var Walker = function() {
	this.x = width / 2;
	this.y = height / 2;
};

Walker.prototype.display = function() {
	stroke(0, 0, 0);
	point(this.x, this.y);
};

Walker.prototype.walk = function() {
	var stepx = random(-1, 1);
	var stepy = random(-1, 1);
	this.x += stepx;
	this.y += stepy;
};

var w = new Walker();
draw = function() {
	w.walk();
	w.display();
};