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Diffstat (limited to 'thirdparty/clipper2/include/clipper2/clipper.offset.h')
| -rw-r--r-- | thirdparty/clipper2/include/clipper2/clipper.offset.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/thirdparty/clipper2/include/clipper2/clipper.offset.h b/thirdparty/clipper2/include/clipper2/clipper.offset.h new file mode 100644 index 0000000000..f5d47e07ee --- /dev/null +++ b/thirdparty/clipper2/include/clipper2/clipper.offset.h @@ -0,0 +1,114 @@ +/******************************************************************************* +* Author : Angus Johnson * +* Date : 22 March 2023 * +* Website : http://www.angusj.com * +* Copyright : Angus Johnson 2010-2023 * +* Purpose : Path Offset (Inflate/Shrink) * +* License : http://www.boost.org/LICENSE_1_0.txt * +*******************************************************************************/ + +#ifndef CLIPPER_OFFSET_H_ +#define CLIPPER_OFFSET_H_ + +#include "clipper.core.h" +#include "clipper.engine.h" + +namespace Clipper2Lib { + +enum class JoinType { Square, Round, Miter }; + +enum class EndType {Polygon, Joined, Butt, Square, Round}; +//Butt : offsets both sides of a path, with square blunt ends +//Square : offsets both sides of a path, with square extended ends +//Round : offsets both sides of a path, with round extended ends +//Joined : offsets both sides of a path, with joined ends +//Polygon: offsets only one side of a closed path + + +class ClipperOffset { +private: + + class Group { + public: + Paths64 paths_in; + Paths64 paths_out; + Path64 path; + bool is_reversed = false; + JoinType join_type; + EndType end_type; + Group(const Paths64& _paths, JoinType _join_type, EndType _end_type) : + paths_in(_paths), join_type(_join_type), end_type(_end_type) {} + }; + + int error_code_ = 0; + double delta_ = 0.0; + double group_delta_ = 0.0; + double abs_group_delta_ = 0.0; + double temp_lim_ = 0.0; + double steps_per_rad_ = 0.0; + double step_sin_ = 0.0; + double step_cos_ = 0.0; + PathD norms; + Paths64 solution; + std::vector<Group> groups_; + JoinType join_type_ = JoinType::Square; + EndType end_type_ = EndType::Polygon; + + double miter_limit_ = 0.0; + double arc_tolerance_ = 0.0; + bool preserve_collinear_ = false; + bool reverse_solution_ = false; + +#ifdef USINGZ + ZCallback64 zCallback64_ = nullptr; +#endif + + void DoSquare(Group& group, const Path64& path, size_t j, size_t k); + void DoMiter(Group& group, const Path64& path, size_t j, size_t k, double cos_a); + void DoRound(Group& group, const Path64& path, size_t j, size_t k, double angle); + void BuildNormals(const Path64& path); + void OffsetPolygon(Group& group, Path64& path); + void OffsetOpenJoined(Group& group, Path64& path); + void OffsetOpenPath(Group& group, Path64& path); + void OffsetPoint(Group& group, Path64& path, size_t j, size_t& k); + void DoGroupOffset(Group &group); + void ExecuteInternal(double delta); +public: + explicit ClipperOffset(double miter_limit = 2.0, + double arc_tolerance = 0.0, + bool preserve_collinear = false, + bool reverse_solution = false) : + miter_limit_(miter_limit), arc_tolerance_(arc_tolerance), + preserve_collinear_(preserve_collinear), + reverse_solution_(reverse_solution) { }; + + ~ClipperOffset() { Clear(); }; + + int ErrorCode() { return error_code_; }; + void AddPath(const Path64& path, JoinType jt_, EndType et_); + void AddPaths(const Paths64& paths, JoinType jt_, EndType et_); + void Clear() { groups_.clear(); norms.clear(); }; + + void Execute(double delta, Paths64& paths); + void Execute(double delta, PolyTree64& polytree); + + double MiterLimit() const { return miter_limit_; } + void MiterLimit(double miter_limit) { miter_limit_ = miter_limit; } + + //ArcTolerance: needed for rounded offsets (See offset_triginometry2.svg) + double ArcTolerance() const { return arc_tolerance_; } + void ArcTolerance(double arc_tolerance) { arc_tolerance_ = arc_tolerance; } + + bool PreserveCollinear() const { return preserve_collinear_; } + void PreserveCollinear(bool preserve_collinear){preserve_collinear_ = preserve_collinear;} + + bool ReverseSolution() const { return reverse_solution_; } + void ReverseSolution(bool reverse_solution) {reverse_solution_ = reverse_solution;} + +#ifdef USINGZ + void SetZCallback(ZCallback64 cb) { zCallback64_ = cb; } +#endif +}; + +} +#endif /* CLIPPER_OFFSET_H_ */ |