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<a name="geometry.spatial_indexes.rtree_examples.using_indexablegetter_function_object___storing_indexes_of_external_container_s_elements"></a><a class="link" href="using_indexablegetter_function_object___storing_indexes_of_external_container_s_elements.html" title="Using IndexableGetter function object - storing indexes of external container's elements">Using
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<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="preprocessor">#include</span> <span class="special"><</span><span class="identifier">cmath</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</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">foreach</span><span class="special">.</span><span class="identifier">hpp</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">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Container</span><span class="special">></span>
<span class="keyword">class</span> <span class="identifier">my_indexable</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Container</span><span class="special">::</span><span class="identifier">size_type</span> <span class="identifier">size_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Container</span><span class="special">::</span><span class="identifier">const_reference</span> <span class="identifier">cref</span><span class="special">;</span>
<span class="identifier">Container</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">container</span><span class="special">;</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="keyword">typedef</span> <span class="identifier">cref</span> <span class="identifier">result_type</span><span class="special">;</span>
<span class="keyword">explicit</span> <span class="identifier">my_indexable</span><span class="special">(</span><span class="identifier">Container</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">c</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">container</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span> <span class="special">{}</span>
<span class="identifier">result_type</span> <span class="keyword">operator</span><span class="special">()(</span><span class="identifier">size_t</span> <span class="identifier">i</span><span class="special">)</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">container</span><span class="special">[</span><span class="identifier">i</span><span class="special">];</span> <span class="special">}</span>
<span class="special">};</span>
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">void</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">float</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">bg</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">box</span><span class="special"><</span><span class="identifier">point</span><span class="special">></span> <span class="identifier">box</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">box</span><span class="special">>::</span><span class="identifier">size_type</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">rstar</span><span class="special"><</span><span class="number">16</span><span class="special">,</span> <span class="number">4</span><span class="special">></span> <span class="identifier">parameters</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">my_indexable</span><span class="special"><</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">box</span><span class="special">></span> <span class="special">></span> <span class="identifier">indexable_getter</span><span class="special">;</span>
<span class="comment">// boxes</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">box</span><span class="special">></span> <span class="identifier">boxes</span><span class="special">;</span>
<span class="comment">// create some boxes</span>
<span class="keyword">for</span> <span class="special">(</span> <span class="keyword">unsigned</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span> <span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="number">10</span> <span class="special">;</span> <span class="special">++</span><span class="identifier">i</span> <span class="special">)</span>
<span class="special">{</span>
<span class="comment">// add a box</span>
<span class="identifier">boxes</span><span class="special">.</span><span class="identifier">push_back</span><span class="special">(</span><span class="identifier">box</span><span class="special">(</span><span class="identifier">point</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">i</span><span class="special">),</span> <span class="identifier">point</span><span class="special">(</span><span class="identifier">i</span><span class="special">+</span><span class="number">0.5f</span><span class="special">,</span> <span class="identifier">i</span><span class="special">+</span><span class="number">0.5f</span><span class="special">)));</span>
<span class="special">}</span>
<span class="comment">// display boxes</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"generated boxes:"</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="identifier">BOOST_FOREACH</span><span class="special">(</span><span class="identifier">box</span> <span class="keyword">const</span><span class="special">&</span> <span class="identifier">b</span><span class="special">,</span> <span class="identifier">boxes</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">box</span><span class="special">>(</span><span class="identifier">b</span><span class="special">)</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">// create the rtree</span>
<span class="identifier">parameters</span> <span class="identifier">params</span><span class="special">;</span>
<span class="identifier">indexable_getter</span> <span class="identifier">ind</span><span class="special">(</span><span class="identifier">boxes</span><span class="special">);</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">parameters</span><span class="special">,</span> <span class="identifier">indexable_getter</span><span class="special">></span> <span class="identifier">rtree</span><span class="special">(</span><span class="identifier">params</span><span class="special">,</span> <span class="identifier">ind</span><span class="special">);</span>
<span class="comment">// fill the spatial index</span>
<span class="keyword">for</span> <span class="special">(</span> <span class="identifier">size_t</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">0</span> <span class="special">;</span> <span class="identifier">i</span> <span class="special"><</span> <span class="identifier">boxes</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span> <span class="special">;</span> <span class="special">++</span><span class="identifier">i</span> <span class="special">)</span>
<span class="identifier">rtree</span><span class="special">.</span><span class="identifier">insert</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
<span class="comment">// find values intersecting some area defined by a box</span>
<span class="identifier">box</span> <span class="identifier">query_box</span><span class="special">(</span><span class="identifier">point</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">),</span> <span class="identifier">point</span><span class="special">(</span><span class="number">5</span><span class="special">,</span> <span class="number">5</span><span class="special">));</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">value</span><span class="special">></span> <span class="identifier">result_s</span><span class="special">;</span>
<span class="identifier">rtree</span><span class="special">.</span><span class="identifier">query</span><span class="special">(</span><span class="identifier">bgi</span><span class="special">::</span><span class="identifier">intersects</span><span class="special">(</span><span class="identifier">query_box</span><span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">result_s</span><span class="special">));</span>
<span class="comment">// find 5 nearest values to a point</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="identifier">value</span><span class="special">></span> <span class="identifier">result_n</span><span class="special">;</span>
<span class="identifier">rtree</span><span class="special">.</span><span class="identifier">query</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">point</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">),</span> <span class="number">5</span><span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">result_n</span><span class="special">));</span>
<span class="comment">// display results</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"spatial query box:"</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="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">box</span><span class="special">>(</span><span class="identifier">query_box</span><span class="special">)</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="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"spatial query result:"</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="identifier">BOOST_FOREACH</span><span class="special">(</span><span class="identifier">value</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">result_s</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">box</span><span class="special">>(</span><span class="identifier">boxes</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</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="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"knn query point:"</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="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">point</span><span class="special">>(</span><span class="identifier">point</span><span class="special">(</span><span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">))</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="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"knn query result:"</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="identifier">BOOST_FOREACH</span><span class="special">(</span><span class="identifier">value</span> <span class="identifier">i</span><span class="special">,</span> <span class="identifier">result_n</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">box</span><span class="special">>(</span><span class="identifier">boxes</span><span class="special">[</span><span class="identifier">i</span><span class="special">])</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">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
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