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Diffstat (limited to 'libs/assimp/contrib/clipper/clipper.cpp')
| -rw-r--r-- | libs/assimp/contrib/clipper/clipper.cpp | 3457 |
1 files changed, 0 insertions, 3457 deletions
diff --git a/libs/assimp/contrib/clipper/clipper.cpp b/libs/assimp/contrib/clipper/clipper.cpp deleted file mode 100644 index 857cd1c..0000000 --- a/libs/assimp/contrib/clipper/clipper.cpp +++ /dev/null @@ -1,3457 +0,0 @@ -/******************************************************************************* -* * -* Author : Angus Johnson * -* Version : 4.8.8 * -* Date : 30 August 2012 * -* Website : http://www.angusj.com * -* Copyright : Angus Johnson 2010-2012 * -* * -* License: * -* Use, modification & distribution is subject to Boost Software License Ver 1. * -* http://www.boost.org/LICENSE_1_0.txt * -* * -* Attributions: * -* The code in this library is an extension of Bala Vatti's clipping algorithm: * -* "A generic solution to polygon clipping" * -* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63. * -* http://portal.acm.org/citation.cfm?id=129906 * -* * -* Computer graphics and geometric modeling: implementation and algorithms * -* By Max K. Agoston * -* Springer; 1 edition (January 4, 2005) * -* http://books.google.com/books?q=vatti+clipping+agoston * -* * -* See also: * -* "Polygon Offsetting by Computing Winding Numbers" * -* Paper no. DETC2005-85513 pp. 565-575 * -* ASME 2005 International Design Engineering Technical Conferences * -* and Computers and Information in Engineering Conference (IDETC/CIE2005) * -* September 24-28, 2005 , Long Beach, California, USA * -* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf * -* * -*******************************************************************************/ - -/******************************************************************************* -* * -* This is a translation of the Delphi Clipper library and the naming style * -* used has retained a Delphi flavour. * -* * -*******************************************************************************/ - -#include "clipper.hpp" -#include <cmath> -#include <vector> -#include <algorithm> -#include <stdexcept> -#include <cassert> -#include <cstring> -#include <cstdlib> -#include <ostream> - -namespace ClipperLib { - -static long64 const loRange = 0x3FFFFFFF; -static long64 const hiRange = 0x3FFFFFFFFFFFFFFFLL; -static double const pi = 3.141592653589793238; -enum Direction { dRightToLeft, dLeftToRight }; - -#define HORIZONTAL (-1.0E+40) -#define TOLERANCE (1.0e-20) -#define NEAR_ZERO(val) (((val) > -TOLERANCE) && ((val) < TOLERANCE)) -#define NEAR_EQUAL(a, b) NEAR_ZERO((a) - (b)) - -inline long64 Abs(long64 val) -{ - return val < 0 ? -val : val; -} -//------------------------------------------------------------------------------ - -//------------------------------------------------------------------------------ -// Int128 class (enables safe math on signed 64bit integers) -// eg Int128 val1((long64)9223372036854775807); //ie 2^63 -1 -// Int128 val2((long64)9223372036854775807); -// Int128 val3 = val1 * val2; -// val3.AsString => "85070591730234615847396907784232501249" (8.5e+37) -//------------------------------------------------------------------------------ - -class Int128 -{ - public: - - Int128(long64 _lo = 0) - { - lo = _lo; - if (lo < 0) hi = -1; else hi = 0; - } - - Int128(const Int128 &val): hi(val.hi), lo(val.lo){} - - long64 operator = (const long64 &val) - { - lo = val; - if (lo < 0) hi = -1; else hi = 0; - return val; - } - - bool operator == (const Int128 &val) const - {return (hi == val.hi && lo == val.lo);} - - bool operator != (const Int128 &val) const - { return !(*this == val);} - - bool operator > (const Int128 &val) const - { - if (hi != val.hi) - return hi > val.hi; - else - return lo > val.lo; - } - - bool operator < (const Int128 &val) const - { - if (hi != val.hi) - return hi < val.hi; - else - return lo < val.lo; - } - - bool operator >= (const Int128 &val) const - { return !(*this < val);} - - bool operator <= (const Int128 &val) const - { return !(*this > val);} - - Int128& operator += (const Int128 &rhs) - { - hi += rhs.hi; - lo += rhs.lo; - if (ulong64(lo) < ulong64(rhs.lo)) hi++; - return *this; - } - - Int128 operator + (const Int128 &rhs) const - { - Int128 result(*this); - result+= rhs; - return result; - } - - Int128& operator -= (const Int128 &rhs) - { - Int128 tmp(rhs); - Negate(tmp); - *this += tmp; - return *this; - } - - //Int128 operator -() const - //{ - // Int128 result(*this); - // if (result.lo == 0) { - // if (result.hi != 0) result.hi = -1; - // } - // else { - // result.lo = -result.lo; - // result.hi = ~result.hi; - // } - // return result; - //} - - Int128 operator - (const Int128 &rhs) const - { - Int128 result(*this); - result -= rhs; - return result; - } - - Int128 operator * (const Int128 &rhs) const - { - if ( !(hi == 0 || hi == -1) || !(rhs.hi == 0 || rhs.hi == -1)) - throw "Int128 operator*: overflow error"; - bool negate = (hi < 0) != (rhs.hi < 0); - - Int128 tmp(*this); - if (tmp.hi < 0) Negate(tmp); - ulong64 int1Hi = ulong64(tmp.lo) >> 32; - ulong64 int1Lo = ulong64(tmp.lo & 0xFFFFFFFF); - - tmp = rhs; - if (tmp.hi < 0) Negate(tmp); - ulong64 int2Hi = ulong64(tmp.lo) >> 32; - ulong64 int2Lo = ulong64(tmp.lo & 0xFFFFFFFF); - - //nb: see comments in clipper.pas - ulong64 a = int1Hi * int2Hi; - ulong64 b = int1Lo * int2Lo; - ulong64 c = int1Hi * int2Lo + int1Lo * int2Hi; - - tmp.hi = long64(a + (c >> 32)); - tmp.lo = long64(c << 32); - tmp.lo += long64(b); - if (ulong64(tmp.lo) < b) tmp.hi++; - if (negate) Negate(tmp); - return tmp; - } - - Int128 operator/ (const Int128 &rhs) const - { - if (rhs.lo == 0 && rhs.hi == 0) - throw "Int128 operator/: divide by zero"; - bool negate = (rhs.hi < 0) != (hi < 0); - Int128 result(*this), denom(rhs); - if (result.hi < 0) Negate(result); - if (denom.hi < 0) Negate(denom); - if (denom > result) return Int128(0); //result is only a fraction of 1 - Negate(denom); - - Int128 p(0); - for (int i = 0; i < 128; ++i) - { - p.hi = p.hi << 1; - if (p.lo < 0) p.hi++; - p.lo = long64(p.lo) << 1; - if (result.hi < 0) p.lo++; - result.hi = result.hi << 1; - if (result.lo < 0) result.hi++; - result.lo = long64(result.lo) << 1; - Int128 p2(p); - p += denom; - if (p.hi < 0) p = p2; - else result.lo++; - } - if (negate) Negate(result); - return result; - } - - double AsDouble() const - { - const double shift64 = 18446744073709551616.0; //2^64 - const double bit64 = 9223372036854775808.0; - if (hi < 0) - { - Int128 tmp(*this); - Negate(tmp); - if (tmp.lo < 0) - return (double)tmp.lo - bit64 - tmp.hi * shift64; - else - return -(double)tmp.lo - tmp.hi * shift64; - } - else if (lo < 0) - return -(double)lo + bit64 + hi * shift64; - else - return (double)lo + (double)hi * shift64; - } - - //for bug testing ... - //std::string AsString() const - //{ - // std::string result; - // unsigned char r = 0; - // Int128 tmp(0), val(*this); - // if (hi < 0) Negate(val); - // result.resize(50); - // std::string::size_type i = result.size() -1; - // while (val.hi != 0 || val.lo != 0) - // { - // Div10(val, tmp, r); - // result[i--] = char('0' + r); - // val = tmp; - // } - // if (hi < 0) result[i--] = '-'; - // result.erase(0,i+1); - // if (result.size() == 0) result = "0"; - // return result; - //} - -private: - long64 hi; - long64 lo; - - static void Negate(Int128 &val) - { - if (val.lo == 0) { - if (val.hi != 0) val.hi = -val.hi;; - } - else { - val.lo = -val.lo; - val.hi = ~val.hi; - } - } - - //debugging only ... - //void Div10(const Int128 val, Int128& result, unsigned char & remainder) const - //{ - // remainder = 0; - // result = 0; - // for (int i = 63; i >= 0; --i) - // { - // if ((val.hi & ((long64)1 << i)) != 0) - // remainder = char((remainder * 2) + 1); else - // remainder *= char(2); - // if (remainder >= 10) - // { - // result.hi += ((long64)1 << i); - // remainder -= char(10); - // } - // } - // for (int i = 63; i >= 0; --i) - // { - // if ((val.lo & ((long64)1 << i)) != 0) - // remainder = char((remainder * 2) + 1); else - // remainder *= char(2); - // if (remainder >= 10) - // { - // result.lo += ((long64)1 << i); - // remainder -= char(10); - // } - // } - //} -}; - -//------------------------------------------------------------------------------ -//------------------------------------------------------------------------------ - -bool FullRangeNeeded(const Polygon &pts) -{ - bool result = false; - for (Polygon::size_type i = 0; i < pts.size(); ++i) - { - if (Abs(pts[i].X) > hiRange || Abs(pts[i].Y) > hiRange) - throw "Coordinate exceeds range bounds."; - else if (Abs(pts[i].X) > loRange || Abs(pts[i].Y) > loRange) - result = true; - } - return result; -} -//------------------------------------------------------------------------------ - -bool Orientation(const Polygon &poly) -{ - int highI = (int)poly.size() -1; - if (highI < 2) return false; - - int j = 0, jplus, jminus; - for (int i = 0; i <= highI; ++i) - { - if (poly[i].Y < poly[j].Y) continue; - if ((poly[i].Y > poly[j].Y || poly[i].X < poly[j].X)) j = i; - }; - if (j == highI) jplus = 0; - else jplus = j +1; - if (j == 0) jminus = highI; - else jminus = j -1; - - IntPoint vec1, vec2; - //get cross product of vectors of the edges adjacent to highest point ... - vec1.X = poly[j].X - poly[jminus].X; - vec1.Y = poly[j].Y - poly[jminus].Y; - vec2.X = poly[jplus].X - poly[j].X; - vec2.Y = poly[jplus].Y - poly[j].Y; - - if (Abs(vec1.X) > loRange || Abs(vec1.Y) > loRange || - Abs(vec2.X) > loRange || Abs(vec2.Y) > loRange) - { - if (Abs(vec1.X) > hiRange || Abs(vec1.Y) > hiRange || - Abs(vec2.X) > hiRange || Abs(vec2.Y) > hiRange) - throw "Coordinate exceeds range bounds."; - Int128 cross = Int128(vec1.X) * Int128(vec2.Y) - - Int128(vec2.X) * Int128(vec1.Y); - return cross >= 0; - } - else - return (vec1.X * vec2.Y - vec2.X * vec1.Y) >= 0; -} -//------------------------------------------------------------------------------ - -inline bool PointsEqual( const IntPoint &pt1, const IntPoint &pt2) -{ - return ( pt1.X == pt2.X && pt1.Y == pt2.Y ); -} -//------------------------------------------------------------------------------ - -bool Orientation(OutRec *outRec, bool UseFullInt64Range) -{ - if (!outRec->pts) - return 0.0; - - //first make sure bottomPt is correctly assigned ... - OutPt *opBottom = outRec->pts, *op = outRec->pts->next; - while (op != outRec->pts) - { - if (op->pt.Y >= opBottom->pt.Y) - { - if (op->pt.Y > opBottom->pt.Y || op->pt.X < opBottom->pt.X) - opBottom = op; - } - op = op->next; - } - outRec->bottomPt = opBottom; - opBottom->idx = outRec->idx; - - op = opBottom; - //find vertices either side of bottomPt (skipping duplicate points) .... - OutPt *opPrev = op->prev; - OutPt *opNext = op->next; - while (op != opPrev && PointsEqual(op->pt, opPrev->pt)) - opPrev = opPrev->prev; - while (op != opNext && PointsEqual(op->pt, opNext->pt)) - opNext = opNext->next; - - IntPoint ip1, ip2; - ip1.X = op->pt.X - opPrev->pt.X; - ip1.Y = op->pt.Y - opPrev->pt.Y; - ip2.X = opNext->pt.X - op->pt.X; - ip2.Y = opNext->pt.Y - op->pt.Y; - - if (UseFullInt64Range) - return Int128(ip1.X) * Int128(ip2.Y) - Int128(ip2.X) * Int128(ip1.Y) >= 0; - else - return (ip1.X * ip2.Y - ip2.X * ip1.Y) >= 0; -} -//------------------------------------------------------------------------------ - -double Area(const Polygon &poly) -{ - int highI = (int)poly.size() -1; - if (highI < 2) return 0; - - if (FullRangeNeeded(poly)) { - Int128 a; - a = (Int128(poly[highI].X) * Int128(poly[0].Y)) - - Int128(poly[0].X) * Int128(poly[highI].Y); - for (int i = 0; i < highI; ++i) - a += Int128(poly[i].X) * Int128(poly[i+1].Y) - - Int128(poly[i+1].X) * Int128(poly[i].Y); - return a.AsDouble() / 2; - } - else - { - double a; - a = (double)poly[highI].X * poly[0].Y - (double)poly[0].X * poly[highI].Y; - for (int i = 0; i < highI; ++i) - a += (double)poly[i].X * poly[i+1].Y - (double)poly[i+1].X * poly[i].Y; - return a/2; - } -} -//------------------------------------------------------------------------------ - -double Area(const OutRec &outRec, bool UseFullInt64Range) -{ - if (!outRec.pts) - return 0.0; - - OutPt *op = outRec.pts; - if (UseFullInt64Range) { - Int128 a(0); - do { - a += (Int128(op->prev->pt.X) * Int128(op->pt.Y)) - - Int128(op->pt.X) * Int128(op->prev->pt.Y); - op = op->next; - } while (op != outRec.pts); - return a.AsDouble() / 2; - } - else - { - double a = 0; - do { - a += (op->prev->pt.X * op->pt.Y) - (op->pt.X * op->prev->pt.Y); - op = op->next; - } while (op != outRec.pts); - return a/2; - } -} -//------------------------------------------------------------------------------ - -bool PointIsVertex(const IntPoint &pt, OutPt *pp) -{ - OutPt *pp2 = pp; - do - { - if (PointsEqual(pp2->pt, pt)) return true; - pp2 = pp2->next; - } - while (pp2 != pp); - return false; -} -//------------------------------------------------------------------------------ - -bool PointInPolygon(const IntPoint &pt, OutPt *pp, bool UseFullInt64Range) -{ - OutPt *pp2 = pp; - bool result = false; - if (UseFullInt64Range) { - do - { - if ((((pp2->pt.Y <= pt.Y) && (pt.Y < pp2->prev->pt.Y)) || - ((pp2->prev->pt.Y <= pt.Y) && (pt.Y < pp2->pt.Y))) && - Int128(pt.X - pp2->pt.X) < (Int128(pp2->prev->pt.X - pp2->pt.X) * - Int128(pt.Y - pp2->pt.Y)) / Int128(pp2->prev->pt.Y - pp2->pt.Y)) - result = !result; - pp2 = pp2->next; - } - while (pp2 != pp); - } - else - { - do - { - if ((((pp2->pt.Y <= pt.Y) && (pt.Y < pp2->prev->pt.Y)) || - ((pp2->prev->pt.Y <= pt.Y) && (pt.Y < pp2->pt.Y))) && - (pt.X < (pp2->prev->pt.X - pp2->pt.X) * (pt.Y - pp2->pt.Y) / - (pp2->prev->pt.Y - pp2->pt.Y) + pp2->pt.X )) result = !result; - pp2 = pp2->next; - } - while (pp2 != pp); - } - return result; -} -//------------------------------------------------------------------------------ - -bool SlopesEqual(TEdge &e1, TEdge &e2, bool UseFullInt64Range) -{ - if (UseFullInt64Range) - return Int128(e1.ytop - e1.ybot) * Int128(e2.xtop - e2.xbot) == - Int128(e1.xtop - e1.xbot) * Int128(e2.ytop - e2.ybot); - else return (e1.ytop - e1.ybot)*(e2.xtop - e2.xbot) == - (e1.xtop - e1.xbot)*(e2.ytop - e2.ybot); -} -//------------------------------------------------------------------------------ - -bool SlopesEqual(const IntPoint pt1, const IntPoint pt2, - const IntPoint pt3, bool UseFullInt64Range) -{ - if (UseFullInt64Range) - return Int128(pt1.Y-pt2.Y) * Int128(pt2.X-pt3.X) == - Int128(pt1.X-pt2.X) * Int128(pt2.Y-pt3.Y); - else return (pt1.Y-pt2.Y)*(pt2.X-pt3.X) == (pt1.X-pt2.X)*(pt2.Y-pt3.Y); -} -//------------------------------------------------------------------------------ - -bool SlopesEqual(const IntPoint pt1, const IntPoint pt2, - const IntPoint pt3, const IntPoint pt4, bool UseFullInt64Range) -{ - if (UseFullInt64Range) - return Int128(pt1.Y-pt2.Y) * Int128(pt3.X-pt4.X) == - Int128(pt1.X-pt2.X) * Int128(pt3.Y-pt4.Y); - else return (pt1.Y-pt2.Y)*(pt3.X-pt4.X) == (pt1.X-pt2.X)*(pt3.Y-pt4.Y); -} -//------------------------------------------------------------------------------ - -double GetDx(const IntPoint pt1, const IntPoint pt2) -{ - return (pt1.Y == pt2.Y) ? - HORIZONTAL : (double)(pt2.X - pt1.X) / (double)(pt2.Y - pt1.Y); -} -//--------------------------------------------------------------------------- - -void SetDx(TEdge &e) -{ - if (e.ybot == e.ytop) e.dx = HORIZONTAL; - else e.dx = (double)(e.xtop - e.xbot) / (double)(e.ytop - e.ybot); -} -//--------------------------------------------------------------------------- - -void SwapSides(TEdge &edge1, TEdge &edge2) -{ - EdgeSide side = edge1.side; - edge1.side = edge2.side; - edge2.side = side; -} -//------------------------------------------------------------------------------ - -void SwapPolyIndexes(TEdge &edge1, TEdge &edge2) -{ - int outIdx = edge1.outIdx; - edge1.outIdx = edge2.outIdx; - edge2.outIdx = outIdx; -} -//------------------------------------------------------------------------------ - -inline long64 Round(double val) -{ - return (val < 0) ? - static_cast<long64>(val - 0.5) : static_cast<long64>(val + 0.5); -} -//------------------------------------------------------------------------------ - -long64 TopX(TEdge &edge, const long64 currentY) -{ - return ( currentY == edge.ytop ) ? - edge.xtop : edge.xbot + Round(edge.dx *(currentY - edge.ybot)); -} -//------------------------------------------------------------------------------ - -long64 TopX(const IntPoint pt1, const IntPoint pt2, const long64 currentY) -{ - //preconditions: pt1.Y <> pt2.Y and pt1.Y > pt2.Y - if (currentY >= pt1.Y) return pt1.X; - else if (currentY == pt2.Y) return pt2.X; - else if (pt1.X == pt2.X) return pt1.X; - else - { - double q = (double)(pt1.X-pt2.X)/(double)(pt1.Y-pt2.Y); - return Round(pt1.X + (currentY - pt1.Y) *q); - } -} -//------------------------------------------------------------------------------ - -bool IntersectPoint(TEdge &edge1, TEdge &edge2, - IntPoint &ip, bool UseFullInt64Range) -{ - double b1, b2; - if (SlopesEqual(edge1, edge2, UseFullInt64Range)) return false; - else if (NEAR_ZERO(edge1.dx)) - { - ip.X = edge1.xbot; - if (NEAR_EQUAL(edge2.dx, HORIZONTAL)) - { - ip.Y = edge2.ybot; - } else - { - b2 = edge2.ybot - (edge2.xbot/edge2.dx); - ip.Y = Round(ip.X/edge2.dx + b2); - } - } - else if (NEAR_ZERO(edge2.dx)) - { - ip.X = edge2.xbot; - if (NEAR_EQUAL(edge1.dx, HORIZONTAL)) - { - ip.Y = edge1.ybot; - } else - { - b1 = edge1.ybot - (edge1.xbot/edge1.dx); - ip.Y = Round(ip.X/edge1.dx + b1); - } - } else - { - b1 = edge1.xbot - edge1.ybot * edge1.dx; - b2 = edge2.xbot - edge2.ybot * edge2.dx; - b2 = (b2-b1)/(edge1.dx - edge2.dx); - ip.Y = Round(b2); - ip.X = Round(edge1.dx * b2 + b1); - } - - return - //can be *so close* to the top of one edge that the rounded Y equals one ytop ... - (ip.Y == edge1.ytop && ip.Y >= edge2.ytop && edge1.tmpX > edge2.tmpX) || - (ip.Y == edge2.ytop && ip.Y >= edge1.ytop && edge1.tmpX > edge2.tmpX) || - (ip.Y > edge1.ytop && ip.Y > edge2.ytop); -} -//------------------------------------------------------------------------------ - -void ReversePolyPtLinks(OutPt &pp) -{ - OutPt *pp1, *pp2; - pp1 = &pp; - do { - pp2 = pp1->next; - pp1->next = pp1->prev; - pp1->prev = pp2; - pp1 = pp2; - } while( pp1 != &pp ); -} -//------------------------------------------------------------------------------ - -void DisposeOutPts(OutPt*& pp) -{ - if (pp == 0) return; - pp->prev->next = 0; - while( pp ) - { - OutPt *tmpPp = pp; - pp = pp->next; - delete tmpPp ; - } -} -//------------------------------------------------------------------------------ - -void InitEdge(TEdge *e, TEdge *eNext, - TEdge *ePrev, const IntPoint &pt, PolyType polyType) -{ - std::memset( e, 0, sizeof( TEdge )); - - e->next = eNext; - e->prev = ePrev; - e->xcurr = pt.X; - e->ycurr = pt.Y; - if (e->ycurr >= e->next->ycurr) - { - e->xbot = e->xcurr; - e->ybot = e->ycurr; - e->xtop = e->next->xcurr; - e->ytop = e->next->ycurr; - e->windDelta = 1; - } else - { - e->xtop = e->xcurr; - e->ytop = e->ycurr; - e->xbot = e->next->xcurr; - e->ybot = e->next->ycurr; - e->windDelta = -1; - } - SetDx(*e); - e->polyType = polyType; - e->outIdx = -1; -} -//------------------------------------------------------------------------------ - -inline void SwapX(TEdge &e) -{ - //swap horizontal edges' top and bottom x's so they follow the natural - //progression of the bounds - ie so their xbots will align with the - //adjoining lower edge. [Helpful in the ProcessHorizontal() method.] - e.xcurr = e.xtop; - e.xtop = e.xbot; - e.xbot = e.xcurr; -} -//------------------------------------------------------------------------------ - -void SwapPoints(IntPoint &pt1, IntPoint &pt2) -{ - IntPoint tmp = pt1; - pt1 = pt2; - pt2 = tmp; -} -//------------------------------------------------------------------------------ - -bool GetOverlapSegment(IntPoint pt1a, IntPoint pt1b, IntPoint pt2a, - IntPoint pt2b, IntPoint &pt1, IntPoint &pt2) -{ - //precondition: segments are colinear. - if ( pt1a.Y == pt1b.Y || Abs((pt1a.X - pt1b.X)/(pt1a.Y - pt1b.Y)) > 1 ) - { - if (pt1a.X > pt1b.X) SwapPoints(pt1a, pt1b); - if (pt2a.X > pt2b.X) SwapPoints(pt2a, pt2b); - if (pt1a.X > pt2a.X) pt1 = pt1a; else pt1 = pt2a; - if (pt1b.X < pt2b.X) pt2 = pt1b; else pt2 = pt2b; - return pt1.X < pt2.X; - } else - { - if (pt1a.Y < pt1b.Y) SwapPoints(pt1a, pt1b); - if (pt2a.Y < pt2b.Y) SwapPoints(pt2a, pt2b); - if (pt1a.Y < pt2a.Y) pt1 = pt1a; else pt1 = pt2a; - if (pt1b.Y > pt2b.Y) pt2 = pt1b; else pt2 = pt2b; - return pt1.Y > pt2.Y; - } -} -//------------------------------------------------------------------------------ - -bool FirstIsBottomPt(const OutPt* btmPt1, const OutPt* btmPt2) -{ - OutPt *p = btmPt1->prev; - while (PointsEqual(p->pt, btmPt1->pt) && (p != btmPt1)) p = p->prev; - double dx1p = std::fabs(GetDx(btmPt1->pt, p->pt)); - p = btmPt1->next; - while (PointsEqual(p->pt, btmPt1->pt) && (p != btmPt1)) p = p->next; - double dx1n = std::fabs(GetDx(btmPt1->pt, p->pt)); - - p = btmPt2->prev; - while (PointsEqual(p->pt, btmPt2->pt) && (p != btmPt2)) p = p->prev; - double dx2p = std::fabs(GetDx(btmPt2->pt, p->pt)); - p = btmPt2->next; - while (PointsEqual(p->pt, btmPt2->pt) && (p != btmPt2)) p = p->next; - double dx2n = std::fabs(GetDx(btmPt2->pt, p->pt)); - return (dx1p >= dx2p && dx1p >= dx2n) || (dx1n >= dx2p && dx1n >= dx2n); -} -//------------------------------------------------------------------------------ - -OutPt* GetBottomPt(OutPt *pp) -{ - OutPt* dups = 0; - OutPt* p = pp->next; - while (p != pp) - { - if (p->pt.Y > pp->pt.Y) - { - pp = p; - dups = 0; - } - else if (p->pt.Y == pp->pt.Y && p->pt.X <= pp->pt.X) - { - if (p->pt.X < pp->pt.X) - { - dups = 0; - pp = p; - } else - { - if (p->next != pp && p->prev != pp) dups = p; - } - } - p = p->next; - } - if (dups) - { - //there appears to be at least 2 vertices at bottomPt so ... - while (dups != p) - { - if (!FirstIsBottomPt(p, dups)) pp = dups; - dups = dups->next; - while (!PointsEqual(dups->pt, pp->pt)) dups = dups->next; - } - } - return pp; -} -//------------------------------------------------------------------------------ - -bool FindSegment(OutPt* &pp, IntPoint &pt1, IntPoint &pt2) -{ - //outPt1 & outPt2 => the overlap segment (if the function returns true) - if (!pp) return false; - OutPt* pp2 = pp; - IntPoint pt1a = pt1, pt2a = pt2; - do - { - if (SlopesEqual(pt1a, pt2a, pp->pt, pp->prev->pt, true) && - SlopesEqual(pt1a, pt2a, pp->pt, true) && - GetOverlapSegment(pt1a, pt2a, pp->pt, pp->prev->pt, pt1, pt2)) - return true; - pp = pp->next; - } - while (pp != pp2); - return false; -} -//------------------------------------------------------------------------------ - -bool Pt3IsBetweenPt1AndPt2(const IntPoint pt1, - const IntPoint pt2, const IntPoint pt3) -{ - if (PointsEqual(pt1, pt3) || PointsEqual(pt2, pt3)) return true; - else if (pt1.X != pt2.X) return (pt1.X < pt3.X) == (pt3.X < pt2.X); - else return (pt1.Y < pt3.Y) == (pt3.Y < pt2.Y); -} -//------------------------------------------------------------------------------ - -OutPt* InsertPolyPtBetween(OutPt* p1, OutPt* p2, const IntPoint pt) -{ - if (p1 == p2) throw "JoinError"; - OutPt* result = new OutPt; - result->pt = pt; - if (p2 == p1->next) - { - p1->next = result; - p2->prev = result; - result->next = p2; - result->prev = p1; - } else - { - p2->next = result; - p1->prev = result; - result->next = p1; - result->prev = p2; - } - return result; -} - -//------------------------------------------------------------------------------ -// ClipperBase class methods ... -//------------------------------------------------------------------------------ - -ClipperBase::ClipperBase() //constructor -{ - m_MinimaList = 0; - m_CurrentLM = 0; - m_UseFullRange = true; -} -//------------------------------------------------------------------------------ - -ClipperBase::~ClipperBase() //destructor -{ - Clear(); -} -//------------------------------------------------------------------------------ - -bool ClipperBase::AddPolygon( const Polygon &pg, PolyType polyType) -{ - int len = (int)pg.size(); - if (len < 3) return false; - Polygon p(len); - p[0] = pg[0]; - int j = 0; - - long64 maxVal; - if (m_UseFullRange) maxVal = hiRange; else maxVal = loRange; - - for (int i = 0; i < len; ++i) - { - if (Abs(pg[i].X) > maxVal || Abs(pg[i].Y) > maxVal) - { - if (Abs(pg[i].X) > hiRange || Abs(pg[i].Y) > hiRange) - throw "Coordinate exceeds range bounds"; - maxVal = hiRange; - m_UseFullRange = true; - } - - if (i == 0 || PointsEqual(p[j], pg[i])) continue; - else if (j > 0 && SlopesEqual(p[j-1], p[j], pg[i], m_UseFullRange)) - { - if (PointsEqual(p[j-1], pg[i])) j--; - } else j++; - p[j] = pg[i]; - } - if (j < 2) return false; - - len = j+1; - while (len > 2) - { - //nb: test for point equality before testing slopes ... - if (PointsEqual(p[j], p[0])) j--; - else if (PointsEqual(p[0], p[1]) || - SlopesEqual(p[j], p[0], p[1], m_UseFullRange)) - p[0] = p[j--]; - else if (SlopesEqual(p[j-1], p[j], p[0], m_UseFullRange)) j--; - else if (SlopesEqual(p[0], p[1], p[2], m_UseFullRange)) - { - for (int i = 2; i <= j; ++i) p[i-1] = p[i]; - j--; - } - else break; - len--; - } - if (len < 3) return false; - - //create a new edge array ... - TEdge *edges = new TEdge [len]; - m_edges.push_back(edges); - - //convert vertices to a double-linked-list of edges and initialize ... - edges[0].xcurr = p[0].X; - edges[0].ycurr = p[0].Y; - InitEdge(&edges[len-1], &edges[0], &edges[len-2], p[len-1], polyType); - for (int i = len-2; i > 0; --i) - InitEdge(&edges[i], &edges[i+1], &edges[i-1], p[i], polyType); - InitEdge(&edges[0], &edges[1], &edges[len-1], p[0], polyType); - - //reset xcurr & ycurr and find 'eHighest' (given the Y axis coordinates - //increase downward so the 'highest' edge will have the smallest ytop) ... - TEdge *e = &edges[0]; - TEdge *eHighest = e; - do - { - e->xcurr = e->xbot; - e->ycurr = e->ybot; - if (e->ytop < eHighest->ytop) eHighest = e; - e = e->next; - } - while ( e != &edges[0]); - - //make sure eHighest is positioned so the following loop works safely ... - if (eHighest->windDelta > 0) eHighest = eHighest->next; - if (NEAR_EQUAL(eHighest->dx, HORIZONTAL)) eHighest = eHighest->next; - - //finally insert each local minima ... - e = eHighest; - do { - e = AddBoundsToLML(e); - } - while( e != eHighest ); - return true; -} -//------------------------------------------------------------------------------ - -void ClipperBase::InsertLocalMinima(LocalMinima *newLm) -{ - if( ! m_MinimaList ) - { - m_MinimaList = newLm; - } - else if( newLm->Y >= m_MinimaList->Y ) - { - newLm->next = m_MinimaList; - m_MinimaList = newLm; - } else - { - LocalMinima* tmpLm = m_MinimaList; - while( tmpLm->next && ( newLm->Y < tmpLm->next->Y ) ) - tmpLm = tmpLm->next; - newLm->next = tmpLm->next; - tmpLm->next = newLm; - } -} -//------------------------------------------------------------------------------ - -TEdge* ClipperBase::AddBoundsToLML(TEdge *e) -{ - //Starting at the top of one bound we progress to the bottom where there's - //a local minima. We then go to the top of the next bound. These two bounds - //form the left and right (or right and left) bounds of the local minima. - e->nextInLML = 0; - e = e->next; - for (;;) - { - if (NEAR_EQUAL(e->dx, HORIZONTAL)) - { - //nb: proceed through horizontals when approaching from their right, - // but break on horizontal minima if approaching from their left. - // This ensures 'local minima' are always on the left of horizontals. - if (e->next->ytop < e->ytop && e->next->xbot > e->prev->xbot) break; - if (e->xtop != e->prev->xbot) SwapX(*e); - e->nextInLML = e->prev; - } - else if (e->ycurr == e->prev->ycurr) break; - else e->nextInLML = e->prev; - e = e->next; - } - - //e and e.prev are now at a local minima ... - LocalMinima* newLm = new LocalMinima; - newLm->next = 0; - newLm->Y = e->prev->ybot; - - if ( NEAR_EQUAL(e->dx, HORIZONTAL) ) //horizontal edges never start a left bound - { - if (e->xbot != e->prev->xbot) SwapX(*e); - newLm->leftBound = e->prev; - newLm->rightBound = e; - } else if (e->dx < e->prev->dx) - { - newLm->leftBound = e->prev; - newLm->rightBound = e; - } else - { - newLm->leftBound = e; - newLm->rightBound = e->prev; - } - newLm->leftBound->side = esLeft; - newLm->rightBound->side = esRight; - InsertLocalMinima( newLm ); - - for (;;) - { - if ( e->next->ytop == e->ytop && !NEAR_EQUAL(e->next->dx, HORIZONTAL) ) break; - e->nextInLML = e->next; - e = e->next; - if ( NEAR_EQUAL(e->dx, HORIZONTAL) && e->xbot != e->prev->xtop) SwapX(*e); - } - return e->next; -} -//------------------------------------------------------------------------------ - -bool ClipperBase::AddPolygons(const Polygons &ppg, PolyType polyType) -{ - bool result = false; - for (Polygons::size_type i = 0; i < ppg.size(); ++i) - if (AddPolygon(ppg[i], polyType)) result = true; - return result; -} -//------------------------------------------------------------------------------ - -void ClipperBase::Clear() -{ - DisposeLocalMinimaList(); - for (EdgeList::size_type i = 0; i < m_edges.size(); ++i) delete [] m_edges[i]; - m_edges.clear(); - m_UseFullRange = false; -} -//------------------------------------------------------------------------------ - -void ClipperBase::Reset() -{ - m_CurrentLM = m_MinimaList; - if( !m_CurrentLM ) return; //ie nothing to process - - //reset all edges ... - LocalMinima* lm = m_MinimaList; - while( lm ) - { - TEdge* e = lm->leftBound; - while( e ) - { - e->xcurr = e->xbot; - e->ycurr = e->ybot; - e->side = esLeft; - e->outIdx = -1; - e = e->nextInLML; - } - e = lm->rightBound; - while( e ) - { - e->xcurr = e->xbot; - e->ycurr = e->ybot; - e->side = esRight; - e->outIdx = -1; - e = e->nextInLML; - } - lm = lm->next; - } -} -//------------------------------------------------------------------------------ - -void ClipperBase::DisposeLocalMinimaList() -{ - while( m_MinimaList ) - { - LocalMinima* tmpLm = m_MinimaList->next; - delete m_MinimaList; - m_MinimaList = tmpLm; - } - m_CurrentLM = 0; -} -//------------------------------------------------------------------------------ - -void ClipperBase::PopLocalMinima() -{ - if( ! m_CurrentLM ) return; - m_CurrentLM = m_CurrentLM->next; -} -//------------------------------------------------------------------------------ - -IntRect ClipperBase::GetBounds() -{ - IntRect result; - LocalMinima* lm = m_MinimaList; - if (!lm) - { - result.left = result.top = result.right = result.bottom = 0; - return result; - } - result.left = lm->leftBound->xbot; - result.top = lm->leftBound->ybot; - result.right = lm->leftBound->xbot; - result.bottom = lm->leftBound->ybot; - while (lm) - { - if (lm->leftBound->ybot > result.bottom) - result.bottom = lm->leftBound->ybot; - TEdge* e = lm->leftBound; - for (;;) { - TEdge* bottomE = e; - while (e->nextInLML) - { - if (e->xbot < result.left) result.left = e->xbot; - if (e->xbot > result.right) result.right = e->xbot; - e = e->nextInLML; - } - if (e->xbot < result.left) result.left = e->xbot; - if (e->xbot > result.right) result.right = e->xbot; - if (e->xtop < result.left) result.left = e->xtop; - if (e->xtop > result.right) result.right = e->xtop; - if (e->ytop < result.top) result.top = e->ytop; - - if (bottomE == lm->leftBound) e = lm->rightBound; - else break; - } - lm = lm->next; - } - return result; -} - - -//------------------------------------------------------------------------------ -// TClipper methods ... -//------------------------------------------------------------------------------ - -Clipper::Clipper() : ClipperBase() //constructor -{ - m_Scanbeam = 0; - m_ActiveEdges = 0; - m_SortedEdges = 0; - m_IntersectNodes = 0; - m_ExecuteLocked = false; - m_UseFullRange = false; - m_ReverseOutput = false; -} -//------------------------------------------------------------------------------ - -Clipper::~Clipper() //destructor -{ - Clear(); - DisposeScanbeamList(); -} -//------------------------------------------------------------------------------ - -void Clipper::Clear() -{ - if (m_edges.size() == 0) return; //avoids problems with ClipperBase destructor - DisposeAllPolyPts(); - ClipperBase::Clear(); -} -//------------------------------------------------------------------------------ - -void Clipper::DisposeScanbeamList() -{ - while ( m_Scanbeam ) { - Scanbeam* sb2 = m_Scanbeam->next; - delete m_Scanbeam; - m_Scanbeam = sb2; - } -} -//------------------------------------------------------------------------------ - -void Clipper::Reset() -{ - ClipperBase::Reset(); - m_Scanbeam = 0; - m_ActiveEdges = 0; - m_SortedEdges = 0; - DisposeAllPolyPts(); - LocalMinima* lm = m_MinimaList; - while (lm) - { - InsertScanbeam(lm->Y); - InsertScanbeam(lm->leftBound->ytop); - lm = lm->next; - } -} -//------------------------------------------------------------------------------ - -bool Clipper::Execute(ClipType clipType, Polygons &solution, - PolyFillType subjFillType, PolyFillType clipFillType) -{ - if( m_ExecuteLocked ) return false; - m_ExecuteLocked = true; - solution.resize(0); - m_SubjFillType = subjFillType; - m_ClipFillType = clipFillType; - m_ClipType = clipType; - bool succeeded = ExecuteInternal(false); - if (succeeded) BuildResult(solution); - m_ExecuteLocked = false; - return succeeded; -} -//------------------------------------------------------------------------------ - -bool Clipper::Execute(ClipType clipType, ExPolygons &solution, - PolyFillType subjFillType, PolyFillType clipFillType) -{ - if( m_ExecuteLocked ) return false; - m_ExecuteLocked = true; - solution.resize(0); - m_SubjFillType = subjFillType; - m_ClipFillType = clipFillType; - m_ClipType = clipType; - bool succeeded = ExecuteInternal(true); - if (succeeded) BuildResultEx(solution); - m_ExecuteLocked = false; - return succeeded; -} -//------------------------------------------------------------------------------ - -bool PolySort(OutRec *or1, OutRec *or2) -{ - if (or1 == or2) return false; - if (!or1->pts || !or2->pts) - { - if (or1->pts != or2->pts) - { - return or1->pts ? true : false; - } - else return false; - } - int i1, i2; - if (or1->isHole) - i1 = or1->FirstLeft->idx; else - i1 = or1->idx; - if (or2->isHole) - i2 = or2->FirstLeft->idx; else - i2 = or2->idx; - int result = i1 - i2; - if (result == 0 && (or1->isHole != or2->isHole)) - { - return or1->isHole ? false : true; - } - else return result < 0; -} -//------------------------------------------------------------------------------ - -OutRec* FindAppendLinkEnd(OutRec *outRec) -{ - while (outRec->AppendLink) outRec = outRec->AppendLink; - return outRec; -} -//------------------------------------------------------------------------------ - -void Clipper::FixHoleLinkage(OutRec *outRec) -{ - OutRec *tmp; - if (outRec->bottomPt) - tmp = m_PolyOuts[outRec->bottomPt->idx]->FirstLeft; - else - tmp = outRec->FirstLeft; - if (outRec == tmp) throw clipperException("HoleLinkage error"); - - if (tmp) - { - if (tmp->AppendLink) tmp = FindAppendLinkEnd(tmp); - if (tmp == outRec) tmp = 0; - else if (tmp->isHole) - { - FixHoleLinkage(tmp); - tmp = tmp->FirstLeft; - } - } - outRec->FirstLeft = tmp; - if (!tmp) outRec->isHole = false; - outRec->AppendLink = 0; -} -//------------------------------------------------------------------------------ - -bool Clipper::ExecuteInternal(bool fixHoleLinkages) -{ - bool succeeded; - try { - Reset(); - if (!m_CurrentLM ) return true; - long64 botY = PopScanbeam(); - do { - InsertLocalMinimaIntoAEL(botY); - ClearHorzJoins(); - ProcessHorizontals(); - long64 topY = PopScanbeam(); - succeeded = ProcessIntersections(botY, topY); - if (!succeeded) break; - ProcessEdgesAtTopOfScanbeam(topY); - botY = topY; - } while( m_Scanbeam ); - } - catch(...) { - succeeded = false; - } - - if (succeeded) - { - //tidy up output polygons and fix orientations where necessary ... - for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i) - { - OutRec *outRec = m_PolyOuts[i]; - if (!outRec->pts) continue; - FixupOutPolygon(*outRec); - if (!outRec->pts) continue; - if (outRec->isHole && fixHoleLinkages) FixHoleLinkage(outRec); - - if (outRec->bottomPt == outRec->bottomFlag && - (Orientation(outRec, m_UseFullRange) != (Area(*outRec, m_UseFullRange) > 0))) - DisposeBottomPt(*outRec); - - if (outRec->isHole == - (m_ReverseOutput ^ Orientation(outRec, m_UseFullRange))) - ReversePolyPtLinks(*outRec->pts); - } - - JoinCommonEdges(fixHoleLinkages); - if (fixHoleLinkages) - std::sort(m_PolyOuts.begin(), m_PolyOuts.end(), PolySort); - } - - ClearJoins(); - ClearHorzJoins(); - return succeeded; -} -//------------------------------------------------------------------------------ - -void Clipper::InsertScanbeam(const long64 Y) -{ - if( !m_Scanbeam ) - { - m_Scanbeam = new Scanbeam; - m_Scanbeam->next = 0; - m_Scanbeam->Y = Y; - } - else if( Y > m_Scanbeam->Y ) - { - Scanbeam* newSb = new Scanbeam; - newSb->Y = Y; - newSb->next = m_Scanbeam; - m_Scanbeam = newSb; - } else - { - Scanbeam* sb2 = m_Scanbeam; - while( sb2->next && ( Y <= sb2->next->Y ) ) sb2 = sb2->next; - if( Y == sb2->Y ) return; //ie ignores duplicates - Scanbeam* newSb = new Scanbeam; - newSb->Y = Y; - newSb->next = sb2->next; - sb2->next = newSb; - } -} -//------------------------------------------------------------------------------ - -long64 Clipper::PopScanbeam() -{ - long64 Y = m_Scanbeam->Y; - Scanbeam* sb2 = m_Scanbeam; - m_Scanbeam = m_Scanbeam->next; - delete sb2; - return Y; -} -//------------------------------------------------------------------------------ - -void Clipper::DisposeAllPolyPts(){ - for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i) - DisposeOutRec(i); - m_PolyOuts.clear(); -} -//------------------------------------------------------------------------------ - -void Clipper::DisposeOutRec(PolyOutList::size_type index) -{ - OutRec *outRec = m_PolyOuts[index]; - if (outRec->pts) DisposeOutPts(outRec->pts); - delete outRec; - m_PolyOuts[index] = 0; -} -//------------------------------------------------------------------------------ - -void Clipper::SetWindingCount(TEdge &edge) -{ - TEdge *e = edge.prevInAEL; - //find the edge of the same polytype that immediately preceeds 'edge' in AEL - while ( e && e->polyType != edge.polyType ) e = e->prevInAEL; - if ( !e ) - { - edge.windCnt = edge.windDelta; - edge.windCnt2 = 0; - e = m_ActiveEdges; //ie get ready to calc windCnt2 - } else if ( IsEvenOddFillType(edge) ) - { - //EvenOdd filling ... - edge.windCnt = 1; - edge.windCnt2 = e->windCnt2; - e = e->nextInAEL; //ie get ready to calc windCnt2 - } else - { - //nonZero, Positive or Negative filling ... - if ( e->windCnt * e->windDelta < 0 ) - { - if (Abs(e->windCnt) > 1) - { - if (e->windDelta * edge.windDelta < 0) edge.windCnt = e->windCnt; - else edge.windCnt = e->windCnt + edge.windDelta; - } else - edge.windCnt = e->windCnt + e->windDelta + edge.windDelta; - } else - { - if ( Abs(e->windCnt) > 1 && e->windDelta * edge.windDelta < 0) - edge.windCnt = e->windCnt; - else if ( e->windCnt + edge.windDelta == 0 ) - edge.windCnt = e->windCnt; - else edge.windCnt = e->windCnt + edge.windDelta; - } - edge.windCnt2 = e->windCnt2; - e = e->nextInAEL; //ie get ready to calc windCnt2 - } - - //update windCnt2 ... - if ( IsEvenOddAltFillType(edge) ) - { - //EvenOdd filling ... - while ( e != &edge ) - { - edge.windCnt2 = (edge.windCnt2 == 0) ? 1 : 0; - e = e->nextInAEL; - } - } else - { - //nonZero, Positive or Negative filling ... - while ( e != &edge ) - { - edge.windCnt2 += e->windDelta; - e = e->nextInAEL; - } - } -} -//------------------------------------------------------------------------------ - -bool Clipper::IsEvenOddFillType(const TEdge& edge) const -{ - if (edge.polyType == ptSubject) - return m_SubjFillType == pftEvenOdd; else - return m_ClipFillType == pftEvenOdd; -} -//------------------------------------------------------------------------------ - -bool Clipper::IsEvenOddAltFillType(const TEdge& edge) const -{ - if (edge.polyType == ptSubject) - return m_ClipFillType == pftEvenOdd; else - return m_SubjFillType == pftEvenOdd; -} -//------------------------------------------------------------------------------ - -bool Clipper::IsContributing(const TEdge& edge) const -{ - PolyFillType pft, pft2; - if (edge.polyType == ptSubject) - { - pft = m_SubjFillType; - pft2 = m_ClipFillType; - } else - { - pft = m_ClipFillType; - pft2 = m_SubjFillType; - } - - switch(pft) - { - case pftEvenOdd: - case pftNonZero: - if (Abs(edge.windCnt) != 1) return false; - break; - case pftPositive: - if (edge.windCnt != 1) return false; - break; - default: //pftNegative - if (edge.windCnt != -1) return false; - } - - switch(m_ClipType) - { - case ctIntersection: - switch(pft2) - { - case pftEvenOdd: - case pftNonZero: - return (edge.windCnt2 != 0); - case pftPositive: - return (edge.windCnt2 > 0); - default: - return (edge.windCnt2 < 0); - } - case ctUnion: - switch(pft2) - { - case pftEvenOdd: - case pftNonZero: - return (edge.windCnt2 == 0); - case pftPositive: - return (edge.windCnt2 <= 0); - default: - return (edge.windCnt2 >= 0); - } - case ctDifference: - if (edge.polyType == ptSubject) - switch(pft2) - { - case pftEvenOdd: - case pftNonZero: - return (edge.windCnt2 == 0); - case pftPositive: - return (edge.windCnt2 <= 0); - default: - return (edge.windCnt2 >= 0); - } - else - switch(pft2) - { - case pftEvenOdd: - case pftNonZero: - return (edge.windCnt2 != 0); - case pftPositive: - return (edge.windCnt2 > 0); - default: - return (edge.windCnt2 < 0); - } - default: - return true; - } -} -//------------------------------------------------------------------------------ - -void Clipper::AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &pt) -{ - TEdge *e, *prevE; - if( NEAR_EQUAL(e2->dx, HORIZONTAL) || ( e1->dx > e2->dx ) ) - { - AddOutPt( e1, pt ); - e2->outIdx = e1->outIdx; - e1->side = esLeft; - e2->side = esRight; - e = e1; - if (e->prevInAEL == e2) - prevE = e2->prevInAEL; - else - prevE = e->prevInAEL; - } else - { - AddOutPt( e2, pt ); - e1->outIdx = e2->outIdx; - e1->side = esRight; - e2->side = esLeft; - e = e2; - if (e->prevInAEL == e1) - prevE = e1->prevInAEL; - else - prevE = e->prevInAEL; - } - if (prevE && prevE->outIdx >= 0 && - (TopX(*prevE, pt.Y) == TopX(*e, pt.Y)) && - SlopesEqual(*e, *prevE, m_UseFullRange)) - AddJoin(e, prevE, -1, -1); -} -//------------------------------------------------------------------------------ - -void Clipper::AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &pt) -{ - AddOutPt( e1, pt ); - if( e1->outIdx == e2->outIdx ) - { - e1->outIdx = -1; - e2->outIdx = -1; - } - else if (e1->outIdx < e2->outIdx) - AppendPolygon(e1, e2); - else - AppendPolygon(e2, e1); -} -//------------------------------------------------------------------------------ - -void Clipper::AddEdgeToSEL(TEdge *edge) -{ - //SEL pointers in PEdge are reused to build a list of horizontal edges. - //However, we don't need to worry about order with horizontal edge processing. - if( !m_SortedEdges ) - { - m_SortedEdges = edge; - edge->prevInSEL = 0; - edge->nextInSEL = 0; - } - else - { - edge->nextInSEL = m_SortedEdges; - edge->prevInSEL = 0; - m_SortedEdges->prevInSEL = edge; - m_SortedEdges = edge; - } -} -//------------------------------------------------------------------------------ - -void Clipper::CopyAELToSEL() -{ - TEdge* e = m_ActiveEdges; - m_SortedEdges = e; - if (!m_ActiveEdges) return; - m_SortedEdges->prevInSEL = 0; - e = e->nextInAEL; - while ( e ) - { - e->prevInSEL = e->prevInAEL; - e->prevInSEL->nextInSEL = e; - e->nextInSEL = 0; - e = e->nextInAEL; - } -} -//------------------------------------------------------------------------------ - -void Clipper::AddJoin(TEdge *e1, TEdge *e2, int e1OutIdx, int e2OutIdx) -{ - JoinRec* jr = new JoinRec; - if (e1OutIdx >= 0) - jr->poly1Idx = e1OutIdx; else - jr->poly1Idx = e1->outIdx; - jr->pt1a = IntPoint(e1->xcurr, e1->ycurr); - jr->pt1b = IntPoint(e1->xtop, e1->ytop); - if (e2OutIdx >= 0) - jr->poly2Idx = e2OutIdx; else - jr->poly2Idx = e2->outIdx; - jr->pt2a = IntPoint(e2->xcurr, e2->ycurr); - jr->pt2b = IntPoint(e2->xtop, e2->ytop); - m_Joins.push_back(jr); -} -//------------------------------------------------------------------------------ - -void Clipper::ClearJoins() -{ - for (JoinList::size_type i = 0; i < m_Joins.size(); i++) - delete m_Joins[i]; - m_Joins.resize(0); -} -//------------------------------------------------------------------------------ - -void Clipper::AddHorzJoin(TEdge *e, int idx) -{ - HorzJoinRec* hj = new HorzJoinRec; - hj->edge = e; - hj->savedIdx = idx; - m_HorizJoins.push_back(hj); -} -//------------------------------------------------------------------------------ - -void Clipper::ClearHorzJoins() -{ - for (HorzJoinList::size_type i = 0; i < m_HorizJoins.size(); i++) - delete m_HorizJoins[i]; - m_HorizJoins.resize(0); -} -//------------------------------------------------------------------------------ - -void Clipper::InsertLocalMinimaIntoAEL( const long64 botY) -{ - while( m_CurrentLM && ( m_CurrentLM->Y == botY ) ) - { - TEdge* lb = m_CurrentLM->leftBound; - TEdge* rb = m_CurrentLM->rightBound; - - InsertEdgeIntoAEL( lb ); - InsertScanbeam( lb->ytop ); - InsertEdgeIntoAEL( rb ); - - if (IsEvenOddFillType(*lb)) - { - lb->windDelta = 1; - rb->windDelta = 1; - } - else - { - rb->windDelta = -lb->windDelta; - } - SetWindingCount( *lb ); - rb->windCnt = lb->windCnt; - rb->windCnt2 = lb->windCnt2; - - if( NEAR_EQUAL(rb->dx, HORIZONTAL) ) - { - //nb: only rightbounds can have a horizontal bottom edge - AddEdgeToSEL( rb ); - InsertScanbeam( rb->nextInLML->ytop ); - } - else - InsertScanbeam( rb->ytop ); - - if( IsContributing(*lb) ) - AddLocalMinPoly( lb, rb, IntPoint(lb->xcurr, m_CurrentLM->Y) ); - - //if any output polygons share an edge, they'll need joining later ... - if (rb->outIdx >= 0) - { - if (NEAR_EQUAL(rb->dx, HORIZONTAL)) - { - for (HorzJoinList::size_type i = 0; i < m_HorizJoins.size(); ++i) - { - IntPoint pt, pt2; //returned by GetOverlapSegment() but unused here. - HorzJoinRec* hj = m_HorizJoins[i]; - //if horizontals rb and hj.edge overlap, flag for joining later ... - if (GetOverlapSegment(IntPoint(hj->edge->xbot, hj->edge->ybot), - IntPoint(hj->edge->xtop, hj->edge->ytop), - IntPoint(rb->xbot, rb->ybot), - IntPoint(rb->xtop, rb->ytop), pt, pt2)) - AddJoin(hj->edge, rb, hj->savedIdx); - } - } - } - - if( lb->nextInAEL != rb ) - { - if (rb->outIdx >= 0 && rb->prevInAEL->outIdx >= 0 && - SlopesEqual(*rb->prevInAEL, *rb, m_UseFullRange)) - AddJoin(rb, rb->prevInAEL); - - TEdge* e = lb->nextInAEL; - IntPoint pt = IntPoint(lb->xcurr, lb->ycurr); - while( e != rb ) - { - if(!e) throw clipperException("InsertLocalMinimaIntoAEL: missing rightbound!"); - //nb: For calculating winding counts etc, IntersectEdges() assumes - //that param1 will be to the right of param2 ABOVE the intersection ... - IntersectEdges( rb , e , pt , ipNone); //order important here - e = e->nextInAEL; - } - } - PopLocalMinima(); - } -} -//------------------------------------------------------------------------------ - -void Clipper::DeleteFromAEL(TEdge *e) -{ - TEdge* AelPrev = e->prevInAEL; - TEdge* AelNext = e->nextInAEL; - if( !AelPrev && !AelNext && (e != m_ActiveEdges) ) return; //already deleted - if( AelPrev ) AelPrev->nextInAEL = AelNext; - else m_ActiveEdges = AelNext; - if( AelNext ) AelNext->prevInAEL = AelPrev; - e->nextInAEL = 0; - e->prevInAEL = 0; -} -//------------------------------------------------------------------------------ - -void Clipper::DeleteFromSEL(TEdge *e) -{ - TEdge* SelPrev = e->prevInSEL; - TEdge* SelNext = e->nextInSEL; - if( !SelPrev && !SelNext && (e != m_SortedEdges) ) return; //already deleted - if( SelPrev ) SelPrev->nextInSEL = SelNext; - else m_SortedEdges = SelNext; - if( SelNext ) SelNext->prevInSEL = SelPrev; - e->nextInSEL = 0; - e->prevInSEL = 0; -} -//------------------------------------------------------------------------------ - -void Clipper::IntersectEdges(TEdge *e1, TEdge *e2, - const IntPoint &pt, IntersectProtects protects) -{ - //e1 will be to the left of e2 BELOW the intersection. Therefore e1 is before - //e2 in AEL except when e1 is being inserted at the intersection point ... - bool e1stops = !(ipLeft & protects) && !e1->nextInLML && - e1->xtop == pt.X && e1->ytop == pt.Y; - bool e2stops = !(ipRight & protects) && !e2->nextInLML && - e2->xtop == pt.X && e2->ytop == pt.Y; - bool e1Contributing = ( e1->outIdx >= 0 ); - bool e2contributing = ( e2->outIdx >= 0 ); - - //update winding counts... - //assumes that e1 will be to the right of e2 ABOVE the intersection - if ( e1->polyType == e2->polyType ) - { - if ( IsEvenOddFillType( *e1) ) - { - int oldE1WindCnt = e1->windCnt; - e1->windCnt = e2->windCnt; - e2->windCnt = oldE1WindCnt; - } else - { - if (e1->windCnt + e2->windDelta == 0 ) e1->windCnt = -e1->windCnt; - else e1->windCnt += e2->windDelta; - if ( e2->windCnt - e1->windDelta == 0 ) e2->windCnt = -e2->windCnt; - else e2->windCnt -= e1->windDelta; - } - } else - { - if (!IsEvenOddFillType(*e2)) e1->windCnt2 += e2->windDelta; - else e1->windCnt2 = ( e1->windCnt2 == 0 ) ? 1 : 0; - if (!IsEvenOddFillType(*e1)) e2->windCnt2 -= e1->windDelta; - else e2->windCnt2 = ( e2->windCnt2 == 0 ) ? 1 : 0; - } - - PolyFillType e1FillType, e2FillType, e1FillType2, e2FillType2; - if (e1->polyType == ptSubject) - { - e1FillType = m_SubjFillType; - e1FillType2 = m_ClipFillType; - } else - { - e1FillType = m_ClipFillType; - e1FillType2 = m_SubjFillType; - } - if (e2->polyType == ptSubject) - { - e2FillType = m_SubjFillType; - e2FillType2 = m_ClipFillType; - } else - { - e2FillType = m_ClipFillType; - e2FillType2 = m_SubjFillType; - } - - long64 e1Wc, e2Wc; - switch (e1FillType) - { - case pftPositive: e1Wc = e1->windCnt; break; - case pftNegative: e1Wc = -e1->windCnt; break; - default: e1Wc = Abs(e1->windCnt); - } - switch(e2FillType) - { - case pftPositive: e2Wc = e2->windCnt; break; - case pftNegative: e2Wc = -e2->windCnt; break; - default: e2Wc = Abs(e2->windCnt); - } - - if ( e1Contributing && e2contributing ) - { - if ( e1stops || e2stops || - (e1Wc != 0 && e1Wc != 1) || (e2Wc != 0 && e2Wc != 1) || - (e1->polyType != e2->polyType && m_ClipType != ctXor) ) - AddLocalMaxPoly(e1, e2, pt); - else - DoBothEdges( e1, e2, pt ); - } - else if ( e1Contributing ) - { - if ((e2Wc == 0 || e2Wc == 1) && - (m_ClipType != ctIntersection || - e2->polyType == ptSubject || (e2->windCnt2 != 0))) - DoEdge1(e1, e2, pt); - } - else if ( e2contributing ) - { - if ((e1Wc == 0 || e1Wc == 1) && - (m_ClipType != ctIntersection || - e1->polyType == ptSubject || (e1->windCnt2 != 0))) - DoEdge2(e1, e2, pt); - } - else if ( (e1Wc == 0 || e1Wc == 1) && - (e2Wc == 0 || e2Wc == 1) && !e1stops && !e2stops ) - { - //neither edge is currently contributing ... - - long64 e1Wc2, e2Wc2; - switch (e1FillType2) - { - case pftPositive: e1Wc2 = e1->windCnt2; break; - case pftNegative : e1Wc2 = -e1->windCnt2; break; - default: e1Wc2 = Abs(e1->windCnt2); - } - switch (e2FillType2) - { - case pftPositive: e2Wc2 = e2->windCnt2; break; - case pftNegative: e2Wc2 = -e2->windCnt2; break; - default: e2Wc2 = Abs(e2->windCnt2); - } - - if (e1->polyType != e2->polyType) - AddLocalMinPoly(e1, e2, pt); - else if (e1Wc == 1 && e2Wc == 1) - switch( m_ClipType ) { - case ctIntersection: - if (e1Wc2 > 0 && e2Wc2 > 0) - AddLocalMinPoly(e1, e2, pt); - break; - case ctUnion: - if ( e1Wc2 <= 0 && e2Wc2 <= 0 ) - AddLocalMinPoly(e1, e2, pt); - break; - case ctDifference: - if (((e1->polyType == ptClip) && (e1Wc2 > 0) && (e2Wc2 > 0)) || - ((e1->polyType == ptSubject) && (e1Wc2 <= 0) && (e2Wc2 <= 0))) - AddLocalMinPoly(e1, e2, pt); - break; - case ctXor: - AddLocalMinPoly(e1, e2, pt); - } - else - SwapSides( *e1, *e2 ); - } - - if( (e1stops != e2stops) && - ( (e1stops && (e1->outIdx >= 0)) || (e2stops && (e2->outIdx >= 0)) ) ) - { - SwapSides( *e1, *e2 ); - SwapPolyIndexes( *e1, *e2 ); - } - - //finally, delete any non-contributing maxima edges ... - if( e1stops ) DeleteFromAEL( e1 ); - if( e2stops ) DeleteFromAEL( e2 ); -} -//------------------------------------------------------------------------------ - -void Clipper::SetHoleState(TEdge *e, OutRec *outRec) -{ - bool isHole = false; - TEdge *e2 = e->prevInAEL; - while (e2) - { - if (e2->outIdx >= 0) - { - isHole = !isHole; - if (! outRec->FirstLeft) - outRec->FirstLeft = m_PolyOuts[e2->outIdx]; - } - e2 = e2->prevInAEL; - } - if (isHole) outRec->isHole = true; -} -//------------------------------------------------------------------------------ - -OutRec* GetLowermostRec(OutRec *outRec1, OutRec *outRec2) -{ - //work out which polygon fragment has the correct hole state ... - OutPt *outPt1 = outRec1->bottomPt; - OutPt *outPt2 = outRec2->bottomPt; - if (outPt1->pt.Y > outPt2->pt.Y) return outRec1; - else if (outPt1->pt.Y < outPt2->pt.Y) return outRec2; - else if (outPt1->pt.X < outPt2->pt.X) return outRec1; - else if (outPt1->pt.X > outPt2->pt.X) return outRec2; - else if (outPt1->next == outPt1) return outRec2; - else if (outPt2->next == outPt2) return outRec1; - else if (FirstIsBottomPt(outPt1, outPt2)) return outRec1; - else return outRec2; -} -//------------------------------------------------------------------------------ - -bool Param1RightOfParam2(OutRec* outRec1, OutRec* outRec2) -{ - do - { - outRec1 = outRec1->FirstLeft; - if (outRec1 == outRec2) return true; - } while (outRec1); - return false; -} -//------------------------------------------------------------------------------ - -void Clipper::AppendPolygon(TEdge *e1, TEdge *e2) -{ - //get the start and ends of both output polygons ... - OutRec *outRec1 = m_PolyOuts[e1->outIdx]; - OutRec *outRec2 = m_PolyOuts[e2->outIdx]; - - OutRec *holeStateRec; - if (Param1RightOfParam2(outRec1, outRec2)) holeStateRec = outRec2; - else if (Param1RightOfParam2(outRec2, outRec1)) holeStateRec = outRec1; - else holeStateRec = GetLowermostRec(outRec1, outRec2); - - OutPt* p1_lft = outRec1->pts; - OutPt* p1_rt = p1_lft->prev; - OutPt* p2_lft = outRec2->pts; - OutPt* p2_rt = p2_lft->prev; - - EdgeSide side; - //join e2 poly onto e1 poly and delete pointers to e2 ... - if( e1->side == esLeft ) - { - if( e2->side == esLeft ) - { - //z y x a b c - ReversePolyPtLinks(*p2_lft); - p2_lft->next = p1_lft; - p1_lft->prev = p2_lft; - p1_rt->next = p2_rt; - p2_rt->prev = p1_rt; - outRec1->pts = p2_rt; - } else - { - //x y z a b c - p2_rt->next = p1_lft; - p1_lft->prev = p2_rt; - p2_lft->prev = p1_rt; - p1_rt->next = p2_lft; - outRec1->pts = p2_lft; - } - side = esLeft; - } else - { - if( e2->side == esRight ) - { - //a b c z y x - ReversePolyPtLinks( *p2_lft ); - p1_rt->next = p2_rt; - p2_rt->prev = p1_rt; - p2_lft->next = p1_lft; - p1_lft->prev = p2_lft; - } else - { - //a b c x y z - p1_rt->next = p2_lft; - p2_lft->prev = p1_rt; - p1_lft->prev = p2_rt; - p2_rt->next = p1_lft; - } - side = esRight; - } - - if (holeStateRec == outRec2) - { - outRec1->bottomPt = outRec2->bottomPt; - outRec1->bottomPt->idx = outRec1->idx; - if (outRec2->FirstLeft != outRec1) - outRec1->FirstLeft = outRec2->FirstLeft; - outRec1->isHole = outRec2->isHole; - } - outRec2->pts = 0; - outRec2->bottomPt = 0; - outRec2->AppendLink = outRec1; - int OKIdx = e1->outIdx; - int ObsoleteIdx = e2->outIdx; - - e1->outIdx = -1; //nb: safe because we only get here via AddLocalMaxPoly - e2->outIdx = -1; - - TEdge* e = m_ActiveEdges; - while( e ) - { - if( e->outIdx == ObsoleteIdx ) - { - e->outIdx = OKIdx; - e->side = side; - break; - } - e = e->nextInAEL; - } - - for (JoinList::size_type i = 0; i < m_Joins.size(); ++i) - { - if (m_Joins[i]->poly1Idx == ObsoleteIdx) m_Joins[i]->poly1Idx = OKIdx; - if (m_Joins[i]->poly2Idx == ObsoleteIdx) m_Joins[i]->poly2Idx = OKIdx; - } - - for (HorzJoinList::size_type i = 0; i < m_HorizJoins.size(); ++i) - { - if (m_HorizJoins[i]->savedIdx == ObsoleteIdx) - m_HorizJoins[i]->savedIdx = OKIdx; - } - -} -//------------------------------------------------------------------------------ - -OutRec* Clipper::CreateOutRec() -{ - OutRec* result = new OutRec; - result->isHole = false; - result->FirstLeft = 0; - result->AppendLink = 0; - result->pts = 0; - result->bottomPt = 0; - result->sides = esNeither; - result->bottomFlag = 0; - - return result; -} -//------------------------------------------------------------------------------ - -void Clipper::DisposeBottomPt(OutRec &outRec) -{ - OutPt* next = outRec.bottomPt->next; - OutPt* prev = outRec.bottomPt->prev; - if (outRec.pts == outRec.bottomPt) outRec.pts = next; - delete outRec.bottomPt; - next->prev = prev; - prev->next = next; - outRec.bottomPt = next; - FixupOutPolygon(outRec); -} -//------------------------------------------------------------------------------ - -void Clipper::AddOutPt(TEdge *e, const IntPoint &pt) -{ - bool ToFront = (e->side == esLeft); - if( e->outIdx < 0 ) - { - OutRec *outRec = CreateOutRec(); - m_PolyOuts.push_back(outRec); - outRec->idx = (int)m_PolyOuts.size()-1; - e->outIdx = outRec->idx; - OutPt* op = new OutPt; - outRec->pts = op; - outRec->bottomPt = op; - op->pt = pt; - op->idx = outRec->idx; - op->next = op; - op->prev = op; - SetHoleState(e, outRec); - } else - { - OutRec *outRec = m_PolyOuts[e->outIdx]; - OutPt* op = outRec->pts; - if ((ToFront && PointsEqual(pt, op->pt)) || - (!ToFront && PointsEqual(pt, op->prev->pt))) return; - - if ((e->side | outRec->sides) != outRec->sides) - { - //check for 'rounding' artefacts ... - if (outRec->sides == esNeither && pt.Y == op->pt.Y) - { - if (ToFront) - { - if (pt.X == op->pt.X +1) return; //ie wrong side of bottomPt - } - else if (pt.X == op->pt.X -1) return; //ie wrong side of bottomPt - } - - outRec->sides = (EdgeSide)(outRec->sides | e->side); - if (outRec->sides == esBoth) - { - //A vertex from each side has now been added. - //Vertices of one side of an output polygon are quite commonly close to - //or even 'touching' edges of the other side of the output polygon. - //Very occasionally vertices from one side can 'cross' an edge on the - //the other side. The distance 'crossed' is always less that a unit - //and is purely an artefact of coordinate rounding. Nevertheless, this - //results in very tiny self-intersections. Because of the way - //orientation is calculated, even tiny self-intersections can cause - //the Orientation function to return the wrong result. Therefore, it's - //important to ensure that any self-intersections close to BottomPt are - //detected and removed before orientation is assigned. - - OutPt *opBot, *op2; - if (ToFront) - { - opBot = outRec->pts; - op2 = opBot->next; //op2 == right side - if (opBot->pt.Y != op2->pt.Y && opBot->pt.Y != pt.Y && - ((opBot->pt.X - pt.X)/(opBot->pt.Y - pt.Y) < - (opBot->pt.X - op2->pt.X)/(opBot->pt.Y - op2->pt.Y))) - outRec->bottomFlag = opBot; - } else - { - opBot = outRec->pts->prev; - op2 = opBot->prev; //op2 == left side - if (opBot->pt.Y != op2->pt.Y && opBot->pt.Y != pt.Y && - ((opBot->pt.X - pt.X)/(opBot->pt.Y - pt.Y) > - (opBot->pt.X - op2->pt.X)/(opBot->pt.Y - op2->pt.Y))) - outRec->bottomFlag = opBot; - } - } - } - - OutPt* op2 = new OutPt; - op2->pt = pt; - op2->idx = outRec->idx; - if (op2->pt.Y == outRec->bottomPt->pt.Y && - op2->pt.X < outRec->bottomPt->pt.X) - outRec->bottomPt = op2; - op2->next = op; - op2->prev = op->prev; - op2->prev->next = op2; - op->prev = op2; - if (ToFront) outRec->pts = op2; - } -} -//------------------------------------------------------------------------------ - -void Clipper::ProcessHorizontals() -{ - TEdge* horzEdge = m_SortedEdges; - while( horzEdge ) - { - DeleteFromSEL( horzEdge ); - ProcessHorizontal( horzEdge ); - horzEdge = m_SortedEdges; - } -} -//------------------------------------------------------------------------------ - -bool Clipper::IsTopHorz(const long64 XPos) -{ - TEdge* e = m_SortedEdges; - while( e ) - { - if( ( XPos >= std::min(e->xcurr, e->xtop) ) && - ( XPos <= std::max(e->xcurr, e->xtop) ) ) return false; - e = e->nextInSEL; - } - return true; -} -//------------------------------------------------------------------------------ - -bool IsMinima(TEdge *e) -{ - return e && (e->prev->nextInLML != e) && (e->next->nextInLML != e); -} -//------------------------------------------------------------------------------ - -bool IsMaxima(TEdge *e, const long64 Y) -{ - return e && e->ytop == Y && !e->nextInLML; -} -//------------------------------------------------------------------------------ - -bool IsIntermediate(TEdge *e, const long64 Y) -{ - return e->ytop == Y && e->nextInLML; -} -//------------------------------------------------------------------------------ - -TEdge *GetMaximaPair(TEdge *e) -{ - if( !IsMaxima(e->next, e->ytop) || e->next->xtop != e->xtop ) - return e->prev; else - return e->next; -} -//------------------------------------------------------------------------------ - -void Clipper::SwapPositionsInAEL(TEdge *edge1, TEdge *edge2) -{ - if( !edge1->nextInAEL && !edge1->prevInAEL ) return; - if( !edge2->nextInAEL && !edge2->prevInAEL ) return; - - if( edge1->nextInAEL == edge2 ) - { - TEdge* next = edge2->nextInAEL; - if( next ) next->prevInAEL = edge1; - TEdge* prev = edge1->prevInAEL; - if( prev ) prev->nextInAEL = edge2; - edge2->prevInAEL = prev; - edge2->nextInAEL = edge1; - edge1->prevInAEL = edge2; - edge1->nextInAEL = next; - } - else if( edge2->nextInAEL == edge1 ) - { - TEdge* next = edge1->nextInAEL; - if( next ) next->prevInAEL = edge2; - TEdge* prev = edge2->prevInAEL; - if( prev ) prev->nextInAEL = edge1; - edge1->prevInAEL = prev; - edge1->nextInAEL = edge2; - edge2->prevInAEL = edge1; - edge2->nextInAEL = next; - } - else - { - TEdge* next = edge1->nextInAEL; - TEdge* prev = edge1->prevInAEL; - edge1->nextInAEL = edge2->nextInAEL; - if( edge1->nextInAEL ) edge1->nextInAEL->prevInAEL = edge1; - edge1->prevInAEL = edge2->prevInAEL; - if( edge1->prevInAEL ) edge1->prevInAEL->nextInAEL = edge1; - edge2->nextInAEL = next; - if( edge2->nextInAEL ) edge2->nextInAEL->prevInAEL = edge2; - edge2->prevInAEL = prev; - if( edge2->prevInAEL ) edge2->prevInAEL->nextInAEL = edge2; - } - - if( !edge1->prevInAEL ) m_ActiveEdges = edge1; - else if( !edge2->prevInAEL ) m_ActiveEdges = edge2; -} -//------------------------------------------------------------------------------ - -void Clipper::SwapPositionsInSEL(TEdge *edge1, TEdge *edge2) -{ - if( !( edge1->nextInSEL ) && !( edge1->prevInSEL ) ) return; - if( !( edge2->nextInSEL ) && !( edge2->prevInSEL ) ) return; - - if( edge1->nextInSEL == edge2 ) - { - TEdge* next = edge2->nextInSEL; - if( next ) next->prevInSEL = edge1; - TEdge* prev = edge1->prevInSEL; - if( prev ) prev->nextInSEL = edge2; - edge2->prevInSEL = prev; - edge2->nextInSEL = edge1; - edge1->prevInSEL = edge2; - edge1->nextInSEL = next; - } - else if( edge2->nextInSEL == edge1 ) - { - TEdge* next = edge1->nextInSEL; - if( next ) next->prevInSEL = edge2; - TEdge* prev = edge2->prevInSEL; - if( prev ) prev->nextInSEL = edge1; - edge1->prevInSEL = prev; - edge1->nextInSEL = edge2; - edge2->prevInSEL = edge1; - edge2->nextInSEL = next; - } - else - { - TEdge* next = edge1->nextInSEL; - TEdge* prev = edge1->prevInSEL; - edge1->nextInSEL = edge2->nextInSEL; - if( edge1->nextInSEL ) edge1->nextInSEL->prevInSEL = edge1; - edge1->prevInSEL = edge2->prevInSEL; - if( edge1->prevInSEL ) edge1->prevInSEL->nextInSEL = edge1; - edge2->nextInSEL = next; - if( edge2->nextInSEL ) edge2->nextInSEL->prevInSEL = edge2; - edge2->prevInSEL = prev; - if( edge2->prevInSEL ) edge2->prevInSEL->nextInSEL = edge2; - } - - if( !edge1->prevInSEL ) m_SortedEdges = edge1; - else if( !edge2->prevInSEL ) m_SortedEdges = edge2; -} -//------------------------------------------------------------------------------ - -TEdge* GetNextInAEL(TEdge *e, Direction dir) -{ - return dir == dLeftToRight ? e->nextInAEL : e->prevInAEL; -} -//------------------------------------------------------------------------------ - -void Clipper::ProcessHorizontal(TEdge *horzEdge) -{ - Direction dir; - long64 horzLeft, horzRight; - - if( horzEdge->xcurr < horzEdge->xtop ) - { - horzLeft = horzEdge->xcurr; - horzRight = horzEdge->xtop; - dir = dLeftToRight; - } else - { - horzLeft = horzEdge->xtop; - horzRight = horzEdge->xcurr; - dir = dRightToLeft; - } - - TEdge* eMaxPair; - if( horzEdge->nextInLML ) eMaxPair = 0; - else eMaxPair = GetMaximaPair(horzEdge); - - TEdge* e = GetNextInAEL( horzEdge , dir ); - while( e ) - { - TEdge* eNext = GetNextInAEL( e, dir ); - - if (eMaxPair || - ((dir == dLeftToRight) && (e->xcurr <= horzRight)) || - ((dir == dRightToLeft) && (e->xcurr >= horzLeft))) - { - //ok, so far it looks like we're still in range of the horizontal edge - if ( e->xcurr == horzEdge->xtop && !eMaxPair ) - { - assert(horzEdge->nextInLML); - if (SlopesEqual(*e, *horzEdge->nextInLML, m_UseFullRange)) - { - //if output polygons share an edge, they'll need joining later ... - if (horzEdge->outIdx >= 0 && e->outIdx >= 0) - AddJoin(horzEdge->nextInLML, e, horzEdge->outIdx); - break; //we've reached the end of the horizontal line - } - else if (e->dx < horzEdge->nextInLML->dx) - //we really have got to the end of the intermediate horz edge so quit. - //nb: More -ve slopes follow more +ve slopes ABOVE the horizontal. - break; - } - - if( e == eMaxPair ) - { - //horzEdge is evidently a maxima horizontal and we've arrived at its end. - if (dir == dLeftToRight) - IntersectEdges(horzEdge, e, IntPoint(e->xcurr, horzEdge->ycurr), ipNone); - else - IntersectEdges(e, horzEdge, IntPoint(e->xcurr, horzEdge->ycurr), ipNone); - if (eMaxPair->outIdx >= 0) throw clipperException("ProcessHorizontal error"); - return; - } - else if( NEAR_EQUAL(e->dx, HORIZONTAL) && !IsMinima(e) && !(e->xcurr > e->xtop) ) - { - //An overlapping horizontal edge. Overlapping horizontal edges are - //processed as if layered with the current horizontal edge (horizEdge) - //being infinitesimally lower that the next (e). Therfore, we - //intersect with e only if e.xcurr is within the bounds of horzEdge ... - if( dir == dLeftToRight ) - IntersectEdges( horzEdge , e, IntPoint(e->xcurr, horzEdge->ycurr), - (IsTopHorz( e->xcurr ))? ipLeft : ipBoth ); - else - IntersectEdges( e, horzEdge, IntPoint(e->xcurr, horzEdge->ycurr), - (IsTopHorz( e->xcurr ))? ipRight : ipBoth ); - } - else if( dir == dLeftToRight ) - { - IntersectEdges( horzEdge, e, IntPoint(e->xcurr, horzEdge->ycurr), - (IsTopHorz( e->xcurr ))? ipLeft : ipBoth ); - } - else - { - IntersectEdges( e, horzEdge, IntPoint(e->xcurr, horzEdge->ycurr), - (IsTopHorz( e->xcurr ))? ipRight : ipBoth ); - } - SwapPositionsInAEL( horzEdge, e ); - } - else if( (dir == dLeftToRight && e->xcurr > horzRight && m_SortedEdges) || - (dir == dRightToLeft && e->xcurr < horzLeft && m_SortedEdges) ) break; - e = eNext; - } //end while - - if( horzEdge->nextInLML ) - { - if( horzEdge->outIdx >= 0 ) - AddOutPt( horzEdge, IntPoint(horzEdge->xtop, horzEdge->ytop)); - UpdateEdgeIntoAEL( horzEdge ); - } - else - { - if ( horzEdge->outIdx >= 0 ) - IntersectEdges( horzEdge, eMaxPair, - IntPoint(horzEdge->xtop, horzEdge->ycurr), ipBoth); - assert(eMaxPair); - if (eMaxPair->outIdx >= 0) throw clipperException("ProcessHorizontal error"); - DeleteFromAEL(eMaxPair); - DeleteFromAEL(horzEdge); - } -} -//------------------------------------------------------------------------------ - -void Clipper::UpdateEdgeIntoAEL(TEdge *&e) -{ - if( !e->nextInLML ) throw - clipperException("UpdateEdgeIntoAEL: invalid call"); - TEdge* AelPrev = e->prevInAEL; - TEdge* AelNext = e->nextInAEL; - e->nextInLML->outIdx = e->outIdx; - if( AelPrev ) AelPrev->nextInAEL = e->nextInLML; - else m_ActiveEdges = e->nextInLML; - if( AelNext ) AelNext->prevInAEL = e->nextInLML; - e->nextInLML->side = e->side; - e->nextInLML->windDelta = e->windDelta; - e->nextInLML->windCnt = e->windCnt; - e->nextInLML->windCnt2 = e->windCnt2; - e = e->nextInLML; - e->prevInAEL = AelPrev; - e->nextInAEL = AelNext; - if( !NEAR_EQUAL(e->dx, HORIZONTAL) ) InsertScanbeam( e->ytop ); -} -//------------------------------------------------------------------------------ - -bool Clipper::ProcessIntersections(const long64 botY, const long64 topY) -{ - if( !m_ActiveEdges ) return true; - try { - BuildIntersectList(botY, topY); - if ( !m_IntersectNodes) return true; - if ( FixupIntersections() ) ProcessIntersectList(); - else return false; - } - catch(...) { - m_SortedEdges = 0; - DisposeIntersectNodes(); - throw clipperException("ProcessIntersections error"); - } - return true; -} -//------------------------------------------------------------------------------ - -void Clipper::DisposeIntersectNodes() -{ - while ( m_IntersectNodes ) - { - IntersectNode* iNode = m_IntersectNodes->next; - delete m_IntersectNodes; - m_IntersectNodes = iNode; - } -} -//------------------------------------------------------------------------------ - -void Clipper::BuildIntersectList(const long64 botY, const long64 topY) -{ - if ( !m_ActiveEdges ) return; - - //prepare for sorting ... - TEdge* e = m_ActiveEdges; - e->tmpX = TopX( *e, topY ); - m_SortedEdges = e; - m_SortedEdges->prevInSEL = 0; - e = e->nextInAEL; - while( e ) - { - e->prevInSEL = e->prevInAEL; - e->prevInSEL->nextInSEL = e; - e->nextInSEL = 0; - e->tmpX = TopX( *e, topY ); - e = e->nextInAEL; - } - - //bubblesort ... - bool isModified = true; - while( isModified && m_SortedEdges ) - { - isModified = false; - e = m_SortedEdges; - while( e->nextInSEL ) - { - TEdge *eNext = e->nextInSEL; - IntPoint pt; - if(e->tmpX > eNext->tmpX && - IntersectPoint(*e, *eNext, pt, m_UseFullRange)) - { - if (pt.Y > botY) - { - pt.Y = botY; - pt.X = TopX(*e, pt.Y); - } - AddIntersectNode( e, eNext, pt ); - SwapPositionsInSEL(e, eNext); - isModified = true; - } - else - e = eNext; - } - if( e->prevInSEL ) e->prevInSEL->nextInSEL = 0; - else break; - } - m_SortedEdges = 0; -} -//------------------------------------------------------------------------------ - -bool ProcessParam1BeforeParam2(IntersectNode &node1, IntersectNode &node2) -{ - bool result; - if (node1.pt.Y == node2.pt.Y) - { - if (node1.edge1 == node2.edge1 || node1.edge2 == node2.edge1) - { - result = node2.pt.X > node1.pt.X; - return node2.edge1->dx > 0 ? !result : result; - } - else if (node1.edge1 == node2.edge2 || node1.edge2 == node2.edge2) - { - result = node2.pt.X > node1.pt.X; - return node2.edge2->dx > 0 ? !result : result; - } - else return node2.pt.X > node1.pt.X; - } - else return node1.pt.Y > node2.pt.Y; -} -//------------------------------------------------------------------------------ - -void Clipper::AddIntersectNode(TEdge *e1, TEdge *e2, const IntPoint &pt) -{ - IntersectNode* newNode = new IntersectNode; - newNode->edge1 = e1; - newNode->edge2 = e2; - newNode->pt = pt; - newNode->next = 0; - if( !m_IntersectNodes ) m_IntersectNodes = newNode; - else if( ProcessParam1BeforeParam2(*newNode, *m_IntersectNodes) ) - { - newNode->next = m_IntersectNodes; - m_IntersectNodes = newNode; - } - else - { - IntersectNode* iNode = m_IntersectNodes; - while( iNode->next && ProcessParam1BeforeParam2(*iNode->next, *newNode) ) - iNode = iNode->next; - newNode->next = iNode->next; - iNode->next = newNode; - } -} -//------------------------------------------------------------------------------ - -void Clipper::ProcessIntersectList() -{ - while( m_IntersectNodes ) - { - IntersectNode* iNode = m_IntersectNodes->next; - { - IntersectEdges( m_IntersectNodes->edge1 , - m_IntersectNodes->edge2 , m_IntersectNodes->pt, ipBoth ); - SwapPositionsInAEL( m_IntersectNodes->edge1 , m_IntersectNodes->edge2 ); - } - delete m_IntersectNodes; - m_IntersectNodes = iNode; - } -} -//------------------------------------------------------------------------------ - -void Clipper::DoMaxima(TEdge *e, long64 topY) -{ - TEdge* eMaxPair = GetMaximaPair(e); - long64 X = e->xtop; - TEdge* eNext = e->nextInAEL; - while( eNext != eMaxPair ) - { - if (!eNext) throw clipperException("DoMaxima error"); - IntersectEdges( e, eNext, IntPoint(X, topY), ipBoth ); - eNext = eNext->nextInAEL; - } - if( e->outIdx < 0 && eMaxPair->outIdx < 0 ) - { - DeleteFromAEL( e ); - DeleteFromAEL( eMaxPair ); - } - else if( e->outIdx >= 0 && eMaxPair->outIdx >= 0 ) - { - IntersectEdges( e, eMaxPair, IntPoint(X, topY), ipNone ); - } - else throw clipperException("DoMaxima error"); -} -//------------------------------------------------------------------------------ - -void Clipper::ProcessEdgesAtTopOfScanbeam(const long64 topY) -{ - TEdge* e = m_ActiveEdges; - while( e ) - { - //1. process maxima, treating them as if they're 'bent' horizontal edges, - // but exclude maxima with horizontal edges. nb: e can't be a horizontal. - if( IsMaxima(e, topY) && !NEAR_EQUAL(GetMaximaPair(e)->dx, HORIZONTAL) ) - { - //'e' might be removed from AEL, as may any following edges so ... - TEdge* ePrior = e->prevInAEL; - DoMaxima(e, topY); - if( !ePrior ) e = m_ActiveEdges; - else e = ePrior->nextInAEL; - } - else - { - //2. promote horizontal edges, otherwise update xcurr and ycurr ... - if( IsIntermediate(e, topY) && NEAR_EQUAL(e->nextInLML->dx, HORIZONTAL) ) - { - if (e->outIdx >= 0) - { - AddOutPt(e, IntPoint(e->xtop, e->ytop)); - - for (HorzJoinList::size_type i = 0; i < m_HorizJoins.size(); ++i) - { - IntPoint pt, pt2; - HorzJoinRec* hj = m_HorizJoins[i]; - if (GetOverlapSegment(IntPoint(hj->edge->xbot, hj->edge->ybot), - IntPoint(hj->edge->xtop, hj->edge->ytop), - IntPoint(e->nextInLML->xbot, e->nextInLML->ybot), - IntPoint(e->nextInLML->xtop, e->nextInLML->ytop), pt, pt2)) - AddJoin(hj->edge, e->nextInLML, hj->savedIdx, e->outIdx); - } - - AddHorzJoin(e->nextInLML, e->outIdx); - } - UpdateEdgeIntoAEL(e); - AddEdgeToSEL(e); - } else - { - //this just simplifies horizontal processing ... - e->xcurr = TopX( *e, topY ); - e->ycurr = topY; - } - e = e->nextInAEL; - } - } - - //3. Process horizontals at the top of the scanbeam ... - ProcessHorizontals(); - - //4. Promote intermediate vertices ... - e = m_ActiveEdges; - while( e ) - { - if( IsIntermediate( e, topY ) ) - { - if( e->outIdx >= 0 ) AddOutPt(e, IntPoint(e->xtop,e->ytop)); - UpdateEdgeIntoAEL(e); - - //if output polygons share an edge, they'll need joining later ... - if (e->outIdx >= 0 && e->prevInAEL && e->prevInAEL->outIdx >= 0 && - e->prevInAEL->xcurr == e->xbot && e->prevInAEL->ycurr == e->ybot && - SlopesEqual(IntPoint(e->xbot,e->ybot), IntPoint(e->xtop, e->ytop), - IntPoint(e->xbot,e->ybot), - IntPoint(e->prevInAEL->xtop, e->prevInAEL->ytop), m_UseFullRange)) - { - AddOutPt(e->prevInAEL, IntPoint(e->xbot, e->ybot)); - AddJoin(e, e->prevInAEL); - } - else if (e->outIdx >= 0 && e->nextInAEL && e->nextInAEL->outIdx >= 0 && - e->nextInAEL->ycurr > e->nextInAEL->ytop && - e->nextInAEL->ycurr <= e->nextInAEL->ybot && - e->nextInAEL->xcurr == e->xbot && e->nextInAEL->ycurr == e->ybot && - SlopesEqual(IntPoint(e->xbot,e->ybot), IntPoint(e->xtop, e->ytop), - IntPoint(e->xbot,e->ybot), - IntPoint(e->nextInAEL->xtop, e->nextInAEL->ytop), m_UseFullRange)) - { - AddOutPt(e->nextInAEL, IntPoint(e->xbot, e->ybot)); - AddJoin(e, e->nextInAEL); - } - } - e = e->nextInAEL; - } -} -//------------------------------------------------------------------------------ - -void Clipper::FixupOutPolygon(OutRec &outRec) -{ - //FixupOutPolygon() - removes duplicate points and simplifies consecutive - //parallel edges by removing the middle vertex. - OutPt *lastOK = 0; - outRec.pts = outRec.bottomPt; - OutPt *pp = outRec.bottomPt; - - for (;;) - { - if (pp->prev == pp || pp->prev == pp->next ) - { - DisposeOutPts(pp); - outRec.pts = 0; - outRec.bottomPt = 0; - return; - } - //test for duplicate points and for same slope (cross-product) ... - if ( PointsEqual(pp->pt, pp->next->pt) || - SlopesEqual(pp->prev->pt, pp->pt, pp->next->pt, m_UseFullRange) ) - { - lastOK = 0; - OutPt *tmp = pp; - if (pp == outRec.bottomPt) - outRec.bottomPt = 0; //flags need for updating - pp->prev->next = pp->next; - pp->next->prev = pp->prev; - pp = pp->prev; - delete tmp; - } - else if (pp == lastOK) break; - else - { - if (!lastOK) lastOK = pp; - pp = pp->next; - } - } - if (!outRec.bottomPt) { - outRec.bottomPt = GetBottomPt(pp); - outRec.bottomPt->idx = outRec.idx; - outRec.pts = outRec.bottomPt; - } -} -//------------------------------------------------------------------------------ - -void Clipper::BuildResult(Polygons &polys) -{ - int k = 0; - polys.resize(m_PolyOuts.size()); - for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i) - { - if (m_PolyOuts[i]->pts) - { - Polygon* pg = &polys[k]; - pg->clear(); - OutPt* p = m_PolyOuts[i]->pts; - do - { - pg->push_back(p->pt); - p = p->next; - } while (p != m_PolyOuts[i]->pts); - //make sure each polygon has at least 3 vertices ... - if (pg->size() < 3) pg->clear(); else k++; - } - } - polys.resize(k); -} -//------------------------------------------------------------------------------ - -void Clipper::BuildResultEx(ExPolygons &polys) -{ - PolyOutList::size_type i = 0; - int k = 0; - polys.resize(0); - polys.reserve(m_PolyOuts.size()); - while (i < m_PolyOuts.size() && m_PolyOuts[i]->pts) - { - ExPolygon epg; - OutPt* p = m_PolyOuts[i]->pts; - do { - epg.outer.push_back(p->pt); - p = p->next; - } while (p != m_PolyOuts[i]->pts); - i++; - //make sure polygons have at least 3 vertices ... - if (epg.outer.size() < 3) continue; - while (i < m_PolyOuts.size() - && m_PolyOuts[i]->pts && m_PolyOuts[i]->isHole) - { - Polygon pg; - p = m_PolyOuts[i]->pts; - do { - pg.push_back(p->pt); - p = p->next; - } while (p != m_PolyOuts[i]->pts); - epg.holes.push_back(pg); - i++; - } - polys.push_back(epg); - k++; - } - polys.resize(k); -} -//------------------------------------------------------------------------------ - -void SwapIntersectNodes(IntersectNode &int1, IntersectNode &int2) -{ - TEdge *e1 = int1.edge1; - TEdge *e2 = int1.edge2; - IntPoint p = int1.pt; - - int1.edge1 = int2.edge1; - int1.edge2 = int2.edge2; - int1.pt = int2.pt; - - int2.edge1 = e1; - int2.edge2 = e2; - int2.pt = p; -} -//------------------------------------------------------------------------------ - -bool Clipper::FixupIntersections() -{ - if ( !m_IntersectNodes->next ) return true; - - CopyAELToSEL(); - IntersectNode *int1 = m_IntersectNodes; - IntersectNode *int2 = m_IntersectNodes->next; - while (int2) - { - TEdge *e1 = int1->edge1; - TEdge *e2; - if (e1->prevInSEL == int1->edge2) e2 = e1->prevInSEL; - else if (e1->nextInSEL == int1->edge2) e2 = e1->nextInSEL; - else - { - //The current intersection is out of order, so try and swap it with - //a subsequent intersection ... - while (int2) - { - if (int2->edge1->nextInSEL == int2->edge2 || - int2->edge1->prevInSEL == int2->edge2) break; - else int2 = int2->next; - } - if ( !int2 ) return false; //oops!!! - - //found an intersect node that can be swapped ... - SwapIntersectNodes(*int1, *int2); - e1 = int1->edge1; - e2 = int1->edge2; - } - SwapPositionsInSEL(e1, e2); - int1 = int1->next; - int2 = int1->next; - } - - m_SortedEdges = 0; - - //finally, check the last intersection too ... - return (int1->edge1->prevInSEL == int1->edge2 || - int1->edge1->nextInSEL == int1->edge2); -} -//------------------------------------------------------------------------------ - -bool E2InsertsBeforeE1(TEdge &e1, TEdge &e2) -{ - return e2.xcurr == e1.xcurr ? e2.dx > e1.dx : e2.xcurr < e1.xcurr; -} -//------------------------------------------------------------------------------ - -void Clipper::InsertEdgeIntoAEL(TEdge *edge) -{ - edge->prevInAEL = 0; - edge->nextInAEL = 0; - if( !m_ActiveEdges ) - { - m_ActiveEdges = edge; - } - else if( E2InsertsBeforeE1(*m_ActiveEdges, *edge) ) - { - edge->nextInAEL = m_ActiveEdges; - m_ActiveEdges->prevInAEL = edge; - m_ActiveEdges = edge; - } else - { - TEdge* e = m_ActiveEdges; - while( e->nextInAEL && !E2InsertsBeforeE1(*e->nextInAEL , *edge) ) - e = e->nextInAEL; - edge->nextInAEL = e->nextInAEL; - if( e->nextInAEL ) e->nextInAEL->prevInAEL = edge; - edge->prevInAEL = e; - e->nextInAEL = edge; - } -} -//---------------------------------------------------------------------- - -void Clipper::DoEdge1(TEdge *edge1, TEdge *edge2, const IntPoint &pt) -{ - AddOutPt(edge1, pt); - SwapSides(*edge1, *edge2); - SwapPolyIndexes(*edge1, *edge2); -} -//---------------------------------------------------------------------- - -void Clipper::DoEdge2(TEdge *edge1, TEdge *edge2, const IntPoint &pt) -{ - AddOutPt(edge2, pt); - SwapSides(*edge1, *edge2); - SwapPolyIndexes(*edge1, *edge2); -} -//---------------------------------------------------------------------- - -void Clipper::DoBothEdges(TEdge *edge1, TEdge *edge2, const IntPoint &pt) -{ - AddOutPt(edge1, pt); - AddOutPt(edge2, pt); - SwapSides( *edge1 , *edge2 ); - SwapPolyIndexes( *edge1 , *edge2 ); -} -//---------------------------------------------------------------------- - -void Clipper::CheckHoleLinkages1(OutRec *outRec1, OutRec *outRec2) -{ - //when a polygon is split into 2 polygons, make sure any holes the original - //polygon contained link to the correct polygon ... - for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i) - { - OutRec *orec = m_PolyOuts[i]; - if (orec->isHole && orec->bottomPt && orec->FirstLeft == outRec1 && - !PointInPolygon(orec->bottomPt->pt, outRec1->pts, m_UseFullRange)) - orec->FirstLeft = outRec2; - } -} -//---------------------------------------------------------------------- - -void Clipper::CheckHoleLinkages2(OutRec *outRec1, OutRec *outRec2) -{ - //if a hole is owned by outRec2 then make it owned by outRec1 ... - for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i) - if (m_PolyOuts[i]->isHole && m_PolyOuts[i]->bottomPt && - m_PolyOuts[i]->FirstLeft == outRec2) - m_PolyOuts[i]->FirstLeft = outRec1; -} -//---------------------------------------------------------------------- - -void Clipper::JoinCommonEdges(bool fixHoleLinkages) -{ - for (JoinList::size_type i = 0; i < m_Joins.size(); i++) - { - JoinRec* j = m_Joins[i]; - OutRec *outRec1 = m_PolyOuts[j->poly1Idx]; - OutPt *pp1a = outRec1->pts; - OutRec *outRec2 = m_PolyOuts[j->poly2Idx]; - OutPt *pp2a = outRec2->pts; - IntPoint pt1 = j->pt2a, pt2 = j->pt2b; - IntPoint pt3 = j->pt1a, pt4 = j->pt1b; - if (!FindSegment(pp1a, pt1, pt2)) continue; - if (j->poly1Idx == j->poly2Idx) - { - //we're searching the same polygon for overlapping segments so - //segment 2 mustn't be the same as segment 1 ... - pp2a = pp1a->next; - if (!FindSegment(pp2a, pt3, pt4) || (pp2a == pp1a)) continue; - } - else if (!FindSegment(pp2a, pt3, pt4)) continue; - - if (!GetOverlapSegment(pt1, pt2, pt3, pt4, pt1, pt2)) continue; - - OutPt *p1, *p2, *p3, *p4; - OutPt *prev = pp1a->prev; - //get p1 & p2 polypts - the overlap start & endpoints on poly1 - if (PointsEqual(pp1a->pt, pt1)) p1 = pp1a; - else if (PointsEqual(prev->pt, pt1)) p1 = prev; - else p1 = InsertPolyPtBetween(pp1a, prev, pt1); - - if (PointsEqual(pp1a->pt, pt2)) p2 = pp1a; - else if (PointsEqual(prev->pt, pt2)) p2 = prev; - else if ((p1 == pp1a) || (p1 == prev)) - p2 = InsertPolyPtBetween(pp1a, prev, pt2); - else if (Pt3IsBetweenPt1AndPt2(pp1a->pt, p1->pt, pt2)) - p2 = InsertPolyPtBetween(pp1a, p1, pt2); else - p2 = InsertPolyPtBetween(p1, prev, pt2); - - //get p3 & p4 polypts - the overlap start & endpoints on poly2 - prev = pp2a->prev; - if (PointsEqual(pp2a->pt, pt1)) p3 = pp2a; - else if (PointsEqual(prev->pt, pt1)) p3 = prev; - else p3 = InsertPolyPtBetween(pp2a, prev, pt1); - - if (PointsEqual(pp2a->pt, pt2)) p4 = pp2a; - else if (PointsEqual(prev->pt, pt2)) p4 = prev; - else if ((p3 == pp2a) || (p3 == prev)) - p4 = InsertPolyPtBetween(pp2a, prev, pt2); - else if (Pt3IsBetweenPt1AndPt2(pp2a->pt, p3->pt, pt2)) - p4 = InsertPolyPtBetween(pp2a, p3, pt2); else - p4 = InsertPolyPtBetween(p3, prev, pt2); - - //p1.pt == p3.pt and p2.pt == p4.pt so join p1 to p3 and p2 to p4 ... - if (p1->next == p2 && p3->prev == p4) - { - p1->next = p3; - p3->prev = p1; - p2->prev = p4; - p4->next = p2; - } - else if (p1->prev == p2 && p3->next == p4) - { - p1->prev = p3; - p3->next = p1; - p2->next = p4; - p4->prev = p2; - } - else - continue; //an orientation is probably wrong - - if (j->poly2Idx == j->poly1Idx) - { - //instead of joining two polygons, we've just created a new one by - //splitting one polygon into two. - outRec1->pts = GetBottomPt(p1); - outRec1->bottomPt = outRec1->pts; - outRec1->bottomPt->idx = outRec1->idx; - outRec2 = CreateOutRec(); - m_PolyOuts.push_back(outRec2); - outRec2->idx = (int)m_PolyOuts.size()-1; - j->poly2Idx = outRec2->idx; - outRec2->pts = GetBottomPt(p2); - outRec2->bottomPt = outRec2->pts; - outRec2->bottomPt->idx = outRec2->idx; - - if (PointInPolygon(outRec2->pts->pt, outRec1->pts, m_UseFullRange)) - { - //outRec2 is contained by outRec1 ... - outRec2->isHole = !outRec1->isHole; - outRec2->FirstLeft = outRec1; - if (outRec2->isHole == - (m_ReverseOutput ^ Orientation(outRec2, m_UseFullRange))) - ReversePolyPtLinks(*outRec2->pts); - } else if (PointInPolygon(outRec1->pts->pt, outRec2->pts, m_UseFullRange)) - { - //outRec1 is contained by outRec2 ... - outRec2->isHole = outRec1->isHole; - outRec1->isHole = !outRec2->isHole; - outRec2->FirstLeft = outRec1->FirstLeft; - outRec1->FirstLeft = outRec2; - if (outRec1->isHole == - (m_ReverseOutput ^ Orientation(outRec1, m_UseFullRange))) - ReversePolyPtLinks(*outRec1->pts); - //make sure any contained holes now link to the correct polygon ... - if (fixHoleLinkages) CheckHoleLinkages1(outRec1, outRec2); - } else - { - outRec2->isHole = outRec1->isHole; - outRec2->FirstLeft = outRec1->FirstLeft; - //make sure any contained holes now link to the correct polygon ... - if (fixHoleLinkages) CheckHoleLinkages1(outRec1, outRec2); - } - - //now fixup any subsequent joins that match this polygon - for (JoinList::size_type k = i+1; k < m_Joins.size(); k++) - { - JoinRec* j2 = m_Joins[k]; - if (j2->poly1Idx == j->poly1Idx && PointIsVertex(j2->pt1a, p2)) - j2->poly1Idx = j->poly2Idx; - if (j2->poly2Idx == j->poly1Idx && PointIsVertex(j2->pt2a, p2)) - j2->poly2Idx = j->poly2Idx; - } - - //now cleanup redundant edges too ... - FixupOutPolygon(*outRec1); - FixupOutPolygon(*outRec2); - - if (outRec1->pts && (Orientation(outRec1, m_UseFullRange) != (Area(*outRec1, m_UseFullRange) > 0))) - DisposeBottomPt(*outRec1); - if (outRec2->pts && (Orientation(outRec2, m_UseFullRange) != (Area(*outRec2, m_UseFullRange) > 0))) - DisposeBottomPt(*outRec2); - - } else - { - //joined 2 polygons together ... - - //make sure any holes contained by outRec2 now link to outRec1 ... - if (fixHoleLinkages) CheckHoleLinkages2(outRec1, outRec2); - - //now cleanup redundant edges too ... - FixupOutPolygon(*outRec1); - - if (outRec1->pts) - { - outRec1->isHole = !Orientation(outRec1, m_UseFullRange); - if (outRec1->isHole && !outRec1->FirstLeft) - outRec1->FirstLeft = outRec2->FirstLeft; - } - - //delete the obsolete pointer ... - int OKIdx = outRec1->idx; - int ObsoleteIdx = outRec2->idx; - outRec2->pts = 0; - outRec2->bottomPt = 0; - outRec2->AppendLink = outRec1; - - //now fixup any subsequent Joins that match this polygon - for (JoinList::size_type k = i+1; k < m_Joins.size(); k++) - { - JoinRec* j2 = m_Joins[k]; - if (j2->poly1Idx == ObsoleteIdx) j2->poly1Idx = OKIdx; - if (j2->poly2Idx == ObsoleteIdx) j2->poly2Idx = OKIdx; - } - } - } -} -//------------------------------------------------------------------------------ - -void ReversePolygon(Polygon& p) -{ - std::reverse(p.begin(), p.end()); -} -//------------------------------------------------------------------------------ - -void ReversePolygons(Polygons& p) -{ - for (Polygons::size_type i = 0; i < p.size(); ++i) - ReversePolygon(p[i]); -} - -//------------------------------------------------------------------------------ -// OffsetPolygon functions ... -//------------------------------------------------------------------------------ - -struct DoublePoint -{ - double X; - double Y; - DoublePoint(double x = 0, double y = 0) : X(x), Y(y) {} -}; -//------------------------------------------------------------------------------ - -Polygon BuildArc(const IntPoint &pt, - const double a1, const double a2, const double r) -{ - long64 steps = std::max(6, int(std::sqrt(std::fabs(r)) * std::fabs(a2 - a1))); - if (steps > 0x100000) steps = 0x100000; - int n = (unsigned)steps; - Polygon result(n); - double da = (a2 - a1) / (n -1); - double a = a1; - for (int i = 0; i < n; ++i) - { - result[i].X = pt.X + Round(std::cos(a)*r); - result[i].Y = pt.Y + Round(std::sin(a)*r); - a += da; - } - return result; -} -//------------------------------------------------------------------------------ - -DoublePoint GetUnitNormal( const IntPoint &pt1, const IntPoint &pt2) -{ - if(pt2.X == pt1.X && pt2.Y == pt1.Y) - return DoublePoint(0, 0); - - double dx = (double)(pt2.X - pt1.X); - double dy = (double)(pt2.Y - pt1.Y); - double f = 1 *1.0/ std::sqrt( dx*dx + dy*dy ); - dx *= f; - dy *= f; - return DoublePoint(dy, -dx); -} - -//------------------------------------------------------------------------------ -//------------------------------------------------------------------------------ - -class PolyOffsetBuilder -{ -private: - Polygons m_p; - Polygon* m_curr_poly; - std::vector<DoublePoint> normals; - double m_delta, m_RMin, m_R; - size_t m_i, m_j, m_k; - static const int buffLength = 128; - JoinType m_jointype; - -public: - -PolyOffsetBuilder(const Polygons& in_polys, Polygons& out_polys, - double delta, JoinType jointype, double MiterLimit) -{ - //nb precondition - out_polys != ptsin_polys - if (NEAR_ZERO(delta)) - { - out_polys = in_polys; - return; - } - - this->m_p = in_polys; - this->m_delta = delta; - this->m_jointype = jointype; - if (MiterLimit <= 1) MiterLimit = 1; - m_RMin = 2/(MiterLimit*MiterLimit); - - double deltaSq = delta*delta; - out_polys.clear(); - out_polys.resize(in_polys.size()); - for (m_i = 0; m_i < in_polys.size(); m_i++) - { - m_curr_poly = &out_polys[m_i]; - size_t len = in_polys[m_i].size(); - if (len > 1 && m_p[m_i][0].X == m_p[m_i][len - 1].X && - m_p[m_i][0].Y == m_p[m_i][len-1].Y) len--; - - //when 'shrinking' polygons - to minimize artefacts - //strip those polygons that have an area < pi * delta^2 ... - double a1 = Area(in_polys[m_i]); - if (delta < 0) { if (a1 > 0 && a1 < deltaSq *pi) len = 0; } - else if (a1 < 0 && -a1 < deltaSq *pi) len = 0; //holes have neg. area - - if (len == 0 || (len < 3 && delta <= 0)) - continue; - else if (len == 1) - { - Polygon arc; - arc = BuildArc(in_polys[m_i][len-1], 0, 2 * pi, delta); - out_polys[m_i] = arc; - continue; - } - - //build normals ... - normals.clear(); - normals.resize(len); - normals[len-1] = GetUnitNormal(in_polys[m_i][len-1], in_polys[m_i][0]); - for (m_j = 0; m_j < len -1; ++m_j) - normals[m_j] = GetUnitNormal(in_polys[m_i][m_j], in_polys[m_i][m_j+1]); - - m_k = len -1; - for (m_j = 0; m_j < len; ++m_j) - { - switch (jointype) - { - case jtMiter: - { - m_R = 1 + (normals[m_j].X*normals[m_k].X + - normals[m_j].Y*normals[m_k].Y); - if (m_R >= m_RMin) DoMiter(); else DoSquare(MiterLimit); - break; - } - case jtSquare: DoSquare(); break; - case jtRound: DoRound(); break; - } - m_k = m_j; - } - } - - //finally, clean up untidy corners using Clipper ... - Clipper clpr; - clpr.AddPolygons(out_polys, ptSubject); - if (delta > 0) - { - if (!clpr.Execute(ctUnion, out_polys, pftPositive, pftPositive)) - out_polys.clear(); - } - else - { - IntRect r = clpr.GetBounds(); - Polygon outer(4); - outer[0] = IntPoint(r.left - 10, r.bottom + 10); - outer[1] = IntPoint(r.right + 10, r.bottom + 10); - outer[2] = IntPoint(r.right + 10, r.top - 10); - outer[3] = IntPoint(r.left - 10, r.top - 10); - - clpr.AddPolygon(outer, ptSubject); - if (clpr.Execute(ctUnion, out_polys, pftNegative, pftNegative)) - { - out_polys.erase(out_polys.begin()); - ReversePolygons(out_polys); - - } else - out_polys.clear(); - } -} -//------------------------------------------------------------------------------ - -private: - -void AddPoint(const IntPoint& pt) -{ - Polygon::size_type len = m_curr_poly->size(); - if (len == m_curr_poly->capacity()) - m_curr_poly->reserve(len + buffLength); - m_curr_poly->push_back(pt); -} -//------------------------------------------------------------------------------ - -void DoSquare(double mul = 1.0) -{ - IntPoint pt1 = IntPoint((long64)Round(m_p[m_i][m_j].X + normals[m_k].X * m_delta), - (long64)Round(m_p[m_i][m_j].Y + normals[m_k].Y * m_delta)); - IntPoint pt2 = IntPoint((long64)Round(m_p[m_i][m_j].X + normals[m_j].X * m_delta), - (long64)Round(m_p[m_i][m_j].Y + normals[m_j].Y * m_delta)); - if ((normals[m_k].X * normals[m_j].Y - normals[m_j].X * normals[m_k].Y) * m_delta >= 0) - { - double a1 = std::atan2(normals[m_k].Y, normals[m_k].X); - double a2 = std::atan2(-normals[m_j].Y, -normals[m_j].X); - a1 = std::fabs(a2 - a1); - if (a1 > pi) a1 = pi * 2 - a1; - double dx = std::tan((pi - a1)/4) * std::fabs(m_delta * mul); - pt1 = IntPoint((long64)(pt1.X -normals[m_k].Y * dx), - (long64)(pt1.Y + normals[m_k].X * dx)); - AddPoint(pt1); - pt2 = IntPoint((long64)(pt2.X + normals[m_j].Y * dx), - (long64)(pt2.Y -normals[m_j].X * dx)); - AddPoint(pt2); - } - else - { - AddPoint(pt1); - AddPoint(m_p[m_i][m_j]); - AddPoint(pt2); - } -} -//------------------------------------------------------------------------------ - -void DoMiter() -{ - if ((normals[m_k].X * normals[m_j].Y - normals[m_j].X * normals[m_k].Y) * m_delta >= 0) - { - double q = m_delta / m_R; - AddPoint(IntPoint((long64)Round(m_p[m_i][m_j].X + - (normals[m_k].X + normals[m_j].X) * q), - (long64)Round(m_p[m_i][m_j].Y + (normals[m_k].Y + normals[m_j].Y) * q))); - } - else - { - IntPoint pt1 = IntPoint((long64)Round(m_p[m_i][m_j].X + normals[m_k].X * - m_delta), (long64)Round(m_p[m_i][m_j].Y + normals[m_k].Y * m_delta)); - IntPoint pt2 = IntPoint((long64)Round(m_p[m_i][m_j].X + normals[m_j].X * - m_delta), (long64)Round(m_p[m_i][m_j].Y + normals[m_j].Y * m_delta)); - AddPoint(pt1); - AddPoint(m_p[m_i][m_j]); - AddPoint(pt2); - } -} -//------------------------------------------------------------------------------ - -void DoRound() -{ - IntPoint pt1 = IntPoint((long64)Round(m_p[m_i][m_j].X + normals[m_k].X * m_delta), - (long64)Round(m_p[m_i][m_j].Y + normals[m_k].Y * m_delta)); - IntPoint pt2 = IntPoint((long64)Round(m_p[m_i][m_j].X + normals[m_j].X * m_delta), - (long64)Round(m_p[m_i][m_j].Y + normals[m_j].Y * m_delta)); - AddPoint(pt1); - //round off reflex angles (ie > 180 deg) unless almost flat (ie < ~10deg). - if ((normals[m_k].X*normals[m_j].Y - normals[m_j].X*normals[m_k].Y) * m_delta >= 0) - { - if (normals[m_j].X * normals[m_k].X + normals[m_j].Y * normals[m_k].Y < 0.985) - { - double a1 = std::atan2(normals[m_k].Y, normals[m_k].X); - double a2 = std::atan2(normals[m_j].Y, normals[m_j].X); - if (m_delta > 0 && a2 < a1) a2 += pi *2; - else if (m_delta < 0 && a2 > a1) a2 -= pi *2; - Polygon arc = BuildArc(m_p[m_i][m_j], a1, a2, m_delta); - for (Polygon::size_type m = 0; m < arc.size(); m++) - AddPoint(arc[m]); - } - } - else - AddPoint(m_p[m_i][m_j]); - AddPoint(pt2); -} -//-------------------------------------------------------------------------- - -}; //end PolyOffsetBuilder - -//------------------------------------------------------------------------------ -//------------------------------------------------------------------------------ - -void OffsetPolygons(const Polygons &in_polys, Polygons &out_polys, - double delta, JoinType jointype, double MiterLimit) -{ - if (&out_polys == &in_polys) - { - Polygons poly2(in_polys); - PolyOffsetBuilder(poly2, out_polys, delta, jointype, MiterLimit); - } - else PolyOffsetBuilder(in_polys, out_polys, delta, jointype, MiterLimit); -} -//------------------------------------------------------------------------------ - -void SimplifyPolygon(const Polygon &in_poly, Polygons &out_polys, PolyFillType fillType) -{ - Clipper c; - c.AddPolygon(in_poly, ptSubject); - c.Execute(ctUnion, out_polys, fillType, fillType); -} -//------------------------------------------------------------------------------ - -void SimplifyPolygons(const Polygons &in_polys, Polygons &out_polys, PolyFillType fillType) -{ - Clipper c; - c.AddPolygons(in_polys, ptSubject); - c.Execute(ctUnion, out_polys, fillType, fillType); -} -//------------------------------------------------------------------------------ - -void SimplifyPolygons(Polygons &polys, PolyFillType fillType) -{ - SimplifyPolygons(polys, polys, fillType); -} -//------------------------------------------------------------------------------ - -std::ostream& operator <<(std::ostream &s, IntPoint& p) -{ - s << p.X << ' ' << p.Y << "\n"; - return s; -} -//------------------------------------------------------------------------------ - -std::ostream& operator <<(std::ostream &s, Polygon &p) -{ - for (Polygon::size_type i = 0; i < p.size(); i++) - s << p[i]; - s << "\n"; - return s; -} -//------------------------------------------------------------------------------ - -std::ostream& operator <<(std::ostream &s, Polygons &p) -{ - for (Polygons::size_type i = 0; i < p.size(); i++) - s << p[i]; - s << "\n"; - return s; -} -//------------------------------------------------------------------------------ - -} //ClipperLib namespace |