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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>libtcod documentation | Traversing the tree</title>
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you are here: <a onclick="link('../index2.html')">Index</a> > <a onclick="link('bsp.html')">12. BSP
toolkit</a> > <a onclick="link('bsp_traverse.html')">12.5. Traversing the tree</a><br>
<a class="prev" onclick="link('bsp_read.html')">12.4. Reading information from the tree</a>
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<h1>12.5. Traversing the tree</h1>
<a name="0"></a>
<p>You can scan all the nodes of the tree and have a custom function called back for each node.<br /> Each
traversal function returns false if the traversal has been interrupted (a callback returned false).<br /> *
Pre-order : the callback is called for the current node, then for the left son, then for the right son.<br /> *
In-order : the callback is called for the left son, then for current node, then for the right son.<br /> *
Post-order : the callback is called for the left son, then for the right son, then for the current node.<br /> *
Level-order : the callback is called for the nodes level by level, from left to right.<br /> * Inverted
level-order : the callback is called in the exact inverse order as Level-order.<br />
<table class="param">
<tbody>
<tr>
<th>Pre order</th>
<th>In order</th>
<th>Post order</th>
<th>Level order</th>
<th>Inverted level<br>order</th>
</tr>
<tr>
<td><img src="bsp_preorder.png"></td>
<td><img src="bsp_inorder.png"></td>
<td><img src="bsp_postorder.png"></td>
<td><img src="bsp_levelorder.png"></td>
<td><img src="bsp_invlevelorder.png"></td>
</tr>
</tbody>
</table><br /> </p>
<div class="code">
<p class="cpp"><span class="code-keyword">class</span> ITCODBspCallback<span class="code-symbol"> {</span><span
class="code-keyword"><br />public</span><span class="code-symbol"> :</span><span
class="code-keyword"><br /> virtual</span><span class="code-keyword"> bool</span>
visitNode<span class="code-symbol">(</span>TCODBsp<span class="code-symbol"> *</span>node<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-symbol"> =</span><span
class="code-value"> 0</span><span class="code-symbol">;</span><span class="code-symbol"><br />}</span><span
class="code-symbol">;</span><span class="code-keyword"><br /><br />bool</span> TCODBsp<span
class="code-symbol">::</span>traversePreOrder<span class="code-symbol">(</span>ITCODBspCallback<span
class="code-symbol"> *</span>callback<span class="code-symbol">,</span><span class="code-keyword">
void</span><span class="code-symbol"> *</span>userData<span class="code-symbol">)</span><span
class="code-keyword"><br />bool</span> TCODBsp<span class="code-symbol">::</span>traverseInOrder<span
class="code-symbol">(</span>ITCODBspCallback<span class="code-symbol"> *</span>callback<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-keyword"><br />bool</span> TCODBsp<span
class="code-symbol">::</span>traversePostOrder<span class="code-symbol">(</span>ITCODBspCallback<span
class="code-symbol"> *</span>callback<span class="code-symbol">,</span><span class="code-keyword">
void</span><span class="code-symbol"> *</span>userData<span class="code-symbol">)</span><span
class="code-keyword"><br />bool</span> TCODBsp<span class="code-symbol">::</span>traverseLevelOrder<span
class="code-symbol">(</span>ITCODBspCallback<span class="code-symbol"> *</span>callback<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-keyword"><br />bool</span> TCODBsp<span
class="code-symbol">::</span>traverseInvertedLevelOrder<span
class="code-symbol">(</span>ITCODBspCallback<span class="code-symbol"> *</span>callback<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span></p>
<p class="c"><span class="code-keyword">typedef</span><span class="code-keyword"> bool</span><span
class="code-symbol"> (</span><span class="code-symbol">*</span><span
class="code-tcod">TCOD_bsp_callback_t</span><span class="code-symbol">)</span><span
class="code-symbol">(</span><span class="code-tcod">TCOD_bsp_t</span><span class="code-symbol">
*</span>node<span class="code-symbol">,</span><span class="code-keyword"> void</span><span
class="code-symbol"> *</span>userData<span class="code-symbol">)</span><span
class="code-keyword"><br /><br />bool</span> TCOD_bsp_traverse_pre_order<span
class="code-symbol">(</span><span class="code-tcod">TCOD_bsp_t</span><span class="code-symbol">
*</span>node<span class="code-symbol">,</span><span class="code-tcod"> TCOD_bsp_callback_t</span>
callback<span class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-keyword"><br />bool</span>
TCOD_bsp_traverse_in_order<span class="code-symbol">(</span><span class="code-tcod">TCOD_bsp_t</span><span
class="code-symbol"> *</span>node<span class="code-symbol">,</span><span class="code-tcod">
TCOD_bsp_callback_t</span> callback<span class="code-symbol">,</span><span class="code-keyword">
void</span><span class="code-symbol"> *</span>userData<span class="code-symbol">)</span><span
class="code-keyword"><br />bool</span> TCOD_bsp_traverse_post_order<span class="code-symbol">(</span><span
class="code-tcod">TCOD_bsp_t</span><span class="code-symbol"> *</span>node<span
class="code-symbol">,</span><span class="code-tcod"> TCOD_bsp_callback_t</span> callback<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-keyword"><br />bool</span>
TCOD_bsp_traverse_level_order<span class="code-symbol">(</span><span class="code-tcod">TCOD_bsp_t</span><span
class="code-symbol"> *</span>node<span class="code-symbol">,</span><span class="code-tcod">
TCOD_bsp_callback_t</span> callback<span class="code-symbol">,</span><span class="code-keyword">
void</span><span class="code-symbol"> *</span>userData<span class="code-symbol">)</span><span
class="code-keyword"><br />bool</span> TCOD_bsp_traverse_inverted_level_order<span
class="code-symbol">(</span><span class="code-tcod">TCOD_bsp_t</span><span class="code-symbol">
*</span>node<span class="code-symbol">,</span><span class="code-tcod"> TCOD_bsp_callback_t</span>
callback<span class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span></p>
<p class="py"><span class="code-keyword">def</span> bsp_callback<span class="code-symbol">(</span>node<span
class="code-symbol">,</span> userData<span class="code-symbol">)</span><span class="code-symbol">
:</span><span class="code-comment"> # ...<br /><br /></span>bsp_traverse_pre_order<span
class="code-symbol">(</span>node<span class="code-symbol">,</span> callback<span
class="code-symbol">,</span> userData<span class="code-symbol">=</span><span
class="code-value">0</span><span class="code-symbol">)</span><br />bsp_traverse_in_order<span
class="code-symbol">(</span>node<span class="code-symbol">,</span> callback<span
class="code-symbol">,</span> userData<span class="code-symbol">=</span><span
class="code-value">0</span><span class="code-symbol">)</span><br />bsp_traverse_post_order<span
class="code-symbol">(</span>node<span class="code-symbol">,</span> callback<span
class="code-symbol">,</span> userData<span class="code-symbol">=</span><span
class="code-value">0</span><span class="code-symbol">)</span><br />bsp_traverse_level_order<span
class="code-symbol">(</span>node<span class="code-symbol">,</span> callback<span
class="code-symbol">,</span> userData<span class="code-symbol">=</span><span
class="code-value">0</span><span class="code-symbol">)</span><br />bsp_traverse_inverted_level_order<span
class="code-symbol">(</span>node<span class="code-symbol">,</span> callback<span
class="code-symbol">,</span> userData<span class="code-symbol">=</span><span
class="code-value">0</span><span class="code-symbol">)</span></p>
</div>
<table class="param">
<tbody>
<tr>
<th>Parameter</th>
<th>Description</th>
</tr>
<tr class="hilite">
<td>node</td>
<td>In the C version, the node reference (generally, the root node).<br /> </td>
</tr>
<tr>
<td>callback</td>
<td>The function to call for each node.<br /> It receives the current node and the custom data as
parameters<br /> If it returns false, the traversal is interrupted.<br /> </td>
</tr>
<tr class="hilite">
<td>userData</td>
<td>Custom data to pass to the callback.<br /> </td>
</tr>
</tbody>
</table>
<h6>Example:</h6>
<div class="code">
<p class="cpp"><span class="code-keyword">class</span> MyCallback<span class="code-symbol"> :</span><span
class="code-keyword"> public</span> ITCODBspCallback<span class="code-symbol"> {</span><span
class="code-keyword"><br />public</span><span class="code-symbol"> :</span><span
class="code-keyword"><br /> bool</span> visitNode<span
class="code-symbol">(</span>TCODBsp<span class="code-symbol"> *</span>node<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-symbol">
{</span><br /> printf<span class="code-symbol">(</span><span
class="code-string">"node pos %dx%d size %dx%d level %d\n"</span><span class="code-symbol">,</span>node<span
class="code-symbol">-></span>x<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>y<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>w<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>h<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>level<span class="code-symbol">)</span><span class="code-symbol">;</span><span
class="code-keyword"><br /> return</span><span
class="code-keyword"> true</span><span class="code-symbol">;</span><span
class="code-symbol"><br /> }</span><span class="code-symbol"><br />}</span><span
class="code-symbol">;</span><br />myBSP<span class="code-symbol">-></span>traversePostOrder<span
class="code-symbol">(</span><span class="code-keyword">new</span> MyListener<span
class="code-symbol">(</span><span class="code-symbol">)</span><span class="code-symbol">,</span><span
class="code-tcod">NULL</span><span class="code-symbol">)</span><span class="code-symbol">;</span></p>
<p class="c"><span class="code-keyword">bool</span> my_callback<span class="code-symbol">(</span><span
class="code-tcod">TCOD_bsp_t</span><span class="code-symbol"> *</span>node<span
class="code-symbol">,</span><span class="code-keyword"> void</span><span class="code-symbol">
*</span>userData<span class="code-symbol">)</span><span class="code-symbol">
{</span><br /> printf<span class="code-symbol">(</span><span
class="code-string">"node pos %dx%d size %dx%d level %d\n"</span><span class="code-symbol">,</span>node<span
class="code-symbol">-></span>x<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>y<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>w<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>h<span class="code-symbol">,</span>node<span
class="code-symbol">-></span>level<span class="code-symbol">)</span><span class="code-symbol">;</span><span
class="code-keyword"><br /> return</span> true<span class="code-symbol">;</span><span
class="code-symbol"><br />}</span><br />TCOD_bsp_traverse_post_order<span
class="code-symbol">(</span>my_bsp<span class="code-symbol">,</span>my_callback<span
class="code-symbol">,</span><span class="code-tcod">NULL</span><span class="code-symbol">)</span><span
class="code-symbol">;</span></p>
<p class="py"><span class="code-keyword">def</span> my_callback<span class="code-symbol">(</span>node<span
class="code-symbol">,</span> userData<span class="code-symbol">)</span><span class="code-symbol">
:</span><span class="code-keyword"><br /> print</span><span class="code-string">
"node pos %dx%d size %dx%d level %d"</span><span class="code-symbol">%</span><span
class="code-symbol">(</span>node<span class="code-symbol">.</span>x<span
class="code-symbol">,</span>node<span class="code-symbol">.</span>y<span
class="code-symbol">,</span>node<span class="code-symbol">.</span>w<span
class="code-symbol">,</span>node<span class="code-symbol">.</span>h<span
class="code-symbol">,</span>node<span class="code-symbol">.</span>level<span
class="code-symbol">)</span><span class="code-symbol">)</span><span
class="code-keyword"><br /> return</span><span class="code-keyword">
True</span><br />libtcod<span class="code-symbol">.</span>bsp_traverse_post_order<span
class="code-symbol">(</span>my_bsp<span class="code-symbol">,</span>my_callback<span
class="code-symbol">)</span></p>
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