mirror of https://github.com/CGAL/cgal
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
// ======================================================================
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//
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// Copyright (c) 1997 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release : $CGAL_Revision: CGAL-0.9-I-06 $
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// release_date : $CGAL_Date: 1998/03/11 $
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//
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// file : include/CGAL/Polygon_2.C
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// source :
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// revision : 1.8a
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// revision_date : 13 Mar 1998
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// author(s) : Wieger Wesselink <wieger@cs.ruu.nl>
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//
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// coordinator : Utrecht University
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//
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// ======================================================================
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#include <CGAL/Polygon_2.h>
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//-----------------------------------------------------------------------//
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// operator==
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//-----------------------------------------------------------------------//
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CGAL_BEGIN_NAMESPACE
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template <class Traits_P, class Container1_P, class Container2_P>
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bool operator==( const Polygon_2<Traits_P,Container1_P> &x,
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const Polygon_2<Traits_P,Container2_P> &y )
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{
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CGAL_polygon_precondition( (x.size() != 0) || (y.size() != 0));
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if (x.size() != y.size()) return false;
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typename Polygon_2<Traits_P,Container1_P>::Vertex_const_iterator x_iter =
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x.vertices_begin();
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typename Polygon_2<Traits_P,Container2_P>::Vertex_const_iterator y_iter =
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std::find(y.vertices_begin(), y.vertices_end(), *x.vertices_begin());
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// if y doesn't contain the first point of x ...
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if (y_iter == y.vertices_end()) return false;
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++x_iter;
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++y_iter;
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while (y_iter != y.vertices_end()) {
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if (*x_iter != *y_iter) return false;
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++x_iter;
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++y_iter;
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}
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y_iter = y.vertices_begin();
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while (x_iter != x.vertices_end()) {
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if (*x_iter != *y_iter) return false;
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++x_iter;
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++y_iter;
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}
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return true;
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}
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//-----------------------------------------------------------------------//
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// operator>>
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//-----------------------------------------------------------------------//
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template <class Traits_P, class Container_P>
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std::istream &operator>>(std::istream &is, Polygon_2<Traits_P,Container_P>& p)
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{
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int n; // number of vertices
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is >> n;
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typename Traits_P::Point_2 point;
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for (int i=0; i<n; i++) {
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is >> point;
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p.push_back(point);
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}
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return is;
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}
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//-----------------------------------------------------------------------//
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// operator<<
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//-----------------------------------------------------------------------//
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template <class Traits_P, class Container_P>
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std::ostream &operator<<(std::ostream &os, const Polygon_2<Traits_P,Container_P>& p)
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{
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typename Polygon_2<Traits_P,Container_P>::Vertex_const_iterator i;
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switch(os.iword(IO::mode)) {
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case IO::ASCII :
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os << p.size() << ' ';
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for (i = p.vertices_begin(); i != p.vertices_end(); ++i) {
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os << *i << ' ';
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}
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return os;
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case IO::BINARY :
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os << p.size();
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for (i = p.vertices_begin(); i != p.vertices_end(); ++i) {
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os << *i;
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}
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return os;
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default:
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os << "Polygon_2(" << std::endl;
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for (i = p.vertices_begin(); i != p.vertices_end(); ++i) {
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os << " " << *i << std::endl;
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}
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os << ")" << std::endl;
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return os;
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}
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}
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CGAL_END_NAMESPACE
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//-----------------------------------------------------------------------//
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// transform
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//-----------------------------------------------------------------------//
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#ifdef CGAL_REP_CLASS_DEFINED
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#include <CGAL/Polygon_traits_2.h>
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CGAL_BEGIN_NAMESPACE
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template <class Transformation, class Traits_P, class Container_P>
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Polygon_2<Traits_P,Container_P>
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transform(const Transformation& t, const Polygon_2<Traits_P,Container_P>& p)
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{
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typedef typename Polygon_2<Traits_P,Container_P>::Vertex_const_iterator VI;
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Polygon_2<Traits_P,Container_P> result;
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for (VI i = p.vertices_begin(); i != p.vertices_end(); ++i)
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result.push_back(t(*i));
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return result;
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}
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CGAL_END_NAMESPACE
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#endif // CGAL_REP_CLASS_DEFINED
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