OSMnx将标题添加到图形图 [英] OSMnx Add Title to Graph Plot

问题描述

我正在使用Geoff Boeing创建的精彩的 OSMnx库.我正在根据他的

I'm using the wonderful OSMnx library created by Geoff Boeing. I am plotting a street network based on one of his tutorials. Everything works perfectly. However, I would like to plot more than 40 graphs, using different centralities. Therefore, I would like to add a title with each district and centrality name to each plot. Currently, it looks like this.

绘制OSMnx街道网络

这就是我的代码.

def display_most_important_node(G_centralities_sorted_dict, G_dictionary, district, centrality_measure='betweenness_centrality'):
    node_color = ['red' if node == G_centralities_sorted_dict[district][centrality_measure][0][0] else '#336699' for node in ox.project_graph(G_dictionary[district]).nodes()]
    node_size = [40 if node == G_centralities_sorted_dict[district][centrality_measure][0][0] else 20 for node in ox.project_graph(G_dictionary[district]).nodes()]

    fig, ax = ox.plot_graph(ox.project_graph(G_dictionary[district]), annotate=False, edge_linewidth=1.5, node_size=node_size, fig_height=10, node_color=node_color, node_zorder=2)

谢谢你们.

推荐答案

默认情况下，OSMnx程序包的函数在返回fig和ax句柄之前已经调用了plt.show()，这意味着您不能再操作Figure和Axes实例(我的猜测是这样做是为了防止图形在创建后失真).这是通过使用称为save_and_show()的特殊功能(在内部调用)来完成的.您可以通过将关键字show=False和close=False传递给相应的绘图功能来防止图形显示(需要close=False，因为未自动显示的图形默认情况下会在save_and_show()中关闭).使用这些关键字后，可以在函数调用后操作fig和ax，但是现在必须显式调用plt.show().这里还是OP之后的完整示例:

By default, the functions of the OSMnx package call plt.show() already before they return the fig and ax handles, which means you can no longer manipulate the Figure and Axes instances (my guess is that this is done to prevent distortion of the Figure after creation). This is done using a special function called save_and_show(), which is called internally. You can prevent the showing of the figure by passing the keywords show=False and close=False to the according plotting function (close=False is needed because figures that are not automatically shown are by default closed within save_and_show()). With these keywords used, fig and ax can be manipulated after the function call, but now plt.show() has to be called explicitly. Here still a complete example following the OP:

def display_most_important_node(G_centralities_sorted_dict, G_dictionary, district, centrality_measure='betweenness_centrality'):
    node_color = ['red' if node == G_centralities_sorted_dict[district][centrality_measure][0][0] else '#336699' for node in ox.project_graph(G_dictionary[district]).nodes()]
    node_size = [40 if node == G_centralities_sorted_dict[district][centrality_measure][0][0] else 20 for node in ox.project_graph(G_dictionary[district]).nodes()]

    fig, ax = ox.plot_graph(ox.project_graph(G_dictionary[district]), annotate=False, edge_linewidth=1.5, node_size=node_size, fig_height=10, node_color=node_color, node_zorder=2, show=False, close=False)

    ax.set_title('subplot title')
    fig.suptitle('figure title')
    plt.show()

请注意，并非所有OSMnx函数都接受show和close关键字.例如，plot_shape不会.希望这会有所帮助.

Note that not all OSMnx functions accept the show and close keywords. For instance, plot_shape does not. Hope this helps.

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