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Adding optional clipping to tippecanoe-overzoom (#298)

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* Plumb a clip bounding box around through overzoom

* Actually do some clipping

* Add a test

* Fix post-binning clipping

* Factoring out geometry parsing from feature parsing

* Accept a clip polygon argument to tippecanoe-overzoom

* Progress in the direction of polygon clipping

* Fix the wagyu flags. We need intersection, not union

* Remove debug spew

* Clip points to polygon bounds too

* Copy the geometric binning code to serve as intersection-finding code

* Add clipper2 for linestring clipping

* Compiles, but does not actually seem to clip. Hmm.

* Oh, it helps if I actually call the function

* Add clipping tests

* Add missing fixture, and don't crash if it is missing

* Remember to do polygon clipping after binning too

* Fix scaling before post-binning clipping. Add test.

* Remove unused parts of clipper

* Rename for consistency

* Revert accidentally added line

* Clip the clip regions to the tile bounds to reduce their complexity

* Add a test of clipping the clip region down to the tile boundary

* Update version and changelog
This commit is contained in:
Erica Fischer
2024-11-27 13:43:40 -08:00
committed by GitHub
parent 11e3196c9a
commit dcc616d3d4
31 changed files with 9458 additions and 163 deletions
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clipper2/LICENSE
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Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
clipper2/include/clipper2/clipper.core.h
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clipper2/include/clipper2/clipper.engine.h
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/*******************************************************************************
* Author : Angus Johnson *
* Date : 17 September 2024 *
* Website : http://www.angusj.com *
* Copyright : Angus Johnson 2010-2024 *
* Purpose : This is the main polygon clipping module *
* License : http://www.boost.org/LICENSE_1_0.txt *
*******************************************************************************/
#ifndef CLIPPER_ENGINE_H
#define CLIPPER_ENGINE_H
#include <cstdlib>
#include <stdint.h> //#541
#include <iostream>
#include <queue>
#include <vector>
#include <functional>
#include <numeric>
#include <memory>
#include "clipper2/clipper.core.h"
namespace Clipper2Lib {
struct Scanline;
struct IntersectNode;
struct Active;
struct Vertex;
struct LocalMinima;
struct OutRec;
struct HorzSegment;
//Note: all clipping operations except for Difference are commutative.
enum class ClipType { NoClip, Intersection, Union, Difference, Xor };
enum class PathType { Subject, Clip };
enum class JoinWith { NoJoin, Left, Right };
enum class VertexFlags : uint32_t {
Empty = 0, OpenStart = 1, OpenEnd = 2, LocalMax = 4, LocalMin = 8
};
constexpr enum VertexFlags operator &(enum VertexFlags a, enum VertexFlags b)
{
return (enum VertexFlags)(uint32_t(a) & uint32_t(b));
}
constexpr enum VertexFlags operator |(enum VertexFlags a, enum VertexFlags b)
{
return (enum VertexFlags)(uint32_t(a) | uint32_t(b));
}
struct Vertex {
Point64 pt;
Vertex* next = nullptr;
Vertex* prev = nullptr;
VertexFlags flags = VertexFlags::Empty;
};
struct OutPt {
Point64 pt;
OutPt* next = nullptr;
OutPt* prev = nullptr;
OutRec* outrec;
HorzSegment* horz = nullptr;
OutPt(const Point64& pt_, OutRec* outrec_): pt(pt_), outrec(outrec_) {
next = this;
prev = this;
}
};
class PolyPath;
class PolyPath64;
class PolyPathD;
using PolyTree64 = PolyPath64;
using PolyTreeD = PolyPathD;
struct OutRec;
typedef std::vector<OutRec*> OutRecList;
//OutRec: contains a path in the clipping solution. Edges in the AEL will
//have OutRec pointers assigned when they form part of the clipping solution.
struct OutRec {
size_t idx = 0;
OutRec* owner = nullptr;
Active* front_edge = nullptr;
Active* back_edge = nullptr;
OutPt* pts = nullptr;
PolyPath* polypath = nullptr;
OutRecList* splits = nullptr;
OutRec* recursive_split = nullptr;
Rect64 bounds = {};
Path64 path;
bool is_open = false;
~OutRec() {
if (splits) delete splits;
// nb: don't delete the split pointers
// as these are owned by ClipperBase's outrec_list_
};
};
///////////////////////////////////////////////////////////////////
//Important: UP and DOWN here are premised on Y-axis positive down
//displays, which is the orientation used in Clipper's development.
///////////////////////////////////////////////////////////////////
struct Active {
Point64 bot;
Point64 top;
int64_t curr_x = 0; //current (updated at every new scanline)
double dx = 0.0;
int wind_dx = 1; //1 or -1 depending on winding direction
int wind_cnt = 0;
int wind_cnt2 = 0; //winding count of the opposite polytype
OutRec* outrec = nullptr;
//AEL: 'active edge list' (Vatti's AET - active edge table)
// a linked list of all edges (from left to right) that are present
// (or 'active') within the current scanbeam (a horizontal 'beam' that
// sweeps from bottom to top over the paths in the clipping operation).
Active* prev_in_ael = nullptr;
Active* next_in_ael = nullptr;
//SEL: 'sorted edge list' (Vatti's ST - sorted table)
// linked list used when sorting edges into their new positions at the
// top of scanbeams, but also (re)used to process horizontals.
Active* prev_in_sel = nullptr;
Active* next_in_sel = nullptr;
Active* jump = nullptr;
Vertex* vertex_top = nullptr;
LocalMinima* local_min = nullptr; // the bottom of an edge 'bound' (also Vatti)
bool is_left_bound = false;
JoinWith join_with = JoinWith::NoJoin;
};
struct LocalMinima {
Vertex* vertex;
PathType polytype;
bool is_open;
LocalMinima(Vertex* v, PathType pt, bool open) :
vertex(v), polytype(pt), is_open(open){}
};
struct IntersectNode {
Point64 pt;
Active* edge1;
Active* edge2;
IntersectNode() : pt(Point64(0,0)), edge1(NULL), edge2(NULL) {}
IntersectNode(Active* e1, Active* e2, Point64& pt_) :
pt(pt_), edge1(e1), edge2(e2) {}
};
struct HorzSegment {
OutPt* left_op;
OutPt* right_op = nullptr;
bool left_to_right = true;
HorzSegment() : left_op(nullptr) { }
explicit HorzSegment(OutPt* op) : left_op(op) { }
};
struct HorzJoin {
OutPt* op1 = nullptr;
OutPt* op2 = nullptr;
HorzJoin() {};
explicit HorzJoin(OutPt* ltr, OutPt* rtl) : op1(ltr), op2(rtl) { }
};
#ifdef USINGZ
typedef std::function<void(const Point64& e1bot, const Point64& e1top,
const Point64& e2bot, const Point64& e2top, Point64& pt)> ZCallback64;
typedef std::function<void(const PointD& e1bot, const PointD& e1top,
const PointD& e2bot, const PointD& e2top, PointD& pt)> ZCallbackD;
#endif
typedef std::vector<HorzSegment> HorzSegmentList;
typedef std::unique_ptr<LocalMinima> LocalMinima_ptr;
typedef std::vector<LocalMinima_ptr> LocalMinimaList;
typedef std::vector<IntersectNode> IntersectNodeList;
// ReuseableDataContainer64 ------------------------------------------------
class ReuseableDataContainer64 {
private:
friend class ClipperBase;
LocalMinimaList minima_list_;
std::vector<Vertex*> vertex_lists_;
void AddLocMin(Vertex& vert, PathType polytype, bool is_open);
public:
virtual ~ReuseableDataContainer64();
void Clear();
void AddPaths(const Paths64& paths, PathType polytype, bool is_open);
};
// ClipperBase -------------------------------------------------------------
class ClipperBase {
private:
ClipType cliptype_ = ClipType::NoClip;
FillRule fillrule_ = FillRule::EvenOdd;
FillRule fillpos = FillRule::Positive;
int64_t bot_y_ = 0;
bool minima_list_sorted_ = false;
bool using_polytree_ = false;
Active* actives_ = nullptr;
Active *sel_ = nullptr;
LocalMinimaList minima_list_; //pointers in case of memory reallocs
LocalMinimaList::iterator current_locmin_iter_;
std::vector<Vertex*> vertex_lists_;
std::priority_queue<int64_t> scanline_list_;
IntersectNodeList intersect_nodes_;
HorzSegmentList horz_seg_list_;
std::vector<HorzJoin> horz_join_list_;
void Reset();
inline void InsertScanline(int64_t y);
inline bool PopScanline(int64_t &y);
inline bool PopLocalMinima(int64_t y, LocalMinima*& local_minima);
void DisposeAllOutRecs();
void DisposeVerticesAndLocalMinima();
void DeleteEdges(Active*& e);
inline void AddLocMin(Vertex &vert, PathType polytype, bool is_open);
bool IsContributingClosed(const Active &e) const;
inline bool IsContributingOpen(const Active &e) const;
void SetWindCountForClosedPathEdge(Active &edge);
void SetWindCountForOpenPathEdge(Active &e);
void InsertLocalMinimaIntoAEL(int64_t bot_y);
void InsertLeftEdge(Active &e);
inline void PushHorz(Active &e);
inline bool PopHorz(Active *&e);
inline OutPt* StartOpenPath(Active &e, const Point64& pt);
inline void UpdateEdgeIntoAEL(Active *e);
void IntersectEdges(Active &e1, Active &e2, const Point64& pt);
inline void DeleteFromAEL(Active &e);
inline void AdjustCurrXAndCopyToSEL(const int64_t top_y);
void DoIntersections(const int64_t top_y);
void AddNewIntersectNode(Active &e1, Active &e2, const int64_t top_y);
bool BuildIntersectList(const int64_t top_y);
void ProcessIntersectList();
void SwapPositionsInAEL(Active& edge1, Active& edge2);
OutRec* NewOutRec();
OutPt* AddOutPt(const Active &e, const Point64& pt);
OutPt* AddLocalMinPoly(Active &e1, Active &e2,
const Point64& pt, bool is_new = false);
OutPt* AddLocalMaxPoly(Active &e1, Active &e2, const Point64& pt);
void DoHorizontal(Active &horz);
bool ResetHorzDirection(const Active &horz, const Vertex* max_vertex,
int64_t &horz_left, int64_t &horz_right);
void DoTopOfScanbeam(const int64_t top_y);
Active *DoMaxima(Active &e);
void JoinOutrecPaths(Active &e1, Active &e2);
void FixSelfIntersects(OutRec* outrec);
void DoSplitOp(OutRec* outRec, OutPt* splitOp);
inline void AddTrialHorzJoin(OutPt* op);
void ConvertHorzSegsToJoins();
void ProcessHorzJoins();
void Split(Active& e, const Point64& pt);
inline void CheckJoinLeft(Active& e,
const Point64& pt, bool check_curr_x = false);
inline void CheckJoinRight(Active& e,
const Point64& pt, bool check_curr_x = false);
protected:
bool preserve_collinear_ = true;
bool reverse_solution_ = false;
int error_code_ = 0;
bool has_open_paths_ = false;
bool succeeded_ = true;
OutRecList outrec_list_; //pointers in case list memory reallocated
bool ExecuteInternal(ClipType ct, FillRule ft, bool use_polytrees);
void CleanCollinear(OutRec* outrec);
bool CheckBounds(OutRec* outrec);
bool CheckSplitOwner(OutRec* outrec, OutRecList* splits);
void RecursiveCheckOwners(OutRec* outrec, PolyPath* polypath);
#ifdef USINGZ
ZCallback64 zCallback_ = nullptr;
void SetZ(const Active& e1, const Active& e2, Point64& pt);
#endif
void CleanUp(); // unlike Clear, CleanUp preserves added paths
void AddPath(const Path64& path, PathType polytype, bool is_open);
void AddPaths(const Paths64& paths, PathType polytype, bool is_open);
public:
virtual ~ClipperBase();
int ErrorCode() const { return error_code_; };
void PreserveCollinear(bool val) { preserve_collinear_ = val; };
bool PreserveCollinear() const { return preserve_collinear_;};
void ReverseSolution(bool val) { reverse_solution_ = val; };
bool ReverseSolution() const { return reverse_solution_; };
void Clear();
void AddReuseableData(const ReuseableDataContainer64& reuseable_data);
#ifdef USINGZ
int64_t DefaultZ = 0;
#endif
};
// PolyPath / PolyTree --------------------------------------------------------
//PolyTree: is intended as a READ-ONLY data structure for CLOSED paths returned
//by clipping operations. While this structure is more complex than the
//alternative Paths structure, it does preserve path 'ownership' - ie those
//paths that contain (or own) other paths. This will be useful to some users.
class PolyPath {
protected:
PolyPath* parent_;
public:
PolyPath(PolyPath* parent = nullptr): parent_(parent){}
virtual ~PolyPath() {};
//https://en.cppreference.com/w/cpp/language/rule_of_three
PolyPath(const PolyPath&) = delete;
PolyPath& operator=(const PolyPath&) = delete;
unsigned Level() const
{
unsigned result = 0;
const PolyPath* p = parent_;
while (p) { ++result; p = p->parent_; }
return result;
}
virtual PolyPath* AddChild(const Path64& path) = 0;
virtual void Clear() = 0;
virtual size_t Count() const { return 0; }
const PolyPath* Parent() const { return parent_; }
bool IsHole() const
{
unsigned lvl = Level();
//Even levels except level 0
return lvl && !(lvl & 1);
}
};
typedef typename std::vector<std::unique_ptr<PolyPath64>> PolyPath64List;
typedef typename std::vector<std::unique_ptr<PolyPathD>> PolyPathDList;
class PolyPath64 : public PolyPath {
private:
PolyPath64List childs_;
Path64 polygon_;
public:
explicit PolyPath64(PolyPath64* parent = nullptr) : PolyPath(parent) {}
explicit PolyPath64(PolyPath64* parent, const Path64& path) : PolyPath(parent) { polygon_ = path; }
~PolyPath64() {
childs_.resize(0);
}
PolyPath64* operator [] (size_t index) const
{
return childs_[index].get(); //std::unique_ptr
}
PolyPath64* Child(size_t index) const
{
return childs_[index].get();
}
PolyPath64List::const_iterator begin() const { return childs_.cbegin(); }
PolyPath64List::const_iterator end() const { return childs_.cend(); }
PolyPath64* AddChild(const Path64& path) override
{
return childs_.emplace_back(std::make_unique<PolyPath64>(this, path)).get();
}
void Clear() override
{
childs_.resize(0);
}
size_t Count() const override
{
return childs_.size();
}
const Path64& Polygon() const { return polygon_; };
double Area() const
{
return std::accumulate(childs_.cbegin(), childs_.cend(),
Clipper2Lib::Area<int64_t>(polygon_),
[](double a, const auto& child) {return a + child->Area(); });
}
};
class PolyPathD : public PolyPath {
private:
PolyPathDList childs_;
double scale_;
PathD polygon_;
public:
explicit PolyPathD(PolyPathD* parent = nullptr) : PolyPath(parent)
{
scale_ = parent ? parent->scale_ : 1.0;
}
explicit PolyPathD(PolyPathD* parent, const Path64& path) : PolyPath(parent)
{
scale_ = parent ? parent->scale_ : 1.0;
int error_code = 0;
polygon_ = ScalePath<double, int64_t>(path, scale_, error_code);
}
explicit PolyPathD(PolyPathD* parent, const PathD& path) : PolyPath(parent)
{
scale_ = parent ? parent->scale_ : 1.0;
polygon_ = path;
}
~PolyPathD() {
childs_.resize(0);
}
PolyPathD* operator [] (size_t index) const
{
return childs_[index].get();
}
PolyPathD* Child(size_t index) const
{
return childs_[index].get();
}
PolyPathDList::const_iterator begin() const { return childs_.cbegin(); }
PolyPathDList::const_iterator end() const { return childs_.cend(); }
void SetScale(double value) { scale_ = value; }
double Scale() const { return scale_; }
PolyPathD* AddChild(const Path64& path) override
{
return childs_.emplace_back(std::make_unique<PolyPathD>(this, path)).get();
}
PolyPathD* AddChild(const PathD& path)
{
return childs_.emplace_back(std::make_unique<PolyPathD>(this, path)).get();
}
void Clear() override
{
childs_.resize(0);
}
size_t Count() const override
{
return childs_.size();
}
const PathD& Polygon() const { return polygon_; };
double Area() const
{
return std::accumulate(childs_.begin(), childs_.end(),
Clipper2Lib::Area<double>(polygon_),
[](double a, const auto& child) {return a + child->Area(); });
}
};
class Clipper64 : public ClipperBase
{
private:
void BuildPaths64(Paths64& solutionClosed, Paths64* solutionOpen);
void BuildTree64(PolyPath64& polytree, Paths64& open_paths);
public:
#ifdef USINGZ
void SetZCallback(ZCallback64 cb) { zCallback_ = cb; }
#endif
void AddSubject(const Paths64& subjects)
{
AddPaths(subjects, PathType::Subject, false);
}
void AddOpenSubject(const Paths64& open_subjects)
{
AddPaths(open_subjects, PathType::Subject, true);
}
void AddClip(const Paths64& clips)
{
AddPaths(clips, PathType::Clip, false);
}
bool Execute(ClipType clip_type,
FillRule fill_rule, Paths64& closed_paths)
{
Paths64 dummy;
return Execute(clip_type, fill_rule, closed_paths, dummy);
}
bool Execute(ClipType clip_type, FillRule fill_rule,
Paths64& closed_paths, Paths64& open_paths)
{
closed_paths.clear();
open_paths.clear();
if (ExecuteInternal(clip_type, fill_rule, false))
BuildPaths64(closed_paths, &open_paths);
CleanUp();
return succeeded_;
}
bool Execute(ClipType clip_type, FillRule fill_rule, PolyTree64& polytree)
{
Paths64 dummy;
return Execute(clip_type, fill_rule, polytree, dummy);
}
bool Execute(ClipType clip_type,
FillRule fill_rule, PolyTree64& polytree, Paths64& open_paths)
{
if (ExecuteInternal(clip_type, fill_rule, true))
{
open_paths.clear();
polytree.Clear();
BuildTree64(polytree, open_paths);
}
CleanUp();
return succeeded_;
}
};
class ClipperD : public ClipperBase {
private:
double scale_ = 1.0, invScale_ = 1.0;
#ifdef USINGZ
ZCallbackD zCallbackD_ = nullptr;
#endif
void BuildPathsD(PathsD& solutionClosed, PathsD* solutionOpen);
void BuildTreeD(PolyPathD& polytree, PathsD& open_paths);
public:
explicit ClipperD(int precision = 2) : ClipperBase()
{
CheckPrecisionRange(precision, error_code_);
// to optimize scaling / descaling precision
// set the scale to a power of double's radix (2) (#25)
scale_ = std::pow(std::numeric_limits<double>::radix,
std::ilogb(std::pow(10, precision)) + 1);
invScale_ = 1 / scale_;
}
#ifdef USINGZ
void SetZCallback(ZCallbackD cb) { zCallbackD_ = cb; };
void ZCB(const Point64& e1bot, const Point64& e1top,
const Point64& e2bot, const Point64& e2top, Point64& pt)
{
// de-scale (x & y)
// temporarily convert integers to their initial float values
// this will slow clipping marginally but will make it much easier
// to understand the coordinates passed to the callback function
PointD tmp = PointD(pt) * invScale_;
PointD e1b = PointD(e1bot) * invScale_;
PointD e1t = PointD(e1top) * invScale_;
PointD e2b = PointD(e2bot) * invScale_;
PointD e2t = PointD(e2top) * invScale_;
zCallbackD_(e1b,e1t, e2b, e2t, tmp);
pt.z = tmp.z; // only update 'z'
};
void CheckCallback()
{
if(zCallbackD_)
// if the user defined float point callback has been assigned
// then assign the proxy callback function
ClipperBase::zCallback_ =
std::bind(&ClipperD::ZCB, this, std::placeholders::_1,
std::placeholders::_2, std::placeholders::_3,
std::placeholders::_4, std::placeholders::_5);
else
ClipperBase::zCallback_ = nullptr;
}
#endif
void AddSubject(const PathsD& subjects)
{
AddPaths(ScalePaths<int64_t, double>(subjects, scale_, error_code_), PathType::Subject, false);
}
void AddOpenSubject(const PathsD& open_subjects)
{
AddPaths(ScalePaths<int64_t, double>(open_subjects, scale_, error_code_), PathType::Subject, true);
}
void AddClip(const PathsD& clips)
{
AddPaths(ScalePaths<int64_t, double>(clips, scale_, error_code_), PathType::Clip, false);
}
bool Execute(ClipType clip_type, FillRule fill_rule, PathsD& closed_paths)
{
PathsD dummy;
return Execute(clip_type, fill_rule, closed_paths, dummy);
}
bool Execute(ClipType clip_type,
FillRule fill_rule, PathsD& closed_paths, PathsD& open_paths)
{
#ifdef USINGZ
CheckCallback();
#endif
if (ExecuteInternal(clip_type, fill_rule, false))
{
BuildPathsD(closed_paths, &open_paths);
}
CleanUp();
return succeeded_;
}
bool Execute(ClipType clip_type, FillRule fill_rule, PolyTreeD& polytree)
{
PathsD dummy;
return Execute(clip_type, fill_rule, polytree, dummy);
}
bool Execute(ClipType clip_type,
FillRule fill_rule, PolyTreeD& polytree, PathsD& open_paths)
{
#ifdef USINGZ
CheckCallback();
#endif
if (ExecuteInternal(clip_type, fill_rule, true))
{
polytree.Clear();
polytree.SetScale(invScale_);
open_paths.clear();
BuildTreeD(polytree, open_paths);
}
CleanUp();
return succeeded_;
}
};
} // namespace
#endif // CLIPPER_ENGINE_H
clipper2/include/clipper2/clipper.export.h
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/*******************************************************************************
* Author : Angus Johnson *
* Date : 17 September 2024 *
* Website : http://www.angusj.com *
* Copyright : Angus Johnson 2010-2024 *
* Purpose : This module exports the Clipper2 Library (ie DLL/so) *
* License : http://www.boost.org/LICENSE_1_0.txt *
*******************************************************************************/
/*
Boolean clipping:
cliptype: NoClip=0, Intersection=1, Union=2, Difference=3, Xor=4
fillrule: EvenOdd=0, NonZero=1, Positive=2, Negative=3
Polygon offsetting (inflate/deflate):
jointype: Square=0, Bevel=1, Round=2, Miter=3
endtype: Polygon=0, Joined=1, Butt=2, Square=3, Round=4
The path structures used extensively in other parts of this library are all
based on std::vector classes. Since C++ classes can't be accessed by other
languages, these paths are converted here into very simple array data
structures that can be parsed by just about any programming language.
These 2D paths are defined by series of x and y coordinates together with an
optional user-defined 'z' value (see Z-values below). Hence, a vertex refers
to a single x and y coordinate (+/- a user-defined value). These values will
be either type int64_t or type double. Data structures have names that
indicate the array type by a suffixed '64' or a 'D'. For example, the data
structure CPath64 contains an array of int64_t values, whereas the data
structure CPathD contains an array of double. Where documentation omits
the type suffix (eg CPath), it is simply agnostic to the array's data type.
For conciseness, the following letters are used in the diagrams below:
N: Number of vertices in a given path
C: Count of structure's paths
A: Array size (as distinct from the size in memory)
CPath64 and CPathD:
These are arrays of consecutive vertices preceeded by a pair of values
containing the number of vertices (N) in the path, and a 0 value.
_______________________________________________________________
| counters | vertex1 | vertex2 | ... | vertexN |
| N, 0 | x1, y1, (z1) | x2, y2, (z2) | ... | xN, yN, (zN) |
---------------------------------------------------------------
CPaths64 and CPathsD:
These are also arrays containing any number of consecutive CPath
structures. Preceeding these consecutive paths, there is a pair of
values that contain the length of the array structure (A) and
the count of following CPath structures (C).
Memory allocation for CPaths64 = A * sizeof(int64_t)
Memory allocation for CPathsD = A * sizeof(double)
__________________________________________
| counters | path1 | path2 | ... | pathC |
| A, C | | | ... | |
------------------------------------------
CPolytree64 and CPolytreeD:
These structures consist of two values followed by a series of CPolyPath
structures. The first value indicates the total length of the array (A).
The second value indicates the number of following CPolyPath structures
that are the top level CPolyPath in the CPolytree (C). These CPolyPath
may, in turn, contain their own nested CPolyPath children that
collectively make a tree structure.
_________________________________________________________
| counters | CPolyPath1 | CPolyPath2 | ... | CPolyPathC |
| A, C | | | ... | |
---------------------------------------------------------
CPolyPath64 and CPolyPathD:
These array structures consist of a pair of counter values followed by a
series of polygon vertices and a series of nested CPolyPath children.
The first counter values indicates the number of vertices in the
polygon (N), and the second counter indicates the CPolyPath child count (C).
_____________________________________________________________________________
|cntrs |vertex1 |vertex2 |...|vertexN |child1|child2|...|childC|
|N, C |x1, y1, (z1)| x2, y2, (z2)|...|xN, yN, (zN)| | |...| |
-----------------------------------------------------------------------------
DisposeArray64 & DisposeArrayD:
All array structures are allocated in heap memory which will eventually
need to be released. However, since applications linking to these DLL
functions may use different memory managers, the only safe way to release
this memory is to use the exported DisposeArray functions.
(Optional) Z-Values:
Structures will only contain user-defined z-values when the USINGZ
pre-processor identifier is used. The library does not assign z-values
because this field is intended for users to assign custom values to vertices.
Z-values in input paths (subject and clip) will be copied to solution paths.
New vertices at path intersections will generate a callback event that allows
users to assign z-values at these new vertices. The user's callback function
must conform with the DLLZCallback definition and be registered with the
DLL via SetZCallback. To assist the user in assigning z-values, the library
passes in the callback function the new intersection point together with
the four vertices that define the two segments that are intersecting.
*/
#ifndef CLIPPER2_EXPORT_H
#define CLIPPER2_EXPORT_H
#include <cstdlib>
#include <vector>
#include "clipper2/clipper.core.h"
#include "clipper2/clipper.engine.h"
#include "clipper2/clipper.offset.h"
#include "clipper2/clipper.rectclip.h"
namespace Clipper2Lib {
typedef int64_t* CPath64;
typedef int64_t* CPaths64;
typedef double* CPathD;
typedef double* CPathsD;
typedef int64_t* CPolyPath64;
typedef int64_t* CPolyTree64;
typedef double* CPolyPathD;
typedef double* CPolyTreeD;
template <typename T>
struct CRect {
T left;
T top;
T right;
T bottom;
};
typedef CRect<int64_t> CRect64;
typedef CRect<double> CRectD;
template <typename T>
inline bool CRectIsEmpty(const CRect<T>& rect)
{
return (rect.right <= rect.left) || (rect.bottom <= rect.top);
}
template <typename T>
inline Rect<T> CRectToRect(const CRect<T>& rect)
{
Rect<T> result;
result.left = rect.left;
result.top = rect.top;
result.right = rect.right;
result.bottom = rect.bottom;
return result;
}
template <typename T1, typename T2>
inline T1 Reinterpret(T2 value) {
return *reinterpret_cast<T1*>(&value);
}
#ifdef _WIN32
#define EXTERN_DLL_EXPORT extern "C" __declspec(dllexport)
#else
#define EXTERN_DLL_EXPORT extern "C"
#endif
//////////////////////////////////////////////////////
// EXPORTED FUNCTION DECLARATIONS
//////////////////////////////////////////////////////
EXTERN_DLL_EXPORT const char* Version();
EXTERN_DLL_EXPORT void DisposeArray64(int64_t*& p)
{
delete[] p;
}
EXTERN_DLL_EXPORT void DisposeArrayD(double*& p)
{
delete[] p;
}
EXTERN_DLL_EXPORT int BooleanOp64(uint8_t cliptype,
uint8_t fillrule, const CPaths64 subjects,
const CPaths64 subjects_open, const CPaths64 clips,
CPaths64& solution, CPaths64& solution_open,
bool preserve_collinear = true, bool reverse_solution = false);
EXTERN_DLL_EXPORT int BooleanOp_PolyTree64(uint8_t cliptype,
uint8_t fillrule, const CPaths64 subjects,
const CPaths64 subjects_open, const CPaths64 clips,
CPolyTree64& sol_tree, CPaths64& solution_open,
bool preserve_collinear = true, bool reverse_solution = false);
EXTERN_DLL_EXPORT int BooleanOpD(uint8_t cliptype,
uint8_t fillrule, const CPathsD subjects,
const CPathsD subjects_open, const CPathsD clips,
CPathsD& solution, CPathsD& solution_open, int precision = 2,
bool preserve_collinear = true, bool reverse_solution = false);
EXTERN_DLL_EXPORT int BooleanOp_PolyTreeD(uint8_t cliptype,
uint8_t fillrule, const CPathsD subjects,
const CPathsD subjects_open, const CPathsD clips,
CPolyTreeD& solution, CPathsD& solution_open, int precision = 2,
bool preserve_collinear = true, bool reverse_solution = false);
EXTERN_DLL_EXPORT CPaths64 InflatePaths64(const CPaths64 paths,
double delta, uint8_t jointype, uint8_t endtype,
double miter_limit = 2.0, double arc_tolerance = 0.0,
bool reverse_solution = false);
EXTERN_DLL_EXPORT CPathsD InflatePathsD(const CPathsD paths,
double delta, uint8_t jointype, uint8_t endtype,
int precision = 2, double miter_limit = 2.0,
double arc_tolerance = 0.0, bool reverse_solution = false);
EXTERN_DLL_EXPORT CPaths64 InflatePath64(const CPath64 path,
double delta, uint8_t jointype, uint8_t endtype,
double miter_limit = 2.0, double arc_tolerance = 0.0,
bool reverse_solution = false);
EXTERN_DLL_EXPORT CPathsD InflatePathD(const CPathD path,
double delta, uint8_t jointype, uint8_t endtype,
int precision = 2, double miter_limit = 2.0,
double arc_tolerance = 0.0, bool reverse_solution = false);
// RectClip & RectClipLines:
EXTERN_DLL_EXPORT CPaths64 RectClip64(const CRect64& rect,
const CPaths64 paths);
EXTERN_DLL_EXPORT CPathsD RectClipD(const CRectD& rect,
const CPathsD paths, int precision = 2);
EXTERN_DLL_EXPORT CPaths64 RectClipLines64(const CRect64& rect,
const CPaths64 paths);
EXTERN_DLL_EXPORT CPathsD RectClipLinesD(const CRectD& rect,
const CPathsD paths, int precision = 2);
//////////////////////////////////////////////////////
// INTERNAL FUNCTIONS
//////////////////////////////////////////////////////
#ifdef USINGZ
ZCallback64 dllCallback64 = nullptr;
ZCallbackD dllCallbackD = nullptr;
constexpr int EXPORT_VERTEX_DIMENSIONALITY = 3;
#else
constexpr int EXPORT_VERTEX_DIMENSIONALITY = 2;
#endif
template <typename T>
static void GetPathCountAndCPathsArrayLen(const Paths<T>& paths,
size_t& cnt, size_t& array_len)
{
array_len = 2;
cnt = 0;
for (const Path<T>& path : paths)
if (path.size())
{
array_len += path.size() * EXPORT_VERTEX_DIMENSIONALITY + 2;
++cnt;
}
}
static size_t GetPolyPathArrayLen64(const PolyPath64& pp)
{
size_t result = 2; // poly_length + child_count
result += pp.Polygon().size() * EXPORT_VERTEX_DIMENSIONALITY;
//plus nested children :)
for (size_t i = 0; i < pp.Count(); ++i)
result += GetPolyPathArrayLen64(*pp[i]);
return result;
}
static size_t GetPolyPathArrayLenD(const PolyPathD& pp)
{
size_t result = 2; // poly_length + child_count
result += pp.Polygon().size() * EXPORT_VERTEX_DIMENSIONALITY;
//plus nested children :)
for (size_t i = 0; i < pp.Count(); ++i)
result += GetPolyPathArrayLenD(*pp[i]);
return result;
}
static void GetPolytreeCountAndCStorageSize64(const PolyTree64& tree,
size_t& cnt, size_t& array_len)
{
cnt = tree.Count(); // nb: top level count only
array_len = GetPolyPathArrayLen64(tree);
}
static void GetPolytreeCountAndCStorageSizeD(const PolyTreeD& tree,
size_t& cnt, size_t& array_len)
{
cnt = tree.Count(); // nb: top level count only
array_len = GetPolyPathArrayLenD(tree);
}
template <typename T>
static T* CreateCPathsFromPathsT(const Paths<T>& paths)
{
size_t cnt = 0, array_len = 0;
GetPathCountAndCPathsArrayLen(paths, cnt, array_len);
T* result = new T[array_len], * v = result;
*v++ = array_len;
*v++ = cnt;
for (const Path<T>& path : paths)
{
if (!path.size()) continue;
*v++ = path.size();
*v++ = 0;
for (const Point<T>& pt : path)
{
*v++ = pt.x;
*v++ = pt.y;
#ifdef USINGZ
*v++ = Reinterpret<T>(pt.z);
#endif
}
}
return result;
}
CPathsD CreateCPathsDFromPathsD(const PathsD& paths)
{
if (!paths.size()) return nullptr;
size_t cnt, array_len;
GetPathCountAndCPathsArrayLen(paths, cnt, array_len);
CPathsD result = new double[array_len], v = result;
*v++ = (double)array_len;
*v++ = (double)cnt;
for (const PathD& path : paths)
{
if (!path.size()) continue;
*v = (double)path.size();
++v; *v++ = 0;
for (const PointD& pt : path)
{
*v++ = pt.x;
*v++ = pt.y;
#ifdef USINGZ
* v++ = Reinterpret<double>(pt.z);
#endif
}
}
return result;
}
CPathsD CreateCPathsDFromPaths64(const Paths64& paths, double scale)
{
if (!paths.size()) return nullptr;
size_t cnt, array_len;
GetPathCountAndCPathsArrayLen(paths, cnt, array_len);
CPathsD result = new double[array_len], v = result;
*v++ = (double)array_len;
*v++ = (double)cnt;
for (const Path64& path : paths)
{
if (!path.size()) continue;
*v = (double)path.size();
++v; *v++ = 0;
for (const Point64& pt : path)
{
*v++ = pt.x * scale;
*v++ = pt.y * scale;
#ifdef USINGZ
*v++ = Reinterpret<double>(pt.z);
#endif
}
}
return result;
}
template <typename T>
static Path<T> ConvertCPathToPathT(T* path)
{
Path<T> result;
if (!path) return result;
T* v = path;
size_t cnt = static_cast<size_t>(*v);
v += 2; // skip 0 value
result.reserve(cnt);
for (size_t j = 0; j < cnt; ++j)
{
T x = *v++, y = *v++;
#ifdef USINGZ
z_type z = Reinterpret<z_type>(*v++);
result.push_back(Point<T>(x, y, z));
#else
result.push_back(Point<T>(x, y));
#endif
}
return result;
}
template <typename T>
static Paths<T> ConvertCPathsToPathsT(T* paths)
{
Paths<T> result;
if (!paths) return result;
T* v = paths; ++v;
size_t cnt = static_cast<size_t>(*v++);
result.reserve(cnt);
for (size_t i = 0; i < cnt; ++i)
{
size_t cnt2 = static_cast<size_t>(*v);
v += 2;
Path<T> path;
path.reserve(cnt2);
for (size_t j = 0; j < cnt2; ++j)
{
T x = *v++, y = *v++;
#ifdef USINGZ
z_type z = Reinterpret<z_type>(*v++);
path.push_back(Point<T>(x, y, z));
#else
path.push_back(Point<T>(x, y));
#endif
}
result.push_back(path);
}
return result;
}
static Path64 ConvertCPathDToPath64WithScale(const CPathD path, double scale)
{
Path64 result;
if (!path) return result;
double* v = path;
size_t cnt = static_cast<size_t>(*v);
v += 2; // skip 0 value
result.reserve(cnt);
for (size_t j = 0; j < cnt; ++j)
{
double x = *v++ * scale;
double y = *v++ * scale;
#ifdef USINGZ
z_type z = Reinterpret<z_type>(*v++);
result.push_back(Point64(x, y, z));
#else
result.push_back(Point64(x, y));
#endif
}
return result;
}
static Paths64 ConvertCPathsDToPaths64(const CPathsD paths, double scale)
{
Paths64 result;
if (!paths) return result;
double* v = paths;
++v; // skip the first value (0)
size_t cnt = static_cast<size_t>(*v++);
result.reserve(cnt);
for (size_t i = 0; i < cnt; ++i)
{
size_t cnt2 = static_cast<size_t>(*v);
v += 2;
Path64 path;
path.reserve(cnt2);
for (size_t j = 0; j < cnt2; ++j)
{
double x = *v++ * scale;
double y = *v++ * scale;
#ifdef USINGZ
z_type z = Reinterpret<z_type>(*v++);
path.push_back(Point64(x, y, z));
#else
path.push_back(Point64(x, y));
#endif
}
result.push_back(path);
}
return result;
}
static void CreateCPolyPath64(const PolyPath64* pp, int64_t*& v)
{
*v++ = static_cast<int64_t>(pp->Polygon().size());
*v++ = static_cast<int64_t>(pp->Count());
for (const Point64& pt : pp->Polygon())
{
*v++ = pt.x;
*v++ = pt.y;
#ifdef USINGZ
* v++ = Reinterpret<int64_t>(pt.z); // raw memory copy
#endif
}
for (size_t i = 0; i < pp->Count(); ++i)
CreateCPolyPath64(pp->Child(i), v);
}
static void CreateCPolyPathD(const PolyPathD* pp, double*& v)
{
*v++ = static_cast<double>(pp->Polygon().size());
*v++ = static_cast<double>(pp->Count());
for (const PointD& pt : pp->Polygon())
{
*v++ = pt.x;
*v++ = pt.y;
#ifdef USINGZ
* v++ = Reinterpret<double>(pt.z); // raw memory copy
#endif
}
for (size_t i = 0; i < pp->Count(); ++i)
CreateCPolyPathD(pp->Child(i), v);
}
static int64_t* CreateCPolyTree64(const PolyTree64& tree)
{
size_t cnt, array_len;
GetPolytreeCountAndCStorageSize64(tree, cnt, array_len);
if (!cnt) return nullptr;
// allocate storage
int64_t* result = new int64_t[array_len];
int64_t* v = result;
*v++ = static_cast<int64_t>(array_len);
*v++ = static_cast<int64_t>(tree.Count());
for (size_t i = 0; i < tree.Count(); ++i)
CreateCPolyPath64(tree.Child(i), v);
return result;
}
static double* CreateCPolyTreeD(const PolyTreeD& tree)
{
double scale = std::log10(tree.Scale());
size_t cnt, array_len;
GetPolytreeCountAndCStorageSizeD(tree, cnt, array_len);
if (!cnt) return nullptr;
// allocate storage
double* result = new double[array_len];
double* v = result;
*v++ = static_cast<double>(array_len);
*v++ = static_cast<double>(tree.Count());
for (size_t i = 0; i < tree.Count(); ++i)
CreateCPolyPathD(tree.Child(i), v);
return result;
}
//////////////////////////////////////////////////////
// EXPORTED FUNCTION DEFINITIONS
//////////////////////////////////////////////////////
EXTERN_DLL_EXPORT const char* Version()
{
return CLIPPER2_VERSION;
}
EXTERN_DLL_EXPORT int BooleanOp64(uint8_t cliptype,
uint8_t fillrule, const CPaths64 subjects,
const CPaths64 subjects_open, const CPaths64 clips,
CPaths64& solution, CPaths64& solution_open,
bool preserve_collinear, bool reverse_solution)
{
if (cliptype > static_cast<uint8_t>(ClipType::Xor)) return -4;
if (fillrule > static_cast<uint8_t>(FillRule::Negative)) return -3;
Paths64 sub, sub_open, clp, sol, sol_open;
sub = ConvertCPathsToPathsT(subjects);
sub_open = ConvertCPathsToPathsT(subjects_open);
clp = ConvertCPathsToPathsT(clips);
Clipper64 clipper;
clipper.PreserveCollinear(preserve_collinear);
clipper.ReverseSolution(reverse_solution);
#ifdef USINGZ
if (dllCallback64)
clipper.SetZCallback(dllCallback64);
#endif
if (sub.size() > 0) clipper.AddSubject(sub);
if (sub_open.size() > 0) clipper.AddOpenSubject(sub_open);
if (clp.size() > 0) clipper.AddClip(clp);
if (!clipper.Execute(ClipType(cliptype), FillRule(fillrule), sol, sol_open))
return -1; // clipping bug - should never happen :)
solution = CreateCPathsFromPathsT(sol);
solution_open = CreateCPathsFromPathsT(sol_open);
return 0; //success !!
}
EXTERN_DLL_EXPORT int BooleanOp_PolyTree64(uint8_t cliptype,
uint8_t fillrule, const CPaths64 subjects,
const CPaths64 subjects_open, const CPaths64 clips,
CPolyTree64& sol_tree, CPaths64& solution_open,
bool preserve_collinear, bool reverse_solution)
{
if (cliptype > static_cast<uint8_t>(ClipType::Xor)) return -4;
if (fillrule > static_cast<uint8_t>(FillRule::Negative)) return -3;
Paths64 sub, sub_open, clp, sol_open;
sub = ConvertCPathsToPathsT(subjects);
sub_open = ConvertCPathsToPathsT(subjects_open);
clp = ConvertCPathsToPathsT(clips);
PolyTree64 tree;
Clipper64 clipper;
clipper.PreserveCollinear(preserve_collinear);
clipper.ReverseSolution(reverse_solution);
#ifdef USINGZ
if (dllCallback64)
clipper.SetZCallback(dllCallback64);
#endif
if (sub.size() > 0) clipper.AddSubject(sub);
if (sub_open.size() > 0) clipper.AddOpenSubject(sub_open);
if (clp.size() > 0) clipper.AddClip(clp);
if (!clipper.Execute(ClipType(cliptype), FillRule(fillrule), tree, sol_open))
return -1; // clipping bug - should never happen :)
sol_tree = CreateCPolyTree64(tree);
solution_open = CreateCPathsFromPathsT(sol_open);
return 0; //success !!
}
EXTERN_DLL_EXPORT int BooleanOpD(uint8_t cliptype,
uint8_t fillrule, const CPathsD subjects,
const CPathsD subjects_open, const CPathsD clips,
CPathsD& solution, CPathsD& solution_open, int precision,
bool preserve_collinear, bool reverse_solution)
{
if (precision < -8 || precision > 8) return -5;
if (cliptype > static_cast<uint8_t>(ClipType::Xor)) return -4;
if (fillrule > static_cast<uint8_t>(FillRule::Negative)) return -3;
//const double scale = std::pow(10, precision);
PathsD sub, sub_open, clp, sol, sol_open;
sub = ConvertCPathsToPathsT(subjects);
sub_open = ConvertCPathsToPathsT(subjects_open);
clp = ConvertCPathsToPathsT(clips);
ClipperD clipper(precision);
clipper.PreserveCollinear(preserve_collinear);
clipper.ReverseSolution(reverse_solution);
#ifdef USINGZ
if (dllCallbackD)
clipper.SetZCallback(dllCallbackD);
#endif
if (sub.size() > 0) clipper.AddSubject(sub);
if (sub_open.size() > 0) clipper.AddOpenSubject(sub_open);
if (clp.size() > 0) clipper.AddClip(clp);
if (!clipper.Execute(ClipType(cliptype),
FillRule(fillrule), sol, sol_open)) return -1;
solution = CreateCPathsDFromPathsD(sol);
solution_open = CreateCPathsDFromPathsD(sol_open);
return 0;
}
EXTERN_DLL_EXPORT int BooleanOp_PolyTreeD(uint8_t cliptype,
uint8_t fillrule, const CPathsD subjects,
const CPathsD subjects_open, const CPathsD clips,
CPolyTreeD& solution, CPathsD& solution_open, int precision,
bool preserve_collinear, bool reverse_solution)
{
if (precision < -8 || precision > 8) return -5;
if (cliptype > static_cast<uint8_t>(ClipType::Xor)) return -4;
if (fillrule > static_cast<uint8_t>(FillRule::Negative)) return -3;
//double scale = std::pow(10, precision);
int err = 0;
PathsD sub, sub_open, clp, sol_open;
sub = ConvertCPathsToPathsT(subjects);
sub_open = ConvertCPathsToPathsT(subjects_open);
clp = ConvertCPathsToPathsT(clips);
PolyTreeD tree;
ClipperD clipper(precision);
clipper.PreserveCollinear(preserve_collinear);
clipper.ReverseSolution(reverse_solution);
#ifdef USINGZ
if (dllCallbackD)
clipper.SetZCallback(dllCallbackD);
#endif
if (sub.size() > 0) clipper.AddSubject(sub);
if (sub_open.size() > 0) clipper.AddOpenSubject(sub_open);
if (clp.size() > 0) clipper.AddClip(clp);
if (!clipper.Execute(ClipType(cliptype), FillRule(fillrule), tree, sol_open))
return -1; // clipping bug - should never happen :)
solution = CreateCPolyTreeD(tree);
solution_open = CreateCPathsDFromPathsD(sol_open);
return 0; //success !!
}
EXTERN_DLL_EXPORT CPaths64 InflatePaths64(const CPaths64 paths,
double delta, uint8_t jointype, uint8_t endtype, double miter_limit,
double arc_tolerance, bool reverse_solution)
{
Paths64 pp;
pp = ConvertCPathsToPathsT(paths);
ClipperOffset clip_offset( miter_limit,
arc_tolerance, reverse_solution);
clip_offset.AddPaths(pp, JoinType(jointype), EndType(endtype));
Paths64 result;
clip_offset.Execute(delta, result);
return CreateCPathsFromPathsT(result);
}
EXTERN_DLL_EXPORT CPathsD InflatePathsD(const CPathsD paths,
double delta, uint8_t jointype, uint8_t endtype,
int precision, double miter_limit,
double arc_tolerance, bool reverse_solution)
{
if (precision < -8 || precision > 8 || !paths) return nullptr;
const double scale = std::pow(10, precision);
ClipperOffset clip_offset(miter_limit, arc_tolerance, reverse_solution);
Paths64 pp = ConvertCPathsDToPaths64(paths, scale);
clip_offset.AddPaths(pp, JoinType(jointype), EndType(endtype));
Paths64 result;
clip_offset.Execute(delta * scale, result);
return CreateCPathsDFromPaths64(result, 1 / scale);
}
EXTERN_DLL_EXPORT CPaths64 InflatePath64(const CPath64 path,
double delta, uint8_t jointype, uint8_t endtype, double miter_limit,
double arc_tolerance, bool reverse_solution)
{
Path64 pp;
pp = ConvertCPathToPathT(path);
ClipperOffset clip_offset(miter_limit,
arc_tolerance, reverse_solution);
clip_offset.AddPath(pp, JoinType(jointype), EndType(endtype));
Paths64 result;
clip_offset.Execute(delta, result);
return CreateCPathsFromPathsT(result);
}
EXTERN_DLL_EXPORT CPathsD InflatePathD(const CPathD path,
double delta, uint8_t jointype, uint8_t endtype,
int precision, double miter_limit,
double arc_tolerance, bool reverse_solution)
{
if (precision < -8 || precision > 8 || !path) return nullptr;
const double scale = std::pow(10, precision);
ClipperOffset clip_offset(miter_limit, arc_tolerance, reverse_solution);
Path64 pp = ConvertCPathDToPath64WithScale(path, scale);
clip_offset.AddPath(pp, JoinType(jointype), EndType(endtype));
Paths64 result;
clip_offset.Execute(delta * scale, result);
return CreateCPathsDFromPaths64(result, 1 / scale);
}
EXTERN_DLL_EXPORT CPaths64 RectClip64(const CRect64& rect, const CPaths64 paths)
{
if (CRectIsEmpty(rect) || !paths) return nullptr;
Rect64 r64 = CRectToRect(rect);
class RectClip64 rc(r64);
Paths64 pp = ConvertCPathsToPathsT(paths);
Paths64 result = rc.Execute(pp);
return CreateCPathsFromPathsT(result);
}
EXTERN_DLL_EXPORT CPathsD RectClipD(const CRectD& rect, const CPathsD paths, int precision)
{
if (CRectIsEmpty(rect) || !paths) return nullptr;
if (precision < -8 || precision > 8) return nullptr;
const double scale = std::pow(10, precision);
RectD r = CRectToRect(rect);
Rect64 rec = ScaleRect<int64_t, double>(r, scale);
Paths64 pp = ConvertCPathsDToPaths64(paths, scale);
class RectClip64 rc(rec);
Paths64 result = rc.Execute(pp);
return CreateCPathsDFromPaths64(result, 1 / scale);
}
EXTERN_DLL_EXPORT CPaths64 RectClipLines64(const CRect64& rect,
const CPaths64 paths)
{
if (CRectIsEmpty(rect) || !paths) return nullptr;
Rect64 r = CRectToRect(rect);
class RectClipLines64 rcl (r);
Paths64 pp = ConvertCPathsToPathsT(paths);
Paths64 result = rcl.Execute(pp);
return CreateCPathsFromPathsT(result);
}
EXTERN_DLL_EXPORT CPathsD RectClipLinesD(const CRectD& rect,
const CPathsD paths, int precision)
{
if (CRectIsEmpty(rect) || !paths) return nullptr;
if (precision < -8 || precision > 8) return nullptr;
const double scale = std::pow(10, precision);
Rect64 r = ScaleRect<int64_t, double>(CRectToRect(rect), scale);
class RectClipLines64 rcl(r);
Paths64 pp = ConvertCPathsDToPaths64(paths, scale);
Paths64 result = rcl.Execute(pp);
return CreateCPathsDFromPaths64(result, 1 / scale);
}
EXTERN_DLL_EXPORT CPaths64 MinkowskiSum64(const CPath64& cpattern, const CPath64& cpath, bool is_closed)
{
Path64 path = ConvertCPathToPathT(cpath);
Path64 pattern = ConvertCPathToPathT(cpattern);
Paths64 solution = MinkowskiSum(pattern, path, is_closed);
return CreateCPathsFromPathsT(solution);
}
EXTERN_DLL_EXPORT CPaths64 MinkowskiDiff64(const CPath64& cpattern, const CPath64& cpath, bool is_closed)
{
Path64 path = ConvertCPathToPathT(cpath);
Path64 pattern = ConvertCPathToPathT(cpattern);
Paths64 solution = MinkowskiDiff(pattern, path, is_closed);
return CreateCPathsFromPathsT(solution);
}
#ifdef USINGZ
typedef void (*DLLZCallback64)(const Point64& e1bot, const Point64& e1top, const Point64& e2bot, const Point64& e2top, Point64& pt);
typedef void (*DLLZCallbackD)(const PointD& e1bot, const PointD& e1top, const PointD& e2bot, const PointD& e2top, PointD& pt);
EXTERN_DLL_EXPORT void SetZCallback64(DLLZCallback64 callback)
{
dllCallback64 = callback;
}
EXTERN_DLL_EXPORT void SetZCallbackD(DLLZCallbackD callback)
{
dllCallbackD = callback;
}
#endif
}
#endif // CLIPPER2_EXPORT_H
clipper2/include/clipper2/clipper.h
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/*******************************************************************************
* Author : Angus Johnson *
* Date : 27 April 2024 *
* Website : http://www.angusj.com *
* Copyright : Angus Johnson 2010-2024 *
* Purpose : This module provides a simple interface to the Clipper Library *
* License : http://www.boost.org/LICENSE_1_0.txt *
*******************************************************************************/
#ifndef CLIPPER_H
#define CLIPPER_H
#include <cstdlib>
#include <type_traits>
#include <vector>
#include "clipper2/clipper.core.h"
#include "clipper2/clipper.engine.h"
namespace Clipper2Lib {
inline Paths64 BooleanOp(ClipType cliptype, FillRule fillrule,
const Paths64& subjects, const Paths64& clips)
{
Paths64 result;
Clipper64 clipper;
clipper.AddSubject(subjects);
clipper.AddClip(clips);
clipper.Execute(cliptype, fillrule, result);
return result;
}
inline void BooleanOp(ClipType cliptype, FillRule fillrule,
const Paths64& subjects, const Paths64& clips, PolyTree64& solution)
{
Paths64 sol_open;
Clipper64 clipper;
clipper.AddSubject(subjects);
clipper.AddClip(clips);
clipper.Execute(cliptype, fillrule, solution, sol_open);
}
inline PathsD BooleanOp(ClipType cliptype, FillRule fillrule,
const PathsD& subjects, const PathsD& clips, int precision = 2)
{
int error_code = 0;
CheckPrecisionRange(precision, error_code);
PathsD result;
if (error_code) return result;
ClipperD clipper(precision);
clipper.AddSubject(subjects);
clipper.AddClip(clips);
clipper.Execute(cliptype, fillrule, result);
return result;
}
inline void BooleanOp(ClipType cliptype, FillRule fillrule,
const PathsD& subjects, const PathsD& clips,
PolyTreeD& polytree, int precision = 2)
{
polytree.Clear();
int error_code = 0;
CheckPrecisionRange(precision, error_code);
if (error_code) return;
ClipperD clipper(precision);
clipper.AddSubject(subjects);
clipper.AddClip(clips);
clipper.Execute(cliptype, fillrule, polytree);
}
inline Paths64 Intersect(const Paths64& subjects, const Paths64& clips, FillRule fillrule)
{
return BooleanOp(ClipType::Intersection, fillrule, subjects, clips);
}
inline PathsD Intersect(const PathsD& subjects, const PathsD& clips, FillRule fillrule, int decimal_prec = 2)
{
return BooleanOp(ClipType::Intersection, fillrule, subjects, clips, decimal_prec);
}
inline Paths64 Union(const Paths64& subjects, const Paths64& clips, FillRule fillrule)
{
return BooleanOp(ClipType::Union, fillrule, subjects, clips);
}
inline PathsD Union(const PathsD& subjects, const PathsD& clips, FillRule fillrule, int decimal_prec = 2)
{
return BooleanOp(ClipType::Union, fillrule, subjects, clips, decimal_prec);
}
inline Paths64 Union(const Paths64& subjects, FillRule fillrule)
{
Paths64 result;
Clipper64 clipper;
clipper.AddSubject(subjects);
clipper.Execute(ClipType::Union, fillrule, result);
return result;
}
inline PathsD Union(const PathsD& subjects, FillRule fillrule, int precision = 2)
{
PathsD result;
int error_code = 0;
CheckPrecisionRange(precision, error_code);
if (error_code) return result;
ClipperD clipper(precision);
clipper.AddSubject(subjects);
clipper.Execute(ClipType::Union, fillrule, result);
return result;
}
inline Paths64 Difference(const Paths64& subjects, const Paths64& clips, FillRule fillrule)
{
return BooleanOp(ClipType::Difference, fillrule, subjects, clips);
}
inline PathsD Difference(const PathsD& subjects, const PathsD& clips, FillRule fillrule, int decimal_prec = 2)
{
return BooleanOp(ClipType::Difference, fillrule, subjects, clips, decimal_prec);
}
inline Paths64 Xor(const Paths64& subjects, const Paths64& clips, FillRule fillrule)
{
return BooleanOp(ClipType::Xor, fillrule, subjects, clips);
}
inline PathsD Xor(const PathsD& subjects, const PathsD& clips, FillRule fillrule, int decimal_prec = 2)
{
return BooleanOp(ClipType::Xor, fillrule, subjects, clips, decimal_prec);
}
template <typename T>
inline Path<T> TranslatePath(const Path<T>& path, T dx, T dy)
{
Path<T> result;
result.reserve(path.size());
std::transform(path.begin(), path.end(), back_inserter(result),
[dx, dy](const auto& pt) { return Point<T>(pt.x + dx, pt.y +dy); });
return result;
}
inline Path64 TranslatePath(const Path64& path, int64_t dx, int64_t dy)
{
return TranslatePath<int64_t>(path, dx, dy);
}
inline PathD TranslatePath(const PathD& path, double dx, double dy)
{
return TranslatePath<double>(path, dx, dy);
}
template <typename T>
inline Paths<T> TranslatePaths(const Paths<T>& paths, T dx, T dy)
{
Paths<T> result;
result.reserve(paths.size());
std::transform(paths.begin(), paths.end(), back_inserter(result),
[dx, dy](const auto& path) { return TranslatePath(path, dx, dy); });
return result;
}
inline Paths64 TranslatePaths(const Paths64& paths, int64_t dx, int64_t dy)
{
return TranslatePaths<int64_t>(paths, dx, dy);
}
inline PathsD TranslatePaths(const PathsD& paths, double dx, double dy)
{
return TranslatePaths<double>(paths, dx, dy);
}
namespace details
{
inline void PolyPathToPaths64(const PolyPath64& polypath, Paths64& paths)
{
paths.push_back(polypath.Polygon());
for (const auto& child : polypath)
PolyPathToPaths64(*child, paths);
}
inline void PolyPathToPathsD(const PolyPathD& polypath, PathsD& paths)
{
paths.push_back(polypath.Polygon());
for (const auto& child : polypath)
PolyPathToPathsD(*child, paths);
}
inline bool PolyPath64ContainsChildren(const PolyPath64& pp)
{
for (const auto& child : pp)
{
// return false if this child isn't fully contained by its parent
// checking for a single vertex outside is a bit too crude since
// it doesn't account for rounding errors. It's better to check
// for consecutive vertices found outside the parent's polygon.
int outsideCnt = 0;
for (const Point64& pt : child->Polygon())
{
PointInPolygonResult result = PointInPolygon(pt, pp.Polygon());
if (result == PointInPolygonResult::IsInside) --outsideCnt;
else if (result == PointInPolygonResult::IsOutside) ++outsideCnt;
if (outsideCnt > 1) return false;
else if (outsideCnt < -1) break;
}
// now check any nested children too
if (child->Count() > 0 && !PolyPath64ContainsChildren(*child))
return false;
}
return true;
}
static void OutlinePolyPath(std::ostream& os,
size_t idx, bool isHole, size_t count, const std::string& preamble)
{
std::string plural = (count == 1) ? "." : "s.";
if (isHole)
os << preamble << "+- Hole (" << idx << ") contains " << count <<
" nested polygon" << plural << std::endl;
else
os << preamble << "+- Polygon (" << idx << ") contains " << count <<
" hole" << plural << std::endl;
}
static void OutlinePolyPath64(std::ostream& os, const PolyPath64& pp,
size_t idx, std::string preamble)
{
OutlinePolyPath(os, idx, pp.IsHole(), pp.Count(), preamble);
for (size_t i = 0; i < pp.Count(); ++i)
if (pp.Child(i)->Count())
details::OutlinePolyPath64(os, *pp.Child(i), i, preamble + " ");
}
static void OutlinePolyPathD(std::ostream& os, const PolyPathD& pp,
size_t idx, std::string preamble)
{
OutlinePolyPath(os, idx, pp.IsHole(), pp.Count(), preamble);
for (size_t i = 0; i < pp.Count(); ++i)
if (pp.Child(i)->Count())
details::OutlinePolyPathD(os, *pp.Child(i), i, preamble + " ");
}
template<typename T, typename U>
inline constexpr void MakePathGeneric(const T an_array,
size_t array_size, std::vector<U>& result)
{
result.reserve(array_size / 2);
for (size_t i = 0; i < array_size; i +=2)
#ifdef USINGZ
result.push_back( U{ an_array[i], an_array[i + 1], 0} );
#else
result.push_back( U{ an_array[i], an_array[i + 1]} );
#endif
}
} // end details namespace
inline std::ostream& operator<< (std::ostream& os, const PolyTree64& pp)
{
std::string plural = (pp.Count() == 1) ? " polygon." : " polygons.";
os << std::endl << "Polytree with " << pp.Count() << plural << std::endl;
for (size_t i = 0; i < pp.Count(); ++i)
if (pp.Child(i)->Count())
details::OutlinePolyPath64(os, *pp.Child(i), i, " ");
os << std::endl << std::endl;
return os;
}
inline std::ostream& operator<< (std::ostream& os, const PolyTreeD& pp)
{
std::string plural = (pp.Count() == 1) ? " polygon." : " polygons.";
os << std::endl << "Polytree with " << pp.Count() << plural << std::endl;
for (size_t i = 0; i < pp.Count(); ++i)
if (pp.Child(i)->Count())
details::OutlinePolyPathD(os, *pp.Child(i), i, " ");
os << std::endl << std::endl;
if (!pp.Level()) os << std::endl;
return os;
}
inline Paths64 PolyTreeToPaths64(const PolyTree64& polytree)
{
Paths64 result;
for (const auto& child : polytree)
details::PolyPathToPaths64(*child, result);
return result;
}
inline PathsD PolyTreeToPathsD(const PolyTreeD& polytree)
{
PathsD result;
for (const auto& child : polytree)
details::PolyPathToPathsD(*child, result);
return result;
}
inline bool CheckPolytreeFullyContainsChildren(const PolyTree64& polytree)
{
for (const auto& child : polytree)
if (child->Count() > 0 &&
!details::PolyPath64ContainsChildren(*child))
return false;
return true;
}
template<typename T,
typename std::enable_if<
std::is_integral<T>::value &&
!std::is_same<char, T>::value, bool
>::type = true>
inline Path64 MakePath(const std::vector<T>& list)
{
const auto size = list.size() - list.size() % 2;
if (list.size() != size)
DoError(non_pair_error_i); // non-fatal without exception handling
Path64 result;
details::MakePathGeneric(list, size, result);
return result;
}
template<typename T, std::size_t N,
typename std::enable_if<
std::is_integral<T>::value &&
!std::is_same<char, T>::value, bool
>::type = true>
inline Path64 MakePath(const T(&list)[N])
{
// Make the compiler error on unpaired value (i.e. no runtime effects).
static_assert(N % 2 == 0, "MakePath requires an even number of arguments");
Path64 result;
details::MakePathGeneric(list, N, result);
return result;
}
template<typename T,
typename std::enable_if<
std::is_arithmetic<T>::value &&
!std::is_same<char, T>::value, bool
>::type = true>
inline PathD MakePathD(const std::vector<T>& list)
{
const auto size = list.size() - list.size() % 2;
if (list.size() != size)
DoError(non_pair_error_i); // non-fatal without exception handling
PathD result;
details::MakePathGeneric(list, size, result);
return result;
}
template<typename T, std::size_t N,
typename std::enable_if<
std::is_arithmetic<T>::value &&
!std::is_same<char, T>::value, bool
>::type = true>
inline PathD MakePathD(const T(&list)[N])
{
// Make the compiler error on unpaired value (i.e. no runtime effects).
static_assert(N % 2 == 0, "MakePath requires an even number of arguments");
PathD result;
details::MakePathGeneric(list, N, result);
return result;
}
#ifdef USINGZ
template<typename T2, std::size_t N>
inline Path64 MakePathZ(const T2(&list)[N])
{
static_assert(N % 3 == 0 && std::numeric_limits<T2>::is_integer,
"MakePathZ requires integer values in multiples of 3");
std::size_t size = N / 3;
Path64 result(size);
for (size_t i = 0; i < size; ++i)
result[i] = Point64(list[i * 3],
list[i * 3 + 1], list[i * 3 + 2]);
return result;
}
template<typename T2, std::size_t N>
inline PathD MakePathZD(const T2(&list)[N])
{
static_assert(N % 3 == 0,
"MakePathZD requires values in multiples of 3");
std::size_t size = N / 3;
PathD result(size);
if constexpr (std::numeric_limits<T2>::is_integer)
for (size_t i = 0; i < size; ++i)
result[i] = PointD(list[i * 3],
list[i * 3 + 1], list[i * 3 + 2]);
else
for (size_t i = 0; i < size; ++i)
result[i] = PointD(list[i * 3], list[i * 3 + 1],
static_cast<int64_t>(list[i * 3 + 2]));
return result;
}
#endif
inline Path64 TrimCollinear(const Path64& p, bool is_open_path = false)
{
size_t len = p.size();
if (len < 3)
{
if (!is_open_path || len < 2 || p[0] == p[1]) return Path64();
else return p;
}
Path64 dst;
dst.reserve(len);
Path64::const_iterator srcIt = p.cbegin(), prevIt, stop = p.cend() - 1;
if (!is_open_path)
{
while (srcIt != stop && IsCollinear(*stop, *srcIt, *(srcIt + 1)))
++srcIt;
while (srcIt != stop && IsCollinear(*(stop - 1), *stop, *srcIt))
--stop;
if (srcIt == stop) return Path64();
}
prevIt = srcIt++;
dst.push_back(*prevIt);
for (; srcIt != stop; ++srcIt)
{
if (!IsCollinear(*prevIt, *srcIt, *(srcIt + 1)))
{
prevIt = srcIt;
dst.push_back(*prevIt);
}
}
if (is_open_path)
dst.push_back(*srcIt);
else if (!IsCollinear(*prevIt, *stop, dst[0]))
dst.push_back(*stop);
else
{
while (dst.size() > 2 &&
IsCollinear(dst[dst.size() - 1], dst[dst.size() - 2], dst[0]))
dst.pop_back();
if (dst.size() < 3) return Path64();
}
return dst;
}
inline PathD TrimCollinear(const PathD& path, int precision, bool is_open_path = false)
{
int error_code = 0;
CheckPrecisionRange(precision, error_code);
if (error_code) return PathD();
const double scale = std::pow(10, precision);
Path64 p = ScalePath<int64_t, double>(path, scale, error_code);
if (error_code) return PathD();
p = TrimCollinear(p, is_open_path);
return ScalePath<double, int64_t>(p, 1/scale, error_code);
}
template <typename T>
inline double Distance(const Point<T> pt1, const Point<T> pt2)
{
return std::sqrt(DistanceSqr(pt1, pt2));
}
template <typename T>
inline double Length(const Path<T>& path, bool is_closed_path = false)
{
double result = 0.0;
if (path.size() < 2) return result;
auto it = path.cbegin(), stop = path.end() - 1;
for (; it != stop; ++it)
result += Distance(*it, *(it + 1));
if (is_closed_path)
result += Distance(*stop, *path.cbegin());
return result;
}
template <typename T>
inline bool NearCollinear(const Point<T>& pt1, const Point<T>& pt2, const Point<T>& pt3, double sin_sqrd_min_angle_rads)
{
double cp = std::abs(CrossProduct(pt1, pt2, pt3));
return (cp * cp) / (DistanceSqr(pt1, pt2) * DistanceSqr(pt2, pt3)) < sin_sqrd_min_angle_rads;
}
template <typename T>
inline Path<T> Ellipse(const Rect<T>& rect, size_t steps = 0)
{
return Ellipse(rect.MidPoint(),
static_cast<double>(rect.Width()) *0.5,
static_cast<double>(rect.Height()) * 0.5, steps);
}
template <typename T>
inline Path<T> Ellipse(const Point<T>& center,
double radiusX, double radiusY = 0, size_t steps = 0)
{
if (radiusX <= 0) return Path<T>();
if (radiusY <= 0) radiusY = radiusX;
if (steps <= 2)
steps = static_cast<size_t>(PI * sqrt((radiusX + radiusY) / 2));
double si = std::sin(2 * PI / steps);
double co = std::cos(2 * PI / steps);
double dx = co, dy = si;
Path<T> result;
result.reserve(steps);
result.push_back(Point<T>(center.x + radiusX, static_cast<double>(center.y)));
for (size_t i = 1; i < steps; ++i)
{
result.push_back(Point<T>(center.x + radiusX * dx, center.y + radiusY * dy));
double x = dx * co - dy * si;
dy = dy * co + dx * si;
dx = x;
}
return result;
}
inline size_t GetNext(size_t current, size_t high,
const std::vector<bool>& flags)
{
++current;
while (current <= high && flags[current]) ++current;
if (current <= high) return current;
current = 0;
while (flags[current]) ++current;
return current;
}
inline size_t GetPrior(size_t current, size_t high,
const std::vector<bool>& flags)
{
if (current == 0) current = high;
else --current;
while (current > 0 && flags[current]) --current;
if (!flags[current]) return current;
current = high;
while (flags[current]) --current;
return current;
}
template <typename T>
inline Path<T> SimplifyPath(const Path<T> &path,
double epsilon, bool isClosedPath = true)
{
const size_t len = path.size(), high = len -1;
const double epsSqr = Sqr(epsilon);
if (len < 4) return Path<T>(path);
std::vector<bool> flags(len);
std::vector<double> distSqr(len);
size_t prior = high, curr = 0, start, next, prior2;
if (isClosedPath)
{
distSqr[0] = PerpendicDistFromLineSqrd(path[0], path[high], path[1]);
distSqr[high] = PerpendicDistFromLineSqrd(path[high], path[0], path[high - 1]);
}
else
{
distSqr[0] = MAX_DBL;
distSqr[high] = MAX_DBL;
}
for (size_t i = 1; i < high; ++i)
distSqr[i] = PerpendicDistFromLineSqrd(path[i], path[i - 1], path[i + 1]);
for (;;)
{
if (distSqr[curr] > epsSqr)
{
start = curr;
do
{
curr = GetNext(curr, high, flags);
} while (curr != start && distSqr[curr] > epsSqr);
if (curr == start) break;
}
prior = GetPrior(curr, high, flags);
next = GetNext(curr, high, flags);
if (next == prior) break;
// flag for removal the smaller of adjacent 'distances'
if (distSqr[next] < distSqr[curr])
{
prior2 = prior;
prior = curr;
curr = next;
next = GetNext(next, high, flags);
}
else
prior2 = GetPrior(prior, high, flags);
flags[curr] = true;
curr = next;
next = GetNext(next, high, flags);
if (isClosedPath || ((curr != high) && (curr != 0)))
distSqr[curr] = PerpendicDistFromLineSqrd(path[curr], path[prior], path[next]);
if (isClosedPath || ((prior != 0) && (prior != high)))
distSqr[prior] = PerpendicDistFromLineSqrd(path[prior], path[prior2], path[curr]);
}
Path<T> result;
result.reserve(len);
for (typename Path<T>::size_type i = 0; i < len; ++i)
if (!flags[i]) result.push_back(path[i]);
return result;
}
template <typename T>
inline Paths<T> SimplifyPaths(const Paths<T> &paths,
double epsilon, bool isClosedPath = true)
{
Paths<T> result;
result.reserve(paths.size());
for (const auto& path : paths)
result.push_back(SimplifyPath(path, epsilon, isClosedPath));
return result;
}
template <typename T>
inline void RDP(const Path<T> path, std::size_t begin,
std::size_t end, double epsSqrd, std::vector<bool>& flags)
{
typename Path<T>::size_type idx = 0;
double max_d = 0;
while (end > begin && path[begin] == path[end]) flags[end--] = false;
for (typename Path<T>::size_type i = begin + 1; i < end; ++i)
{
// PerpendicDistFromLineSqrd - avoids expensive Sqrt()
double d = PerpendicDistFromLineSqrd(path[i], path[begin], path[end]);
if (d <= max_d) continue;
max_d = d;
idx = i;
}
if (max_d <= epsSqrd) return;
flags[idx] = true;
if (idx > begin + 1) RDP(path, begin, idx, epsSqrd, flags);
if (idx < end - 1) RDP(path, idx, end, epsSqrd, flags);
}
template <typename T>
inline Path<T> RamerDouglasPeucker(const Path<T>& path, double epsilon)
{
const typename Path<T>::size_type len = path.size();
if (len < 5) return Path<T>(path);
std::vector<bool> flags(len);
flags[0] = true;
flags[len - 1] = true;
RDP(path, 0, len - 1, Sqr(epsilon), flags);
Path<T> result;
result.reserve(len);
for (typename Path<T>::size_type i = 0; i < len; ++i)
if (flags[i])
result.push_back(path[i]);
return result;
}
template <typename T>
inline Paths<T> RamerDouglasPeucker(const Paths<T>& paths, double epsilon)
{
Paths<T> result;
result.reserve(paths.size());
std::transform(paths.begin(), paths.end(), back_inserter(result),
[epsilon](const auto& path)
{ return RamerDouglasPeucker<T>(path, epsilon); });
return result;
}
} // end Clipper2Lib namespace
#endif // CLIPPER_H
clipper2/include/clipper2/clipper.version.h
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#ifndef CLIPPER_VERSION_H
#define CLIPPER_VERSION_H
constexpr auto CLIPPER2_VERSION = "1.4.0";
#endif // CLIPPER_VERSION_H
clipper2/src/clipper.engine.cpp
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