File content as of revision 0:3e9d11eb5a2e:

#include "mbed.h"
#include "TFT_4DGL.h"
unsigned short int  displayold[26][35];
unsigned short int  displaynew[26][35];
int sx,sy,clst,x,y,test,loops;
TFT_4DGL ecran(p9,p10,p11); // serial tx, serial rx, reset pin;

int main() {
    
    srand(1); // Random seed
    ecran.baudrate(115200);
    ecran.background_color(WHITE);
    ecran.pen_size(SOLID);
    // Set up Grid
    // Display field is 34 x 25
    y = 0;
    x = 0;
    for (sy = 1; sy <=34;sy++)
    {
    y=sy+1*sy*8; 
    ecran.line(9,y,233,y,BLUE);
    y=(sy+1*sy*8)+8;
    ecran.line(9,y,233,y,BLUE);
    }
    for (sx = 1; sx <=25;sx++)
    {
    x=sx+1*sx*8; 
    ecran.line(x,9,x,314,BLUE);
    x=(sx+1*sx*8)+8;
    ecran.line(x,9,x,314,BLUE);
    }    
        
    
    
    
    
    // forever run the next code to create a random field every 500 turns and play it out    
    while(1) 
    {
    // Set up a random field and display
    for (sy = 1; sy <= 34; sy++)
       {
            for (sx = 1; sx <= 25; sx++)
            {
                             
               if (rand()%10 == 4)
                {
                    displayold[sx][sy] = 1;
                    ecran.rectangle(((9*sx)+1),((9*sy)+1),((9*sx)+7),((9*sy)+7),RED);
                }
            }
       }
    
    // create new field from old field and run for 500 turns
    for (loops = 0;loops <= 500; loops++)
    {
     for (sy = 1; sy <= 34; sy++)
       {
            for (sx = 1; sx <= 25; sx++)
            {
                
                // Cheacking a block if its dead or alive then for neighbors and counting them and putting that in test
                if (displayold[sx][sy] == 1)
                {
                    test = displayold[sx-1][sy-1] + displayold[sx][sy-1] + displayold[sx+1][sy-1] + displayold[sx-1][sy] + displayold[sx+1][sy] + displayold[sx-1][sy+1] + displayold[sx][sy+1] + displayold[sx+1][sy+1]; 
                    if (test == 2 || test == 3)
                     {               
                        displaynew[sx][sy] = 1;
                     }
                     else displaynew[sx][sy] = 0;
                }
                else
                {
                    test = displayold[sx-1][sy-1] + displayold[sx][sy-1] + displayold[sx+1][sy-1] + displayold[sx-1][sy] + displayold[sx+1][sy] + displayold[sx-1][sy+1] + displayold[sx][sy+1] + displayold[sx+1][sy+1]; 
                    if (test == 3)
                     {               
                        displaynew[sx][sy] = 1;
                     }
                     
                }
            
            }
       }       
    // Now we have a new field created we can update the squares only if they are differnt and move the new array to the old one
    
    for (sy = 1; sy <= 34; sy++)
       {
            for (sx = 1; sx <= 25; sx++)
            {
               if (displaynew[sx][sy] != displayold[sx][sy])
               {
               displayold[sx][sy] = displaynew[sx][sy];
               if (displaynew[sx][sy] == 1) ecran.rectangle(((9*sx)+1),((9*sy)+1),((9*sx)+7),((9*sy)+7),RED);
               else ecran.rectangle(((9*sx)+1),((9*sy)+1),((9*sx)+7),((9*sy)+7),WHITE);     
               
               }
                             
               
            }
       }    
    
    
    }
    
    }
}