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// The Nature of Code// Daniel Shiffman// http://natureofcode.comclass GOL { constructor() { this.w = 8; this.columns = width / this.w; this.rows = height / this.w; // Game of life board this.board = new Array(this.columns); for (var i = 0; i < this.columns; i++) { this.board[i] = new Array(this.rows); } this.init(); } init() { for (let i = 0; i < this.columns; i++) { for (let j = 0; j < this.rows; j++) { this.board[i][j] = new Cell(i * this.w, j * this.w, this.w); } } } // The process of creating the new generation generate() { for (let i = 0; i < this.columns; i++) { for (let j = 0; j < this.rows; j++) { this.board[i][j].savePrevious(); } } // Loop through every spot in our 2D array and check spots neighbors for (let x = 0; x < this.columns; x++) { for (let y = 0; y < this.rows; y++) { // Add up all the states in a 3x3 surrounding grid let neighbors = 0; for (let i = -1; i <= 1; i++) { for (let j = -1; j <= 1; j++) { neighbors += this.board[(x + i + this.columns) % this.columns][(y + j + this.rows) % this.rows].previous; } } // A little trick to subtract the current cell's state since // we added it in the above loop neighbors -= this.board[x][y].previous; // Rules of Life if ((this.board[x][y].state == 1) && (neighbors < 2)) this.board[x][y].newState(0); else if ((this.board[x][y].state == 1) && (neighbors > 3)) this.board[x][y].newState(0); else if ((this.board[x][y].state === 0) && (neighbors == 3)) this.board[x][y].newState(1); // else do nothing! } } }; // This is the easy part, just draw the cells, fill 255 for '1', fill 0 for '0' display() { for (let i = 0; i < this.columns; i++) { for (let j = 0; j < this.rows; j++) { this.board[i][j].display(); } } }}