path-intersection.h

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#ifndef LIB2GEOM_SEEN_PATH_INTERSECTION_H
#define LIB2GEOM_SEEN_PATH_INTERSECTION_H
 
#include <2geom/crossing.h>
#include <2geom/path.h>
#include <2geom/sweep-bounds.h>
 
namespace Geom {
 
int winding(Path const &path, Point const &p);
bool path_direction(Path const &p);
 
inline bool contains(Path const & p, Point const &i, bool evenodd = true) {
    return (evenodd ? winding(p, i) % 2 : winding(p, i)) != 0;
}
 
template<typename T>
Crossings curve_sweep(Path const &a, Path const &b) {
    T t;
    Crossings ret;
    std::vector<Rect> bounds_a = bounds(a), bounds_b = bounds(b);
    std::vector<std::vector<unsigned> > ixs = sweep_bounds(bounds_a, bounds_b);
    for(unsigned i = 0; i < a.size(); i++) {
        for(std::vector<unsigned>::iterator jp = ixs[i].begin(); jp != ixs[i].end(); ++jp) {
            Crossings cc = t.crossings(a[i], b[*jp]);
            offset_crossings(cc, i, *jp);
            ret.insert(ret.end(), cc.begin(), cc.end());
        }
    }
    return ret;
}
 
Crossings pair_intersect(Curve const & A, Interval const &Ad,
                    Curve const & B, Interval const &Bd);
Crossings mono_intersect(Curve const & A, Interval const &Ad,
                    Curve const & B, Interval const &Bd);
                    
struct SimpleCrosser : public Crosser<Path> {
    Crossings crossings(Curve const &a, Curve const &b);
    Crossings crossings(Path const &a, Path const &b) override { return curve_sweep<SimpleCrosser>(a, b); }
    CrossingSet crossings(PathVector const &a, PathVector const &b) override { return Crosser<Path>::crossings(a, b); }
};
 
struct MonoCrosser : public Crosser<Path> {
    Crossings crossings(Path const &a, Path const &b) override { return crossings(PathVector(a), PathVector(b))[0]; }
    CrossingSet crossings(PathVector const &a, PathVector const &b) override;
};
 
typedef SimpleCrosser DefaultCrosser;
 
std::vector<double> path_mono_splits(Path const &p);
 
CrossingSet crossings_among(PathVector const & p);
Crossings self_crossings(Path const & a);
 
inline Crossings crossings(Curve const & a, Curve const & b) {
    DefaultCrosser c = DefaultCrosser();
    return c.crossings(a, b);
}
 
inline Crossings crossings(Path const & a, Path const & b) {
    DefaultCrosser c = DefaultCrosser();
    return c.crossings(a, b);
}
 
inline CrossingSet crossings(PathVector const & a, PathVector const & b) {
    DefaultCrosser c = DefaultCrosser();
    return c.crossings(a, b);
}
 
}
 
#endif
 
/*
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*/
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