def update(self):
<EOL>self.edges = np.zeros((self.ttree.nnodes - <NUM_LIT:1>, <NUM_LIT:2>), dtype=int)<EOL>self.verts = np.zeros((self.ttree.nnodes, <NUM_LIT:2>), dtype=float)<EOL>self.lines = []<EOL>self.coords = []<EOL>self.update_idxs()             <EOL>self.update_fixed_order()      <EOL>self.assign_vertices()         <EOL>self.assign_coordinates()      <EOL>self.reorient_coordinates()<EOL>
Updates cartesian coordinates for drawing tree graph