
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#ifdef use_xyz
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typedef void (*ZFillCallback)(IntPoint &e1bot, IntPoint &e1top, IntPoint &e2bot,
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IntPoint &e2top, IntPoint &pt);
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#endif
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enum InitOptions {
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ioReverseSolution = 1,
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ioStrictlySimple = 2,
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ioPreserveCollinear = 4
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};
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enum JoinType { jtSquare, jtRound, jtMiter };
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enum EndType {
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etClosedPolygon,
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etClosedLine,
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etOpenButt,
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etOpenSquare,
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etOpenRound
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};
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class PolyNode;
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typedef std::vector<PolyNode *> PolyNodes;
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class PolyNode {
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public:
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PolyNode();
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virtual ~PolyNode(){};
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Path Contour;
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PolyNodes Childs;
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PolyNode *Parent;
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PolyNode *GetNext() const;
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bool IsHole() const;
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bool IsOpen() const;
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int ChildCount() const;
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private:
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// PolyNode& operator =(PolyNode& other);
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unsigned Index; // node index in Parent.Childs
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bool m_IsOpen;
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JoinType m_jointype;
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EndType m_endtype;
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PolyNode *GetNextSiblingUp() const;
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void AddChild(PolyNode &child);
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friend class Clipper; // to access Index
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friend class ClipperOffset;
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};
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class PolyTree : public PolyNode {
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public:
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~PolyTree() { Clear(); };
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PolyNode *GetFirst() const;
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void Clear();
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int Total() const;
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private:
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// PolyTree& operator =(PolyTree& other);
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PolyNodes AllNodes;
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friend class Clipper; // to access AllNodes
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};
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bool Orientation(const Path &poly);
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double Area(const Path &poly);
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int PointInPolygon(const IntPoint &pt, const Path &path);
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void SimplifyPolygon(const Path &in_poly, Paths &out_polys,
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PolyFillType fillType = pftEvenOdd);
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void SimplifyPolygons(const Paths &in_polys, Paths &out_polys,
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PolyFillType fillType = pftEvenOdd);
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void SimplifyPolygons(Paths &polys, PolyFillType fillType = pftEvenOdd);
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void CleanPolygon(const Path &in_poly, Path &out_poly, double distance = 1.415);
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void CleanPolygon(Path &poly, double distance = 1.415);
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void CleanPolygons(const Paths &in_polys, Paths &out_polys,
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double distance = 1.415);
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void CleanPolygons(Paths &polys, double distance = 1.415);
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void MinkowskiSum(const Path &pattern, const Path &path, Paths &solution,
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bool pathIsClosed);
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void MinkowskiSum(const Path &pattern, const Paths &paths, Paths &solution,
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bool pathIsClosed);
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void MinkowskiDiff(const Path &poly1, const Path &poly2, Paths &solution);
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void PolyTreeToPaths(const PolyTree &polytree, Paths &paths);
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void ClosedPathsFromPolyTree(const PolyTree &polytree, Paths &paths);
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void OpenPathsFromPolyTree(PolyTree &polytree, Paths &paths);
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void ReversePath(Path &p);
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void ReversePaths(Paths &p);
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struct IntRect {
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cInt left;
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cInt top;
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cInt right;
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cInt bottom;
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};
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// enums that are used internally ...
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enum EdgeSide { esLeft = 1, esRight = 2 };
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// forward declarations (for stuff used internally) ...
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struct TEdge;
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struct IntersectNode;
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struct LocalMinimum;
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struct OutPt;
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struct OutRec;
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struct Join;
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typedef std::vector<OutRec *> PolyOutList;
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typedef std::vector<TEdge *> EdgeList;
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typedef std::vector<Join *> JoinList;
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typedef std::vector<IntersectNode *> IntersectList;
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//------------------------------------------------------------------------------
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// ClipperBase is the ancestor to the Clipper class. It should not be
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// instantiated directly. This class simply abstracts the conversion of sets of
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// polygon coordinates into edge objects that are stored in a LocalMinima list.
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class ClipperBase {
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public:
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ClipperBase();
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virtual ~ClipperBase();
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virtual bool AddPath(const Path &pg, PolyType PolyTyp, bool Closed);
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bool AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed);
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virtual void Clear();
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IntRect GetBounds();
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bool PreserveCollinear() { return m_PreserveCollinear; };
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void PreserveCollinear(bool value) { m_PreserveCollinear = value; };
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protected:
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void DisposeLocalMinimaList();
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TEdge *AddBoundsToLML(TEdge *e, bool IsClosed);
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virtual void Reset();
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TEdge *ProcessBound(TEdge *E, bool IsClockwise);
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void InsertScanbeam(const cInt Y);
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bool PopScanbeam(cInt &Y);
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bool LocalMinimaPending();
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bool PopLocalMinima(cInt Y, const LocalMinimum *&locMin);
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OutRec *CreateOutRec();
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void DisposeAllOutRecs();
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void DisposeOutRec(PolyOutList::size_type index);
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void SwapPositionsInAEL(TEdge *edge1, TEdge *edge2);
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void DeleteFromAEL(TEdge *e);
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void UpdateEdgeIntoAEL(TEdge *&e);
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typedef std::vector<LocalMinimum> MinimaList;
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MinimaList::iterator m_CurrentLM;
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MinimaList m_MinimaList;
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bool m_UseFullRange;
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EdgeList m_edges;
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bool m_PreserveCollinear;
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bool m_HasOpenPaths;
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PolyOutList m_PolyOuts;
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TEdge *m_ActiveEdges;
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typedef std::priority_queue<cInt> ScanbeamList;
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ScanbeamList m_Scanbeam;
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};
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//------------------------------------------------------------------------------
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class Clipper : public virtual ClipperBase {
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public:
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Clipper(int initOptions = 0);
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bool Execute(ClipType clipType, Paths &solution,
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PolyFillType fillType = pftEvenOdd);
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bool Execute(ClipType clipType, Paths &solution, PolyFillType subjFillType,
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PolyFillType clipFillType);
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bool Execute(ClipType clipType, PolyTree &polytree,
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PolyFillType fillType = pftEvenOdd);
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bool Execute(ClipType clipType, PolyTree &polytree, PolyFillType subjFillType,
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PolyFillType clipFillType);
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bool ReverseSolution() { return m_ReverseOutput; };
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void ReverseSolution(bool value) { m_ReverseOutput = value; };
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bool StrictlySimple() { return m_StrictSimple; };
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void StrictlySimple(bool value) { m_StrictSimple = value; };
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// set the callback function for z value filling on intersections (otherwise Z
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// is 0)
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#ifdef use_xyz
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void ZFillFunction(ZFillCallback zFillFunc);
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#endif
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protected:
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virtual bool ExecuteInternal();
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private:
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JoinList m_Joins;
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JoinList m_GhostJoins;
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IntersectList m_IntersectList;
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ClipType m_ClipType;
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typedef std::list<cInt> MaximaList;
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MaximaList m_Maxima;
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TEdge *m_SortedEdges;
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bool m_ExecuteLocked;
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PolyFillType m_ClipFillType;
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PolyFillType m_SubjFillType;
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bool m_ReverseOutput;
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bool m_UsingPolyTree;
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bool m_StrictSimple;
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#ifdef use_xyz
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ZFillCallback m_ZFill; // custom callback
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#endif
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void SetWindingCount(TEdge &edge);
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bool IsEvenOddFillType(const TEdge &edge) const;
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bool IsEvenOddAltFillType(const TEdge &edge) const;
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void InsertLocalMinimaIntoAEL(const cInt botY);
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void InsertEdgeIntoAEL(TEdge *edge, TEdge *startEdge);
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void AddEdgeToSEL(TEdge *edge);
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bool PopEdgeFromSEL(TEdge *&edge);
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void CopyAELToSEL();
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void DeleteFromSEL(TEdge *e);
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void SwapPositionsInSEL(TEdge *edge1, TEdge *edge2);
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bool IsContributing(const TEdge &edge) const;
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bool IsTopHorz(const cInt XPos);
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void DoMaxima(TEdge *e);
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void ProcessHorizontals();
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void ProcessHorizontal(TEdge *horzEdge);
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void AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);
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OutPt *AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);
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OutRec *GetOutRec(int idx);
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void AppendPolygon(TEdge *e1, TEdge *e2);
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void IntersectEdges(TEdge *e1, TEdge *e2, IntPoint &pt);
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OutPt *AddOutPt(TEdge *e, const IntPoint &pt);
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OutPt *GetLastOutPt(TEdge *e);
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bool ProcessIntersections(const cInt topY);
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void BuildIntersectList(const cInt topY);
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void ProcessIntersectList();
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void ProcessEdgesAtTopOfScanbeam(const cInt topY);
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void BuildResult(Paths &polys);
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void BuildResult2(PolyTree &polytree);
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void SetHoleState(TEdge *e, OutRec *outrec);
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void DisposeIntersectNodes();
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bool FixupIntersectionOrder();
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void FixupOutPolygon(OutRec &outrec);
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void FixupOutPolyline(OutRec &outrec);
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bool IsHole(TEdge *e);
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bool FindOwnerFromSplitRecs(OutRec &outRec, OutRec *&currOrfl);
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void FixHoleLinkage(OutRec &outrec);
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void AddJoin(OutPt *op1, OutPt *op2, const IntPoint offPt);
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void ClearJoins();
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void ClearGhostJoins();
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void AddGhostJoin(OutPt *op, const IntPoint offPt);
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bool JoinPoints(Join *j, OutRec *outRec1, OutRec *outRec2);
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void JoinCommonEdges();
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void DoSimplePolygons();
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void FixupFirstLefts1(OutRec *OldOutRec, OutRec *NewOutRec);
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void FixupFirstLefts2(OutRec *InnerOutRec, OutRec *OuterOutRec);
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void FixupFirstLefts3(OutRec *OldOutRec, OutRec *NewOutRec);
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#ifdef use_xyz
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void SetZ(IntPoint &pt, TEdge &e1, TEdge &e2);
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#endif
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};
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//------------------------------------------------------------------------------
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class ClipperOffset {
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public:
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ClipperOffset(double miterLimit = 2.0, double roundPrecision = 0.25);
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~ClipperOffset();
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void AddPath(const Path &path, JoinType joinType, EndType endType);
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void AddPaths(const Paths &paths, JoinType joinType, EndType endType);
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void Execute(Paths &solution, double delta);
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void Execute(PolyTree &solution, double delta);
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void Clear();
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double MiterLimit;
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double ArcTolerance;
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private:
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Paths m_destPolys;
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Path m_srcPoly;
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Path m_destPoly;
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std::vector<DoublePoint> m_normals;
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double m_delta, m_sinA, m_sin, m_cos;
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double m_miterLim, m_StepsPerRad;
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IntPoint m_lowest;
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PolyNode m_polyNodes;
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void FixOrientations();
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void DoOffset(double delta);
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void OffsetPoint(int j, int &k, JoinType jointype);
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void DoSquare(int j, int k);
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void DoMiter(int j, int k, double r);
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void DoRound(int j, int k);
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};
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//------------------------------------------------------------------------------
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class clipperException : public std::exception {
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public:
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clipperException(const char *description) : m_descr(description) {}
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virtual ~clipperException() throw() {}
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virtual const char *what() const throw() { return m_descr.c_str(); }
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private:
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std::string m_descr;
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};
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//------------------------------------------------------------------------------
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} // ClipperLib namespace
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#endif // clipper_hpp
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