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  1. boolean thisGen[][] = new boolean[100][100];
  2. boolean nextGen[][] = new boolean[100][100];
  3.  
  4. void setup() {
  5.   size(800, 800);
  6.   strokeWeight(1);
  7.   frameRate(100);
  8.   for (int i = 0; i < thisGen.length; i++) {
  9.     for (int j = 0; j < thisGen.length; j++) {
  10.       nextGen[i][j] = false;
  11.       int rand = int(random(5));
  12.       if (rand == 0) {
  13.         thisGen[i][j] = true;
  14.       }
  15.     }
  16.   }
  17.   //glider
  18.   //thisGen[5][5] = true;
  19.   //thisGen[6][5] = true;
  20.   //thisGen[6][3] = true;
  21.   //thisGen[7][4] = true;
  22.   //thisGen[7][5] = true;
  23. }
  24.  
  25. void draw() {
  26.   for (int i = 0; i < thisGen.length; i++) {
  27.     for (int j = 0; j < thisGen.length; j++) {
  28.       if (thisGen[i][j]) {
  29.         fill(0);
  30.       } else fill(255);
  31.       rect(i*8, j*8, 8, 8);
  32.     }
  33.   }
  34.   for (int i = 1; i < thisGen.length - 1; i++) {
  35.     for (int j = 1; j < thisGen.length - 1; j++) {
  36.  
  37.       int count = 0;
  38.       if (thisGen[i-1][j-1]) count++;  // top left
  39.       if (thisGen[i][j-1]) count++; //top middle
  40.       if (thisGen[i+1][j-1]) count++; // top right
  41.       if (thisGen[i+1][j]) count++; // middle right
  42.       if (thisGen[i+1][j+1]) count++; //bottom right
  43.       if (thisGen[i][j+1]) count++; //bottom middle
  44.       if (thisGen[i-1][j+1]) count++; //bottom left
  45.       if (thisGen[i-1][j]) count++; // left middle
  46.  
  47.       if (thisGen[i][j] && count < 2) nextGen[i][j] = false;
  48.       if (thisGen[i][j] && count > 3) nextGen[i][j] = false;
  49.       if (thisGen[i][j] && count == 2) nextGen[i][j] = true;
  50.       if (thisGen[i][j] && count == 3) nextGen[i][j] = true;
  51.       if (!thisGen[i][j] && count == 3) nextGen[i][j] = true;
  52.     }
  53.   }
  54.  
  55.   for (int i = 0; i < thisGen.length; i++) {
  56.     for (int j = 0; j < thisGen.length; j++) {
  57.       thisGen[i][j] = nextGen[i][j];
  58.     }
  59.   }
  60. }
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