function Peg(x, y, r) {
	var options = {
		restitution: 1,
		friction: 0,
		isStatic: true
	}
	this.body = Bodies.circle(x, y, r, options);
	this.r = r;
	World.add(world, this.body);
}

Peg.prototype.show = function() {
	fill(255,255,255);
	stroke(255,255,255);
	var pos = this.body.position
	push();
	translate(pos.x, pos.y);
	ellipse(0, 0, this.r * 2);
	pop();
}