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<title>Mercator: Mercator::Edge Class Reference</title>
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<div class="navpath"><b>Mercator</b>::<a class="el" href="classMercator_1_1Edge.html">Edge</a>
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<h1>Mercator::Edge Class Reference</h1><!-- doxytag: class="Mercator::Edge" -->The edge of an area.
<a href="#_details">More...</a>
<p>
<p>
<a href="classMercator_1_1Edge-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#b69a7b19ce9bb93538f515c49a828364">Edge</a> (const Point2 &a, const Point2 &b)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <a href="#b69a7b19ce9bb93538f515c49a828364"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="1d697cc82c7555141bfbc7f7c4c1e518"></a><!-- doxytag: member="Mercator::Edge::start" ref="1d697cc82c7555141bfbc7f7c4c1e518" args="() const " -->
Point2 </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#1d697cc82c7555141bfbc7f7c4c1e518">start</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Accessor for the point describing the start of the edge. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="eab175725cf59138bbaa562d3979f20c"></a><!-- doxytag: member="Mercator::Edge::end" ref="eab175725cf59138bbaa562d3979f20c" args="() const " -->
Point2 </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#eab175725cf59138bbaa562d3979f20c">end</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Determine the point describing the end of the edge. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#9916a216f4a4877ae56254468626303c">xValueAtY</a> (double y) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Determine the x coordinate at a given y coordinate. <a href="#9916a216f4a4877ae56254468626303c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#eae3ba15666466b88d798727119fd569">operator<</a> (const <a class="el" href="classMercator_1_1Edge.html">Edge</a> &other) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Compare the y coordinate of the start with another edge. <a href="#eae3ba15666466b88d798727119fd569"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Private Attributes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="4a7712660d7e4829292fc005219f72a3"></a><!-- doxytag: member="Mercator::Edge::m_start" ref="4a7712660d7e4829292fc005219f72a3" args="" -->
Point2 </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#4a7712660d7e4829292fc005219f72a3">m_start</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The point describing the start of the edge. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3302763081c072bde20d5e14fb28b633"></a><!-- doxytag: member="Mercator::Edge::m_seg" ref="3302763081c072bde20d5e14fb28b633" args="" -->
Vector2 </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#3302763081c072bde20d5e14fb28b633">m_seg</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The vector describing the edge from its start. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f62ad4189c0dab6a88c7327742d68c75"></a><!-- doxytag: member="Mercator::Edge::m_inverseGradient" ref="f62ad4189c0dab6a88c7327742d68c75" args="" -->
double </td><td class="memItemRight" valign="bottom"><a class="el" href="classMercator_1_1Edge.html#f62ad4189c0dab6a88c7327742d68c75">m_inverseGradient</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">The inverse of the gradient of the line. <br></td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
The edge of an area. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="b69a7b19ce9bb93538f515c49a828364"></a><!-- doxytag: member="Mercator::Edge::Edge" ref="b69a7b19ce9bb93538f515c49a828364" args="(const Point2 &a, const Point2 &b)" -->
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<td class="memname">Mercator::Edge::Edge </td>
<td>(</td>
<td class="paramtype">const Point2 & </td>
<td class="paramname"> <em>a</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const Point2 & </td>
<td class="paramname"> <em>b</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [inline]</code></td>
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Constructor.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>a</em> </td><td>one end of the line defining the edge. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>b</em> </td><td>one end of the line defining the edge. </td></tr>
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<p>References <a class="el" href="AreaShader_8cpp_source.html#l00084">m_inverseGradient</a>, <a class="el" href="AreaShader_8cpp_source.html#l00082">m_seg</a>, and <a class="el" href="AreaShader_8cpp_source.html#l00080">m_start</a>.</p>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="eae3ba15666466b88d798727119fd569"></a><!-- doxytag: member="Mercator::Edge::operator<" ref="eae3ba15666466b88d798727119fd569" args="(const Edge &other) const " -->
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<td class="memname">bool Mercator::Edge::operator< </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classMercator_1_1Edge.html">Edge</a> & </td>
<td class="paramname"> <em>other</em> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<p>
Compare the y coordinate of the start with another edge.
<p>
This operator ensures that edges can be sorted, compares the y y coordinate of the start of the edges.
<p>References <a class="el" href="AreaShader_8cpp_source.html#l00080">m_start</a>.</p>
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<a class="anchor" name="9916a216f4a4877ae56254468626303c"></a><!-- doxytag: member="Mercator::Edge::xValueAtY" ref="9916a216f4a4877ae56254468626303c" args="(double y) const " -->
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<td class="memname">double Mercator::Edge::xValueAtY </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>y</em> </td>
<td> ) </td>
<td> const<code> [inline]</code></td>
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<p>
Determine the x coordinate at a given y coordinate.
<p>
Calculate the x coordinate on the edge line where the y coordinate is the value specified. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>y</em> </td><td>the y coordinate where the calculation is required. </td></tr>
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<p>References <a class="el" href="AreaShader_8cpp_source.html#l00084">m_inverseGradient</a>, and <a class="el" href="AreaShader_8cpp_source.html#l00080">m_start</a>.</p>
<p>Referenced by <a class="el" href="AreaShader_8cpp_source.html#l00097">Mercator::EdgeAtY::operator()()</a>.</p>
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<hr>The documentation for this class was generated from the following file:<ul>
<li>AreaShader.cpp</ul>
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