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<hr><h1>plane.cpp</h1><a href="plane_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="plane_8h.html">nel/misc/plane.h</a>"</font>
00029 
00030 
00031 <font class="keyword">namespace       </font>NLMISC
00032 {
00033 
00034 
00035 <font class="comment">//============================================================</font>
<a name="l00036"></a><a class="code" href="classNLMISC_1_1CPlane.html#z305_0">00036</a> <font class="keywordtype">void</font>    CPlane::make(<font class="keyword">const</font> CVector &amp;normal, <font class="keyword">const</font> CVector &amp;p)
00037 {
00038         CVector <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>= normal.normed();
00039         <a class="code" href="classNLMISC_1_1CPlane.html#m0">a</a>= <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>.x;
00040         <a class="code" href="classNLMISC_1_1CPlane.html#m1">b</a>= <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>.y;
00041         <a class="code" href="classNLMISC_1_1CPlane.html#m2">c</a>= <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>.z;
00042         <a class="code" href="classNLMISC_1_1CPlane.html#m3">d</a>=-(<a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>*p);               <font class="comment">// d=- (ax+by+cz).</font>
00043 }
<a name="l00044"></a><a class="code" href="classNLMISC_1_1CPlane.html#z305_1">00044</a> <font class="keywordtype">void</font>    CPlane::make(<font class="keyword">const</font> CVector &amp;p0, <font class="keyword">const</font> CVector &amp;p1, <font class="keyword">const</font> CVector &amp;p2)
00045 {
00046         CVector <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>;
00047 
00048         <a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>=(p1-p0)^(p2-p1);
00049         <a class="code" href="classNLMISC_1_1CPlane.html#z305_0">make</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a368">v</a>,p1);
00050 }
00051 
00052 
00053 <font class="comment">//============================================================</font>
<a name="l00054"></a><a class="code" href="classNLMISC_1_1CPlane.html#z306_4">00054</a> <font class="keywordtype">bool</font>    CPlane::clipSegmentBack(CVector &amp;p0, CVector &amp;p1)<font class="keyword"> const</font>
00055 <font class="keyword"></font>{
00056         <font class="keywordtype">float</font>   d0,d1,decal;
00057         CVector proj;
00058 
00059         d0= (*this)*p0;
00060         d1= (*this)*p1;
00061         <font class="keywordflow">if</font>(d0&lt;0 &amp;&amp; d1&lt;0)
00062                 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00063         <font class="keywordflow">if</font>(d0&gt;=0 &amp;&amp; d1&gt;=0)
00064                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00065         <font class="comment">// Clip line.</font>
00066         decal= (0-d0) / (d1-d0);
00067         proj= p0+ (p1-p0)*decal;
00068         <font class="keywordflow">if</font>(d0&gt;=0)
00069                 p0=proj;
00070         <font class="keywordflow">else</font>
00071                 p1=proj;
00072         <font class="keywordflow">return</font> <font class="keyword">true</font>;
00073 }
<a name="l00074"></a><a class="code" href="classNLMISC_1_1CPlane.html#z306_5">00074</a> <font class="keywordtype">bool</font>    CPlane::clipSegmentFront(CVector &amp;p0, CVector &amp;p1)<font class="keyword"> const</font>
00075 <font class="keyword"></font>{
00076         <font class="keywordtype">float</font>   d0,d1,decal;
00077         CVector proj;
00078 
00079         d0= (*this)*p0;
00080         d1= (*this)*p1;
00081         <font class="keywordflow">if</font>(d0&gt;=0 &amp;&amp; d1&gt;=0)
00082                 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00083         <font class="keywordflow">if</font>(d0&lt;0 &amp;&amp; d1&lt;0)
00084                 <font class="keywordflow">return</font> <font class="keyword">false</font>;
00085         <font class="comment">// Clip line.</font>
00086         decal= (0-d0) / (d1-d0);
00087         proj= p0+ (p1-p0)*decal;
00088         <font class="keywordflow">if</font>(d0&lt;0)
00089                 p0=proj;
00090         <font class="keywordflow">else</font>
00091                 p1=proj;
00092         <font class="keywordflow">return</font> <font class="keyword">true</font>;
00093 }
00094 
00095 
00096 <font class="comment">//============================================================</font>
<a name="l00097"></a><a class="code" href="classNLMISC_1_1CPlane.html#z306_6">00097</a> sint    CPlane::clipPolygonBack(CVector <a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[], CVector out[], sint nIn)<font class="keyword"> const</font>
00098 <font class="keyword"></font>{
00099         sint nOut=0,<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>,p,i;
00100         <font class="keywordflow">if</font>(nIn&lt;=2) <font class="keywordflow">return</font> 0;
00101 
00102         <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>=nIn-1;
00103 
00104         <font class="keywordflow">for</font> (i=0;i&lt;nIn;i++)
00105         {
00106                 p=i;
00107                 <font class="keywordflow">if</font> ( (*this)*<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p] &lt; 0 )
00108                 {
00109                         <font class="keywordflow">if</font> ( (*this)*<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>] &gt; 0 ) 
00110                                 out[nOut++]= <a class="code" href="classNLMISC_1_1CPlane.html#z306_2">intersect</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>],<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p]);
00111                         out[nOut++]=<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p];
00112                 }
00113                 <font class="keywordflow">else</font>
00114                 {
00115                         <font class="keywordflow">if</font> ( (*this)*<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>] &lt; 0 ) 
00116                                 out[nOut++]= <a class="code" href="classNLMISC_1_1CPlane.html#z306_2">intersect</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>],<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p]);
00117                 }
00118                 <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>=p;
00119         }
00120 
00121         <font class="keywordflow">return</font> nOut;
00122 }
00123 
00124 <font class="comment">//============================================================</font>
<a name="l00125"></a><a class="code" href="classNLMISC_1_1CPlane.html#z306_7">00125</a> sint    CPlane::clipPolygonFront(CVector <a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[], CVector out[], sint nIn)<font class="keyword"> const</font>
00126 <font class="keyword"></font>{
00127         sint nOut=0,<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>,p,i;
00128         <font class="keywordflow">if</font>(nIn&lt;=2) <font class="keywordflow">return</font> 0;
00129 
00130         <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>=nIn-1;
00131 
00132         <font class="keywordflow">for</font> (i=0;i&lt;nIn;i++)
00133         {
00134                 p=i;
00135                 <font class="keywordflow">if</font> ( (*this)*<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p] &gt; 0 )
00136                 {
00137                         <font class="keywordflow">if</font> ( (*this)*<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>] &lt; 0 ) 
00138                                 out[nOut++]= <a class="code" href="classNLMISC_1_1CPlane.html#z306_2">intersect</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>],<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p]);
00139                         out[nOut++]=<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p];
00140                 }
00141                 <font class="keywordflow">else</font>
00142                 {
00143                         <font class="keywordflow">if</font> ( (*this)*<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>] &gt; 0 ) 
00144                                 out[nOut++]= <a class="code" href="classNLMISC_1_1CPlane.html#z306_2">intersect</a>(<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[<a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>],<a class="code" href="driver__opengl__extension__def_8h.html#a404">in</a>[p]);
00145                 }
00146                 <a class="code" href="driver__opengl__extension__def_8h.html#a383">s</a>=p;
00147         }
00148 
00149         <font class="keywordflow">return</font> nOut;
00150 }
00151 
00152 
00153 <font class="comment">//============================================================</font>
<a name="l00154"></a><a class="code" href="classNLMISC_1_1CPlane.html#z307_0">00154</a> CPlane  CPlane::inverted()<font class="keyword"> const</font>
00155 <font class="keyword"></font>{
00156         <font class="keywordflow">return</font> <a class="code" href="classNLMISC_1_1CPlane.html#z304_0">CPlane</a>(-<a class="code" href="classNLMISC_1_1CPlane.html#m0">a</a>, -<a class="code" href="classNLMISC_1_1CPlane.html#m1">b</a>, -<a class="code" href="classNLMISC_1_1CPlane.html#m2">c</a>, -<a class="code" href="classNLMISC_1_1CPlane.html#m3">d</a>);
00157 }
00158                 
00159 <font class="comment">//============================================================</font>
<a name="l00160"></a><a class="code" href="classNLMISC_1_1CPlane.html#z307_1">00160</a> <font class="keywordtype">void</font>    CPlane::invert()
00161 {
00162         <a class="code" href="classNLMISC_1_1CPlane.html#m0">a</a> = -<a class="code" href="classNLMISC_1_1CPlane.html#m0">a</a>;
00163         <a class="code" href="classNLMISC_1_1CPlane.html#m1">b</a> = -<a class="code" href="classNLMISC_1_1CPlane.html#m1">b</a>;
00164         <a class="code" href="classNLMISC_1_1CPlane.html#m2">c</a> = -<a class="code" href="classNLMISC_1_1CPlane.html#m2">c</a>;
00165         <a class="code" href="classNLMISC_1_1CPlane.html#m3">d</a> = -<a class="code" href="classNLMISC_1_1CPlane.html#m3">d</a>;
00166 }
00167 
00168 
00169 
00170 
00171 }
00172 
</pre></div>

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