<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Iterative query</title> <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="../../../index.html" title="Chapter 1. Geometry"> <link rel="up" href="../rtree_examples.html" title="Examples"> <link rel="prev" href="range_adaptors.html" title="Range adaptors"> <link rel="next" href="index_stored_in_shared_memory_using_boost_interprocess.html" title="Index stored in shared memory using Boost.Interprocess"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../../index.html">Home</a></td> <td align="center"><a 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name="geometry.spatial_indexes.rtree_examples.iterative_query"></a><a class="link" href="iterative_query.html" title="Iterative query">Iterative query</a> </h4></div></div></div> <p> </p> <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">point</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">box</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">index</span><span class="special">/</span><span class="identifier">rtree</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> <span class="comment">// just for output</span> <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> <span class="keyword">namespace</span> <span class="identifier">bg</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">;</span> <span class="keyword">namespace</span> <span class="identifier">bgi</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">index</span><span class="special">;</span> <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> <span class="special">{</span> <span class="keyword">typedef</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">point</span><span class="special"><</span><span class="keyword">double</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">cs</span><span class="special">::</span><span class="identifier">cartesian</span><span class="special">></span> <span class="identifier">point</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">point</span> <span class="identifier">value</span><span class="special">;</span> <span class="keyword">typedef</span> <span class="identifier">bgi</span><span class="special">::</span><span class="identifier">rtree</span><span class="special"><</span> <span class="identifier">value</span><span class="special">,</span> <span class="identifier">bgi</span><span class="special">::</span><span class="identifier">linear</span><span class="special"><</span><span class="number">16</span><span class="special">></span> <span class="special">></span> <span class="identifier">rtree_t</span><span class="special">;</span> <span class="comment">// create the rtree using default constructor</span> <span class="identifier">rtree_t</span> <span class="identifier">rtree</span><span class="special">;</span> <span class="comment">// create some values</span> <span class="keyword">for</span> <span class="special">(</span> <span class="keyword">double</span> <span class="identifier">f</span> <span class="special">=</span> <span class="number">0</span> <span class="special">;</span> <span class="identifier">f</span> <span class="special"><</span> <span class="number">10</span> <span class="special">;</span> <span class="identifier">f</span> <span class="special">+=</span> <span class="number">1</span> <span class="special">)</span> <span class="special">{</span> <span class="comment">// insert new value</span> <span class="identifier">rtree</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">point</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span> <span class="identifier">f</span><span class="special">));</span> <span class="special">}</span> <span class="comment">// query point</span> <span class="identifier">point</span> <span class="identifier">pt</span><span class="special">(</span><span class="number">5.1</span><span class="special">,</span> <span class="number">5.1</span><span class="special">);</span> <span class="comment">// iterate over nearest Values</span> <span class="keyword">for</span> <span class="special">(</span> <span class="identifier">rtree_t</span><span class="special">::</span><span class="identifier">const_query_iterator</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">rtree</span><span class="special">.</span><span class="identifier">qbegin</span><span class="special">(</span><span class="identifier">bgi</span><span class="special">::</span><span class="identifier">nearest</span><span class="special">(</span><span class="identifier">pt</span><span class="special">,</span> <span class="number">100</span><span class="special">))</span> <span class="special">;</span> <span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">rtree</span><span class="special">.</span><span class="identifier">qend</span><span class="special">()</span> <span class="special">;</span> <span class="special">++</span><span class="identifier">it</span> <span class="special">)</span> <span class="special">{</span> <span class="keyword">double</span> <span class="identifier">d</span> <span class="special">=</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">pt</span><span class="special">,</span> <span class="special">*</span><span class="identifier">it</span><span class="special">);</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">wkt</span><span class="special">(*</span><span class="identifier">it</span><span class="special">)</span> <span class="special"><<</span> <span class="string">", distance= "</span> <span class="special"><<</span> <span class="identifier">d</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// break if the distance is too big</span> <span class="keyword">if</span> <span class="special">(</span> <span class="identifier">d</span> <span class="special">></span> <span class="number">2</span> <span class="special">)</span> <span class="special">{</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"break!"</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="keyword">break</span><span class="special">;</span> <span class="special">}</span> <span class="special">}</span> <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> <span class="special">}</span> </pre> <p> </p> <h5> <a name="geometry.spatial_indexes.rtree_examples.iterative_query.h0"></a> <span class="phrase"><a name="geometry.spatial_indexes.rtree_examples.iterative_query.expected_results"></a></span><a class="link" href="iterative_query.html#geometry.spatial_indexes.rtree_examples.iterative_query.expected_results">Expected results</a> </h5> <pre class="programlisting"><span class="identifier">POINT</span><span class="special">(</span><span class="number">5</span> <span class="number">5</span><span class="special">),</span> <span class="identifier">distance</span><span class="special">=</span> <span class="number">0.141421</span> <span class="identifier">POINT</span><span class="special">(</span><span class="number">6</span> <span class="number">6</span><span class="special">),</span> <span class="identifier">distance</span><span class="special">=</span> <span class="number">1.27279</span> <span class="identifier">POINT</span><span class="special">(</span><span class="number">4</span> <span class="number">4</span><span class="special">),</span> <span class="identifier">distance</span><span class="special">=</span> <span class="number">1.55563</span> <span class="identifier">POINT</span><span class="special">(</span><span class="number">7</span> <span class="number">7</span><span class="special">),</span> <span class="identifier">distance</span><span class="special">=</span> <span class="number">2.68701</span> <span class="keyword">break</span><span class="special">!</span> </pre> 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