Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_c_life_engine_8cpp_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/Graphics/WS/Direct/CLifeEngine.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="preprocessor">#include <e32math.h></span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="preprocessor">#include "CLifeEngine.h"</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 CLifeEngine::CLifeEngine(<span class="keyword">const</span> TInt64& aSeed)
<a name="l00021"></a>00021 : iSeed(aSeed)
<a name="l00022"></a>00022 {
<a name="l00023"></a>00023 Reset();
<a name="l00024"></a>00024 }
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="comment">// Sets random initial cell states</span>
<a name="l00027"></a>00027 <span class="keywordtype">void</span> CLifeEngine::Reset()
<a name="l00028"></a>00028 {
<a name="l00029"></a>00029 <span class="keywordflow">for</span> (TInt y=0; y < DIM_Y_ARRAY; y++)
<a name="l00030"></a>00030 <span class="keywordflow">for</span> (TInt x=0; x < DIM_X_ARRAY; x++)
<a name="l00031"></a>00031 iCellArray[x][y] = (Math::Rand(iSeed) > KMaxTInt/2) ? (TBool)ETrue : (TBool)EFalse;
<a name="l00032"></a>00032 }
<a name="l00033"></a>00033
<a name="l00034"></a>00034 <span class="comment">// Loops through cell array, storing a version altered according to the </span>
<a name="l00035"></a>00035 <span class="comment">// game of life, in a temporary array</span>
<a name="l00036"></a>00036 <span class="keywordtype">void</span> CLifeEngine::AddGeneration()
<a name="l00037"></a>00037 {
<a name="l00038"></a>00038 TInt numNeighbours;
<a name="l00039"></a>00039
<a name="l00040"></a>00040 <span class="keywordflow">for</span> (TInt y=0; y < DIM_Y_ARRAY; y++)
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042 <span class="keywordflow">for</span> (TInt x=0; x < DIM_X_ARRAY; x++)
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 numNeighbours=NumNeighbors(x,y);
<a name="l00045"></a>00045
<a name="l00046"></a>00046 <span class="keywordflow">if</span> (iCellArray[x][y])
<a name="l00047"></a>00047 <span class="comment">// Filled cell</span>
<a name="l00048"></a>00048 {
<a name="l00049"></a>00049 <span class="keywordflow">if</span> ((numNeighbours == 2) || (numNeighbours == 3))
<a name="l00050"></a>00050 iTempCellArray[x][y]=ETrue;
<a name="l00051"></a>00051 <span class="keywordflow">else</span>
<a name="l00052"></a>00052 iTempCellArray[x][y]=EFalse;
<a name="l00053"></a>00053 }
<a name="l00054"></a>00054 <span class="keywordflow">else</span>
<a name="l00055"></a>00055 <span class="comment">// Empty cell</span>
<a name="l00056"></a>00056 {
<a name="l00057"></a>00057 <span class="keywordflow">if</span> (numNeighbours == 3)
<a name="l00058"></a>00058 iTempCellArray[x][y]=ETrue;
<a name="l00059"></a>00059 <span class="keywordflow">else</span>
<a name="l00060"></a>00060 iTempCellArray[x][y]=EFalse;
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062 }
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keywordflow">for</span> (TInt y2 =0; y2 < DIM_Y_ARRAY; y2++)
<a name="l00066"></a>00066 <span class="keywordflow">for</span> (TInt x2=0; x2 < DIM_X_ARRAY; x2++)
<a name="l00067"></a>00067 iCellArray[x2][y2]=iTempCellArray[x2][y2];
<a name="l00068"></a>00068 }
<a name="l00069"></a>00069
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="comment">// Gets the number of adjacent cells to the specified cell</span>
<a name="l00072"></a>00072 TInt CLifeEngine::NumNeighbors(TInt x, TInt y)
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 TInt numNeighbors=0;
<a name="l00075"></a>00075 TInt i =0;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="comment">// Get neighbors to the left</span>
<a name="l00078"></a>00078 <span class="keywordflow">if</span> ((x-1) >= 0)
<a name="l00079"></a>00079 <span class="keywordflow">for</span> (i=y-1; i <= y+1; i++)
<a name="l00080"></a>00080 <span class="keywordflow">if</span> ((i >= 0) && (i < DIM_Y_ARRAY))
<a name="l00081"></a>00081 <span class="keywordflow">if</span> (iCellArray[x-1][i])
<a name="l00082"></a>00082 numNeighbors++;
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">// Get neighbors to the right</span>
<a name="l00085"></a>00085 <span class="keywordflow">if</span> (x+1 < DIM_X_ARRAY)
<a name="l00086"></a>00086 <span class="keywordflow">for</span> (i=y-1; i <= y+1; i++)
<a name="l00087"></a>00087 <span class="keywordflow">if</span> ((i >= 0) && (i < DIM_Y_ARRAY))
<a name="l00088"></a>00088 <span class="keywordflow">if</span> (iCellArray[x+1][i])
<a name="l00089"></a>00089 numNeighbors++;
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="comment">// Get neighbors straight above</span>
<a name="l00092"></a>00092 <span class="keywordflow">if</span> ((y-1) >= 0)
<a name="l00093"></a>00093 <span class="keywordflow">if</span> (iCellArray[x][y-1])
<a name="l00094"></a>00094 numNeighbors++;
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">// Get neighbors straight below</span>
<a name="l00097"></a>00097 <span class="keywordflow">if</span> ((y+1) < DIM_Y_ARRAY)
<a name="l00098"></a>00098 <span class="keywordflow">if</span> (iCellArray[x][y+1])
<a name="l00099"></a>00099 numNeighbors++;
<a name="l00100"></a>00100
<a name="l00101"></a>00101 <span class="keywordflow">return</span> numNeighbors;
<a name="l00102"></a>00102 }
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