File indexing completed on 2024-05-12 03:52:09
0001 /******************************************************************************* 0002 * Author : Angus Johnson * 0003 * Date : 24 September 2023 * 0004 * Website : http://www.angusj.com * 0005 * Copyright : Angus Johnson 2010-2023 * 0006 * Purpose : Path Offset (Inflate/Shrink) * 0007 * License : http://www.boost.org/LICENSE_1_0.txt * 0008 *******************************************************************************/ 0009 0010 #ifndef CLIPPER_OFFSET_H_ 0011 #define CLIPPER_OFFSET_H_ 0012 0013 #include "clipper.core.h" 0014 #include "clipper.engine.h" 0015 0016 namespace Clipper2Lib { 0017 0018 enum class JoinType { Square, Bevel, Round, Miter }; 0019 //Square : Joins are 'squared' at exactly the offset distance (more complex code) 0020 //Bevel : Similar to Square, but the offset distance varies with angle (simple code & faster) 0021 0022 enum class EndType {Polygon, Joined, Butt, Square, Round}; 0023 //Butt : offsets both sides of a path, with square blunt ends 0024 //Square : offsets both sides of a path, with square extended ends 0025 //Round : offsets both sides of a path, with round extended ends 0026 //Joined : offsets both sides of a path, with joined ends 0027 //Polygon: offsets only one side of a closed path 0028 0029 typedef std::function<double(const Path64& path, const PathD& path_normals, size_t curr_idx, size_t prev_idx)> DeltaCallback64; 0030 0031 class ClipperOffset { 0032 private: 0033 0034 class Group { 0035 public: 0036 Paths64 paths_in; 0037 Paths64 paths_out; 0038 Path64 path; 0039 bool is_reversed = false; 0040 JoinType join_type; 0041 EndType end_type; 0042 Group(const Paths64& _paths, JoinType _join_type, EndType _end_type) : 0043 paths_in(_paths), join_type(_join_type), end_type(_end_type) {} 0044 }; 0045 0046 int error_code_ = 0; 0047 double delta_ = 0.0; 0048 double group_delta_ = 0.0; 0049 double temp_lim_ = 0.0; 0050 double steps_per_rad_ = 0.0; 0051 double step_sin_ = 0.0; 0052 double step_cos_ = 0.0; 0053 PathD norms; 0054 Paths64 solution; 0055 std::vector<Group> groups_; 0056 JoinType join_type_ = JoinType::Bevel; 0057 EndType end_type_ = EndType::Polygon; 0058 0059 double miter_limit_ = 0.0; 0060 double arc_tolerance_ = 0.0; 0061 bool preserve_collinear_ = false; 0062 bool reverse_solution_ = false; 0063 0064 #ifdef USINGZ 0065 ZCallback64 zCallback64_ = nullptr; 0066 #endif 0067 DeltaCallback64 deltaCallback64_ = nullptr; 0068 0069 void DoBevel(Group& group, const Path64& path, size_t j, size_t k); 0070 void DoSquare(Group& group, const Path64& path, size_t j, size_t k); 0071 void DoMiter(Group& group, const Path64& path, size_t j, size_t k, double cos_a); 0072 void DoRound(Group& group, const Path64& path, size_t j, size_t k, double angle); 0073 void BuildNormals(const Path64& path); 0074 void OffsetPolygon(Group& group, Path64& path); 0075 void OffsetOpenJoined(Group& group, Path64& path); 0076 void OffsetOpenPath(Group& group, Path64& path); 0077 void OffsetPoint(Group& group, Path64& path, size_t j, size_t k); 0078 void DoGroupOffset(Group &group); 0079 void ExecuteInternal(double delta); 0080 public: 0081 explicit ClipperOffset(double miter_limit = 2.0, 0082 double arc_tolerance = 0.0, 0083 bool preserve_collinear = false, 0084 bool reverse_solution = false) : 0085 miter_limit_(miter_limit), arc_tolerance_(arc_tolerance), 0086 preserve_collinear_(preserve_collinear), 0087 reverse_solution_(reverse_solution) { }; 0088 0089 ~ClipperOffset() { Clear(); }; 0090 0091 int ErrorCode() { return error_code_; }; 0092 void AddPath(const Path64& path, JoinType jt_, EndType et_); 0093 void AddPaths(const Paths64& paths, JoinType jt_, EndType et_); 0094 void Clear() { groups_.clear(); norms.clear(); }; 0095 0096 void Execute(double delta, Paths64& paths); 0097 void Execute(double delta, PolyTree64& polytree); 0098 void Execute(DeltaCallback64 delta_cb, Paths64& paths); 0099 0100 double MiterLimit() const { return miter_limit_; } 0101 void MiterLimit(double miter_limit) { miter_limit_ = miter_limit; } 0102 0103 //ArcTolerance: needed for rounded offsets (See offset_triginometry2.svg) 0104 double ArcTolerance() const { return arc_tolerance_; } 0105 void ArcTolerance(double arc_tolerance) { arc_tolerance_ = arc_tolerance; } 0106 0107 bool PreserveCollinear() const { return preserve_collinear_; } 0108 void PreserveCollinear(bool preserve_collinear){preserve_collinear_ = preserve_collinear;} 0109 0110 bool ReverseSolution() const { return reverse_solution_; } 0111 void ReverseSolution(bool reverse_solution) {reverse_solution_ = reverse_solution;} 0112 0113 #ifdef USINGZ 0114 void SetZCallback(ZCallback64 cb) { zCallback64_ = cb; } 0115 #endif 0116 void SetDeltaCallback(DeltaCallback64 cb) { deltaCallback64_ = cb; } 0117 0118 }; 0119 0120 } 0121 #endif /* CLIPPER_OFFSET_H_ */