private void leftDown(float delta){
		if(selectedNode == null){
			for(Node node : this.getNodes()){
				double radiusSquared = node.size * node.size,
						dx = mouseX - node.position.x, dy = mouseY - node.position.y,
						distSquared;
				distSquared = dx * dx + dy * dy;
				if(distSquared <= radiusSquared){
					selectedIndicator.select(node);
					return;
				}
			}
		}
	}