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<title>psimpl: psimpl::PolylineSimplification< DIM, InputIterator, OutputIterator >::DPHelper Class Reference</title>
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<div class="title">psimpl::PolylineSimplification< DIM, InputIterator, OutputIterator >::DPHelper Class Reference</div> </div>
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<!-- doxytag: class="psimpl::PolylineSimplification::DPHelper" -->
<p>Douglas-Peucker approximation helper class.
<a href="classpsimpl_1_1_polyline_simplification_1_1_d_p_helper.html#details">More...</a></p>
<p><a href="classpsimpl_1_1_polyline_simplification_1_1_d_p_helper-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_key_info.html">KeyInfo</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Defines the key of a polyline. <a href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_key_info.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_sub_poly.html">SubPoly</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Defines a sub polyline. <a href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_sub_poly.html#details">More...</a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_sub_poly_alt.html">SubPolyAlt</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Defines a sub polyline including its key. <a href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_sub_poly_alt.html#details">More...</a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classpsimpl_1_1_polyline_simplification_1_1_d_p_helper.html#a19ef5bd5a4ff343e4defbe3765215c28">Approximate</a> (const <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> *coords, <a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> coordCount, <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> tol, unsigned char *keys)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Performs Douglas-Peucker approximation. <a href="#a19ef5bd5a4ff343e4defbe3765215c28"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="classpsimpl_1_1_polyline_simplification_1_1_d_p_helper.html#afd49bef5d20db1ef171f9dcfc297e953">ApproximateN</a> (const <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> *coords, <a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> coordCount, unsigned countTol, unsigned char *keys)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Performs Douglas-Peucker approximation. <a href="#afd49bef5d20db1ef171f9dcfc297e953"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pri-static-methods"></a>
Static Private Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static <a class="el" href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_key_info.html">KeyInfo</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classpsimpl_1_1_polyline_simplification_1_1_d_p_helper.html#ab1e1bf2f9c562d9ea784466129ce0b19">FindKey</a> (const <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> *coords, <a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> first, <a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> last)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Finds the key for the given sub polyline. <a href="#ab1e1bf2f9c562d9ea784466129ce0b19"></a><br/></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><h3>template<unsigned DIM, class InputIterator, class OutputIterator><br/>
class psimpl::PolylineSimplification< DIM, InputIterator, OutputIterator >::DPHelper</h3>
<p>Douglas-Peucker approximation helper class. </p>
<p>Contains helper implentations for Douglas-Peucker approximation that operate solely on value_type arrays and value_type pointers. Note that the <a class="el" href="classpsimpl_1_1_polyline_simplification.html" title="Provides various simplification algorithms for n-dimensional simple polylines.">PolylineSimplification</a> class only operates on iterators. </p>
</div><hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a19ef5bd5a4ff343e4defbe3765215c28"></a><!-- doxytag: member="psimpl::PolylineSimplification::DPHelper::Approximate" ref="a19ef5bd5a4ff343e4defbe3765215c28" args="(const value_type *coords, ptr_diff_type coordCount, value_type tol, unsigned char *keys)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<unsigned DIM, class InputIterator, class OutputIterator> </div>
<table class="memname">
<tr>
<td class="memname">static void <a class="el" href="classpsimpl_1_1_polyline_simplification.html">psimpl::PolylineSimplification</a>< DIM, InputIterator, OutputIterator >::DPHelper::Approximate </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> * </td>
<td class="paramname"><em>coords</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> </td>
<td class="paramname"><em>coordCount</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> </td>
<td class="paramname"><em>tol</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>keys</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [inline, static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Performs Douglas-Peucker approximation. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">coords</td><td>array of polyline coordinates </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">coordCount</td><td>number of coordinates in coords [] </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">tol</td><td>approximation tolerance </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">keys</td><td>indicates for each polyline point if it is a key </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="afd49bef5d20db1ef171f9dcfc297e953"></a><!-- doxytag: member="psimpl::PolylineSimplification::DPHelper::ApproximateN" ref="afd49bef5d20db1ef171f9dcfc297e953" args="(const value_type *coords, ptr_diff_type coordCount, unsigned countTol, unsigned char *keys)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<unsigned DIM, class InputIterator, class OutputIterator> </div>
<table class="memname">
<tr>
<td class="memname">static void <a class="el" href="classpsimpl_1_1_polyline_simplification.html">psimpl::PolylineSimplification</a>< DIM, InputIterator, OutputIterator >::DPHelper::ApproximateN </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> * </td>
<td class="paramname"><em>coords</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> </td>
<td class="paramname"><em>coordCount</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned </td>
<td class="paramname"><em>countTol</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned char * </td>
<td class="paramname"><em>keys</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [inline, static]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Performs Douglas-Peucker approximation. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">coords</td><td>array of polyline coordinates </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">coordCount</td><td>number of coordinates in coords [] </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">countTol</td><td>point count tolerance </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">keys</td><td>indicates for each polyline point if it is a key </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ab1e1bf2f9c562d9ea784466129ce0b19"></a><!-- doxytag: member="psimpl::PolylineSimplification::DPHelper::FindKey" ref="ab1e1bf2f9c562d9ea784466129ce0b19" args="(const value_type *coords, ptr_diff_type first, ptr_diff_type last)" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template<unsigned DIM, class InputIterator, class OutputIterator> </div>
<table class="memname">
<tr>
<td class="memname">static <a class="el" href="structpsimpl_1_1_polyline_simplification_1_1_d_p_helper_1_1_key_info.html">KeyInfo</a> <a class="el" href="classpsimpl_1_1_polyline_simplification.html">psimpl::PolylineSimplification</a>< DIM, InputIterator, OutputIterator >::DPHelper::FindKey </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classpsimpl_1_1_polyline_simplification.html#aacad79ca2e6dc004483838f460ab8df1">value_type</a> * </td>
<td class="paramname"><em>coords</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> </td>
<td class="paramname"><em>first</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classpsimpl_1_1_polyline_simplification.html#a08f998ecc4af984c070603b489b3ce28">ptr_diff_type</a> </td>
<td class="paramname"><em>last</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [inline, static, private]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Finds the key for the given sub polyline. </p>
<p>Finds the point in the range [first, last] that is furthest away from the segment (first, last). This point is called the key.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">coords</td><td>array of polyline coordinates </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">first</td><td>the first coordinate of the first polyline point </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">last</td><td>the first coordinate of the last polyline point </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the index of the key and its distance, or last when a key could not be found </dd></dl>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li>D:/Code/Projects/psimpl/trunk/lib/<a class="el" href="psimpl_8h_source.html">psimpl.h</a></li>
</ul>
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<li class="navelem"><a class="el" href="namespacepsimpl.html">psimpl</a> </li>
<li class="navelem"><a class="el" href="classpsimpl_1_1_polyline_simplification.html">PolylineSimplification</a> </li>
<li class="navelem"><a class="el" href="classpsimpl_1_1_polyline_simplification_1_1_d_p_helper.html">DPHelper</a> </li>
<li class="footer">Generated on Fri Jun 24 2011 14:56:29 for psimpl by 
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