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<hr><h1>quad_effect.cpp</h1><a href="quad__effect_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00007 <font class="comment">/* Copyright, 2000, 2001 Nevrax Ltd.</font>
00008 <font class="comment"> *</font>
00009 <font class="comment"> * This file is part of NEVRAX NEL.</font>
00010 <font class="comment"> * NEVRAX NEL is free software; you can redistribute it and/or modify</font>
00011 <font class="comment"> * it under the terms of the GNU General Public License as published by</font>
00012 <font class="comment"> * the Free Software Foundation; either version 2, or (at your option)</font>
00013 <font class="comment"> * any later version.</font>
00014 <font class="comment"></font>
00015 <font class="comment"> * NEVRAX NEL is distributed in the hope that it will be useful, but</font>
00016 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00017 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</font>
00018 <font class="comment"> * General Public License for more details.</font>
00019 <font class="comment"></font>
00020 <font class="comment"> * You should have received a copy of the GNU General Public License</font>
00021 <font class="comment"> * along with NEVRAX NEL; see the file COPYING. If not, write to the</font>
00022 <font class="comment"> * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,</font>
00023 <font class="comment"> * MA 02111-1307, USA.</font>
00024 <font class="comment"> */</font>
00025
00026 <font class="preprocessor">#include "<a class="code" href="std3d_8h.html">std3d.h</a>"</font>
00027
00028 <font class="preprocessor">#include "<a class="code" href="quad__effect_8h.html">3d/quad_effect.h</a>"</font>
00029 <font class="preprocessor">#include <algorithm></font>
00030 <font class="preprocessor">#include <deque></font>
00031
00032 <font class="keyword">namespace </font>NL3D
00033 {
00034
00035 <font class="comment">// a 2d edge, ordered so that p1 is the highest point of the edge</font>
<a name="l00036"></a><a class="code" href="structNL3D_1_1CEdge.html">00036</a> <font class="keyword">struct </font>CEdge
00037 {
<a name="l00038"></a><a class="code" href="structNL3D_1_1CEdge.html#a0">00038</a> <a class="code" href="structNL3D_1_1CEdge.html#a0">CEdge</a>(<font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CVector2f.html">NLMISC::CVector2f</a> &p1, <font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CVector2f.html">NLMISC::CVector2f</a> &p2)
00039 {
00040 <font class="keywordflow">if</font> (p1.<a class="code" href="classNLMISC_1_1CVector2f.html#m1">y</a> < p2.<a class="code" href="classNLMISC_1_1CVector2f.html#m1">y</a>)
00041 {
00042 <a class="code" href="structNL3D_1_1CEdge.html#m0">P1</a> = p1;
00043 <a class="code" href="structNL3D_1_1CEdge.html#m1">P2</a> = p2;
00044 }
00045 <font class="keywordflow">else</font>
00046 {
00047 <a class="code" href="structNL3D_1_1CEdge.html#m1">P2</a> = p1;
00048 <a class="code" href="structNL3D_1_1CEdge.html#m0">P1</a> = p2;
00049 }
00050 }
00051
<a name="l00052"></a><a class="code" href="structNL3D_1_1CEdge.html#m1">00052</a> <a class="code" href="classNLMISC_1_1CVector2f.html">NLMISC::CVector2f</a> <a class="code" href="structNL3D_1_1CEdge.html#m0">P1</a>, <a class="code" href="structNL3D_1_1CEdge.html#m1">P2</a>;
00053 };
00054
00055 <font class="comment">// compares 2 edge, and take the highest</font>
00056 <font class="keywordtype">bool</font> <a class="code" href="namespaceNL3D.html#a424">operator<</a>(<font class="keyword">const</font> CEdge &e1, <font class="keyword">const</font> CEdge &e2) { <font class="keywordflow">return</font> e1.P1.y < e2.P1.y; }
00057
00058 <font class="keyword">typedef</font> std::deque<CEdge> <a class="code" href="namespaceNL3D.html#a223">TEdgeList</a>;
00059
00060
<a name="l00061"></a><a class="code" href="classNL3D_1_1CQuadEffect.html#d0">00061</a> <font class="keywordtype">void</font> CQuadEffect::makeRasters(<font class="keyword">const</font> TPoint2DVect &poly
00062 , <font class="keywordtype">float</font> quadWidth, <font class="keywordtype">float</font> quadHeight
00063 , TRasters &dest, <font class="keywordtype">float</font> &startY
00064 )
00065 {
00066
00067 dest.clear();
00068 <font class="keyword">const</font> <font class="keywordtype">float</font> epsilon = 10E-5f;
00069
00070 sint size = poly.size();
00071 uint aelSize = 0; <font class="comment">// size of active edge list</font>
00072
00073 sint k; <font class="comment">// loop counter</font>
00074
00075
00076
00077 dest.clear();
00078
00079 <font class="keywordflow">if</font> (!size) <font class="keywordflow">return</font>;
00080
00081 <font class="keyword">static</font> <a class="code" href="namespaceNL3D.html#a223">TEdgeList</a> lel, ael; <font class="comment">// the left edge list, and the active edge list</font>
00082 <font class="keywordtype">float</font> highest = poly[0].y;
00083 lel.clear();
00084 ael.clear();
00085
00087
00088 <font class="keywordflow">for</font> (k = 0; k < size; ++k)
00089 {
00090
00091 lel.push_front(
00092 CEdge(poly[k], poly[k == (size - 1) ? 0 : k + 1])
00093 );
00094 <font class="keywordflow">if</font> (poly[k].y < highest) { highest = poly[k].y; }
00095 }
00096
00098 std::sort(lel.begin(), lel.end());
00099
00100 <font class="keywordtype">bool</font> borderFound;
00101 <font class="keywordtype">float</font> left, right, inter, diff;
00102 <font class="keywordtype">float</font> currY = highest;
00103 startY = highest;
00104
00105 TEdgeList::iterator elIt;
00106
00107 <font class="keywordflow">do</font>
00108 {
00110 <font class="keywordflow">while</font> (size
00111 && lel.begin()->P1.y < (currY + quadHeight)
00112 )
00113 {
00114 ael.push_front(lel.front());
00115 lel.pop_front();
00116 --size;
00117 ++ aelSize;
00118 }
00119
00120 <font class="keywordflow">if</font> (aelSize)
00121 {
00122
00123 borderFound = <font class="keyword">false</font>;
00124
00125 <font class="keywordflow">for</font> (elIt = ael.begin(); elIt != ael.end();)
00126 {
00127 <font class="keywordflow">if</font> (elIt->P2.y <= currY)
00128 {
00129 <font class="comment">// edge has gone out of active edge list</font>
00130 elIt = ael.erase(elIt);
00131 <font class="keywordflow">if</font> (! --aelSize) <font class="keywordflow">return</font>;
00132 <font class="keywordflow">continue</font>;
00133 }
00134 <font class="keywordflow">else</font>
00135 {
00136
00141
00142 <font class="keywordflow">if</font> (elIt->P1.y >= currY)
00143 {
00144 <font class="keywordflow">if</font> (!borderFound)
00145 {
00146 left = right = elIt->P1.x;
00147 borderFound = <font class="keyword">true</font>;
00148 }
00149 <font class="keywordflow">else</font>
00150 {
00151 left = <a class="code" href="bit__set_8cpp.html#a0">std::min</a>(left, elIt->P1.x);
00152 right = std::max(right, elIt->P1.x);
00153 }
00154 }
00155 <font class="keywordflow">else</font>
00156 {
00157 <font class="comment">// compute intersection</font>
00158 diff = elIt->P2.y - elIt->P1.y;
00159 <font class="keywordflow">if</font> (diff > epsilon)
00160 {
00161 inter = elIt->P1.x + (elIt->P2.x - elIt->P1.x) * (currY - elIt->P1.y) / diff;
00162 }
00163 <font class="keywordflow">else</font>
00164 {
00165 inter = elIt->P2.x;
00166 }
00167
00168 <font class="keywordflow">if</font> (!borderFound)
00169 {
00170 left = right = inter;
00171 borderFound = <font class="keyword">true</font>;
00172 }
00173 <font class="keywordflow">else</font>
00174 {
00175 left = <a class="code" href="bit__set_8cpp.html#a0">std::min</a>(left, inter);
00176 right = std::max(right, inter);
00177 }
00178 }
00179
00181
00182 <font class="keywordflow">if</font> (elIt->P2.y <= currY + quadHeight)
00183 {
00184 <font class="keywordflow">if</font> (!borderFound)
00185 {
00186 left = right = elIt->P2.x;
00187 borderFound = <font class="keyword">true</font>;
00188 }
00189 <font class="keywordflow">else</font>
00190 {
00191 left = <a class="code" href="bit__set_8cpp.html#a0">std::min</a>(left, elIt->P2.x);
00192 right = std::max(right, elIt->P2.x);
00193 }
00194 }
00195 <font class="keywordflow">else</font>
00196 {
00197 <font class="comment">// compute intersection</font>
00198 diff = elIt->P2.y - elIt->P1.y;
00199 <font class="keywordflow">if</font> (diff > epsilon)
00200 {
00201 inter = elIt->P1.x + (elIt->P2.x - elIt->P1.x) * (currY + quadHeight - elIt->P1.y) / diff;
00202 }
00203 <font class="keywordflow">else</font>
00204 {
00205 inter = elIt->P2.x;
00206 }
00207
00208 <font class="keywordflow">if</font> (!borderFound)
00209 {
00210 left = right = inter;
00211 borderFound = <font class="keyword">true</font>;
00212 }
00213 <font class="keywordflow">else</font>
00214 {
00215 left = <a class="code" href="bit__set_8cpp.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 } <font class="keywordflow">while</font> (size || aelSize);
00230 }
00231
00232 <font class="comment">//**</font>
00233
<a name="l00234"></a><a class="code" href="classNL3D_1_1CQuadEffect.html#d1">00234</a> <font class="keywordtype">void</font> CQuadEffect::processPoly(<font class="keyword">const</font> TPoint2DVect &poly
00235 , <font class="keywordtype">float</font> quadWidth, <font class="keywordtype">float</font> quadHeight
00236 , TPoint2DVect &dest
00237 )
00238 {
00239 <font class="keyword">static</font> <a class="code" href="classNL3D_1_1CQuadEffect.html#s1">TRasters</a> rDest;
00240 <font class="keywordtype">float</font> currY;
00241 <a class="code" href="classNL3D_1_1CQuadEffect.html#d0">makeRasters</a>(poly, quadWidth, quadHeight, rDest, currY);
00242 <font class="keywordflow">if</font> (dest.size())
00243 {
00244 TRasters::const_iterator it, endIt = rDest.end();
00245 <font class="keywordflow">for</font> (it = rDest.begin(); it != endIt; ++it)
00246 {
00247 <font class="keyword">const</font> sint nbQuad = (sint) ceilf( (it->second - it->first) / quadWidth);
00248 <font class="keywordtype">float</font> currX = it->first;
00249 <font class="keywordflow">for</font> (sint k = 0; k < nbQuad; ++k)
00250 {
00251 dest.push_back(<a class="code" href="classNLMISC_1_1CVector2f.html">NLMISC::CVector2f</a>(currX, currY));
00252 currX += quadWidth;
00253 }
00254 currY += quadHeight;
00255 }
00256 }
00257 }
00258
00259
00260 } <font class="comment">// NL3D</font>
</pre></div>
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