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<hr><h1>polygon.cpp</h1><a href="polygon_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001
00007 <font class="comment">/* Copyright, 2000 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="stdmisc_8h.html">stdmisc.h</a>"</font>
00027
00028 <font class="preprocessor">#include "<a class="code" href="polygon_8h.html">nel/misc/polygon.h</a>"</font>
00029 <font class="preprocessor">#include "<a class="code" href="plane_8h.html">nel/misc/plane.h</a>"</font>
00030 <font class="preprocessor">#include "<a class="code" href="triangle_8h.html">nel/misc/triangle.h</a>"</font>
00031
00032
00033 <font class="keyword">using</font> <font class="keyword">namespace </font>std;
00034 <font class="keyword">using</font> <font class="keyword">namespace </font>NLMISC;
00035
00036
00037 <font class="keyword">namespace </font>NLMISC
00038 {
00039
00040
00041 <font class="comment">//==================================//</font>
00042 <font class="comment">// CPolygon implementation //</font>
00043 <font class="comment">//==================================//</font>
00044
00045 <font class="comment">// ***************************************************************************</font>
<a name="l00046"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a1">00046</a> CPolygon::CPolygon(<font class="keyword">const</font> CVector &a, <font class="keyword">const</font> CVector &b, <font class="keyword">const</font> CVector &c)
00047 {
00048 <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.reserve(3);
00049 <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.push_back(a);
00050 <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.push_back(b);
00051 <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.push_back(c);
00052 }
00053
00054
00055 <font class="comment">// ***************************************************************************</font>
<a name="l00056"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a3">00056</a> <font class="keywordtype">void</font> CPolygon::clip(<font class="keyword">const</font> CPlane *planes, uint nPlanes)
00057 {
00058 <font class="keywordflow">if</font>(nPlanes==0 || <a class="code" href="classNLMISC_1_1CPolygon.html#a2">getNumVertices</a>()==0)
00059 <font class="keywordflow">return</font>;
00060
00061 <font class="comment">// The final polygon has at maximum currentVertices+number of clipping planes.</font>
00062 <font class="comment">// For performance, the vectors are static, so reallocation rarely occurs.</font>
00063 <font class="keyword">static</font> vector<CVector> tab0, tab1;
00064 tab0.resize(<a class="code" href="classNLMISC_1_1CPolygon.html#a2">getNumVertices</a>()+nPlanes);
00065 tab1.resize(<a class="code" href="classNLMISC_1_1CPolygon.html#a2">getNumVertices</a>()+nPlanes);
00066 <font class="comment">// Init tab0 with Vertices.</font>
00067 copy(<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.begin(), <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.end(), tab0.begin());
00068 CVector *<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>=&(*tab0.begin()), *out= &(*tab1.begin());
00069 sint nin= <a class="code" href="classNLMISC_1_1CPolygon.html#a2">getNumVertices</a>(), nout;
00070 <font class="keywordflow">for</font>(sint i=0;i<(sint)nPlanes;i++)
00071 {
00072 nout= planes[i].clipPolygonBack(<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>, out, nin);
00073 swap(<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>, out);
00074 nin= nout;
00075 <font class="keywordflow">if</font>(nin==0)
00076 <font class="keywordflow">break</font>;
00077 }
00078
00079 <font class="comment">// Final result in "in".</font>
00080 <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.resize(nin);
00081 <font class="keywordflow">if</font>(nin>0)
00082 {
00083 memcpy(&(*<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.begin()), <a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>, nin*<font class="keyword">sizeof</font>(CVector));
00084 }
00085 }
00086
00087
00088 <font class="comment">// ***************************************************************************</font>
<a name="l00089"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a4">00089</a> <font class="keywordtype">void</font> CPolygon::clip(<font class="keyword">const</font> std::vector<CPlane> &planes)
00090 {
00091 <font class="keywordflow">if</font>(planes.size()==0)
00092 <font class="keywordflow">return</font>;
00093 <a class="code" href="classNLMISC_1_1CPolygon.html#a3">clip</a>(&(*planes.begin()), planes.size());
00094 }
00095
00096
00097
00098 <font class="comment">// ***************************************************************************</font>
<a name="l00099"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a5">00099</a> <font class="keywordtype">void</font> CPolygon::serial(<a class="code" href="classNLMISC_1_1IStream.html">NLMISC::IStream</a> &f) <font class="keywordflow">throw</font>(NLMISC::EStream)
00100 {
00101 f.serialVersion(0);
00102 f.serialCont(Vertices);
00103 }
00104
00105 <font class="comment">// ***************************************************************************</font>
<a name="l00106"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a8">00106</a> <font class="keywordtype">void</font> CPolygon::getBestTriplet(uint &index0,uint &index1,uint &index2)
00107 {
00108 <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size() >= 3);
00109 uint i, j, k;
00110 <font class="keywordtype">float</font> bestArea = 0.f;
00111 <font class="keyword">const</font> uint numVerts = <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size();
00112 <font class="keywordflow">for</font> (i = 0; i < numVerts; ++i)
00113 {
00114 <font class="keywordflow">for</font> (j = 0; j < numVerts; ++j)
00115 {
00116 <font class="keywordflow">if</font> (i != j)
00117 {
00118 <font class="keywordflow">for</font> (k = 0; k < numVerts; ++k)
00119 {
00120 <font class="keywordflow">if</font> (k != i && k != j)
00121 {
00122 CVector v0 = <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[j] - <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i];
00123 CVector v1 = <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[k] - <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i];
00124 <font class="keywordtype">float</font> area = (v0 ^ v1).norm();
00125 <font class="keywordflow">if</font> (area > bestArea)
00126 {
00127 bestArea = area;
00128 index0 = i;
00129 index1 = j;
00130 index2 = k;
00131 }
00132 }
00133 }
00134 }
00135 }
00136 }
00137
00138 }
00139
00140 <font class="comment">// ***************************************************************************</font>
<a name="l00141"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a9">00141</a> <font class="keywordtype">void</font> CPolygon::buildBasis(CMatrix &dest)
00142 {
00143 <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size() > 3);
00144 uint i1, i2, i3;
00145 <a class="code" href="classNLMISC_1_1CPolygon.html#a8">getBestTriplet</a>(i1, i2, i3);
00146 CVector v1 = (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i2] - <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i1]).normed();
00147 CVector v2 = (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i3] - <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i1]).normed();
00148 CVector K = v2 ^ v1;
00149 CVector I = v1 - (v1 * K) * v1;
00150 CVector J = K ^ I;
00151 dest.setRot(I, J, K);
00152 dest.setPos(<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i1]);
00153 }
00154
00155 <font class="comment">// ***************************************************************************</font>
00156
<a name="l00157"></a><a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html">00157</a> <font class="keyword">class </font>CConcavePolygonsVertexDesc
00158 {
00159 <font class="keyword">public</font>:
00160
<a name="l00161"></a><a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#a0">00161</a> <a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#a0">CConcavePolygonsVertexDesc</a> (<font class="keywordtype">float</font> length, uint <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>)
00162 {
00163 <a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#m0">Length</a> = length;
00164 <a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#m1">Index</a> = <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>;
00165 }
00166
00167 <font class="comment">// Length > 0</font>
<a name="l00168"></a><a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#m0">00168</a> <font class="keywordtype">float</font> <a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#m0">Length</a>;
00169
00170 <font class="comment">// First vertex index</font>
<a name="l00171"></a><a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#m1">00171</a> uint <a class="code" href="classNLMISC_1_1CConcavePolygonsVertexDesc.html#m1">Index</a>;
00172 };
00173 <font class="keyword">typedef</font> std::map<float, CConcavePolygonsVertexDesc> <a class="code" href="namespaceNLMISC.html#a199">TCConcavePolygonsVertexMap</a>;
00174
00175 <font class="comment">// ***************************************************************************</font>
00176
<a name="l00177"></a><a class="code" href="classNLMISC_1_1CPolygon.html#d0">00177</a> <font class="keywordtype">bool</font> CPolygon::toConvexPolygonsEdgeIntersect (<font class="keyword">const</font> CVector2f& a0, <font class="keyword">const</font> CVector2f& a1, <font class="keyword">const</font> CVector2f& b0, <font class="keyword">const</font> CVector2f& b1)
00178 {
00179 <font class="keywordtype">float</font> Aa = (a0.y - a1.y) / (a0.x - a1.x);
00180 <font class="keywordtype">float</font> Ba = a0.y - a0.x * Aa;
00181 <font class="keywordtype">float</font> Ab = (b0.y - b1.y) / (b0.x - b1.x);
00182 <font class="keywordtype">float</font> Bb = b0.y - b0.x * Ab;
00183
00184 <font class="comment">// Intersection </font>
00185 CVector2f intersection;
00186 intersection.x = (Bb - Ba) / (Aa - Ab);
00187 intersection.y = Aa * intersection.x + Ba;
00188
00189 <font class="comment">// In it ?</font>
00190 <font class="keywordflow">return</font> ( ( (a0-intersection)*(a1-intersection) < 0 ) && ( (b0-intersection)*(b1-intersection) < 0 ) );
00191 }
00192
00193 <font class="comment">// ***************************************************************************</font>
00194
<a name="l00195"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html">00195</a> <font class="keyword">class </font>CBSPNode2v
00196 {
00197 <font class="keyword">public</font>:
<a name="l00198"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">00198</a> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">CBSPNode2v</a> ()
00199 {
00200 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a> = NULL;
00201 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a> = NULL;
00202 }
<a name="l00203"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#a1">00203</a> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">CBSPNode2v</a> ( <font class="keyword">const</font> CPlane &plane, CVector p0, CVector p1, uint v0, uint v1 ) : <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a> (plane), <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m4">P0</a> (p0), <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m5">P1</a> (p1)
00204 {
00205 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a> = NULL;
00206 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a> = NULL;
00207 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m2">Parent</a> = NULL;
00208 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m6">V0</a> = v0;
00209 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m7">V1</a> = v1;
00210 }
<a name="l00211"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#a2">00211</a> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a2">~CBSPNode2v</a> ()
00212 {
00213 <font class="keywordflow">if</font> (Front)
00214 <font class="keyword">delete</font> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a>;
00215 <font class="keywordflow">if</font> (Back)
00216 <font class="keyword">delete</font> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a>;
00217 }
00218
<a name="l00219"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#a3">00219</a> <font class="keywordtype">void</font> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a3">insert</a> (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">CBSPNode2v</a> *node)
00220 {
00221 <font class="comment">// Front ?</font>
00222 <font class="keywordtype">bool</font> p0Front = (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a> * node->P0) > 0;
00223 <font class="keywordtype">bool</font> p1Front = (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a> * node->P1) > 0;
00224 <font class="keywordflow">if</font> (p0Front && p1Front)
00225 {
00226 <font class="comment">// Front child ?</font>
00227 <font class="keywordflow">if</font> (Front)
00228 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a>->insert (node);
00229 <font class="keywordflow">else</font>
00230 {
00231 <font class="comment">// Link left</font>
00232 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a> = node;
00233 node->Parent = <font class="keyword">this</font>;
00234 }
00235 }
00236 <font class="keywordflow">else</font> <font class="keywordflow">if</font> ((!p0Front) && (!p1Front))
00237 {
00238 <font class="comment">// Back child ?</font>
00239 <font class="keywordflow">if</font> (Back)
00240 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a>->insert (node);
00241 <font class="keywordflow">else</font>
00242 {
00243 <font class="comment">// Link left</font>
00244 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a> = node;
00245 node->Parent = <font class="keyword">this</font>;
00246 }
00247 }
00248 <font class="keywordflow">else</font>
00249 {
00250 <font class="comment">// Split vertex</font>
00251 CVector newVertex = <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a>.intersect (node->P0, node->P1);
00252
00253 <font class="comment">// New node</font>
00254 <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">CBSPNode2v</a> *newNode = <font class="keyword">new</font> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">CBSPNode2v</a> (node->Plane, node->P0, newVertex, node->V0, node->V1);
00255
00256 <font class="comment">// Old node</font>
00257 node->P0 = newVertex;
00258
00259 <font class="comment">// Insert child</font>
00260 CBSPNode2v **p0Parent;
00261 CBSPNode2v **p1Parent;
00262
00263 <font class="comment">// Get insertion pointer</font>
00264 <font class="keywordflow">if</font> (p0Front)
00265 {
00266 p0Parent = &<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a>;
00267 p1Parent = &<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a>;
00268 }
00269 <font class="keywordflow">else</font>
00270 {
00271 p0Parent = &<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a>;
00272 p1Parent = &<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a>;
00273 }
00274
00275 <font class="comment">// Insert children</font>
00276 <font class="keywordflow">if</font> (*p0Parent)
00277 {
00278 (*p0Parent)->insert (newNode);
00279 }
00280 <font class="keywordflow">else</font>
00281 {
00282 *p0Parent = newNode;
00283 newNode->Parent = <font class="keyword">this</font>;
00284 }
00285
00286 <font class="comment">// Insert children</font>
00287 <font class="keywordflow">if</font> (*p1Parent)
00288 {
00289 (*p1Parent)->insert (node);
00290 }
00291 <font class="keywordflow">else</font>
00292 {
00293 *p1Parent = node;
00294 node->Parent = <font class="keyword">this</font>;
00295 }
00296 }
00297 }
00298
<a name="l00299"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#a4">00299</a> <font class="keywordtype">bool</font> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a4">intersect</a> (<font class="keyword">const</font> CVector &p0, <font class="keyword">const</font> CVector &p1, uint v0, uint v1)<font class="keyword"> const</font>
00300 <font class="keyword"> </font>{
00301 <font class="comment">// Front ?</font>
00302 <font class="keywordtype">bool</font> p0Front = (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a> * p0) > 0;
00303 <font class="keywordtype">bool</font> p1Front = (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a> * p1) > 0;
00304
00305 <font class="keywordflow">if</font> (p0Front != p1Front)
00306 <font class="keywordflow">if</font> ( (v0 != <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m6">V0</a>) && (v0 != <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m7">V1</a>) && (v1 != <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m6">V0</a>) && (v1 != <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m7">V1</a>) )
00307 <font class="keywordflow">if</font> (CPolygon::toConvexPolygonsEdgeIntersect ((CVector2f) <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m4">P0</a>, (CVector2f) <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m5">P1</a>, (CVector2f) p0, (CVector2f) p1))
00308 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00309
00310 <font class="keywordflow">if</font> (p0Front || p1Front)
00311 {
00312 <font class="keywordflow">if</font> (Front)
00313 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a>->intersect (p0, p1, v0, v1))
00314 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00315 }
00316
00317 <font class="keywordflow">if</font> ((!p0Front) || (!p1Front))
00318 {
00319 <font class="keywordflow">if</font> (Back)
00320 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a>->intersect (p0, p1, v0, v1))
00321 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00322 }
00323
00324 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00325 }
00326
<a name="l00327"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#m2">00327</a> <a class="code" href="classNLMISC_1_1CBSPNode2v.html#a0">CBSPNode2v</a> *<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m0">Back</a>, *<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m1">Front</a>, *<a class="code" href="classNLMISC_1_1CBSPNode2v.html#m2">Parent</a>;
<a name="l00328"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">00328</a> CPlane <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m3">Plane</a>;
<a name="l00329"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#m4">00329</a> CVector <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m4">P0</a>;
<a name="l00330"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#m5">00330</a> CVector <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m5">P1</a>;
<a name="l00331"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#m6">00331</a> uint <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m6">V0</a>;
<a name="l00332"></a><a class="code" href="classNLMISC_1_1CBSPNode2v.html#m7">00332</a> uint <a class="code" href="classNLMISC_1_1CBSPNode2v.html#m7">V1</a>;
00333 };
00334
00335 <font class="comment">// ***************************************************************************</font>
00336
<a name="l00337"></a><a class="code" href="classNLMISC_1_1CPolygon.html#d1">00337</a> <font class="keywordtype">bool</font> CPolygon::toConvexPolygonsLeft (<font class="keyword">const</font> std::vector<CVector> &vertex, uint a, uint b, uint c)
00338 {
00339 <font class="keywordflow">return</font> ( (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 }
00341
00342 <font class="comment">// ***************************************************************************</font>
00343
<a name="l00344"></a><a class="code" href="classNLMISC_1_1CPolygon.html#d2">00344</a> <font class="keywordtype">bool</font> CPolygon::toConvexPolygonsLeftOn (<font class="keyword">const</font> std::vector<CVector> &vertex, uint a, uint b, uint c)
00345 {
00346 <font class="keywordflow">return</font> ( (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 }
00348
00349 <font class="comment">// ***************************************************************************</font>
00350
<a name="l00351"></a><a class="code" href="classNLMISC_1_1CPolygon.html#d3">00351</a> <font class="keywordtype">bool</font> CPolygon::toConvexPolygonsInCone (<font class="keyword">const</font> std::vector<CVector> &vertex, uint a, uint b)
00352 {
00353 <font class="comment">// Prev and next</font>
00354 uint a0 = a+1;
00355 <font class="keywordflow">if</font> (a0==vertex.size())
00356 a0=0;
00357 uint a1;
00358 <font class="keywordflow">if</font> (a==0)
00359 a1=vertex.size()-1;
00360 <font class="keywordflow">else</font>
00361 a1= a-1;
00362
00363 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon.html#d2">toConvexPolygonsLeftOn</a> (vertex, a, a1, a0) )
00364 {
00365 <font class="keywordflow">return</font> <a class="code" href="classNLMISC_1_1CPolygon.html#d1">toConvexPolygonsLeft</a> ( vertex, a, b, a0) && <a class="code" href="classNLMISC_1_1CPolygon.html#d1">toConvexPolygonsLeft</a> ( vertex, b, a, a1);
00366 }
00367 <font class="keywordflow">else</font>
00368 {
00369 <font class="keywordflow">return</font> !( <a class="code" href="classNLMISC_1_1CPolygon.html#d1">toConvexPolygonsLeft</a> ( vertex, a, b, a1) && <a class="code" href="classNLMISC_1_1CPolygon.html#d1">toConvexPolygonsLeft</a> ( vertex, b, a, a0) );
00370 }
00371 }
00372
00373 <font class="comment">// ***************************************************************************</font>
00374
<a name="l00375"></a><a class="code" href="classNLMISC_1_1CPolygon.html#d4">00375</a> <font class="keywordtype">bool</font> CPolygon::toConvexPolygonsDiagonal (<font class="keyword">const</font> std::vector<CVector> &vertex, <font class="keyword">const</font> CBSPNode2v &bsp, uint a, uint b)
00376 {
00377 <font class="comment">// Check it is a border</font>
00378 <font class="keywordflow">if</font> ( ( (b - a) == 1) || ( (a - b) == 1) || ( (a==0) && (b ==(vertex.size()-1))) || ( (b==0) && (a ==(vertex.size()-1))) )
00379 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00380
00381 <font class="comment">// Check visibility</font>
00382 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon.html#d3">toConvexPolygonsInCone</a> (vertex, a, b) && <a class="code" href="classNLMISC_1_1CPolygon.html#d3">toConvexPolygonsInCone</a> (vertex, b, a))
00383 {
00384 <font class="comment">// Intersection ?</font>
00385 <font class="keywordflow">return</font> !bsp.intersect (vertex[a], vertex[b], a, b);
00386 }
00387 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00388 }
00389
00390 <font class="comment">// ***************************************************************************</font>
00391
<a name="l00392"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a10">00392</a> <font class="keywordtype">void</font> CPolygon::toConvexPolygonsLocalAndBSP (std::vector<CVector> &localVertices, CBSPNode2v &root, <font class="keyword">const</font> CMatrix &basis)<font class="keyword"> const</font>
00393 <font class="keyword"></font>{
00394 <font class="comment">// Invert matrix</font>
00395 CMatrix invert = basis;
00396 invert.invert ();
00397
00398 <font class="comment">// Insert vertices in an ordered table</font>
00399 uint vertexCount = <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size();
00400 <a class="code" href="namespaceNLMISC.html#a199">TCConcavePolygonsVertexMap</a> vertexMap;
00401 localVertices.resize (vertexCount);
00402 uint i, j;
00403
00404 <font class="comment">// Transform the vertex</font>
00405 <font class="keywordflow">for</font> (i=0; i<vertexCount; i++)
00406 {
00407 CVector local = invert*<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[i];
00408 localVertices[i] = CVector (local.x, local.y, 0);
00409 }
00410
00411 <font class="comment">// Plane direction</font>
00412 i=0;
00413 j=<a class="code" href="classNLMISC_1_1CPolygon.html#m0">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 <font class="comment">// Build the BSP root</font>
00420 root = CBSPNode2v (clipPlane, localVertices[i], localVertices[j], i, j);
00421
00422 <font class="comment">// Insert all others edges</font>
00423 j=i++;
00424 <font class="keywordflow">for</font> (; i<<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size(); i++)
00425 {
00426 <font class="comment">// Plane direction</font>
00427 normal = localVertices[i] - localVertices[j];
00428 normal = normal ^ CVector::K;
00429 clipPlane.make(normal, localVertices[i]);
00430
00431 <font class="comment">// Build the BSP root</font>
00432 root.insert ( <font class="keyword">new</font> CBSPNode2v (clipPlane, localVertices[i], localVertices[j], i, j) );
00433
00434 j=i;
00435 }
00436 }
00437
00438 <font class="comment">// ***************************************************************************</font>
00439
<a name="l00440"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a6">00440</a> <font class="keywordtype">bool</font> CPolygon::toConvexPolygons (<a class="code" href="classstd_1_1list.html">std::list<CPolygon></a>& outputPolygons, <font class="keyword">const</font> CMatrix& basis)<font class="keyword"> const</font>
00441 <font class="keyword"></font>{
00442 <font class="comment">// Some vertices ?</font>
00443 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size()>2)
00444 {
00445 <font class="comment">// Local vertices</font>
00446 std::vector<CVector> localVertices;
00447
00448 <font class="comment">// Build the BSP root</font>
00449 CBSPNode2v root;
00450
00451 <font class="comment">// Build the local array and the BSP</font>
00452 <a class="code" href="classNLMISC_1_1CPolygon.html#a10">toConvexPolygonsLocalAndBSP</a> (localVertices, root, basis);
00453
00454 <font class="comment">// Build a vertex list</font>
00455 <a class="code" href="classstd_1_1list.html">std::list<uint></a> vertexList;
00456 uint i;
00457 <font class="keywordflow">for</font> (i=0; i<<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size(); i++)
00458 vertexList.push_back (i);
00459
00460 <font class="comment">// Clip ears while there is some polygons</font>
00461 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator current=vertexList.begin();
00462 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator begin=vertexList.begin();
00463 <font class="keywordflow">do</font>
00464 {
00465 again:;
00466 <font class="comment">// Search for a diagonal</font>
00467 <font class="keywordtype">bool</font> found = <font class="keyword">false</font>;
00468
00469 <font class="comment">// Get next vertex</font>
00470 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator first = current;
00471 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator lastPreviousPrevious=current;
00472 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator lastPrevious=current;
00473 lastPrevious++;
00474 <font class="keywordflow">if</font> (lastPrevious==vertexList.end())
00475 lastPrevious = vertexList.begin();
00476 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator currentNext = lastPrevious;
00477 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator last = lastPrevious;
00478 last++;
00479 <font class="keywordflow">if</font> (last==vertexList.end())
00480 last = vertexList.begin();
00481 <font class="keywordflow">while</font> (last != current)
00482 {
00483 <font class="comment">// Is a diagonal ?</font>
00484 <font class="keywordflow">if</font> (
00485 (<a class="code" href="classNLMISC_1_1CPolygon.html#d4">toConvexPolygonsDiagonal</a> (localVertices, root, *lastPreviousPrevious, *last)) &&
00486 (<a class="code" href="classNLMISC_1_1CPolygon.html#d4">toConvexPolygonsDiagonal</a> (localVertices, root, *currentNext, *last)) &&
00487 (<a class="code" href="classNLMISC_1_1CPolygon.html#d4">toConvexPolygonsDiagonal</a> (localVertices, root, *last, *current))
00488 )
00489 {
00490 <font class="comment">// Find one</font>
00491 found = <font class="keyword">true</font>;
00492 }
00493 <font class="keywordflow">else</font>
00494 {
00495 <font class="comment">// Come back</font>
00496 last = lastPrevious;
00497 lastPrevious = lastPreviousPrevious;
00498 <font class="keywordflow">break</font>;
00499 }
00500
00501 <font class="comment">// Next vertex</font>
00502 lastPreviousPrevious = lastPrevious;
00503 lastPrevious = last++;
00504 <font class="keywordflow">if</font> (last==vertexList.end())
00505 last = vertexList.begin();
00506 }
00507
00508 <font class="comment">// Last polygon ?</font>
00509 <font class="keywordflow">if</font> (last==current)
00510 {
00511 <font class="comment">// Add a polygon</font>
00512 outputPolygons.push_back (<a class="code" href="classNLMISC_1_1CPolygon.html#a0">CPolygon</a>());
00513 <a class="code" href="classNLMISC_1_1CPolygon.html#a0">CPolygon</a> &back = outputPolygons.back ();
00514 back.Vertices.reserve (vertexList.size());
00515
00516 <font class="comment">// Add each vertex in the new polygon</font>
00517 current=vertexList.begin();
00518 <font class="keywordflow">while</font> (current!=vertexList.end())
00519 {
00520 back.Vertices.push_back (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[*current]);
00521 current++;
00522 }
00523
00524 <font class="comment">// Exit</font>
00525 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00526 }
00527 <font class="keywordflow">else</font>
00528 {
00529 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator firstNext = current;
00530 <a class="code" href="classstd_1_1list.html">std::list<uint></a>::iterator firstNextNext = currentNext;
00531 <font class="keywordflow">if</font> (first != vertexList.begin())
00532 first--;
00533 <font class="keywordflow">else</font>
00534 {
00535 first = vertexList.end();
00536 first--;
00537 }
00538
00539 <font class="keywordflow">while</font> (current != first)
00540 {
00541 <font class="comment">// Is a diagonal ?</font>
00542 <font class="keywordflow">if</font> (
00543 (<a class="code" href="classNLMISC_1_1CPolygon.html#d4">toConvexPolygonsDiagonal</a> (localVertices, root, *firstNextNext, *first)) &&
00544 (<a class="code" href="classNLMISC_1_1CPolygon.html#d4">toConvexPolygonsDiagonal</a> (localVertices, root, *lastPrevious, *first)) &&
00545 (<a class="code" href="classNLMISC_1_1CPolygon.html#d4">toConvexPolygonsDiagonal</a> (localVertices, root, *last, *first))
00546 )
00547 {
00548 <font class="comment">// Find one</font>
00549 found = <font class="keyword">true</font>;
00550 }
00551 <font class="keywordflow">else</font>
00552 {
00553 <font class="comment">// Come back</font>
00554 first = firstNext;
00555 <font class="keywordflow">break</font>;
00556 }
00557
00558 <font class="comment">// Next vertex</font>
00559 firstNextNext = firstNext;
00560 firstNext = first;
00561 <font class="keywordflow">if</font> (first==vertexList.begin())
00562 {
00563 first = vertexList.end();
00564 first--;
00565 }
00566 <font class="keywordflow">else</font>
00567 first--;
00568 }
00569 }
00570
00571 <font class="comment">// Found ?</font>
00572 <font class="keywordflow">if</font> (found)
00573 {
00574 <font class="comment">// Count vertex</font>
00575 outputPolygons.push_back (<a class="code" href="classNLMISC_1_1CPolygon.html#a0">CPolygon</a>());
00576 <a class="code" href="classNLMISC_1_1CPolygon.html#a0">CPolygon</a> &back = outputPolygons.back ();
00577
00578 <font class="comment">// Vertex count</font>
00579 uint vertexCount = 1;
00580 current = first;
00581 <font class="keywordflow">while</font> (current != last)
00582 {
00583 vertexCount++;
00584 current++;
00585 <font class="keywordflow">if</font> (current == vertexList.end())
00586 current = vertexList.begin();
00587 }
00588
00589 <font class="comment">// Alloc vertices</font>
00590 back.Vertices.reserve (vertexCount);
00591
00592 <font class="comment">// Copy and remove vertices</font>
00593 back.Vertices.push_back (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[*first]);
00594 first++;
00595 <font class="keywordflow">if</font> (first == vertexList.end())
00596 first = vertexList.begin();
00597 <font class="keywordflow">while</font> (first != last)
00598 {
00599 back.Vertices.push_back (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[*first]);
00600
00601 <font class="comment">// Remove from list</font>
00602 first = vertexList.erase (first);
00603 <font class="keywordflow">if</font> (first == vertexList.end())
00604 first = vertexList.begin();
00605 <a class="code" href="debug_8h.html#a6">nlassert</a> (first != vertexList.end());
00606 }
00607 back.Vertices.push_back (<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>[*first]);
00608 current = begin = last;
00609 <font class="keywordflow">goto</font> again;
00610 }
00611
00612 <font class="comment">// Next current</font>
00613 current++;
00614 <font class="keywordflow">if</font> (current == vertexList.end())
00615 current = vertexList.begin ();
00616 }
00617 <font class="keywordflow">while</font> (current != begin);
00618 }
00619 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00620 }
00621
00622 <font class="comment">// ***************************************************************************</font>
00623
<a name="l00624"></a><a class="code" href="classNLMISC_1_1CPolygon.html#a7">00624</a> <font class="keywordtype">bool</font> CPolygon::chain (<font class="keyword">const</font> std::vector<CPolygon> &other, <font class="keyword">const</font> CMatrix& basis)
00625 {
00626 <font class="comment">// Local vertices</font>
00627 std::vector<CVector> localVertices;
00628
00629 <font class="comment">// Build the BSP root</font>
00630 CBSPNode2v root;
00631
00632 <font class="comment">// Build the local array and the BSP</font>
00633 <a class="code" href="classNLMISC_1_1CPolygon.html#a10">toConvexPolygonsLocalAndBSP</a> (localVertices, root, basis);
00634
00635 <font class="comment">// Local vertices</font>
00636 std::vector<std::vector<CVector> > localVerticesOther (other.size());
00637
00638 <font class="comment">// Build the BSP root</font>
00639 std::vector<CBSPNode2v> rootOther (other.size());
00640
00641 <font class="comment">// Build a copy of the polygons</font>
00642 std::vector<CPolygon> copy = other;
00643
00644 <font class="comment">// Main copy</font>
00645 <a class="code" href="classNLMISC_1_1CPolygon.html#a0">CPolygon</a> mainCopy = *<font class="keyword">this</font>;
00646
00647 <font class="comment">// For each other polygons</font>
00648 uint o;
00649 <font class="keywordflow">for</font> (o=0; o<other.size(); o++)
00650 {
00651 <font class="comment">// Build the local array and the BSP</font>
00652 other[o].toConvexPolygonsLocalAndBSP (localVerticesOther[o], rootOther[o], basis);
00653 }
00654
00655 <font class="comment">// Look for a couple..</font>
00656 uint thisCount = <a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.size();
00657 uint i, j;
00658 <font class="keywordflow">for</font> (o=0; o<other.size(); o++)
00659 {
00660 uint otherCount = other[o].Vertices.size();
00661
00662 <font class="comment">// Try to link in the main polygon</font>
00663 <font class="keywordflow">for</font> (i=0; i<thisCount; i++)
00664 {
00665 <font class="keywordflow">for</font> (j=0; j<otherCount; j++)
00666 {
00667 <font class="comment">// Test this segement</font>
00668 <font class="keywordflow">if</font> (!root.intersect (localVertices[i], localVerticesOther[o][j], i, 0xffffffff))
00669 {
00670 <font class="comment">// Test each other polygons</font>
00671 uint otherO;
00672 <font class="keywordflow">for</font> (otherO=0; otherO<other.size(); otherO++)
00673 {
00674 <font class="comment">// Intersect ?</font>
00675 <font class="keywordflow">if</font> (rootOther[otherO].intersect (localVertices[i], localVerticesOther[o][j], 0xffffffff, (otherO == o)?j:0xffffffff))
00676 <font class="keywordflow">break</font>;
00677 }
00678
00679 <font class="comment">// Continue ?</font>
00680 <font class="keywordflow">if</font> (otherO==other.size())
00681 {
00682 <font class="comment">// Insert new vertices</font>
00683 mainCopy.Vertices.insert (mainCopy.Vertices.begin()+i, 2+otherCount, CVector());
00684
00685 <font class="comment">// Copy the first vertex</font>
00686 mainCopy.Vertices[i] = mainCopy.Vertices[i+otherCount+2];
00687
00688 <font class="comment">// Copy the new vertices</font>
00689 uint k;
00690 <font class="keywordflow">for</font> (k=0; k<otherCount; k++)
00691 {
00692 uint <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> = j+k;
00693 <font class="keywordflow">if</font> (<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>>=otherCount)
00694 <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> -= otherCount;
00695 mainCopy.Vertices[i+k+1] = copy[o].Vertices[<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>];
00696 }
00697
00698 <font class="comment">// Copy the last one</font>
00699 mainCopy.Vertices[i+otherCount+1] = copy[o].Vertices[j];
00700 <font class="keywordflow">break</font>;
00701 }
00702 }
00703 }
00704 <font class="keywordflow">if</font> (j!=otherCount)
00705 <font class="keywordflow">break</font>;
00706 }
00707
00708 <font class="comment">// Not found ?</font>
00709 <font class="keywordflow">if</font> (i==thisCount)
00710 {
00711 <font class="comment">// Try to link in the sub polygons</font>
00712 uint otherToCheck;
00713 <font class="keywordflow">for</font> (otherToCheck=o+1; otherToCheck<other.size(); otherToCheck++)
00714 {
00715 uint otherToCheckCount = other[otherToCheck].Vertices.size();
00716 <font class="keywordflow">for</font> (i=0; i<otherToCheckCount; i++)
00717 {
00718 <font class="keywordflow">for</font> (j=0; j<otherCount; j++)
00719 {
00720 <font class="comment">// Test this segement</font>
00721 <font class="keywordflow">if</font> (!rootOther[otherToCheck].intersect (localVerticesOther[otherToCheck][i], localVerticesOther[o][j], i, 0xffffffff))
00722 {
00723 <font class="comment">// Test each other polygons</font>
00724 uint otherO;
00725 <font class="keywordflow">for</font> (otherO=0; otherO<other.size(); otherO++)
00726 {
00727 <font class="comment">// Intersect ?</font>
00728 <font class="keywordflow">if</font> (rootOther[otherO].intersect (localVerticesOther[otherToCheck][i], localVerticesOther[o][j], (otherToCheck == otherO)?i:0xffffffff, (otherO == o)?j:0xffffffff))
00729 <font class="keywordflow">break</font>;
00730 }
00731
00732 <font class="comment">// Continue ?</font>
00733 <font class="keywordflow">if</font> (otherO==other.size())
00734 {
00735 <font class="comment">// Insert new vertices</font>
00736 copy[otherToCheck].Vertices.insert (copy[otherToCheck].<a class="code" href="classNLMISC_1_1CPolygon.html#m0">Vertices</a>.begin()+i, 2+otherCount, CVector());
00737
00738 <font class="comment">// Copy the first vertex</font>
00739 copy[otherToCheck].Vertices[i] = copy[otherToCheck].Vertices[i+otherCount+2];
00740
00741 <font class="comment">// Copy the new vertices</font>
00742 uint k;
00743 <font class="keywordflow">for</font> (k=0; k<otherCount; k++)
00744 {
00745 uint <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> = j+k;
00746 <font class="keywordflow">if</font> (<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>>=otherCount)
00747 <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> -= otherCount;
00748 copy[otherToCheck].Vertices[i+k+1] = copy[otherO].Vertices[<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>];
00749 }
00750
00751 <font class="comment">// Copy the last one</font>
00752 copy[otherToCheck].Vertices[i+otherCount+1] = copy[otherO].Vertices[j];
00753 <font class="keywordflow">break</font>;
00754 }
00755 }
00756 }
00757 <font class="keywordflow">if</font> (j!=otherCount)
00758 <font class="keywordflow">break</font>;
00759 }
00760 <font class="keywordflow">if</font> (i!=otherToCheckCount)
00761 <font class="keywordflow">break</font>;
00762 }
00763 <font class="keywordflow">if</font> (otherToCheck==other.size())
00764 {
00765 <font class="comment">// Not ok</font>
00766 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00767 }
00768 }
00769 }
00770
00771 <font class="comment">// Ok</font>
00772 *<font class="keyword">this</font> = mainCopy;
00773 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00774 }
00775
00776 <font class="comment">// ***************************************************************************</font>
00777
00778
00779 <font class="comment">//====================================//</font>
00780 <font class="comment">// CPolygon2d implementation //</font>
00781 <font class="comment">//====================================//</font>
00782
00783
00784
<a name="l00785"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a1">00785</a> CPolygon2D::CPolygon2D(<font class="keyword">const</font> CPolygon &<a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>, <font class="keyword">const</font> CMatrix &projMat)
00786 {
00787 uint size = <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>.Vertices.size();
00788 <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.resize(size);
00789 <font class="keywordflow">for</font> (uint k = 0; k < size; ++k)
00790 {
00791 CVector proj = projMat * <a class="code" href="driver__opengl__extension__def_8h.html#a409">src</a>.Vertices[k];
00792 <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[k].set(proj.x, proj.y);
00793 }
00794 }
00795
00796 <font class="comment">// ***************************************************************************</font>
00797
<a name="l00798"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a3">00798</a> <font class="keywordtype">bool</font> CPolygon2D::isConvex()
00799 {
00800 <font class="keywordtype">bool</font> Front = <font class="keyword">true</font>, Back = <font class="keyword">false</font>;
00801 <font class="comment">// we apply a dummy algo for now : check wether every vertex is in the same side </font>
00802 <font class="comment">// of every plane defined by a segment of this poly</font>
00803 uint numVerts = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size();
00804 <font class="keywordflow">if</font> (numVerts < 3) <font class="keywordflow">return</font> <font class="keyword">true</font>;
00805 CVector segStart, segEnd;
00806 CPlane clipPlane;
00807 <font class="keywordflow">for</font> (TVec2fVect::const_iterator it = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.begin(); it != <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.end(); ++it)
00808 {
00809 segStart.set(it->x, it->y, 0); <font class="comment">// segment start</font>
00810 segEnd.set((it + 1)-><a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>, (it + 1)-><a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>, 0); <font class="comment">// segment end</font>
00811 <font class="keywordtype">float</font> n = (segStart - segEnd).norm(); <font class="comment">// segment norm</font>
00812 <font class="keywordflow">if</font> (n != 0)
00813 {
00814 clipPlane.make(segStart, segEnd, (n > 10 ? n : 10) * CVector::K + segStart); <font class="comment">// make a plane, with this segment and the poly normal</font>
00815 <font class="comment">// check each other vertices against this plane</font>
00816 <font class="keywordflow">for</font> (TVec2fVect::const_iterator it2 = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.begin(); it2 != <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.end(); ++it2)
00817 {
00818 <font class="keywordflow">if</font> (it2 != it && it2 != (it + 1)) <font class="comment">// the vertices must not be part of the test plane (because of imprecision)</font>
00819 {
00820
00821 <font class="keywordtype">float</font> dist = clipPlane * CVector(it2->x, it2-> <a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>, 0);
00822 <font class="keywordflow">if</font> (dist != 0) <font class="comment">// midlle pos</font>
00823 {
00824 <font class="keywordflow">if</font> (dist > 0) Front = <font class="keyword">true</font>; <font class="keywordflow">else</font> Back = <font class="keyword">true</font>;
00825 <font class="keywordflow">if</font> (Front && Back) <font class="keywordflow">return</font> <font class="keyword">false</font>; <font class="comment">// there are both front end back vertices -> failure</font>
00826 }
00827 }
00828 }
00829 }
00830 }
00831 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00832 }
00833
00834 <font class="comment">// ***************************************************************************</font>
00835
<a name="l00836"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a4">00836</a> <font class="keywordtype">void</font> CPolygon2D::buildConvexHull(CPolygon2D &dest)<font class="keyword"> const</font>
00837 <font class="keyword"></font>{
00838 <a class="code" href="debug_8h.html#a6">nlassert</a>(&dest != <font class="keyword">this</font>);
00839
00840 <font class="keywordflow">if</font> (this-><a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() == 3) <font class="comment">// with 3 points it is always convex</font>
00841 {
00842 dest = *<font class="keyword">this</font>;
00843 <font class="keywordflow">return</font>;
00844 }
00845 uint k, <a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>;
00846 uint numVerts = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size();
00847 CVector2f p, curr, prev;
00848 uint pIndex, p1Index, p2Index, pCurr, pPrev;
00849 <font class="comment">// this is not optimized, but not used in realtime.. =)</font>
00850 <a class="code" href="debug_8h.html#a6">nlassert</a>(numVerts >= 3);
00851 dest.Vertices.clear();
00852
00853 <font class="keyword">typedef</font> std::set<uint> TIndexSet;
00854 TIndexSet leftIndex;
00855 <font class="keywordflow">for</font> (k = 0; k < <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size(); ++k)
00856 {
00857 leftIndex.insert(k);
00858 }
00859
00860
00861 <font class="comment">// 1�) find the highest point p of the set. We are sure it belongs to the hull</font>
00862 pIndex = 0;
00863 p = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[0];
00864 <font class="keywordflow">for</font> (k = 1; k < numVerts; ++k)
00865 {
00866 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[k].y < p.y)
00867 {
00868 pIndex = k;
00869 p = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[k];
00870 }
00871 }
00872
00873 leftIndex.erase(pIndex);
00874
00875
00876 <font class="keywordtype">float</font> bestCP = 1.1f;
00877 p1Index = p2Index = pIndex;
00878
00879 <font class="keywordflow">for</font> (k = 0; k < numVerts; ++k)
00880 {
00881 <font class="keywordflow">if</font> (k != pIndex)
00882 {
00883 <font class="keywordflow">for</font> (<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> = 0; <a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> < numVerts; ++<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>)
00884 {
00885 <font class="keywordflow">if</font> (<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> != pIndex && <a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> != k)
00886 {
00887 CVector2f seg1 = (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>] - p).normed();
00888 CVector2f seg2 = (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[k] - p).normed();
00889
00890 <font class="comment">//CVector cp = CVector(seg1.x, seg1.y, 0) ^ CVector(seg2.x, seg2.y, 0);</font>
00891 <font class="comment">//float n = fabsf(cp.z);</font>
00892 <font class="keywordtype">float</font> n = seg1 * seg2;
00893 <font class="keywordflow">if</font> (n < bestCP)
00894 {
00895 p1Index = <a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>;
00896 p2Index = k;
00897 bestCP = n;
00898 }
00899 }
00900 }
00901 }
00902 }
00903
00904
00905 leftIndex.erase(p2Index);
00906
00907
00908
00909 <font class="comment">// start from the given triplet, and complete the poly until we reach the first point</font>
00910 pCurr = p2Index;
00911 pPrev = pIndex;
00912
00913 curr = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[pCurr];
00914 prev = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[pPrev];
00915
00916 <font class="comment">// create the first triplet vertices</font>
00917 dest.Vertices.push_back(<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[p1Index]);
00918 dest.Vertices.push_back(prev);
00919 dest.Vertices.push_back(curr);
00920
00921 uint step = 0;
00922
00923 <font class="keywordflow">for</font>(;;)
00924 {
00925 bestCP = 1.1f;
00926 CVector2f seg2 = (prev - curr).normed();
00927 TIndexSet::const_iterator bestIt = leftIndex.end();
00928 <font class="keywordflow">for</font> (TIndexSet::const_iterator it = leftIndex.begin(); it != leftIndex.end(); ++it)
00929 {
00930 <font class="keywordflow">if</font> (step == 0 && *it == p1Index) <font class="keywordflow">continue</font>;
00931 CVector2f seg1 = (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[*it] - curr).normed();
00932 <font class="keywordtype">float</font> n = seg1 * seg2;
00933 <font class="keywordflow">if</font> (n < bestCP)
00934 {
00935 bestCP = n;
00936 bestIt = it;
00937 }
00938 }
00939
00940 <a class="code" href="debug_8h.html#a6">nlassert</a>(bestIt != leftIndex.end());
00941 <font class="keywordflow">if</font> (*bestIt == p1Index)
00942 {
00943 <font class="keywordflow">return</font>; <font class="comment">// if we reach the start point we have finished</font>
00944 }
00945 prev = curr;
00946 curr = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[*bestIt];
00947 pPrev = pCurr;
00948 pCurr = *bestIt;
00949 <font class="comment">// add new point to the destination</font>
00950 dest.Vertices.push_back(curr);
00951 ++step;
00952 leftIndex.erase(bestIt);
00953 }
00954 }
00955
00956 <font class="comment">// ***************************************************************************</font>
00957
00958
<a name="l00959"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a6">00959</a> <font class="keywordtype">void</font> CPolygon2D::serial(<a class="code" href="classNLMISC_1_1IStream.html">NLMISC::IStream</a> &f) <font class="keywordflow">throw</font>(NLMISC::EStream)
00960 {
00961 (void)f.serialVersion(0);
00962 f.serialCont(Vertices);
00963 }
00964
00965 <font class="comment">// ***************************************************************************</font>
<a name="l00967"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a5">00967</a> <font class="comment">void CPolygon2D::getBestTriplet(uint &index0, uint &index1, uint &index2)</font>
00968 {
00969 <a class="code" href="debug_8h.html#a6">nlassert</a>(Vertices.size() >= 3);
00970 uint i, j, k;
00971 <font class="keywordtype">float</font> bestArea = 0.f;
00972 <font class="keyword">const</font> uint numVerts = Vertices.size();
00973 <font class="keywordflow">for</font> (i = 0; i < numVerts; ++i)
00974 {
00975 <font class="keywordflow">for</font> (j = 0; j < numVerts; ++j)
00976 {
00977 <font class="keywordflow">if</font> (i != j)
00978 {
00979 <font class="keywordflow">for</font> (k = 0; k < numVerts; ++k)
00980 {
00981 <font class="keywordflow">if</font> (k != i && k != j)
00982 {
00983 CVector2f v0 = Vertices[j] - Vertices[i];
00984 CVector2f v1 = Vertices[k] - Vertices[i];
00985 <font class="keywordtype">float</font> area = fabsf((CVector(v0.x, v0.y, 0) ^ CVector(v1.x, v1.y, 0)).norm());
00986 <font class="keywordflow">if</font> (area > bestArea)
00987 {
00988 bestArea = area;
00989 index0 = i;
00990 index1 = j;
00991 index2 = k;
00992 }
00993 }
00994 }
00995 }
00996 }
00997 }
00998 }
00999
01000
01002 <font class="comment">// scan a an edge of a poly and write it into a table</font>
01003 <font class="keyword">static</font> <font class="keywordtype">void</font> <a class="code" href="namespaceNLMISC.html#a309">ScanEdge</a>(CPolygon2D::TRasterVect &outputVect, sint topY, <font class="keyword">const</font> CVector2f &v1, <font class="keyword">const</font> CVector2f &v2, <font class="keywordtype">bool</font> rightEdge = <font class="keyword">true</font>)
01004 {
01005 <font class="keyword">const</font> uint rol16 = 65536;
01006 sint ceilY1 = (sint) ceilf(v1.y);
01007 sint <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>;
01008 <font class="keywordtype">float</font> deltaX, deltaY;
01009 <font class="keywordtype">float</font> fInverseSlope;
01010 sint iInverseSlope, iPosX;
01011
01012 <font class="comment">// check wether this segment gives a contribution to the final poly</font>
01013 <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a> = (sint) (ceilf(v2.y) - ceilY1);
01014 <font class="keywordflow">if</font> (<a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a> <= 0) <font class="keywordflow">return</font>;
01015
01016 <font class="comment">// compute slope</font>
01017 deltaY = v2.y - v1.y;
01018 deltaX = v2.x - v1.x;
01019 fInverseSlope = deltaX / deltaY;
01020
01021
01022 CPolygon2D::TRasterVect::iterator outputIt = outputVect.begin() + (ceilY1 - topY);
01023
01024 <font class="comment">// slope with ints</font>
01025 iInverseSlope = (sint) (rol16 * fInverseSlope);
01026
01027 <font class="comment">// sub-pixel accuracy</font>
01028 iPosX = (int) (rol16 * (v1.x + fInverseSlope * (ceilY1 - v1.y)));
01029
01030 <font class="keyword">const</font> CPolygon2D::TRasterVect::iterator endIt = outputIt + <a class="code" href="driver__opengl__extension__def_8h.html#a390">height</a>;
01031 <font class="keywordflow">if</font> (rightEdge)
01032 {
01033 <font class="keywordflow">do</font>
01034 {
01035 outputIt->second = iPosX >> 16;
01036 iPosX += iInverseSlope;
01037 ++outputIt;
01038 }
01039 <font class="keywordflow">while</font> (outputIt != endIt);
01040 }
01041 <font class="keywordflow">else</font>
01042 {
01043 iPosX += (rol16 - 1);
01044 <font class="keywordflow">do</font>
01045 {
01046 outputIt->first = iPosX >> 16;
01047 iPosX += iInverseSlope;
01048 ++outputIt;
01049 }
01050 <font class="keywordflow">while</font> (outputIt != endIt);
01051 }
01052 }
01053
01054
01055 <font class="comment">// *******************************************************************************</font>
01056 <font class="comment">// This function alow to cycle forward through a vertex vector like if it was a circular list</font>
01057 <font class="keyword">static</font> <font class="keyword">inline</font> CPolygon2D::TVec2fVect::const_iterator <a class="code" href="namespaceNLMISC.html#a310">Next</a>(<font class="keyword">const</font> CPolygon2D::TVec2fVect::const_iterator &it, <font class="keyword">const</font> CPolygon2D::TVec2fVect &cont)
01058 {
01059 <a class="code" href="debug_8h.html#a6">nlassert</a>(cont.size() != 0);
01060 <font class="keywordflow">if</font> ((it + 1) == cont.end()) <font class="keywordflow">return</font> cont.begin();
01061 <font class="keywordflow">return</font> (it + 1);
01062 }
01063
01064
01065 <font class="comment">// *******************************************************************************</font>
01066 <font class="comment">// This function alow to cycle backward through a (non null) vertex vector like if it was a circular list</font>
01067 <font class="keyword">static</font> <font class="keyword">inline</font> CPolygon2D::TVec2fVect::const_iterator <a class="code" href="namespaceNLMISC.html#a311">Prev</a>(<font class="keyword">const</font> CPolygon2D::TVec2fVect::const_iterator &it, <font class="keyword">const</font> CPolygon2D::TVec2fVect &cont)
01068 {
01069 <a class="code" href="debug_8h.html#a6">nlassert</a>(cont.size() != 0);
01070 <font class="keywordflow">if</font> (it == cont.begin()) <font class="keywordflow">return</font> cont.end() - 1;
01071 <font class="keywordflow">return</font> (it - 1);
01072 }
01073
01074 <font class="comment">// *******************************************************************************</font>
<a name="l01075"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a7">01075</a> <font class="keywordtype">void</font> CPolygon2D::computeBorders(TRasterVect &borders, sint &highestY)
01076 {
01077 <font class="comment">// an 'alias' to the vertices</font>
01078 <font class="keyword">const</font> <a class="code" href="classNLMISC_1_1CPolygon2D.html#s0">TVec2fVect</a> &V = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>;
01079 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() < 3)
01080 {
01081 borders.clear();
01082 <font class="keywordflow">return</font>;
01083 }
01084 <font class="keywordtype">bool</font> ccw; <font class="comment">// set to true when it has a counter clock wise orientation</font>
01085
01086 <font class="comment">// compute highest and lowest pos of the poly</font>
01087 <font class="keywordtype">float</font> fHighest = V[0].y;
01088 <font class="keywordtype">float</font> fLowest = fHighest;
01089
01090 <font class="comment">// iterators to the thighest and lowest vertex</font>
01091 TVec2fVect::const_iterator pLowest = V.begin(), pHighest = V.begin();
01092 TVec2fVect::const_iterator it = V.begin() ;
01093 <font class="keyword">const</font> TVec2fVect::const_iterator endIt = V.end();
01094 <font class="keywordflow">do</font>
01095 {
01096 <font class="keywordflow">if</font> (it->y > fLowest)
01097 {
01098 fLowest = it->y;
01099 pLowest = it;
01100 }
01101 <font class="keywordflow">else</font>
01102 <font class="keywordflow">if</font> (it->y < fHighest)
01103 {
01104 fHighest = it->y;
01105 pHighest = it;
01106 }
01107 ++it;
01108 }
01109 <font class="keywordflow">while</font> (it != endIt);
01110
01111
01112 sint iHighest = (sint) ceilf(fHighest) ;
01113 sint iLowest = (sint) ceilf(fLowest) ;
01114
01115 highestY = iHighest;
01116
01117
01119 uint polyHeight = iLowest - iHighest;
01120 <font class="keywordflow">if</font> (polyHeight <= 0)
01121 {
01122 borders.clear();
01123 <font class="keywordflow">return</font>;
01124 }
01125
01126 borders.resize(polyHeight);
01127
01128 <font class="comment">// iterator to the first vertex that has an y different from the top vertex</font>
01129 TVec2fVect::const_iterator pHighestRight = pHighest;
01130 <font class="comment">// we seek this vertex </font>
01131 <font class="keywordflow">while</font> (<a class="code" href="namespaceNLMISC.html#a310">Next</a>(pHighestRight, V)->y == fHighest)
01132 {
01133 pHighestRight = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(pHighestRight, V);
01134 }
01135
01136 <font class="comment">// iterator to the first vertex after pHighestRight, that has the same y than the highest vertex</font>
01137 TVec2fVect::const_iterator pHighestLeft = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(pHighestRight, V);
01138 <font class="comment">// seek the vertex</font>
01139 <font class="keywordflow">while</font> (pHighestLeft->y != fHighest)
01140 {
01141 pHighestLeft = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(pHighestLeft, V);
01142 }
01143
01144 TVec2fVect::const_iterator pPrevHighestLeft = <a class="code" href="namespaceNLMISC.html#a311">Prev</a>(pHighestLeft, V);
01145
01146 <font class="comment">// we need to get the orientation of the polygon</font>
01147 <font class="comment">// There are 2 case : flat, and non-flat top</font>
01148
01149 <font class="comment">// check for flat top</font>
01150 <font class="keywordflow">if</font> (pHighestLeft->x != pHighestRight->x)
01151 {
01152 <font class="comment">// compare right and left side</font>
01153 <font class="keywordflow">if</font> (pHighestLeft->x> pHighestRight->x)
01154 {
01155 ccw = <font class="keyword">true</font>; <font class="comment">// the list is CCW oriented</font>
01156 std::swap(pHighestLeft, pHighestRight);
01157 }
01158 <font class="keywordflow">else</font>
01159 {
01160 ccw = <font class="keyword">false</font>; <font class="comment">// the list is CW oriented </font>
01161 }
01162 }
01163 <font class="keywordflow">else</font>
01164 {
01165 <font class="comment">// The top of the poly is sharp</font>
01166 <font class="comment">// We perform a cross product of the 2 highest vect to get its orientation</font>
01167
01168 <font class="keyword">const</font> <font class="keywordtype">float</font> deltaXN = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(pHighestRight, V)->x - pHighestRight->x;
01169 <font class="keyword">const</font> <font class="keywordtype">float</font> deltaYN = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(pHighestRight, V)->y - pHighestRight->y;
01170 <font class="keyword">const</font> <font class="keywordtype">float</font> deltaXP = pPrevHighestLeft->x - pHighestLeft->x;
01171 <font class="keyword">const</font> <font class="keywordtype">float</font> deltaYP = pPrevHighestLeft->y - pHighestLeft->y;
01172 <font class="keywordflow">if</font> ((deltaXN * deltaYP - deltaYN * deltaXP) < 0)
01173 {
01174 ccw = <font class="keyword">true</font>; <font class="comment">// the list is CCW oriented</font>
01175 std::swap(pHighestLeft, pHighestRight);
01176 }
01177 <font class="keywordflow">else</font>
01178 {
01179 ccw = <font class="keyword">false</font>; <font class="comment">// the list is CW oriented</font>
01180 }
01181 }
01182
01183
01184 <font class="comment">// compute borders</font>
01185 TVec2fVect::const_iterator currV, nextV; <font class="comment">// current and next vertex</font>
01186 <font class="keywordflow">if</font> (!ccw) <font class="comment">// clock wise order ?</font>
01187 {
01188 currV = pHighestRight ;
01189 <font class="comment">// compute right edge from top to bottom</font>
01190 <font class="keywordflow">do</font>
01191 {
01192 nextV = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(currV, V);
01193 <a class="code" href="namespaceNLMISC.html#a309">ScanEdge</a>(borders, iHighest, *currV, *nextV, <font class="keyword">true</font>);
01194 currV = nextV;
01195 }
01196 <font class="keywordflow">while</font> (currV != pLowest); <font class="comment">// repeat until we reach the bottom vertex</font>
01197
01198 <font class="comment">// compute left edge from bottom to top</font>
01199 <font class="keywordflow">do</font>
01200 {
01201 nextV = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(currV, V);
01202 <a class="code" href="namespaceNLMISC.html#a309">ScanEdge</a>(borders, iHighest, *nextV, *currV, <font class="keyword">false</font>);
01203 currV = nextV;
01204 }
01205 <font class="keywordflow">while</font> (currV != pHighestLeft);
01206 }
01207 <font class="keywordflow">else</font> <font class="comment">// ccw order</font>
01208 {
01209 currV = pHighestLeft;
01210 <font class="comment">// compute left edge from top to bottom</font>
01211 <font class="keywordflow">do</font>
01212 {
01213 nextV = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(currV, V);
01214 <a class="code" href="namespaceNLMISC.html#a309">ScanEdge</a>(borders, iHighest, *currV, *nextV, <font class="keyword">false</font>) ;
01215 currV = nextV;
01216 }
01217 <font class="keywordflow">while</font> (currV != pLowest) ;
01218
01219 <font class="comment">// compute right edge from bottom to top</font>
01220 <font class="keywordflow">do</font>
01221 {
01222 nextV = <a class="code" href="namespaceNLMISC.html#a310">Next</a>(currV, V);
01223 <a class="code" href="namespaceNLMISC.html#a309">ScanEdge</a>(borders, iHighest, *nextV, *currV, <font class="keyword">true</font>);
01224 currV = nextV;
01225 }
01226 <font class="keywordflow">while</font> (currV != pHighestRight) ;
01227 }
01228 }
01229
01230 <font class="comment">// *******************************************************************************</font>
<a name="l01232"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#c0">01232</a> <font class="comment">float CPolygon2D::sumDPAgainstLine(float a, float b, float c) const</font>
01233 {
01234 <font class="keywordtype">float</font> sum = 0.f;
01235 <font class="keywordflow">for</font> (uint k = 0; k < Vertices.size(); ++k)
01236 {
01237 <font class="keyword">const</font> CVector2f &p = Vertices[k];
01238 sum += a * p.x + b * p.y + c;
01239 }
01240 <font class="keywordflow">return</font> sum;
01241 }
01242
01243
01244 <font class="comment">// ******************************************************************************* </font>
<a name="l01245"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a10">01245</a> <font class="keywordtype">bool</font> CPolygon2D::getNonNullSeg(uint &<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>)<font class="keyword"> const</font>
01246 <font class="keyword"></font>{
01247 <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() > 0);
01248 <font class="keywordtype">float</font> bestLength = 0.f;
01249 sint bestIndex = -1;
01250 <font class="keywordflow">for</font> (uint k = 0; k < <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() - 1; ++k)
01251 {
01252 <font class="keywordtype">float</font> norm2 = (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[k + 1] - <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[k]).sqrnorm();
01253 <font class="keywordflow">if</font> ( norm2 > bestLength)
01254 {
01255 bestLength = norm2;
01256 bestIndex = (int) k;
01257 }
01258 }
01259 <font class="keywordtype">float</font> norm2 = (<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() - 1] - <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[0]).sqrnorm();
01260 <font class="keywordflow">if</font> ( norm2 > bestLength)
01261 {
01262 <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> = <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() - 1;
01263 <font class="keywordflow">return</font> <font class="keyword">true</font>;
01264 }
01265
01266 <font class="keywordflow">if</font> (bestIndex != -1)
01267 {
01268 <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> = bestIndex;
01269 <font class="keywordflow">return</font> <font class="keyword">true</font>;
01270 }
01271 <font class="keywordflow">else</font>
01272 {
01273 <font class="keywordflow">return</font> <font class="keyword">false</font>;
01274 }
01275 }
01276
01277
01278 <font class="comment">// ******************************************************************************* </font>
<a name="l01279"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a11">01279</a> <font class="keywordtype">void</font> CPolygon2D::getLineEquation(uint <a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>, <font class="keywordtype">float</font> &a, <font class="keywordtype">float</font> &b, <font class="keywordtype">float</font> &c)<font class="keyword"> const</font>
01280 <font class="keyword"></font>{
01281 <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a> < <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size());
01282 <font class="keyword">const</font> CVector2f &v0 = <a class="code" href="classNLMISC_1_1CPolygon2D.html#c1">getSegRef0</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>);
01283 <font class="keyword">const</font> CVector2f &v1 = <a class="code" href="classNLMISC_1_1CPolygon2D.html#c2">getSegRef1</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a358">index</a>);
01284
01285 <a class="code" href="classNLMISC_1_1CVector2f.html">NLMISC::CVector2f</a> seg = v0 - v1;
01286 a = seg.<a class="code" href="classNLMISC_1_1CVector2f.html#m1">y</a>;
01287 b = - seg.<a class="code" href="classNLMISC_1_1CVector2f.html#m0">x</a>;
01288 c = - v0.x * a - v0.y * b;
01289 }
01290
01291 <font class="comment">// *******************************************************************************</font>
<a name="l01292"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a8">01292</a> <font class="keywordtype">bool</font> CPolygon2D::intersect(<font class="keyword">const</font> CPolygon2D &other)<font class="keyword"> const</font>
01293 <font class="keyword"></font>{
01294 <a class="code" href="debug_8h.html#a6">nlassert</a>(other.Vertices.size() > 0);
01295 uint nonNullSegIndex;
01297 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon2D.html#a10">getNonNullSeg</a>(nonNullSegIndex))
01298 {
01299 <font class="keywordtype">float</font> a0, b0, c0;
01300 <a class="code" href="classNLMISC_1_1CPolygon2D.html#a11">getLineEquation</a>(nonNullSegIndex, a0, b0, c0);
01301 <font class="keywordtype">float</font> orient = <a class="code" href="classNLMISC_1_1CPolygon2D.html#c0">sumDPAgainstLine</a>(a0, b0, c0);
01302
01303 <font class="keywordflow">for</font> (uint k = 0; k < <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size(); ++k)
01304 {
01306 <font class="keywordflow">if</font> ( (<a class="code" href="classNLMISC_1_1CPolygon2D.html#c1">getSegRef0</a>(k) - <a class="code" href="classNLMISC_1_1CPolygon2D.html#c2">getSegRef1</a>(k)).sqrnorm() == 0.f) <font class="keywordflow">continue</font>;
01307
01309 <font class="keywordtype">float</font> a, b, c;
01310 <a class="code" href="classNLMISC_1_1CPolygon2D.html#a11">getLineEquation</a>(k, a, b, c);
01311 uint <a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>;
01312 <font class="keywordflow">for</font> (<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> = 0; <a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> < other.Vertices.size(); ++<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>)
01313 {
01314 <font class="keyword">const</font> CVector2f &ov = other.Vertices[<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a>];
01315 <font class="keywordflow">if</font> ( orient * (ov.x * a + ov.y * b +c) > 0.f) <font class="keywordflow">break</font>;
01316 }
01317 <font class="keywordflow">if</font> (<a class="code" href="namespaceNLAISCRIPT.html#a20">l</a> == other.Vertices.size()) <font class="comment">// all point on the outside</font>
01318 {
01319 <font class="keywordflow">return</font> <font class="keyword">false</font>; <font class="comment">// outside</font>
01320 }
01321 }
01322 <font class="keywordflow">return</font> <font class="keyword">true</font>;
01323 }
01324 <font class="keywordflow">else</font> <font class="comment">// this poly is just a point</font>
01325 {
01326 <font class="keywordflow">return</font> other.contains(<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[0]);
01327 }
01328 }
01329
01330 <font class="comment">// *******************************************************************************</font>
<a name="l01331"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a9">01331</a> <font class="keywordtype">bool</font> CPolygon2D::contains(<font class="keyword">const</font> CVector2f &p)<font class="keyword"> const</font>
01332 <font class="keyword"></font>{
01333 <a class="code" href="debug_8h.html#a6">nlassert</a>(<a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size() > 0);
01334 uint nonNullSegIndex;
01336 <font class="keywordflow">if</font> (<a class="code" href="classNLMISC_1_1CPolygon2D.html#a10">getNonNullSeg</a>(nonNullSegIndex))
01337 {
01338 <font class="keywordtype">float</font> a0, b0, c0;
01339 <a class="code" href="classNLMISC_1_1CPolygon2D.html#a11">getLineEquation</a>(nonNullSegIndex, a0, b0, c0);
01340
01341 <font class="keywordflow">for</font> (uint k = 0; k < <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.size(); ++k)
01342 {
01344 <font class="keywordflow">if</font> ( (<a class="code" href="classNLMISC_1_1CPolygon2D.html#c1">getSegRef0</a>(k) - <a class="code" href="classNLMISC_1_1CPolygon2D.html#c2">getSegRef1</a>(k)).sqrnorm() == 0.f) <font class="keywordflow">continue</font>;
01345
01347 <font class="keywordtype">float</font> a, b, c;
01348 <a class="code" href="classNLMISC_1_1CPolygon2D.html#a11">getLineEquation</a>(k, a, b, c);
01349
01350 <font class="keywordflow">if</font> (a * p.x + b * p.y + c < 0) <font class="keywordflow">return</font> <font class="keyword">false</font>;
01351
01352 }
01353 <font class="keywordflow">return</font> <font class="keyword">true</font>;
01354 }
01355 <font class="keywordflow">else</font> <font class="comment">// this poly is just a point</font>
01356 {
01357 <font class="keywordflow">return</font> p == <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[0];
01358 }
01359 }
01360
01361
01362 <font class="comment">// *******************************************************************************</font>
<a name="l01363"></a><a class="code" href="classNLMISC_1_1CPolygon2D.html#a2">01363</a> CPolygon2D::CPolygon2D(<font class="keyword">const</font> CTriangle &tri, <font class="keyword">const</font> CMatrix &projMat)
01364 {
01365 <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>.resize(3);
01366 <a class="code" href="classNLMISC_1_1CVector.html">NLMISC::CVector</a> proj[3] = { projMat * tri.V0, projMat * tri.V1, projMat * tri.V2 };
01367 <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[0].set(proj[0].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>, proj[0].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
01368 <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[1].set(proj[1].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>, proj[1].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
01369 <a class="code" href="classNLMISC_1_1CPolygon2D.html#m0">Vertices</a>[2].set(proj[2].<a class="code" href="driver__opengl__extension__def_8h.html#a364">x</a>, proj[2].<a class="code" href="driver__opengl__extension__def_8h.html#a365">y</a>);
01370 }
01371
01372 } <font class="comment">// NLMISC</font>
</pre></div>
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