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Diffstat (limited to 'source/blender/freestyle/intern/geometry/SweepLine.h')
| -rwxr-xr-x | source/blender/freestyle/intern/geometry/SweepLine.h | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/geometry/SweepLine.h b/source/blender/freestyle/intern/geometry/SweepLine.h new file mode 100755 index 00000000000..deecf3c5485 --- /dev/null +++ b/source/blender/freestyle/intern/geometry/SweepLine.h @@ -0,0 +1,325 @@ +// +// Filename : SweepLine.h +// Author(s) : Stephane Grabli +// Purpose : Class to define a Sweep Line +// Date of creation : 29/08/2002 +// +/////////////////////////////////////////////////////////////////////////////// + + +// +// Copyright (C) : Please refer to the COPYRIGHT file distributed +// with this source distribution. +// +// This program is free software; you can redistribute it and/or +// modify it under the terms of the GNU General Public License +// as published by the Free Software Foundation; either version 2 +// of the License, or (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +// +/////////////////////////////////////////////////////////////////////////////// + +#ifndef SWEEPLINE_H +# define SWEEPLINE_H + +# include <list> +# include <vector> + +/*! Class to define the intersection berween two segments*/ +template<class Edge> +class Intersection +{ +public: + + template<class EdgeClass> + Intersection(EdgeClass* eA, real ta, EdgeClass* eB, real tb) + { + EdgeA = eA; + EdgeB = eB; + tA = ta; + tB = tb; + userdata = 0; + } + + Intersection(const Intersection& iBrother) + { + EdgeA = iBrother.EdgeA; + EdgeB = iBrother.EdgeB; + tA = iBrother.tA; + tB = iBrother.tB; + userdata = 0; + } + + /*! returns the parameter giving the + * intersection, for the edge iEdge + */ + real getParameter(Edge *iEdge) + { + if(iEdge == EdgeA) + return tA; + if(iEdge == EdgeB) + return tB; + return 0; + } + +public: + void * userdata; // FIXME + + Edge *EdgeA; // first segment + Edge *EdgeB; // second segment + real tA; // parameter defining the intersection point with respect to the segment EdgeA. + real tB; // parameter defining the intersection point with respect to the segment EdgeB. +}; + + + + + + + + +template<class T, class Point> +class Segment +{ + public: + Segment() + { + } + Segment(T& s, const Point& iA, const Point& iB) + { + _edge = s; + if(iA < iB) + { + A = iA; + B = iB; + _order = true; + } + else + { + A = iB; + B = iA; + _order = false; + } + } + + Segment(Segment<T,Point>& iBrother) + { + _edge = iBrother.edge(); + A = iBrother.A; + B = iBrother.B; + _Intersections = iBrother._Intersections; + _order = iBrother._order; + } + + Segment(const Segment<T,Point>& iBrother) + { + _edge = iBrother._edge; + A = iBrother.A; + B = iBrother.B; + _Intersections = iBrother._Intersections; + _order = iBrother._order; + } + + ~Segment() { + _Intersections.clear(); + } + + inline Point operator[](const unsigned short int& i) const + { + return i%2==0 ? A : B; + } + + inline bool operator==(const Segment<T,Point>& iBrother) + { + if(_edge == iBrother._edge) + return true; + + return false; + } + + /* Adds an intersection for this segment */ + inline void AddIntersection(Intersection<Segment<T,Point> > *i) {_Intersections.push_back(i);} + + /*! Checks for a common vertex with another edge */ + inline bool CommonVertex(const Segment<T,Point>& S, Point& CP) + { + if((A == S[0]) || (A == S[1])) + { + CP = A; + return true; + } + if((B == S[0]) || (B == S[1])) + { + CP = B; + return true; + } + + return false; + } + + inline vector<Intersection<Segment<T,Point> >*>& intersections() {return _Intersections;} + inline bool order() {return _order;} + inline T& edge() {return _edge;} + + private: + T _edge; + Point A; + Point B; + std::vector<Intersection<Segment<T,Point> >*> _Intersections; // list of intersections parameters + bool _order; // true if A and B are in the same order than _edge.A and _edge.B. false otherwise. +}; + +/*! defines a binary function that can be overload + * by the user to specify at each condition + * the intersection between 2 edges must be computed + */ +template<class T1, class T2> +struct binary_rule +{ + binary_rule() {} + template<class T3,class T4> + binary_rule(const binary_rule<T3,T4>& brother) {} + virtual ~binary_rule() {} + + virtual bool operator()(T1&, T2&) + { + return true; + } +}; + + +template<class T,class Point> +class SweepLine +{ +public: + + SweepLine() {} + ~SweepLine() + { + for(typename vector<Intersection<Segment<T,Point> >*>::iterator i=_Intersections.begin(),iend=_Intersections.end(); + i!=iend; + i++) + { + delete (*i); + } + } + + + inline void process(Point& p, + vector<Segment<T,Point>*>& segments, + binary_rule<Segment<T,Point>,Segment<T,Point> >& binrule, + //binary_rule<Segment<T,Point>,Segment<T,Point> >& binrule = binary_rule<Segment<T,Point>,Segment<T,Point> >(), + real epsilon = M_EPSILON + ) + { + // first we remove the segments that need to be removed and then + // we add the segments to add + vector<Segment<T,Point>*> toadd; + typename vector<Segment<T,Point>*>::iterator s, send; + for(s=segments.begin(), send=segments.end(); + s!=send; + s++) + { + if(p == (*(*s))[0]) + toadd.push_back((*s)); + else + remove((*s)); + } + for(s=toadd.begin(), send=toadd.end(); + s!=send; + s++) + { + add((*s), binrule, epsilon); + } + } + + inline void add(Segment<T,Point>* S, + binary_rule<Segment<T,Point>,Segment<T,Point> >& binrule, + //binary_rule<Segment<T,Point>,Segment<T,Point> >& binrule = binary_rule<Segment<T,Point>, Segment<T,Point> >(), + real epsilon + ) + { + real t,u; + Point CP; + Vec2r v0, v1, v2, v3; + if(true == S->order()) + { + v0[0] = ((*S)[0])[0]; + v0[1] = ((*S)[0])[1]; + v1[0] = ((*S)[1])[0]; + v1[1] = ((*S)[1])[1]; + } + else + { + v1[0] = ((*S)[0])[0]; + v1[1] = ((*S)[0])[1]; + v0[0] = ((*S)[1])[0]; + v0[1] = ((*S)[1])[1]; + } + for(typename std::list<Segment<T,Point>* >::iterator s=_set.begin(), send=_set.end(); + s!=send; + s++) + { + Segment<T,Point>* currentS = (*s); + if(true != binrule(*S, *currentS)) + continue; + + if(true == currentS->order()) + { + v2[0] = ((*currentS)[0])[0]; + v2[1] = ((*currentS)[0])[1]; + v3[0] = ((*currentS)[1])[0]; + v3[1] = ((*currentS)[1])[1]; + } + else + { + v3[0] = ((*currentS)[0])[0]; + v3[1] = ((*currentS)[0])[1]; + v2[0] = ((*currentS)[1])[0]; + v2[1] = ((*currentS)[1])[1]; + } + if(S->CommonVertex(*currentS, CP)) + continue; // the two edges have a common vertex->no need to check + + if(GeomUtils::intersect2dSeg2dSegParametric(v0, v1, v2, v3, t, u, epsilon) == GeomUtils::DO_INTERSECT) + { + // create the intersection + Intersection<Segment<T,Point> > * inter = new Intersection<Segment<T,Point> >(S,t,currentS,u); + // add it to the intersections list + _Intersections.push_back(inter); + // add this intersection to the first edge intersections list + S->AddIntersection(inter); + // add this intersection to the second edge intersections list + currentS->AddIntersection(inter); + } + } + // add the added segment to the list of active segments + _set.push_back(S); + } + + inline void remove(Segment<T,Point>* s) + { + if(s->intersections().size() > 0) + _IntersectedEdges.push_back(s); + _set.remove(s); + } + + vector<Segment<T,Point>* >& intersectedEdges() {return _IntersectedEdges;} + vector<Intersection<Segment<T,Point> >*>& intersections() {return _Intersections;} + + +private: + std::list<Segment<T,Point>* > _set; // set of active edges for a given position of the sweep line + std::vector<Segment<T,Point>* > _IntersectedEdges; // the list of intersected edges + std::vector<Intersection<Segment<T,Point> >*> _Intersections; // the list of all intersections. +}; + +#endif // SWEEPLINE_H |