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<h1>dox/Rendering/vtkgluPickMatrix.h</h1><a href="a03410.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*=========================================================================</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment"> Program: Visualization Toolkit</span>
<a name="l00004"></a>00004 <span class="comment"> Module: $RCSfile: vtkgluPickMatrix.h,v $</span>
<a name="l00005"></a>00005 <span class="comment"></span>
<a name="l00006"></a>00006 <span class="comment"> Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen</span>
<a name="l00007"></a>00007 <span class="comment"> All rights reserved.</span>
<a name="l00008"></a>00008 <span class="comment"> See Copyright.txt or http://www.kitware.com/Copyright.htm for details.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment"> This software is distributed WITHOUT ANY WARRANTY; without even</span>
<a name="l00011"></a>00011 <span class="comment"> the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR</span>
<a name="l00012"></a>00012 <span class="comment"> PURPOSE. See the above copyright notice for more information.</span>
<a name="l00013"></a>00013 <span class="comment"></span>
<a name="l00014"></a>00014 <span class="comment">=========================================================================*/</span>
<a name="l00022"></a>00022 <span class="preprocessor">#ifndef vtkgluPickMatrix_h</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">#define vtkgluPickMatrix_h</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span>
<a name="l00025"></a>00025 <span class="preprocessor">#ifndef VTK_IMPLEMENT_MESA_CXX</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor"># include "vtkOpenGL.h"</span> <span class="comment">// Needed for GLfloat and GLdouble.</span>
<a name="l00027"></a>00027 <span class="preprocessor">#endif</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="comment">// This function was copied from Mesa and sets up the pick matrix</span>
<a name="l00030"></a><a class="code" href="a03410.html#f988d7744696c3b8f776fa7556c79985">00030</a> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="a03410.html#f988d7744696c3b8f776fa7556c79985">vtkgluPickMatrix</a>( GLdouble x, GLdouble y,
<a name="l00031"></a>00031 GLdouble width, GLdouble <a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210c076ccbe549041286aaf7bc34202ebdf">height</a>,
<a name="l00032"></a>00032 <span class="keywordtype">int</span> *origin, <span class="keywordtype">int</span> *<a class="code" href="a03761.html#c6551f7bf833e8254b2b3ecdaea0d210e3d5e7c015dff08d8daf72a0102e1444">size</a> )
<a name="l00033"></a>00033 {
<a name="l00034"></a>00034 GLfloat m[16];
<a name="l00035"></a>00035 GLfloat sx, sy;
<a name="l00036"></a>00036 GLfloat tx, ty;
<a name="l00037"></a>00037
<a name="l00038"></a>00038 sx = size[0] / width;
<a name="l00039"></a>00039 sy = size[1] / height;
<a name="l00040"></a>00040 tx = (size[0] + 2.0 * (origin[0] - x)) / width;
<a name="l00041"></a>00041 ty = (size[1] + 2.0 * (origin[1] - y)) / height;
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="preprocessor">#define M(row,col) m[col*4+row]</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span> <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(0,0) = sx; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(0,1) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(0,2) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(0,3) = tx;
<a name="l00045"></a>00045 <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(1,0) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(1,1) = sy; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(1,2) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(1,3) = ty;
<a name="l00046"></a>00046 <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(2,0) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(2,1) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(2,2) = 1.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(2,3) = 0.0;
<a name="l00047"></a>00047 <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(3,0) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(3,1) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(3,2) = 0.0; <a class="code" href="a03410.html#d1fefc30502b40fc6aebcb46d0a3b262">M</a>(3,3) = 1.0;
<a name="l00048"></a>00048 <span class="preprocessor">#undef M</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span>
<a name="l00050"></a>00050 glMultMatrixf( m );
<a name="l00051"></a>00051 }
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="preprocessor">#endif</span>
</pre></div></div>
<hr size="1"><address style="text-align: right;"><small>Generated on Wed Jun 3 18:35:46 2009 for VTK by
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