protected void setNodePositionOffsets(){
nodePositions = new List<Rect>();
nodePositions.Add(new Rect(79, 18, 43, 48));
nodePositions.Add(new Rect(19, 106, 43, 48));
nodePositions.Add(new Rect(138, 107, 43, 48));
nodePositions.Add(new Rect(19, 194, 43, 48));
}