python matplotlib指北针

要在Python的Matplotlib中添加指北针，可以使用以下代码进行操作：

import matplotlib.patches as mpatches
import matplotlib.pyplot as plt

def add_north(ax, labelsize=18, loc_x=0.88, loc_y=0.85, width=0.06, height=0.09, pad=0.14):
    """
    画一个比例尺带'N'文字注释
    主要参数如下
    :param ax: 要画的坐标区域 Axes实例 plt.gca()获取即可
    :param labelsize: 显示'N'文字的大小
    :param loc_x: 以文字下部为中心的占整个ax横向比例
    :param loc_y: 以文字下部为中心的占整个ax纵向比例
    :param width: 指南针占ax比例宽度
    :param height: 指南针占ax比例高度
    :param pad: 文字符号占ax比例间隙
    :return: None
    """
    minx, maxx = ax.get_xlim()
    miny, maxy = ax.get_ylim()
    ylen = maxy - miny
    xlen = maxx - minx

    left = [minx, xlen*(loc_x - width*.5), miny, ylen*(loc_y - pad)]
    right = [minx, xlen*(loc_x + width*.5), miny, ylen*(loc_y - pad)]
    top = [minx, xlen*loc_x, miny, ylen*(loc_y - pad + height)]
    center = [minx, xlen*loc_x, left + (top - left<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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