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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 &normal, <font class="keyword">const</font> CVector &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 &p0, <font class="keyword">const</font> CVector &p1, <font class="keyword">const</font> CVector &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 &p0, CVector &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<0 && d1<0)
00062 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00063 <font class="keywordflow">if</font>(d0>=0 && d1>=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>=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 &p0, CVector &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>=0 && d1>=0)
00082 <font class="keywordflow">return</font> <font class="keyword">true</font>;
00083 <font class="keywordflow">if</font>(d0<0 && d1<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<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<=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<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] < 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>] > 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>] < 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<=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<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] > 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>] < 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>] > 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
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