mirror of https://github.com/axmolengine/axmol.git
107 lines
4.2 KiB
C
107 lines
4.2 KiB
C
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/*******************************************************************************
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* Author : Angus Johnson *
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* Version : Clipper2 - ver.1.0.0 *
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* Date : 3 August 2022 *
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* Website : http://www.angusj.com *
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* Copyright : Angus Johnson 2010-2022 *
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* Purpose : Path Offset (Inflate/Shrink) *
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* License : http://www.boost.org/LICENSE_1_0.txt *
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*******************************************************************************/
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#ifndef CLIPPER_OFFSET_H_
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#define CLIPPER_OFFSET_H_
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#include "clipper.core.h"
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namespace Clipper2Lib {
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enum class JoinType { Square, Round, Miter };
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enum class EndType {Polygon, Joined, Butt, Square, Round};
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//Butt : offsets both sides of a path, with square blunt ends
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//Square : offsets both sides of a path, with square extended ends
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//Round : offsets both sides of a path, with round extended ends
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//Joined : offsets both sides of a path, with joined ends
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//Polygon: offsets only one side of a closed path
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class PathGroup {
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public:
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Paths64 paths_in_;
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Paths64 paths_out_;
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Path64 path_;
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bool is_reversed_ = false;
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JoinType join_type_;
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EndType end_type_;
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PathGroup(const Paths64& paths, JoinType join_type, EndType end_type):
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paths_in_(paths), join_type_(join_type), end_type_(end_type) {}
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};
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class ClipperOffset {
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private:
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double delta_ = 0.0;
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double temp_lim_ = 0.0;
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double steps_per_rad_ = 0.0;
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PathD norms;
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Paths64 solution;
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std::vector<PathGroup> groups_;
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JoinType join_type_ = JoinType::Square;
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double miter_limit_ = 0.0;
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double arc_tolerance_ = 0.0;
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bool merge_groups_ = true;
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bool preserve_collinear_ = false;
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bool reverse_solution_ = false;
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void DoSquare(PathGroup& group, const Path64& path, size_t j, size_t k);
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void DoMiter(PathGroup& group, const Path64& path, size_t j, size_t k, double cos_a);
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void DoRound(PathGroup& group, const Point64& pt, const PointD& norm1, const PointD& norm2, double angle);
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void BuildNormals(const Path64& path);
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void OffsetPolygon(PathGroup& group, Path64& path);
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void OffsetOpenJoined(PathGroup& group, Path64& path);
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void OffsetOpenPath(PathGroup& group, Path64& path, EndType endType);
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void OffsetPoint(PathGroup& group, Path64& path, size_t j, size_t& k);
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void DoGroupOffset(PathGroup &group, double delta);
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public:
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ClipperOffset(double miter_limit = 2.0,
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double arc_tolerance = 0.0,
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bool preserve_collinear = false,
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bool reverse_solution = false) :
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miter_limit_(miter_limit), arc_tolerance_(arc_tolerance),
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preserve_collinear_(preserve_collinear),
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reverse_solution_(reverse_solution) { };
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~ClipperOffset() { Clear(); };
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void AddPath(const Path64& path, JoinType jt_, EndType et_);
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void AddPaths(const Paths64& paths, JoinType jt_, EndType et_);
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void AddPath(const PathD &p, JoinType jt_, EndType et_);
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void AddPaths(const PathsD &p, JoinType jt_, EndType et_);
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void Clear() { groups_.clear(); norms.clear(); };
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Paths64 Execute(double delta);
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double MiterLimit() const { return miter_limit_; }
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void MiterLimit(double miter_limit) { miter_limit_ = miter_limit; }
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//ArcTolerance: needed for rounded offsets (See offset_triginometry2.svg)
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double ArcTolerance() const { return arc_tolerance_; }
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void ArcTolerance(double arc_tolerance) { arc_tolerance_ = arc_tolerance; }
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//MergeGroups: A path group is one or more paths added via the AddPath or
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//AddPaths methods. By default these path groups will be offset
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//independently of other groups and this may cause overlaps (intersections).
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//However, when MergeGroups is enabled, any overlapping offsets will be
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//merged (via a clipping union operation) to remove overlaps.
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bool MergeGroups() const { return merge_groups_; }
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void MergeGroups(bool merge_groups) { merge_groups_ = merge_groups; }
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bool PreserveCollinear() const { return preserve_collinear_; }
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void PreserveCollinear(bool preserve_collinear){preserve_collinear_ = preserve_collinear;}
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bool ReverseSolution() const { return reverse_solution_; }
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void ReverseSolution(bool reverse_solution) {reverse_solution_ = reverse_solution;}
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};
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}
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#endif /* CLIPPER_OFFSET_H_ */
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