A-M baby

Task/Langtons-ant/JavaScript/langtons-ant-1.js

@@ -0,0 +1,101 @@
+// create global canvas
+var canvas = document.createElement('canvas');
+canvas.id = 'globalCanvas';
+document.body.appendChild(canvas);
+
+function langtonant(antx, optx) {
+	'use strict';
+	var x, y, i;
+
+	// extend default opts
+	var opts = {
+		gridsize: 100,
+		pixlsize: 4,
+		interval: 4
+	};
+	for (i in optx) {
+		opts[i] = optx[i];
+	}
+
+	// extend default ants
+	var ants = [{
+		x: 50,
+		y: 50,
+		d: 0
+	}];
+	for (i in antx) {
+		ants[i] = antx[i];
+	}
+
+	// initialise grid
+	var grid = [];
+	for (x = 0; x < opts.gridsize; x ++) {
+		grid[x] = [];
+		for (y = 0; y < opts.gridsize; y ++) {
+			grid[x][y] = true;
+		}
+	}
+
+	// initialise directions
+	var dirs = [
+		{x: 1, y: 0},
+		{x: 0, y: -1},
+		{x: -1, y: 0},
+		{x: 0, y: 1}
+	];
+
+	// initialise canvas
+	var canv = document.getElementById('globalCanvas');
+	var cont = canv.getContext('2d');
+	canv.width = opts.gridsize * opts.pixlsize;
+	canv.height = opts.gridsize * opts.pixlsize;
+
+	// initialise pixels
+	var pixlblac = cont.createImageData(opts.pixlsize, opts.pixlsize);
+	for (i = 0; i < (opts.pixlsize * opts.pixlsize * 4); i += 4) {
+		pixlblac.data[i + 3] = 255;
+	}
+	var pixlwhit = cont.createImageData(opts.pixlsize, opts.pixlsize);
+	for (i = 0; i < (opts.pixlsize * opts.pixlsize * 4); i += 4) {
+		pixlwhit.data[i + 3] = 0;
+	}
+
+	// run simulation
+	function simulate() {
+		var sane = true;
+
+		// iterate over ants
+		for (i = 0; i < ants.length; i ++) {
+			var n = ants[i];
+
+			// invert, draw, turn
+			if (grid[n.x][n.y]) {
+				grid[n.x][n.y] = false;
+				cont.putImageData(pixlblac, n.x * opts.pixlsize, n.y * opts.pixlsize);
+				n.d --;
+			} else {
+				grid[n.x][n.y] = true;
+				cont.putImageData(pixlwhit, n.x * opts.pixlsize, n.y * opts.pixlsize);
+				n.d ++;
+			}
+
+			// modulus wraparound
+			n.d += dirs.length;
+			n.d %= dirs.length;
+
+			// position + direction
+			n.x += dirs[n.d].x;
+			n.y += dirs[n.d].y;
+
+			// sanity check
+			sane = (n.x < 0 || n.x > opts.gridsize || n.y < 0 || n.y > opts.gridsize) ? false : sane;
+		}
+
+		// loop with interval
+		if (sane) {
+			setTimeout(simulate, opts.interval);
+		}
+	}
+
+	simulate();
+}

Task/Langtons-ant/JavaScript/langtons-ant-2.js

@@ -0,0 +1,5 @@
+langtonant({}, {
+	gridsize: 100,
+	pixlsize: 4,
+	interval: 4
+});

Task/Langtons-ant/JavaScript/langtons-ant-3.js

@@ -0,0 +1,19 @@
+langtonant([
+	{
+		x: (100 / 2) + 7,
+		y: (100 / 2) + 7,
+		d: 1
+	}, {
+		x: (100 / 2) + 7,
+		y: (100 / 2) - 7,
+		d: 2
+	}, {
+		x: (100 / 2) - 7,
+		y: (100 / 2) - 7,
+		d: 3
+	}, {
+		x: (100 / 2) - 7,
+		y: (100 / 2) + 7,
+		d: 0
+	}
+]);