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<title>NeL: NLMISC::CPolygon class Reference</title>
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<h1>NLMISC::CPolygon Class Reference</h1><code>#include <<a class="el" href="a06191.html">polygon.h</a>></code>
<p>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A polygon, with an unlimited size of vertices. <dl compact><dt><b>Author:</b></dt><dd>Lionel Berenguier <p>
Nevrax France </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>2000 </dd></dl>
<p>
<p>
Definition at line <a class="el" href="a06191.html#l00052">52</a> of file <a class="el" href="a06191.html">polygon.h</a>.<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona0">buildBasis</a> (<a class="el" href="a02851.html">CMatrix</a> &dest)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona1">chain</a> (const std::vector< <a class="el" href="a03100.html">CPolygon</a> > &other, const <a class="el" href="a02851.html">CMatrix</a> &basis)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona2">clip</a> (const std::vector< <a class="el" href="a03082.html">CPlane</a> > &planes)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clip a polygon with a set of planes. Cohen-sutherland clipping... clipPolygonBack() is used on planes. <a href="#NLMISC_1_1CPolygona2"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona3">clip</a> (const <a class="el" href="a03082.html">CPlane</a> *planes, <a class="el" href="a04558.html#a15">uint</a> nPlanes)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clip a polygon with a set of planes. Cohen-sutherland... clipPolygonBack() is used on planes. <a href="#NLMISC_1_1CPolygona3"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona4">CPolygon</a> (const <a class="el" href="a03128.html">CVector</a> &a, const <a class="el" href="a03128.html">CVector</a> &b, const <a class="el" href="a03128.html">CVector</a> &c)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. Init with a triangle. <a href="#NLMISC_1_1CPolygona4"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top> </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona5">CPolygon</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <a href="#NLMISC_1_1CPolygona5"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona6">getBestTriplet</a> (<a class="el" href="a04558.html#a15">uint</a> &index0, <a class="el" href="a04558.html#a15">uint</a> &index1, <a class="el" href="a04558.html#a15">uint</a> &index2)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">get the best triplet from this poly (the one that has the highest area) <a href="#NLMISC_1_1CPolygona6"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top><a class="el" href="a04558.html#a14">sint</a> </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona7">getNumVertices</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona8">serial</a> (<a class="el" href="a02270.html">NLMISC::IStream</a> &f) throw (NLMISC::EStream)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Serial this polygon. <a href="#NLMISC_1_1CPolygona8"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona9">toConvexPolygons</a> (std::list< <a class="el" href="a03100.html">CPolygon</a> > &outputPolygons, const <a class="el" href="a02851.html">CMatrix</a> &basis) const </td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygona10">toConvexPolygonsLocalAndBSP</a> (std::vector< <a class="el" href="a03128.html">CVector</a> > &localVertices, <a class="el" href="a02292.html">CBSPNode2v</a> &root, const <a class="el" href="a02851.html">CMatrix</a> &basis) const </td></tr>
<tr><td colspan=2><br><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (const std::vector< <a class="el" href="a03128.html">CVector</a> > &vertex, const <a class="el" href="a02292.html">CBSPNode2v</a> &bsp, <a class="el" href="a04558.html#a15">uint</a> a, <a class="el" href="a04558.html#a15">uint</a> b)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygone1">toConvexPolygonsEdgeIntersect</a> (const <a class="el" href="a03660.html">CVector2f</a> &a0, const <a class="el" href="a03660.html">CVector2f</a> &a1, const <a class="el" href="a03660.html">CVector2f</a> &b0, const <a class="el" href="a03660.html">CVector2f</a> &b1)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygone2">toConvexPolygonsInCone</a> (const std::vector< <a class="el" href="a03128.html">CVector</a> > &vertex, <a class="el" href="a04558.html#a15">uint</a> a, <a class="el" href="a04558.html#a15">uint</a> b)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygone3">toConvexPolygonsLeft</a> (const std::vector< <a class="el" href="a03128.html">CVector</a> > &vertex, <a class="el" href="a04558.html#a15">uint</a> a, <a class="el" href="a04558.html#a15">uint</a> b, <a class="el" href="a04558.html#a15">uint</a> c)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>bool </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygone4">toConvexPolygonsLeftOn</a> (const std::vector< <a class="el" href="a03128.html">CVector</a> > &vertex, <a class="el" href="a04558.html#a15">uint</a> a, <a class="el" href="a04558.html#a15">uint</a> b, <a class="el" href="a04558.html#a15">uint</a> c)</td></tr>
<tr><td colspan=2><br><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>std::vector< <a class="el" href="a03128.html">CVector</a> > </td><td class="memItemRight" valign=bottom><a class="el" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a></td></tr>
</table>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="NLMISC_1_1CPolygona5" doxytag="NLMISC::CPolygon::CPolygon" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> NLMISC::CPolygon::CPolygon </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [inline]</code></td>
</tr>
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</td>
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<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Constructor.
<p>
<p>
Definition at line <a class="el" href="a06191.html#l00060">60</a> of file <a class="el" href="a06191.html">polygon.h</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00440">toConvexPolygons()</a>.
<p>
<div class="fragment"><pre>00060 {}
</pre></div> </td>
</tr>
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<a class="anchor" name="NLMISC_1_1CPolygona4" doxytag="NLMISC::CPolygon::CPolygon" ></a><p>
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<td class="md" nowrap valign="top"> NLMISC::CPolygon::CPolygon </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="a03128.html">CVector</a> & </td>
<td class="mdname" nowrap> <em>a</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a03128.html">CVector</a> & </td>
<td class="mdname" nowrap> <em>b</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a03128.html">CVector</a> & </td>
<td class="mdname" nowrap> <em>c</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Constructor. Init with a triangle.
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00046">46</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
<div class="fragment"><pre>00047 {
00048 <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.reserve(3);
00049 <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.push_back(a);
00050 <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.push_back(b);
00051 <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.push_back(c);
00052 }
</pre></div> </td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="NLMISC_1_1CPolygona0" doxytag="NLMISC::CPolygon::buildBasis" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CPolygon::buildBasis </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="a02851.html">CMatrix</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>dest</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Takes the best triplet from this poly to build a normal. From this normal and a points, build a basis (the normal is the K vector of the basis) This can be used to transform the poly in 2D after it has been inverted
<p>
Definition at line <a class="el" href="a06190.html#l00141">141</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06190.html#l00106">getBestTriplet()</a>, <a class="el" href="a05622.html#l00290">nlassert</a>, <a class="el" href="a05972.html#l00267">NLMISC::CMatrix::setPos()</a>, <a class="el" href="a05972.html#l00209">NLMISC::CMatrix::setRot()</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
<div class="fragment"><pre>00142 {
00143 <a class="code" href="a04199.html#a6">nlassert</a>(<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size() > 3);
00144 <a class="code" href="a04558.html#a15">uint</a> i1, i2, i3;
00145 <a class="code" href="a03100.html#NLMISC_1_1CPolygona6">getBestTriplet</a>(i1, i2, i3);
00146 CVector v1 = (<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>[i2] - Vertices[i1]).normed();
00147 CVector v2 = (Vertices[i3] - Vertices[i1]).normed();
00148 CVector K = v2 ^ v1;
00149 CVector I = v1 - (v1 * K) * v1;
00150 CVector J = K ^ I;
00151 dest.<a class="code" href="a02851.html#NLMISC_1_1CMatrixz1961_10">setRot</a>(I, J, K);
00152 dest.<a class="code" href="a02851.html#NLMISC_1_1CMatrixz1961_4">setPos</a>(Vertices[i1]);
00153 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygona1" doxytag="NLMISC::CPolygon::chain" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::chain </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="a03100.html">CPolygon</a> > & </td>
<td class="mdname" nowrap> <em>other</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a02851.html">CMatrix</a> & </td>
<td class="mdname" nowrap> <em>basis</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Chain the arg polygons with this polygon testing 2d intersections. The 2d intersection test has been done in the XY plane of the basis passed at the function.<p>
The polygon a-b-c-d-e chained with f-g-h-i-j will give the polygon a-b-f-g-h-i-j-f-b-c-d-e if the edge b-f is not 2d clipped by any edge plane in the XY plane of basis.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>basis</em> </td><td>is the basis of the polygon projection. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>false if chain failed. else true.</dd></dl>
<p>
Definition at line <a class="el" href="a06190.html#l00624">624</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a05646.html#l00225">index</a>, <a class="el" href="a06190.html#l00299">NLMISC::CBSPNode2v::intersect()</a>, <a class="el" href="a06190.html#l00392">toConvexPolygonsLocalAndBSP()</a>, <a class="el" href="a05981.html#l00105">uint</a>, and <a class="el" href="a06191.html#l00055">Vertices</a>.
<p>
<div class="fragment"><pre>00625 {
00626 <span class="comment">// Local vertices</span>
00627 std::vector<CVector> localVertices;
00628
00629 <span class="comment">// Build the BSP root</span>
00630 <a class="code" href="a02292.html">CBSPNode2v</a> root;
00631
00632 <span class="comment">// Build the local array and the BSP</span>
00633 <a class="code" href="a03100.html#NLMISC_1_1CPolygona10">toConvexPolygonsLocalAndBSP</a> (localVertices, root, basis);
00634
00635 <span class="comment">// Local vertices</span>
00636 std::vector<std::vector<CVector> > localVerticesOther (other.size());
00637
00638 <span class="comment">// Build the BSP root</span>
00639 std::vector<CBSPNode2v> rootOther (other.size());
00640
00641 <span class="comment">// Build a copy of the polygons</span>
00642 std::vector<CPolygon> copy = other;
00643
00644 <span class="comment">// Main copy</span>
00645 <a class="code" href="a03100.html#NLMISC_1_1CPolygona5">CPolygon</a> mainCopy = *<span class="keyword">this</span>;
00646
00647 <span class="comment">// For each other polygons</span>
00648 <a class="code" href="a04558.html#a15">uint</a> o;
00649 <span class="keywordflow">for</span> (o=0; o<other.size(); o++)
00650 {
00651 <span class="comment">// Build the local array and the BSP</span>
00652 other[o].toConvexPolygonsLocalAndBSP (localVerticesOther[o], rootOther[o], basis);
00653 }
00654
00655 <span class="comment">// Look for a couple..</span>
00656 <a class="code" href="a04558.html#a15">uint</a> thisCount = <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size();
00657 <a class="code" href="a04558.html#a15">uint</a> i, j;
00658 <span class="keywordflow">for</span> (o=0; o<other.size(); o++)
00659 {
00660 <a class="code" href="a04558.html#a15">uint</a> otherCount = other[o].Vertices.size();
00661
00662 <span class="comment">// Try to link in the main polygon</span>
00663 <span class="keywordflow">for</span> (i=0; i<thisCount; i++)
00664 {
00665 <span class="keywordflow">for</span> (j=0; j<otherCount; j++)
00666 {
00667 <span class="comment">// Test this segement</span>
00668 <span class="keywordflow">if</span> (!root.<a class="code" href="a02292.html#NLMISC_1_1CBSPNode2va3">intersect</a> (localVertices[i], localVerticesOther[o][j], i, 0xffffffff))
00669 {
00670 <span class="comment">// Test each other polygons</span>
00671 <a class="code" href="a04558.html#a15">uint</a> otherO;
00672 <span class="keywordflow">for</span> (otherO=0; otherO<other.size(); otherO++)
00673 {
00674 <span class="comment">// Intersect ?</span>
00675 <span class="keywordflow">if</span> (rootOther[otherO].intersect (localVertices[i], localVerticesOther[o][j], 0xffffffff, (otherO == o)?j:0xffffffff))
00676 <span class="keywordflow">break</span>;
00677 }
00678
00679 <span class="comment">// Continue ?</span>
00680 <span class="keywordflow">if</span> (otherO==other.size())
00681 {
00682 <span class="comment">// Insert new vertices</span>
00683 mainCopy.Vertices.insert (mainCopy.Vertices.begin()+i, 2+otherCount, CVector());
00684
00685 <span class="comment">// Copy the first vertex</span>
00686 mainCopy.Vertices[i] = mainCopy.Vertices[i+otherCount+2];
00687
00688 <span class="comment">// Copy the new vertices</span>
00689 <a class="code" href="a04558.html#a15">uint</a> k;
00690 <span class="keywordflow">for</span> (k=0; k<otherCount; k++)
00691 {
00692 <a class="code" href="a04558.html#a15">uint</a> <a class="code" href="a04223.html#a566">index</a> = j+k;
00693 <span class="keywordflow">if</span> (<a class="code" href="a04223.html#a566">index</a>>=otherCount)
00694 <a class="code" href="a04223.html#a566">index</a> -= otherCount;
00695 mainCopy.Vertices[i+k+1] = copy[o].Vertices[<a class="code" href="a04223.html#a566">index</a>];
00696 }
00697
00698 <span class="comment">// Copy the last one</span>
00699 mainCopy.Vertices[i+otherCount+1] = copy[o].Vertices[j];
00700 <span class="keywordflow">break</span>;
00701 }
00702 }
00703 }
00704 <span class="keywordflow">if</span> (j!=otherCount)
00705 <span class="keywordflow">break</span>;
00706 }
00707
00708 <span class="comment">// Not found ?</span>
00709 <span class="keywordflow">if</span> (i==thisCount)
00710 {
00711 <span class="comment">// Try to link in the sub polygons</span>
00712 <a class="code" href="a04558.html#a15">uint</a> otherToCheck;
00713 <span class="keywordflow">for</span> (otherToCheck=o+1; otherToCheck<other.size(); otherToCheck++)
00714 {
00715 <a class="code" href="a04558.html#a15">uint</a> otherToCheckCount = other[otherToCheck].Vertices.size();
00716 <span class="keywordflow">for</span> (i=0; i<otherToCheckCount; i++)
00717 {
00718 <span class="keywordflow">for</span> (j=0; j<otherCount; j++)
00719 {
00720 <span class="comment">// Test this segement</span>
00721 <span class="keywordflow">if</span> (!rootOther[otherToCheck].intersect (localVerticesOther[otherToCheck][i], localVerticesOther[o][j], i, 0xffffffff))
00722 {
00723 <span class="comment">// Test each other polygons</span>
00724 <a class="code" href="a04558.html#a15">uint</a> otherO;
00725 <span class="keywordflow">for</span> (otherO=0; otherO<other.size(); otherO++)
00726 {
00727 <span class="comment">// Intersect ?</span>
00728 <span class="keywordflow">if</span> (rootOther[otherO].intersect (localVerticesOther[otherToCheck][i], localVerticesOther[o][j], (otherToCheck == otherO)?i:0xffffffff, (otherO == o)?j:0xffffffff))
00729 <span class="keywordflow">break</span>;
00730 }
00731
00732 <span class="comment">// Continue ?</span>
00733 <span class="keywordflow">if</span> (otherO==other.size())
00734 {
00735 <span class="comment">// Insert new vertices</span>
00736 copy[otherToCheck].Vertices.insert (copy[otherToCheck].<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.begin()+i, 2+otherCount, CVector());
00737
00738 <span class="comment">// Copy the first vertex</span>
00739 copy[otherToCheck].Vertices[i] = copy[otherToCheck].Vertices[i+otherCount+2];
00740
00741 <span class="comment">// Copy the new vertices</span>
00742 <a class="code" href="a04558.html#a15">uint</a> k;
00743 <span class="keywordflow">for</span> (k=0; k<otherCount; k++)
00744 {
00745 <a class="code" href="a04558.html#a15">uint</a> <a class="code" href="a04223.html#a566">index</a> = j+k;
00746 <span class="keywordflow">if</span> (<a class="code" href="a04223.html#a566">index</a>>=otherCount)
00747 <a class="code" href="a04223.html#a566">index</a> -= otherCount;
00748 copy[otherToCheck].Vertices[i+k+1] = copy[otherO].Vertices[<a class="code" href="a04223.html#a566">index</a>];
00749 }
00750
00751 <span class="comment">// Copy the last one</span>
00752 copy[otherToCheck].Vertices[i+otherCount+1] = copy[otherO].Vertices[j];
00753 <span class="keywordflow">break</span>;
00754 }
00755 }
00756 }
00757 <span class="keywordflow">if</span> (j!=otherCount)
00758 <span class="keywordflow">break</span>;
00759 }
00760 <span class="keywordflow">if</span> (i!=otherToCheckCount)
00761 <span class="keywordflow">break</span>;
00762 }
00763 <span class="keywordflow">if</span> (otherToCheck==other.size())
00764 {
00765 <span class="comment">// Not ok</span>
00766 <span class="keywordflow">return</span> <span class="keyword">false</span>;
00767 }
00768 }
00769 }
00770
00771 <span class="comment">// Ok</span>
00772 *<span class="keyword">this</span> = mainCopy;
00773 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00774 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygona2" doxytag="NLMISC::CPolygon::clip" ></a><p>
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<td class="mdRow">
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<td class="md" nowrap valign="top"> void NLMISC::CPolygon::clip </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="a03082.html">CPlane</a> > & </td>
<td class="mdname1" valign="top" nowrap> <em>planes</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Clip a polygon with a set of planes. Cohen-sutherland clipping... clipPolygonBack() is used on planes.
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00089">89</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06190.html#l00056">clip()</a>.
<p>
<div class="fragment"><pre>00090 {
00091 <span class="keywordflow">if</span>(planes.size()==0)
00092 <span class="keywordflow">return</span>;
00093 <a class="code" href="a03100.html#NLMISC_1_1CPolygona3">clip</a>(&(*planes.begin()), planes.size());
00094 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygona3" doxytag="NLMISC::CPolygon::clip" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
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<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void NLMISC::CPolygon::clip </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="a03082.html">CPlane</a> * </td>
<td class="mdname" nowrap> <em>planes</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>nPlanes</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Clip a polygon with a set of planes. Cohen-sutherland... clipPolygonBack() is used on planes.
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00056">56</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06170.html#l00097">NLMISC::CPlane::clipPolygonBack()</a>, <a class="el" href="a06191.html#l00064">getNumVertices()</a>, <a class="el" href="a05646.html#l01122">in</a>, <a class="el" href="a05981.html#l00104">sint</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00089">clip()</a>, <a class="el" href="a06193.html#l00083">NL3D::CPortal::clipPyramid()</a>, <a class="el" href="a06737.html#l01054">NL3D::CWaterModel::computeClippedPoly()</a>, <a class="el" href="a06737.html#l01026">NL3D::CWaterModel::computeSimpleClippedPoly()</a>, <a class="el" href="a06350.html#l01224">NL3D::CInstanceGroup::displayDebugClusters()</a>, and <a class="el" href="a05384.html#l00121">NLMISC::CAABBox::intersect()</a>.
<p>
<div class="fragment"><pre>00057 {
00058 <span class="keywordflow">if</span>(nPlanes==0 || <a class="code" href="a03100.html#NLMISC_1_1CPolygona7">getNumVertices</a>()==0)
00059 <span class="keywordflow">return</span>;
00060
00061 <span class="comment">// The final polygon has at maximum currentVertices+number of clipping planes.</span>
00062 <span class="comment">// For performance, the vectors are static, so reallocation rarely occurs.</span>
00063 <span class="keyword">static</span> vector<CVector> tab0, tab1;
00064 tab0.resize(<a class="code" href="a03100.html#NLMISC_1_1CPolygona7">getNumVertices</a>()+nPlanes);
00065 tab1.resize(<a class="code" href="a03100.html#NLMISC_1_1CPolygona7">getNumVertices</a>()+nPlanes);
00066 <span class="comment">// Init tab0 with Vertices.</span>
00067 copy(<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.begin(), <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.end(), tab0.begin());
00068 CVector *<a class="code" href="a04223.html#a647">in</a>=&(*tab0.begin()), *out= &(*tab1.begin());
00069 <a class="code" href="a04558.html#a14">sint</a> nin= <a class="code" href="a03100.html#NLMISC_1_1CPolygona7">getNumVertices</a>(), nout;
00070 <span class="keywordflow">for</span>(<a class="code" href="a04558.html#a14">sint</a> i=0;i<(<a class="code" href="a04558.html#a14">sint</a>)nPlanes;i++)
00071 {
00072 nout= planes[i].clipPolygonBack(in, out, nin);
00073 swap(in, out);
00074 nin= nout;
00075 <span class="keywordflow">if</span>(nin==0)
00076 <span class="keywordflow">break</span>;
00077 }
00078
00079 <span class="comment">// Final result in "in".</span>
00080 <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.resize(nin);
00081 <span class="keywordflow">if</span>(nin>0)
00082 {
00083 memcpy(&(*<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.begin()), <a class="code" href="a04223.html#a647">in</a>, nin*<span class="keyword">sizeof</span>(CVector));
00084 }
00085 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygona6" doxytag="NLMISC::CPolygon::getBestTriplet" ></a><p>
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<tr>
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<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> void NLMISC::CPolygon::getBestTriplet </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="a04558.html#a15">uint</a> & </td>
<td class="mdname" nowrap> <em>index0</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> & </td>
<td class="mdname" nowrap> <em>index1</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> & </td>
<td class="mdname" nowrap> <em>index2</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
get the best triplet from this poly (the one that has the highest area)
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00106">106</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a05622.html#l00290">nlassert</a>, <a class="el" href="a06682.html#l00115">NLMISC::CVector::norm()</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00141">buildBasis()</a>.
<p>
<div class="fragment"><pre>00107 {
00108 <a class="code" href="a04199.html#a6">nlassert</a>(<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size() >= 3);
00109 <a class="code" href="a04558.html#a15">uint</a> i, j, k;
00110 <span class="keywordtype">float</span> bestArea = 0.f;
00111 <span class="keyword">const</span> <a class="code" href="a04558.html#a15">uint</a> numVerts = <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size();
00112 <span class="keywordflow">for</span> (i = 0; i < numVerts; ++i)
00113 {
00114 <span class="keywordflow">for</span> (j = 0; j < numVerts; ++j)
00115 {
00116 <span class="keywordflow">if</span> (i != j)
00117 {
00118 <span class="keywordflow">for</span> (k = 0; k < numVerts; ++k)
00119 {
00120 <span class="keywordflow">if</span> (k != i && k != j)
00121 {
00122 CVector v0 = <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>[j] - Vertices[i];
00123 CVector v1 = Vertices[k] - Vertices[i];
00124 <span class="keywordtype">float</span> area = (v0 ^ v1).norm();
00125 <span class="keywordflow">if</span> (area > bestArea)
00126 {
00127 bestArea = area;
00128 index0 = i;
00129 index1 = j;
00130 index2 = k;
00131 }
00132 }
00133 }
00134 }
00135 }
00136 }
00137
00138 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygona7" doxytag="NLMISC::CPolygon::getNumVertices" ></a><p>
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> <a class="el" href="a04558.html#a14">sint</a> NLMISC::CPolygon::getNumVertices </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">void </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [inline]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
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<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="a06191.html#l00064">64</a> of file <a class="el" href="a06191.html">polygon.h</a>.
<p>
References <a class="el" href="a05981.html#l00104">sint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00056">clip()</a>, <a class="el" href="a05384.html#l00121">NLMISC::CAABBox::intersect()</a>, and <a class="el" href="a06768.html#l02927">NL3D::CZoneLighter::lightWater()</a>.
<p>
<div class="fragment"><pre>00064 {<span class="keywordflow">return</span> <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size();}
</pre></div> </td>
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</table>
<a class="anchor" name="NLMISC_1_1CPolygona8" doxytag="NLMISC::CPolygon::serial" ></a><p>
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> void NLMISC::CPolygon::serial </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top"><a class="el" href="a02270.html">NLMISC::IStream</a> & </td>
<td class="mdname1" valign="top" nowrap> <em>f</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> throw (<a class="el" href="a03781.html">NLMISC::EStream</a>)</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Serial this polygon.
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00099">99</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
<div class="fragment"><pre>00100 {
00101 f.<a class="code" href="a02270.html#NLMISC_1_1IStreamz2035_8">serialVersion</a>(0);
00102 f.<a class="code" href="a02270.html#NLMISC_1_1IStreamz2033_9">serialCont</a>(Vertices);
00103 }
</pre></div> </td>
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</table>
<a class="anchor" name="NLMISC_1_1CPolygona9" doxytag="NLMISC::CPolygon::toConvexPolygons" ></a><p>
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<table cellpadding="0" cellspacing="0" border="0">
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<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::toConvexPolygons </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">std::list< <a class="el" href="a03100.html">CPolygon</a> > & </td>
<td class="mdname" nowrap> <em>outputPolygons</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a02851.html">CMatrix</a> & </td>
<td class="mdname" nowrap> <em>basis</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
Convert a concave polygon into a list of convex polygons using a 2d projection. The polygon mustn't overlap itself in the XY plane of the basis passed in parameter. The polygon must be direct in the XY plane of the basis passed in parameter. (Counter clock wise)<p>
The subdivison is in non-constant n*log(n) with n is the number of vertices.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>outputPolygons</em> </td><td>is the list filled with clipped convex polygons. The list is not cleared at the begining. New polygons are just appended at the end. </td></tr>
<tr><td valign=top><em>basis</em> </td><td>is the basis of the polygon projection. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>true if the polygon has been subdivided. false if the polygon overlap itself in the XY plane of the basis or if the polygon is not direct (clock wise).</dd></dl>
<p>
Definition at line <a class="el" href="a06190.html#l00440">440</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06191.html#l00060">CPolygon()</a>, <a class="el" href="a05622.html#l00290">nlassert</a>, <a class="el" href="a06190.html#l00375">toConvexPolygonsDiagonal()</a>, <a class="el" href="a06190.html#l00392">toConvexPolygonsLocalAndBSP()</a>, <a class="el" href="a05981.html#l00105">uint</a>, and <a class="el" href="a06191.html#l00055">Vertices</a>.
<p>
<div class="fragment"><pre>00441 {
00442 <span class="comment">// Some vertices ?</span>
00443 <span class="keywordflow">if</span> (<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size()>2)
00444 {
00445 <span class="comment">// Local vertices</span>
00446 std::vector<CVector> localVertices;
00447
00448 <span class="comment">// Build the BSP root</span>
00449 <a class="code" href="a02292.html">CBSPNode2v</a> root;
00450
00451 <span class="comment">// Build the local array and the BSP</span>
00452 <a class="code" href="a03100.html#NLMISC_1_1CPolygona10">toConvexPolygonsLocalAndBSP</a> (localVertices, root, basis);
00453
00454 <span class="comment">// Build a vertex list</span>
00455 std::list<uint> vertexList;
00456 <a class="code" href="a04558.html#a15">uint</a> i;
00457 <span class="keywordflow">for</span> (i=0; i<<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size(); i++)
00458 vertexList.push_back (i);
00459
00460 <span class="comment">// Clip ears while there is some polygons</span>
00461 std::list<uint>::iterator current=vertexList.begin();
00462 std::list<uint>::iterator begin=vertexList.begin();
00463 <span class="keywordflow">do</span>
00464 {
00465 again:;
00466 <span class="comment">// Search for a diagonal</span>
00467 <span class="keywordtype">bool</span> found = <span class="keyword">false</span>;
00468
00469 <span class="comment">// Get next vertex</span>
00470 std::list<uint>::iterator first = current;
00471 std::list<uint>::iterator lastPreviousPrevious=current;
00472 std::list<uint>::iterator lastPrevious=current;
00473 lastPrevious++;
00474 <span class="keywordflow">if</span> (lastPrevious==vertexList.end())
00475 lastPrevious = vertexList.begin();
00476 std::list<uint>::iterator currentNext = lastPrevious;
00477 std::list<uint>::iterator last = lastPrevious;
00478 last++;
00479 <span class="keywordflow">if</span> (last==vertexList.end())
00480 last = vertexList.begin();
00481 <span class="keywordflow">while</span> (last != current)
00482 {
00483 <span class="comment">// Is a diagonal ?</span>
00484 <span class="keywordflow">if</span> (
00485 (<a class="code" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (localVertices, root, *lastPreviousPrevious, *last)) &&
00486 (<a class="code" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (localVertices, root, *currentNext, *last)) &&
00487 (<a class="code" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (localVertices, root, *last, *current))
00488 )
00489 {
00490 <span class="comment">// Find one</span>
00491 found = <span class="keyword">true</span>;
00492 }
00493 <span class="keywordflow">else</span>
00494 {
00495 <span class="comment">// Come back</span>
00496 last = lastPrevious;
00497 lastPrevious = lastPreviousPrevious;
00498 <span class="keywordflow">break</span>;
00499 }
00500
00501 <span class="comment">// Next vertex</span>
00502 lastPreviousPrevious = lastPrevious;
00503 lastPrevious = last++;
00504 <span class="keywordflow">if</span> (last==vertexList.end())
00505 last = vertexList.begin();
00506 }
00507
00508 <span class="comment">// Last polygon ?</span>
00509 <span class="keywordflow">if</span> (last==current)
00510 {
00511 <span class="comment">// Add a polygon</span>
00512 outputPolygons.push_back (<a class="code" href="a03100.html#NLMISC_1_1CPolygona5">CPolygon</a>());
00513 <a class="code" href="a03100.html#NLMISC_1_1CPolygona5">CPolygon</a> &back = outputPolygons.back ();
00514 back.Vertices.reserve (vertexList.size());
00515
00516 <span class="comment">// Add each vertex in the new polygon</span>
00517 current=vertexList.begin();
00518 <span class="keywordflow">while</span> (current!=vertexList.end())
00519 {
00520 back.Vertices.push_back (Vertices[*current]);
00521 current++;
00522 }
00523
00524 <span class="comment">// Exit</span>
00525 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00526 }
00527 <span class="keywordflow">else</span>
00528 {
00529 std::list<uint>::iterator firstNext = current;
00530 std::list<uint>::iterator firstNextNext = currentNext;
00531 <span class="keywordflow">if</span> (first != vertexList.begin())
00532 first--;
00533 <span class="keywordflow">else</span>
00534 {
00535 first = vertexList.end();
00536 first--;
00537 }
00538
00539 <span class="keywordflow">while</span> (current != first)
00540 {
00541 <span class="comment">// Is a diagonal ?</span>
00542 <span class="keywordflow">if</span> (
00543 (<a class="code" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (localVertices, root, *firstNextNext, *first)) &&
00544 (<a class="code" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (localVertices, root, *lastPrevious, *first)) &&
00545 (<a class="code" href="a03100.html#NLMISC_1_1CPolygone0">toConvexPolygonsDiagonal</a> (localVertices, root, *last, *first))
00546 )
00547 {
00548 <span class="comment">// Find one</span>
00549 found = <span class="keyword">true</span>;
00550 }
00551 <span class="keywordflow">else</span>
00552 {
00553 <span class="comment">// Come back</span>
00554 first = firstNext;
00555 <span class="keywordflow">break</span>;
00556 }
00557
00558 <span class="comment">// Next vertex</span>
00559 firstNextNext = firstNext;
00560 firstNext = first;
00561 <span class="keywordflow">if</span> (first==vertexList.begin())
00562 {
00563 first = vertexList.end();
00564 first--;
00565 }
00566 <span class="keywordflow">else</span>
00567 first--;
00568 }
00569 }
00570
00571 <span class="comment">// Found ?</span>
00572 <span class="keywordflow">if</span> (found)
00573 {
00574 <span class="comment">// Count vertex</span>
00575 outputPolygons.push_back (<a class="code" href="a03100.html#NLMISC_1_1CPolygona5">CPolygon</a>());
00576 <a class="code" href="a03100.html#NLMISC_1_1CPolygona5">CPolygon</a> &back = outputPolygons.back ();
00577
00578 <span class="comment">// Vertex count</span>
00579 <a class="code" href="a04558.html#a15">uint</a> vertexCount = 1;
00580 current = first;
00581 <span class="keywordflow">while</span> (current != last)
00582 {
00583 vertexCount++;
00584 current++;
00585 <span class="keywordflow">if</span> (current == vertexList.end())
00586 current = vertexList.begin();
00587 }
00588
00589 <span class="comment">// Alloc vertices</span>
00590 back.Vertices.reserve (vertexCount);
00591
00592 <span class="comment">// Copy and remove vertices</span>
00593 back.Vertices.push_back (Vertices[*first]);
00594 first++;
00595 <span class="keywordflow">if</span> (first == vertexList.end())
00596 first = vertexList.begin();
00597 <span class="keywordflow">while</span> (first != last)
00598 {
00599 back.Vertices.push_back (Vertices[*first]);
00600
00601 <span class="comment">// Remove from list</span>
00602 first = vertexList.erase (first);
00603 <span class="keywordflow">if</span> (first == vertexList.end())
00604 first = vertexList.begin();
00605 <a class="code" href="a04199.html#a6">nlassert</a> (first != vertexList.end());
00606 }
00607 back.Vertices.push_back (Vertices[*first]);
00608 current = begin = last;
00609 <span class="keywordflow">goto</span> again;
00610 }
00611
00612 <span class="comment">// Next current</span>
00613 current++;
00614 <span class="keywordflow">if</span> (current == vertexList.end())
00615 current = vertexList.begin ();
00616 }
00617 <span class="keywordflow">while</span> (current != begin);
00618 }
00619 <span class="keywordflow">return</span> <span class="keyword">false</span>;
00620 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygone0" doxytag="NLMISC::CPolygon::toConvexPolygonsDiagonal" ></a><p>
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<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::toConvexPolygonsDiagonal </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="a03128.html">CVector</a> > & </td>
<td class="mdname" nowrap> <em>vertex</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a02292.html">CBSPNode2v</a> & </td>
<td class="mdname" nowrap> <em>bsp</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>a</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>b</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00375">375</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06190.html#l00299">NLMISC::CBSPNode2v::intersect()</a>, <a class="el" href="a06190.html#l00351">toConvexPolygonsInCone()</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00440">toConvexPolygons()</a>.
<p>
<div class="fragment"><pre>00376 {
00377 <span class="comment">// Check it is a border</span>
00378 <span class="keywordflow">if</span> ( ( (b - a) == 1) || ( (a - b) == 1) || ( (a==0) && (b ==(vertex.size()-1))) || ( (b==0) && (a ==(vertex.size()-1))) )
00379 <span class="keywordflow">return</span> <span class="keyword">true</span>;
00380
00381 <span class="comment">// Check visibility</span>
00382 <span class="keywordflow">if</span> (<a class="code" href="a03100.html#NLMISC_1_1CPolygone2">toConvexPolygonsInCone</a> (vertex, a, b) && <a class="code" href="a03100.html#NLMISC_1_1CPolygone2">toConvexPolygonsInCone</a> (vertex, b, a))
00383 {
00384 <span class="comment">// Intersection ?</span>
00385 <span class="keywordflow">return</span> !bsp.<a class="code" href="a02292.html#NLMISC_1_1CBSPNode2va3">intersect</a> (vertex[a], vertex[b], a, b);
00386 }
00387 <span class="keywordflow">return</span> <span class="keyword">false</span>;
00388 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NLMISC_1_1CPolygone1" doxytag="NLMISC::CPolygon::toConvexPolygonsEdgeIntersect" ></a><p>
<table class="mdTable" width="100%" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::toConvexPolygonsEdgeIntersect </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="a03660.html">CVector2f</a> & </td>
<td class="mdname" nowrap> <em>a0</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a03660.html">CVector2f</a> & </td>
<td class="mdname" nowrap> <em>a1</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a03660.html">CVector2f</a> & </td>
<td class="mdname" nowrap> <em>b0</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a03660.html">CVector2f</a> & </td>
<td class="mdname" nowrap> <em>b1</em></td>
</tr>
<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="a06190.html#l00177">177</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06677.html#l00052">NLMISC::CVector2f::x</a>, and <a class="el" href="a06677.html#l00052">NLMISC::CVector2f::y</a>.
<p>
<div class="fragment"><pre>00178 {
00179 <span class="keywordtype">float</span> Aa = (a0.y - a1.y) / (a0.x - a1.x);
00180 <span class="keywordtype">float</span> Ba = a0.y - a0.x * Aa;
00181 <span class="keywordtype">float</span> Ab = (b0.y - b1.y) / (b0.x - b1.x);
00182 <span class="keywordtype">float</span> Bb = b0.y - b0.x * Ab;
00183
00184 <span class="comment">// Intersection </span>
00185 CVector2f intersection;
00186 intersection.x = (Bb - Ba) / (Aa - Ab);
00187 intersection.y = Aa * intersection.x + Ba;
00188
00189 <span class="comment">// In it ?</span>
00190 <span class="keywordflow">return</span> ( ( (a0-intersection)*(a1-intersection) < 0 ) && ( (b0-intersection)*(b1-intersection) < 0 ) );
00191 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CPolygone2" doxytag="NLMISC::CPolygon::toConvexPolygonsInCone" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::toConvexPolygonsInCone </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="a03128.html">CVector</a> > & </td>
<td class="mdname" nowrap> <em>vertex</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>a</em>, </td>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>b</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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<p>
Definition at line <a class="el" href="a06190.html#l00351">351</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06190.html#l00337">toConvexPolygonsLeft()</a>, <a class="el" href="a06190.html#l00344">toConvexPolygonsLeftOn()</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00375">toConvexPolygonsDiagonal()</a>.
<p>
<div class="fragment"><pre>00352 {
00353 <span class="comment">// Prev and next</span>
00354 <a class="code" href="a04558.html#a15">uint</a> a0 = a+1;
00355 <span class="keywordflow">if</span> (a0==vertex.size())
00356 a0=0;
00357 <a class="code" href="a04558.html#a15">uint</a> a1;
00358 <span class="keywordflow">if</span> (a==0)
00359 a1=vertex.size()-1;
00360 <span class="keywordflow">else</span>
00361 a1= a-1;
00362
00363 <span class="keywordflow">if</span> (<a class="code" href="a03100.html#NLMISC_1_1CPolygone4">toConvexPolygonsLeftOn</a> (vertex, a, a1, a0) )
00364 {
00365 <span class="keywordflow">return</span> <a class="code" href="a03100.html#NLMISC_1_1CPolygone3">toConvexPolygonsLeft</a> ( vertex, a, b, a0) && <a class="code" href="a03100.html#NLMISC_1_1CPolygone3">toConvexPolygonsLeft</a> ( vertex, b, a, a1);
00366 }
00367 <span class="keywordflow">else</span>
00368 {
00369 <span class="keywordflow">return</span> !( <a class="code" href="a03100.html#NLMISC_1_1CPolygone3">toConvexPolygonsLeft</a> ( vertex, a, b, a1) && <a class="code" href="a03100.html#NLMISC_1_1CPolygone3">toConvexPolygonsLeft</a> ( vertex, b, a, a0) );
00370 }
00371 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CPolygone3" doxytag="NLMISC::CPolygon::toConvexPolygonsLeft" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::toConvexPolygonsLeft </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="a03128.html">CVector</a> > & </td>
<td class="mdname" nowrap> <em>vertex</em>, </td>
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<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>a</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>b</em>, </td>
</tr>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>c</em></td>
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<tr>
<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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<p>
<p>
Definition at line <a class="el" href="a06190.html#l00337">337</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00351">toConvexPolygonsInCone()</a>.
<p>
<div class="fragment"><pre>00338 {
00339 <span class="keywordflow">return</span> ( (vertex[b].x - vertex[a].x) * (vertex[c].y - vertex[a].y) - (vertex[c].x - vertex[a].x) * (vertex[b].y - vertex[a].y) ) < 0;
00340 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CPolygone4" doxytag="NLMISC::CPolygon::toConvexPolygonsLeftOn" ></a><p>
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<td class="md" nowrap valign="top"> bool NLMISC::CPolygon::toConvexPolygonsLeftOn </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const std::vector< <a class="el" href="a03128.html">CVector</a> > & </td>
<td class="mdname" nowrap> <em>vertex</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>a</em>, </td>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>b</em>, </td>
</tr>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a04558.html#a15">uint</a> </td>
<td class="mdname" nowrap> <em>c</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"><code> [static]</code></td>
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<p>
<p>
Definition at line <a class="el" href="a06190.html#l00344">344</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00351">toConvexPolygonsInCone()</a>.
<p>
<div class="fragment"><pre>00345 {
00346 <span class="keywordflow">return</span> ( (vertex[b].x - vertex[a].x) * (vertex[c].y - vertex[a].y) - (vertex[c].x - vertex[a].x) * (vertex[b].y - vertex[a].y) ) <= 0;
00347 }
</pre></div> </td>
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<a class="anchor" name="NLMISC_1_1CPolygona10" doxytag="NLMISC::CPolygon::toConvexPolygonsLocalAndBSP" ></a><p>
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<td class="md" nowrap valign="top"> void NLMISC::CPolygon::toConvexPolygonsLocalAndBSP </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">std::vector< <a class="el" href="a03128.html">CVector</a> > & </td>
<td class="mdname" nowrap> <em>localVertices</em>, </td>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a02292.html">CBSPNode2v</a> & </td>
<td class="mdname" nowrap> <em>root</em>, </td>
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<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>const <a class="el" href="a02851.html">CMatrix</a> & </td>
<td class="mdname" nowrap> <em>basis</em></td>
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<td></td>
<td class="md">) </td>
<td class="md" colspan="2"> const</td>
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<p>
Definition at line <a class="el" href="a06190.html#l00392">392</a> of file <a class="el" href="a06190.html">polygon.cpp</a>.
<p>
References <a class="el" href="a06190.html#l00219">NLMISC::CBSPNode2v::insert()</a>, <a class="el" href="a05972.html#l00914">NLMISC::CMatrix::invert()</a>, <a class="el" href="a06170.html#l00036">NLMISC::CPlane::make()</a>, <a class="el" href="a06190.html#l00173">NLMISC::TCConcavePolygonsVertexMap</a>, <a class="el" href="a05981.html#l00105">uint</a>, <a class="el" href="a06673.html#l00051">NLMISC::CVector::x</a>, and <a class="el" href="a06673.html#l00051">NLMISC::CVector::y</a>.
<p>
Referenced by <a class="el" href="a06190.html#l00624">chain()</a>, and <a class="el" href="a06190.html#l00440">toConvexPolygons()</a>.
<p>
<div class="fragment"><pre>00393 {
00394 <span class="comment">// Invert matrix</span>
00395 <a class="code" href="a02851.html">CMatrix</a> invert = basis;
00396 invert.<a class="code" href="a02851.html#NLMISC_1_1CMatrixz1967_0">invert</a> ();
00397
00398 <span class="comment">// Insert vertices in an ordered table</span>
00399 <a class="code" href="a04558.html#a15">uint</a> vertexCount = <a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size();
00400 <a class="code" href="a05378.html#a33">TCConcavePolygonsVertexMap</a> vertexMap;
00401 localVertices.resize (vertexCount);
00402 <a class="code" href="a04558.html#a15">uint</a> i, j;
00403
00404 <span class="comment">// Transform the vertex</span>
00405 <span class="keywordflow">for</span> (i=0; i<vertexCount; i++)
00406 {
00407 CVector local = invert*<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>[i];
00408 localVertices[i] = CVector (local.x, local.y, 0);
00409 }
00410
00411 <span class="comment">// Plane direction</span>
00412 i=0;
00413 j=<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size()-1;
00414 CVector normal = localVertices[i] - localVertices[j];
00415 normal = normal ^ CVector::K;
00416 CPlane clipPlane;
00417 clipPlane.make(normal, localVertices[i]);
00418
00419 <span class="comment">// Build the BSP root</span>
00420 root = <a class="code" href="a02292.html">CBSPNode2v</a> (clipPlane, localVertices[i], localVertices[j], i, j);
00421
00422 <span class="comment">// Insert all others edges</span>
00423 j=i++;
00424 <span class="keywordflow">for</span> (; i<<a class="code" href="a03100.html#NLMISC_1_1CPolygono0">Vertices</a>.size(); i++)
00425 {
00426 <span class="comment">// Plane direction</span>
00427 normal = localVertices[i] - localVertices[j];
00428 normal = normal ^ CVector::K;
00429 clipPlane.make(normal, localVertices[i]);
00430
00431 <span class="comment">// Build the BSP root</span>
00432 root.<a class="code" href="a02292.html#NLMISC_1_1CBSPNode2va2">insert</a> ( <span class="keyword">new</span> CBSPNode2v (clipPlane, localVertices[i], localVertices[j], i, j) );
00433
00434 j=i;
00435 }
00436 }
</pre></div> </td>
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<hr><h2>Field Documentation</h2>
<a class="anchor" name="NLMISC_1_1CPolygono0" doxytag="NLMISC::CPolygon::Vertices" ></a><p>
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<td class="md" nowrap valign="top"> std::vector<<a class="el" href="a03128.html">CVector</a>> <a class="el" href="a03100.html#NLMISC_1_1CPolygono0">NLMISC::CPolygon::Vertices</a>
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<p>
<p>
Definition at line <a class="el" href="a06191.html#l00055">55</a> of file <a class="el" href="a06191.html">polygon.h</a>.
<p>
Referenced by <a class="el" href="a05929.html#l00714">NLPACS::CLocalRetriever::build3dSurfacePolygons()</a>, <a class="el" href="a05929.html#l00655">NLPACS::CLocalRetriever::buildSurfacePolygons()</a>, <a class="el" href="a06190.html#l00624">chain()</a>, <a class="el" href="a06737.html#l01130">NL3D::CWaterModel::clip()</a>, <a class="el" href="a06193.html#l00083">NL3D::CPortal::clipPyramid()</a>, <a class="el" href="a06737.html#l01054">NL3D::CWaterModel::computeClippedPoly()</a>, <a class="el" href="a06737.html#l01026">NL3D::CWaterModel::computeSimpleClippedPoly()</a>, <a class="el" href="a06768.html#l03563">NL3D::CZoneLighter::computeTileFlagsForPositionTowardWater()</a>, <a class="el" href="a06350.html#l01224">NL3D::CInstanceGroup::displayDebugClusters()</a>, <a class="el" href="a06737.html#l01170">NL3D::CWaterModel::doSimpleRender()</a>, <a class="el" href="a06737.html#l00387">NL3D::DrawPoly2D()</a>, <a class="el" href="a06741.html#l00609">NL3D::CWaterShape::getShapeInWorldSpace()</a>, <a class="el" href="a06768.html#l02927">NL3D::CZoneLighter::lightWater()</a>, <a class="el" href="a06190.html#l00440">toConvexPolygons()</a>, and <a class="el" href="a06737.html#l00437">NL3D::CWaterModel::traverseRender()</a>. </td>
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<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a06191.html">polygon.h</a><li><a class="el" href="a06190.html">polygon.cpp</a></ul>
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