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// Conway's Game of Life - Teaching 2D Arrays // // processing version // see: http://www.16kb.com/portfolio/display/automata/ import controlP5.*; ControlP5 controlP5; int playerScale = 10; // factor to magnify grid int cols = 80; // number of cols in world int rows = 55; // number of rows int[][] world = new int[cols][rows]; // initialize 2D array that will house the game int aliveFill = 128; int backgroundFill = 0; int systemReset = 0; Knob speedKnob; void setup() { size(800,600); smooth(); frameRate(10); background(0); translate(5,5); // shifts everything to the right and down controlP5 = new ControlP5(this); controlP5.addButton("reset",10,-5,560,80,20).setId(1); speedKnob = controlP5.addKnob("speed",1,30,10,100,560,20); randomizeBoard(); } void draw () { translate(5,5); if (systemReset == 1) { systemReset = 0; randomizeBoard(); } // check each cell int num; for (int x=0; x < cols; x++) { // loop through every column for (int y=0; y < rows; y++) { // loop through every row num = checkNeighbours(x,y); if (world[x][y] == 0 && num == 3) { // bring cell to life world[x][y] = 8; // 0 = dead, 8 dead, but alive next drawCell(x, y, 1); } if ( world[x][y] == 1 && (num < 2 || num > 3) ) { // kill cell world[x][y] = -1; // 1 = alive, -1 = alive, but dead next round drawCell(x, y, 0); } } } // set all changing state codes (ie. -1 and 8) for (int x=0; x < cols; x++) { // loop through every column for (int y=0; y < rows; y++) { // loop through every row if (world[x][y] == 8) world[x][y] = 1; if (world[x][y] == -1) world[x][y] = 0; } } } // end of draw void reset(float theValue) { println("a button event. "+theValue); systemReset =1; } // draw a cell void drawCell(int x, int y, int alive) { if (alive == 1) { fill(aliveFill); ellipse(x*playerScale, y*playerScale, 8, 8); } else { fill(backgroundFill); noSmooth(); ellipse(x*playerScale, y*playerScale, 8, 8); smooth(); } } // check how neighbours a position has int checkNeighbours(int x, int y) { int neighbours = 0; for (int dx=-1; dx<=1; dx++) { for (int dy=-1; dy<=1; dy++) { if (dy==0 && dx==0) // skip checking ourselves continue; if ((x+dx >= 0 && x+dx < cols) && (y+dy >= 0 && y+dy < rows) && (world[x+dx][y+dy] == 1 || world[x+dx][y+dy] == -1) ) { neighbours++; } } } return neighbours; } void randomizeBoard() { for (int x=0; x < cols; x++) { // loop through every column for (int y=0; y < rows; y++) { // loop through every row world[x][y] = int(random(2)); // place a 0 or 1 into the world if (world[x][y] == 1) { drawCell(x, y, 1); // if world holds a 1 then draw a circle } else { drawCell(x, y, 0); // if world holds a 1 then draw a circle } } } } void speed(int value) { frameRate(value); }

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