examples/Graphics/WS/Direct/CLifeEngine.cpp

/*
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  may be used to endorse or promote products derived from this software
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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Description:  
*/


#include <e32math.h>

#include "CLifeEngine.h"

CLifeEngine::CLifeEngine(const TInt64& aSeed)
: iSeed(aSeed)
        {
        Reset();
        }

// Sets random initial cell states
void CLifeEngine::Reset()
        {
        for (TInt y=0; y < DIM_Y_ARRAY; y++)
                for (TInt x=0; x < DIM_X_ARRAY; x++)
                        iCellArray[x][y] = (Math::Rand(iSeed) > KMaxTInt/2) ? (TBool)ETrue : (TBool)EFalse;
        }

// Loops through cell array, storing a version altered according to the 
// game of life, in a temporary array
void CLifeEngine::AddGeneration()
        {
        TInt numNeighbours;
        
        for (TInt y=0; y < DIM_Y_ARRAY; y++)
                {
                for (TInt x=0; x < DIM_X_ARRAY; x++)
                        {
                        numNeighbours=NumNeighbors(x,y);
                        
                        if (iCellArray[x][y])
                                // Filled cell
                                {
                                if ((numNeighbours == 2) || (numNeighbours == 3))
                                        iTempCellArray[x][y]=ETrue;
                                else
                                        iTempCellArray[x][y]=EFalse;
                                }
                        else
                                // Empty cell
                                {
                                if (numNeighbours == 3)
                                        iTempCellArray[x][y]=ETrue;
                                else
                                        iTempCellArray[x][y]=EFalse;
                                }
                        }
                }
        
        for (TInt y2 =0; y2 < DIM_Y_ARRAY; y2++)
                for (TInt x2=0; x2 < DIM_X_ARRAY; x2++)
                        iCellArray[x2][y2]=iTempCellArray[x2][y2];
        }


// Gets the number of adjacent cells to the specified cell
TInt CLifeEngine::NumNeighbors(TInt x, TInt y)
        {
        TInt numNeighbors=0;
        TInt i =0;

        // Get neighbors to the left
        if ((x-1) >= 0)
                for (i=y-1; i <= y+1; i++)
                        if ((i >= 0) && (i < DIM_Y_ARRAY))
                                if (iCellArray[x-1][i])
                                        numNeighbors++;
        
        // Get neighbors to the right
        if (x+1 < DIM_X_ARRAY)
                for (i=y-1; i <= y+1; i++)
                        if ((i >= 0) && (i < DIM_Y_ARRAY))
                                if (iCellArray[x+1][i])
                                        numNeighbors++;
        
        // Get neighbors straight above
        if ((y-1) >= 0)
                if (iCellArray[x][y-1])
                        numNeighbors++;
        
        // Get neighbors straight below
        if ((y+1) < DIM_Y_ARRAY)
                if (iCellArray[x][y+1])
                        numNeighbors++;
        
        return numNeighbors;
        }

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