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#ifndef _KSEGMENT_H
#define _KSEGMENT_H
#include <cassert>
#include <cstdlib>
#include <iostream>
#include <bigrational.h>
#include <kratpoly.h>
#include <kpoint2d.h>
#include <kboxco2.h>
#include <kpatch.h>
using namespace std;
class K_POINT2D;
class K_BOXCO2;
class K_SEGMENT
{
friend class K_CURVE;
friend class K_PATCH;
K_POINT2D* start;
K_POINT2D* end;
unsigned long ref_count;
// stream
ostream& output(ostream&) const;
//public:
// constructors, assignment and destructor
// K_SEGMENT()
// constructs a null segment.
K_SEGMENT();
// K_SEGMENT(const K_POINT2D& x, const K_POINT2D& y)
// constructs a segment (x, y].
K_SEGMENT(const K_POINT2D&, const K_POINT2D&);
// K_SEGMENT(K_POINT2D* const x, K_POINT2D* const y)
// constructs a segment (x, y].
K_SEGMENT(K_POINT2D* const, K_POINT2D* const);
K_SEGMENT(const K_SEGMENT&);
K_SEGMENT& operator =(const K_SEGMENT&);
~K_SEGMENT();
// stream
friend ostream& operator <<(ostream&, const K_SEGMENT&);
// primitives
K_SEGMENT reverse() const;
// other functions
// K_BOXCO2 outer_box() const
// returns the outer box for *this.
K_BOXCO2 outer_box() const;
// K_BOXCO2* inner_box() const
// returns a pointer to the inner box for *this.
// returns 0 if the inner box for *this is not well-def'ed.
K_BOXCO2* inner_box() const;
// int contains(K_POINT2D& x)
// returns 1 if x lies inside the inner box of *this,
// 0 if x lies outside the outer box of *this.
// POSSIBLY DOES NOT TERMINATE!
// CAUTION!!! The start point is OUT of the segment whereas
// the end point is IN the segment.
int contains(K_POINT2D& x);
// gen_curve_topo()
friend unsigned long gen_curve_topo_proto(const K_RATPOLY&,
const bigrational&,
const bigrational&,
const bigrational&,
const bigrational&,
K_POINT2D** const,
const unsigned long,
K_POINT2D** const,
const unsigned long,
K_POINT2D** const,
const unsigned long,
K_POINT2D** const,
const unsigned long,
K_POINT2D** const,
const unsigned long,
K_POINT2D** const,
const unsigned long,
K_CURVE**&);
// gen_box(), gen_cyl(), gen_ell(), gen_tor()
friend int get_patch4(const bigrational_vector [4], K_PATCH*&);
friend int get_cyl_cap(const bigrational_vector&,
const bigrational_vector&, const bigrational_vector&,
const bool,
K_PATCH*&);
friend int get_cyl_side(K_RATPOLY* const,
K_RATPOLY* const,
K_RATPOLY* const,
K_RATPOLY* const,
K_RATPOLY* const,
K_PATCH*&);
friend unsigned long get_patches_ell(const bigrational_vector [4],
K_PATCH**&);
friend int get_patch_tor(K_RATPOLY* const,
K_RATPOLY* const,
K_RATPOLY* const,
K_RATPOLY* const,
K_RATPOLY* const,
K_PATCH*&);
};
#endif
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