ConwayLife.com

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function next_step()
{
	var dx = x_shift[ant_d];
	var dy = y_shift[ant_d];
	var cx = (ant_x+dx+w)%w;
	var cy = (ant_y+dy+h)%h;
	
	var a = cy*w+cx;
	var s = currc[a];
	if (s)
		ant_d = (ant_d + 3) % 4
	else
		ant_d = (ant_d + 1) % 4
	currc[ant_y*w+ant_x] = 1 - s;
	ant_x = cx;
	ant_y = cy;

Code: Select all

var ant_x = (w / 2) | 0;
var ant_y = (h / 2) | 0;
var ant_d = 0;
var currc = new Uint8Array(w*h);

var x_shift = [1,0,-1,0];
var y_shift = [0,1,0,-1];