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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>NeL: NL3D::CQuadEffect class Reference</title>
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<h1>NL3D::CQuadEffect Class Reference</h1><code>#include <<a class="el" href="a06299.html">quad_effect.h</a>></code>
<p>
<hr><a name="_details"></a><h2>Detailed Description</h2>
This class allow to create a sequence of small quads that tesselate a poly. <dl compact><dt><b>Author:</b></dt><dd>Nicolas Vizerie <p>
Nevrax France </dd></dl>
<dl compact><dt><b>Date:</b></dt><dd>2001 </dd></dl>
<p>
<p>
Definition at line <a class="el" href="a06299.html#l00046">46</a> of file <a class="el" href="a06299.html">quad_effect.h</a>.<table border=0 cellpadding=0 cellspacing=0>
<tr><td></td></tr>
<tr><td colspan=2><br><h2>Public Types</h2></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>typedef std::vector< <a class="el" href="a03660.html">NLMISC::CVector2f</a> > </td><td class="memItemRight" valign=bottom><a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">a vector of 2d points <a href="#NL3D_1_1CQuadEffectw0"></a><br><br></td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>typedef std::vector< std::pair<<br>
float, float > > </td><td class="memItemRight" valign=bottom><a class="el" href="a03271.html#NL3D_1_1CQuadEffectw1">TRasters</a></td></tr>
<tr><td colspan=2><br><h2>Static 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="a03271.html#NL3D_1_1CQuadEffecte0">makeRasters</a> (const <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a> &poly, float quadWidth, float quadHeight, <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw1">TRasters</a> &dest, float &startY)</td></tr>
<tr><td class="memItemLeft" nowrap align=right valign=top>void </td><td class="memItemRight" valign=bottom><a class="el" href="a03271.html#NL3D_1_1CQuadEffecte1">processPoly</a> (const <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a> &poly, float quadWidth, float quadHeight, <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a> &dest)</td></tr>
</table>
<hr><h2>Member Typedef Documentation</h2>
<a class="anchor" name="NL3D_1_1CQuadEffectw0" doxytag="NL3D::CQuadEffect::TPoint2DVect" ></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"> typedef std::vector<<a class="el" href="a03660.html">NLMISC::CVector2f</a>> <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">NL3D::CQuadEffect::TPoint2DVect</a>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
a vector of 2d points
<p>
<p>
Definition at line <a class="el" href="a06299.html#l00050">50</a> of file <a class="el" href="a06299.html">quad_effect.h</a>. </td>
</tr>
</table>
<a class="anchor" name="NL3D_1_1CQuadEffectw1" doxytag="NL3D::CQuadEffect::TRasters" ></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"> typedef std::vector< std::pair< float, float> > <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw1">NL3D::CQuadEffect::TRasters</a>
</table>
</td>
</tr>
</table>
<table cellspacing=5 cellpadding=0 border=0>
<tr>
<td>
</td>
<td>
<p>
<p>
Definition at line <a class="el" href="a06299.html#l00053">53</a> of file <a class="el" href="a06299.html">quad_effect.h</a>.
<p>
Referenced by <a class="el" href="a06298.html#l00061">makeRasters()</a>, and <a class="el" href="a06298.html#l00234">processPoly()</a>. </td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="NL3D_1_1CQuadEffecte0" doxytag="NL3D::CQuadEffect::makeRasters" ></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"> void NL3D::CQuadEffect::makeRasters </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a> & </td>
<td class="mdname" nowrap> <em>poly</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>float </td>
<td class="mdname" nowrap> <em>quadWidth</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>float </td>
<td class="mdname" nowrap> <em>quadHeight</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a03271.html#NL3D_1_1CQuadEffectw1">TRasters</a> & </td>
<td class="mdname" nowrap> <em>dest</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>float & </td>
<td class="mdname" nowrap> <em>startY</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>
Make raters from the given clipped polygon. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>poly</em> </td><td>a polygon that describe the area where datas are taken from. </td></tr>
<tr><td valign=top><em>quadWidth</em> </td><td>width of the quad </td></tr>
<tr><td valign=top><em>quadHeight</em> </td><td>height of the quad </td></tr>
<tr><td valign=top><em>dest</em> </td><td>a vector that will be filled with the given rasters </td></tr>
<tr><td valign=top><em>startY</em> </td><td>will be filled with the start y position on screen</td></tr>
</table>
</dl>
<p>
edge is in scope. compute its extreme positions so we need to intersect it with the y = currY and y = currY + quadHeight lines
<p>
Definition at line <a class="el" href="a06298.html#l00061">61</a> of file <a class="el" href="a06298.html">quad_effect.cpp</a>.
<p>
References <a class="el" href="a05484.html#l00038">min</a>, <a class="el" href="a05981.html#l00104">sint</a>, <a class="el" href="a05646.html#l00645">size</a>, <a class="el" href="a06298.html#l00058">NL3D::TEdgeList</a>, <a class="el" href="a06299.html#l00053">TRasters</a>, and <a class="el" href="a05981.html#l00105">uint</a>.
<p>
Referenced by <a class="el" href="a06298.html#l00234">processPoly()</a>.
<p>
<div class="fragment"><pre>00065 {
00066
00067 dest.clear();
00068 <span class="keyword">const</span> <span class="keywordtype">float</span> epsilon = 10E-5f;
00069
00070 <a class="code" href="a04558.html#a14">sint</a> <a class="code" href="a04223.html#a587">size</a> = poly.size();
00071 <a class="code" href="a04558.html#a15">uint</a> aelSize = 0; <span class="comment">// size of active edge list</span>
00072
00073 <a class="code" href="a04558.html#a14">sint</a> k; <span class="comment">// loop counter</span>
00074
00075
00076
00077 dest.clear();
00078
00079 <span class="keywordflow">if</span> (!<a class="code" href="a04223.html#a587">size</a>) <span class="keywordflow">return</span>;
00080
00081 <span class="keyword">static</span> <a class="code" href="a05363.html#a275">TEdgeList</a> lel, ael; <span class="comment">// the left edge list, and the active edge list</span>
00082 <span class="keywordtype">float</span> highest = poly[0].y;
00083 lel.clear();
00084 ael.clear();
00085
00087
00088 <span class="keywordflow">for</span> (k = 0; k < <a class="code" href="a04223.html#a587">size</a>; ++k)
00089 {
00090
00091 lel.push_front(
00092 CEdge(poly[k], poly[k == (size - 1) ? 0 : k + 1])
00093 );
00094 <span class="keywordflow">if</span> (poly[k].y < highest) { highest = poly[k].y; }
00095 }
00096
00098 std::sort(lel.begin(), lel.end());
00099
00100 <span class="keywordtype">bool</span> borderFound;
00101 <span class="keywordtype">float</span> left, right, inter, diff;
00102 <span class="keywordtype">float</span> currY = highest;
00103 startY = highest;
00104
00105 TEdgeList::iterator elIt;
00106
00107 <span class="keywordflow">do</span>
00108 {
00110 <span class="keywordflow">while</span> (<a class="code" href="a04223.html#a587">size</a>
00111 && lel.begin()->P1.y < (currY + quadHeight)
00112 )
00113 {
00114 ael.push_front(lel.front());
00115 lel.pop_front();
00116 --<a class="code" href="a04223.html#a587">size</a>;
00117 ++ aelSize;
00118 }
00119
00120 <span class="keywordflow">if</span> (aelSize)
00121 {
00122
00123 borderFound = <span class="keyword">false</span>;
00124
00125 <span class="keywordflow">for</span> (elIt = ael.begin(); elIt != ael.end();)
00126 {
00127 <span class="keywordflow">if</span> (elIt->P2.y <= currY)
00128 {
00129 <span class="comment">// edge has gone out of active edge list</span>
00130 elIt = ael.erase(elIt);
00131 <span class="keywordflow">if</span> (! --aelSize) <span class="keywordflow">return</span>;
00132 <span class="keywordflow">continue</span>;
00133 }
00134 <span class="keywordflow">else</span>
00135 {
00136
00141
00142 <span class="keywordflow">if</span> (elIt->P1.y >= currY)
00143 {
00144 <span class="keywordflow">if</span> (!borderFound)
00145 {
00146 left = right = elIt->P1.x;
00147 borderFound = <span class="keyword">true</span>;
00148 }
00149 <span class="keywordflow">else</span>
00150 {
00151 left = <a class="code" href="a04061.html#a0">std::min</a>(left, elIt->P1.x);
00152 right = std::max(right, elIt->P1.x);
00153 }
00154 }
00155 <span class="keywordflow">else</span>
00156 {
00157 <span class="comment">// compute intersection</span>
00158 diff = elIt->P2.y - elIt->P1.y;
00159 <span class="keywordflow">if</span> (diff > epsilon)
00160 {
00161 inter = elIt->P1.x + (elIt->P2.x - elIt->P1.x) * (currY - elIt->P1.y) / diff;
00162 }
00163 <span class="keywordflow">else</span>
00164 {
00165 inter = elIt->P2.x;
00166 }
00167
00168 <span class="keywordflow">if</span> (!borderFound)
00169 {
00170 left = right = inter;
00171 borderFound = <span class="keyword">true</span>;
00172 }
00173 <span class="keywordflow">else</span>
00174 {
00175 left = <a class="code" href="a04061.html#a0">std::min</a>(left, inter);
00176 right = std::max(right, inter);
00177 }
00178 }
00179
00181
00182 <span class="keywordflow">if</span> (elIt->P2.y <= currY + quadHeight)
00183 {
00184 <span class="keywordflow">if</span> (!borderFound)
00185 {
00186 left = right = elIt->P2.x;
00187 borderFound = <span class="keyword">true</span>;
00188 }
00189 <span class="keywordflow">else</span>
00190 {
00191 left = <a class="code" href="a04061.html#a0">std::min</a>(left, elIt->P2.x);
00192 right = std::max(right, elIt->P2.x);
00193 }
00194 }
00195 <span class="keywordflow">else</span>
00196 {
00197 <span class="comment">// compute intersection</span>
00198 diff = elIt->P2.y - elIt->P1.y;
00199 <span class="keywordflow">if</span> (diff > epsilon)
00200 {
00201 inter = elIt->P1.x + (elIt->P2.x - elIt->P1.x) * (currY + quadHeight - elIt->P1.y) / diff;
00202 }
00203 <span class="keywordflow">else</span>
00204 {
00205 inter = elIt->P2.x;
00206 }
00207
00208 <span class="keywordflow">if</span> (!borderFound)
00209 {
00210 left = right = inter;
00211 borderFound = <span class="keyword">true</span>;
00212 }
00213 <span class="keywordflow">else</span>
00214 {
00215 left = <a class="code" href="a04061.html#a0">std::min</a>(left, inter);
00216 right = std::max(right, inter);
00217 }
00218 }
00219
00220 }
00221 ++ elIt;
00222 }
00223
00224 dest.push_back(std::make_pair(left, right));
00225 }
00226
00227 currY += quadHeight;
00228
00229 } <span class="keywordflow">while</span> (<a class="code" href="a04223.html#a587">size</a> || aelSize);
00230 }
</pre></div> </td>
</tr>
</table>
<a class="anchor" name="NL3D_1_1CQuadEffecte1" doxytag="NL3D::CQuadEffect::processPoly" ></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"> void NL3D::CQuadEffect::processPoly </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a> & </td>
<td class="mdname" nowrap> <em>poly</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>float </td>
<td class="mdname" nowrap> <em>quadWidth</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap>float </td>
<td class="mdname" nowrap> <em>quadHeight</em>, </td>
</tr>
<tr>
<td class="md" nowrap align="right"></td>
<td></td>
<td class="md" nowrap><a class="el" href="a03271.html#NL3D_1_1CQuadEffectw0">TPoint2DVect</a> & </td>
<td class="mdname" nowrap> <em>dest</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>
Tesselate the given clipped polygon , by using the given quad dimensions The coordinates of the poly are given in screen coordinate. <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign=top><em>poly</em> </td><td>a polygon that describe the area where datas are taken from. </td></tr>
<tr><td valign=top><em>quadWidth</em> </td><td>width of the quad </td></tr>
<tr><td valign=top><em>quadHeight</em> </td><td>height of the quad </td></tr>
<tr><td valign=top><em>dest</em> </td><td>a vector that will contains the pos of all the quads that cover the poly</td></tr>
</table>
</dl>
<p>
Definition at line <a class="el" href="a06298.html#l00234">234</a> of file <a class="el" href="a06298.html">quad_effect.cpp</a>.
<p>
References <a class="el" href="a06298.html#l00061">makeRasters()</a>, <a class="el" href="a05981.html#l00104">sint</a>, and <a class="el" href="a06299.html#l00053">TRasters</a>.
<p>
<div class="fragment"><pre>00238 {
00239 <span class="keyword">static</span> <a class="code" href="a03271.html#NL3D_1_1CQuadEffectw1">TRasters</a> rDest;
00240 <span class="keywordtype">float</span> currY;
00241 <a class="code" href="a03271.html#NL3D_1_1CQuadEffecte0">makeRasters</a>(poly, quadWidth, quadHeight, rDest, currY);
00242 <span class="keywordflow">if</span> (dest.size())
00243 {
00244 TRasters::const_iterator it, endIt = rDest.end();
00245 <span class="keywordflow">for</span> (it = rDest.begin(); it != endIt; ++it)
00246 {
00247 <span class="keyword">const</span> <a class="code" href="a04558.html#a14">sint</a> nbQuad = (<a class="code" href="a04558.html#a14">sint</a>) ceilf( (it->second - it->first) / quadWidth);
00248 <span class="keywordtype">float</span> currX = it->first;
00249 <span class="keywordflow">for</span> (<a class="code" href="a04558.html#a14">sint</a> k = 0; k < nbQuad; ++k)
00250 {
00251 dest.push_back(<a class="code" href="a03660.html">NLMISC::CVector2f</a>(currX, currY));
00252 currX += quadWidth;
00253 }
00254 currY += quadHeight;
00255 }
00256 }
00257 }
</pre></div> </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="a06299.html">quad_effect.h</a><li><a class="el" href="a06298.html">quad_effect.cpp</a></ul>
<hr size="1"><address style="align: right;"><small>Generated on Tue Mar 16 07:33:32 2004 for NeL by
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</a>1.3.6 </small></address>
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