a_star_search.py 文件源码

def DrawPath(G, source, dest):
    pos = nx.spring_layout(G)
    val_map = {}
    val_map[source] = 'green'
    val_map[dest] = 'red'
    values = [val_map.get(node, 'blue') for node in G.nodes()]
    nx.draw(G, pos, with_labels = True, node_color = values, edge_color = 'b' ,width = 1, alpha = 0.7)  #with_labels=true is to show the node number in the output graph
    edge_labels = dict([((u, v,), d['length']) for u, v, d in G.edges(data = True)])
    nx.draw_networkx_edge_labels(G, pos, edge_labels = edge_labels, label_pos = 0.5, font_size = 11) #prints weight on all the edges
    return pos



#main function