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examples/Graphics/WS/Direct/CLifeEngine.cpp

00001 // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).
00002 // All rights reserved.
00003 // This component and the accompanying materials are made available
00004 // under the terms of "Eclipse Public License v1.0"
00005 // which accompanies this distribution, and is available
00006 // at the URL "http://www.eclipse.org/legal/epl-v10.html".
00007 //
00008 // Initial Contributors:
00009 // Nokia Corporation - initial contribution.
00010 //
00011 // Contributors:
00012 //
00013 // Description:
00014 //
00015 
00016 #include <e32math.h>
00017 
00018 #include "CLifeEngine.h"
00019 
00020 CLifeEngine::CLifeEngine(const TInt64& aSeed)
00021 : iSeed(aSeed)
00022         {
00023         Reset();
00024         }
00025 
00026 // Sets random initial cell states
00027 void CLifeEngine::Reset()
00028         {
00029         for (TInt y=0; y < DIM_Y_ARRAY; y++)
00030                 for (TInt x=0; x < DIM_X_ARRAY; x++)
00031                         iCellArray[x][y] = (Math::Rand(iSeed) > KMaxTInt/2) ? (TBool)ETrue : (TBool)EFalse;
00032         }
00033 
00034 // Loops through cell array, storing a version altered according to the 
00035 // game of life, in a temporary array
00036 void CLifeEngine::AddGeneration()
00037         {
00038         TInt numNeighbours;
00039         
00040         for (TInt y=0; y < DIM_Y_ARRAY; y++)
00041                 {
00042                 for (TInt x=0; x < DIM_X_ARRAY; x++)
00043                         {
00044                         numNeighbours=NumNeighbors(x,y);
00045                         
00046                         if (iCellArray[x][y])
00047                                 // Filled cell
00048                                 {
00049                                 if ((numNeighbours == 2) || (numNeighbours == 3))
00050                                         iTempCellArray[x][y]=ETrue;
00051                                 else
00052                                         iTempCellArray[x][y]=EFalse;
00053                                 }
00054                         else
00055                                 // Empty cell
00056                                 {
00057                                 if (numNeighbours == 3)
00058                                         iTempCellArray[x][y]=ETrue;
00059                                 else
00060                                         iTempCellArray[x][y]=EFalse;
00061                                 }
00062                         }
00063                 }
00064         
00065         for (TInt y2 =0; y2 < DIM_Y_ARRAY; y2++)
00066                 for (TInt x2=0; x2 < DIM_X_ARRAY; x2++)
00067                         iCellArray[x2][y2]=iTempCellArray[x2][y2];
00068         }
00069 
00070 
00071 // Gets the number of adjacent cells to the specified cell
00072 TInt CLifeEngine::NumNeighbors(TInt x, TInt y)
00073         {
00074         TInt numNeighbors=0;
00075         TInt i =0;
00076 
00077         // Get neighbors to the left
00078         if ((x-1) >= 0)
00079                 for (i=y-1; i <= y+1; i++)
00080                         if ((i >= 0) && (i < DIM_Y_ARRAY))
00081                                 if (iCellArray[x-1][i])
00082                                         numNeighbors++;
00083         
00084         // Get neighbors to the right
00085         if (x+1 < DIM_X_ARRAY)
00086                 for (i=y-1; i <= y+1; i++)
00087                         if ((i >= 0) && (i < DIM_Y_ARRAY))
00088                                 if (iCellArray[x+1][i])
00089                                         numNeighbors++;
00090         
00091         // Get neighbors straight above
00092         if ((y-1) >= 0)
00093                 if (iCellArray[x][y-1])
00094                         numNeighbors++;
00095         
00096         // Get neighbors straight below
00097         if ((y+1) < DIM_Y_ARRAY)
00098                 if (iCellArray[x][y+1])
00099                         numNeighbors++;
00100         
00101         return numNeighbors;
00102         }
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