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<div class="headertitle"><div class="title">Kernel_23/intersections.cpp</div></div>
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<div class="contents">
<div class="fragment"><div class="line"><span class="preprocessor">#include <CGAL/Exact_predicates_exact_constructions_kernel.h></span></div>
<div class="line"><span class="preprocessor">#include <CGAL/iterator.h></span></div>
<div class="line"><span class="preprocessor">#include <CGAL/point_generators_2.h></span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <a id="_a0" name="_a0"></a><a class="code hl_class" href="classCGAL_1_1Exact__predicates__exact__constructions__kernel.html">CGAL::Exact_predicates_exact_constructions_kernel</a> K;</div>
<div class="line"><span class="keyword">typedef</span> K::Point_2 Point;</div>
<div class="line"><span class="keyword">typedef</span> K::Segment_2 Segment;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <a id="_a1" name="_a1"></a><a class="code hl_classRef" href="../STL_Extension/classCGAL_1_1Creator__uniform__2.html">CGAL::Creator_uniform_2<double,Point></a> Pt_creator;</div>
<div class="line"><span class="keyword">typedef</span> CGAL::Random_points_on_segment_2<Point,Pt_creator> P1;</div>
<div class="line"><span class="keyword">typedef</span> CGAL::Random_points_on_circle_2<Point,Pt_creator> P2;</div>
<div class="line"><span class="keyword">typedef</span> <a class="code hl_classRef" href="../STL_Extension/classCGAL_1_1Creator__uniform__2.html">CGAL::Creator_uniform_2< Point, Segment></a> Seg_creator;</div>
<div class="line"><span class="keyword">typedef</span> <a id="_a2" name="_a2"></a><a class="code hl_classRef" href="../STL_Extension/classCGAL_1_1Join__input__iterator__2.html">CGAL::Join_input_iterator_2< P1, P2, Seg_creator></a> Seg_iterator;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">struct </span>Intersector{</div>
<div class="line"> <span class="keyword">const</span> Segment& s;</div>
<div class="line"> K::Intersect_2 intersect;</div>
<div class="line"> </div>
<div class="line"> Intersector(<span class="keyword">const</span> Segment& seg): s(seg) {}</div>
<div class="line"> </div>
<div class="line"> <span class="keyword">decltype</span>(<span class="keyword">auto</span>)</div>
<div class="line"> <span class="keyword">operator</span>() ( <span class="keyword">const</span> Segment& other) <span class="keyword">const</span></div>
<div class="line"> {</div>
<div class="line"> <span class="keywordflow">return</span> intersect(s, other);</div>
<div class="line"> }</div>
<div class="line">};</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main()</div>
<div class="line">{</div>
<div class="line"> std::vector<Segment> input;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Prepare point generator for the horizontal segment, length 200.</span></div>
<div class="line"> P1 p1( Point(-100,0), Point(100,0));</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Prepare point generator for random points on circle, radius 250.</span></div>
<div class="line"> P2 p2( 250);</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// Create segments.</span></div>
<div class="line"> Seg_iterator g( p1, p2);</div>
<div class="line"> std::copy_n( g, 200, std::back_inserter(input));</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"> <span class="comment">// splitting results with Dispatch_output_iterator</span></div>
<div class="line"> std::vector<Point> points;</div>
<div class="line"> std::vector<Segment> segments;</div>
<div class="line"> </div>
<div class="line"> <span class="keyword">typedef</span> <a id="_a3" name="_a3"></a><a class="code hl_classRef" href="../STL_Extension/classCGAL_1_1Dispatch__output__iterator.html">CGAL::Dispatch_output_iterator</a><</div>
<div class="line"> std::tuple<Point,Segment>, std::tuple< std::back_insert_iterator<std::vector<Point> >,</div>
<div class="line"> std::back_insert_iterator<std::vector<Segment> > > ></div>
<div class="line"> Dispatcher;</div>
<div class="line"> </div>
<div class="line"> Dispatcher disp = CGAL::dispatch_output<Point,Segment>( std::back_inserter(points),</div>
<div class="line"> std::back_inserter(segments) );</div>
<div class="line"> </div>
<div class="line"> <span class="comment">// intersects the first segment of input with all other segments</span></div>
<div class="line"> <span class="comment">// The resulting points or segments are written in the vectors with the same names</span></div>
<div class="line"> std::transform( input.begin(), input.end(), disp,</div>
<div class="line"> Intersector(input.front()) );</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"> std::cout << <span class="stringliteral">"Point intersections: "</span> << points.size() << std::endl;</div>
<div class="line"> std::cout << <span class="stringliteral">"Segment intersections: "</span> << segments.size() << std::endl;</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="ttc" id="aclassCGAL_1_1Creator__uniform__2_html"><div class="ttname"><a href="../STL_Extension/classCGAL_1_1Creator__uniform__2.html">CGAL::Creator_uniform_2</a></div></div>
<div class="ttc" id="aclassCGAL_1_1Dispatch__output__iterator_html"><div class="ttname"><a href="../STL_Extension/classCGAL_1_1Dispatch__output__iterator.html">CGAL::Dispatch_output_iterator</a></div></div>
<div class="ttc" id="aclassCGAL_1_1Exact__predicates__exact__constructions__kernel_html"><div class="ttname"><a href="classCGAL_1_1Exact__predicates__exact__constructions__kernel.html">CGAL::Exact_predicates_exact_constructions_kernel</a></div><div class="ttdoc">A typedef to a kernel which has the following properties:</div><div class="ttdef"><b>Definition:</b> Exact_predicates_exact_constructions_kernel.h:27</div></div>
<div class="ttc" id="aclassCGAL_1_1Join__input__iterator__2_html"><div class="ttname"><a href="../STL_Extension/classCGAL_1_1Join__input__iterator__2.html">CGAL::Join_input_iterator_2</a></div></div>
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