matplotlib之设置特殊点及备注文本

清疚 2021-11-26 20:14 191阅读 0赞

import matplotlib.pyplot as mp
    import numpy as np
    
    x = np.linspace(-2 * np.pi, 2 * np.pi, 1000)
    y1 = np.cos(x)
    y2 = np.sin(x)
    mp.xticks([-2 * np.pi, -3 / 2 * np.pi, -np.pi, -1 / 2 * np.pi, 0, 1 / 2 * np.pi, np.pi, 3 / 2 * np.pi, 2 * np.pi],
              [r'$-2\pi$', r'$-\frac{3\pi}{2}$', r'$-\pi$', r'$-\frac{\pi}{2}$', r'$0$', r'$\frac{\pi}{2}$', r'$\pi$',
               r'$\frac{3\pi}{2}$',
               r'$2\pi$'])
    mp.yticks([-2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, 2])
    mp.figure('哈哈', facecolor='lightgray')
    mp.plot(x, y1, linestyle='-', linewidth=3, color='dodgerblue', alpha=0.5, label=r'$y_1 = cos(x)$')
    mp.figure('哈哈', facecolor='lightgray')
    mp.plot(x, y2, linestyle=':', linewidth=2, color='orangered', alpha=0.8, label=r'$y_2 = sin(x)$')
    ax = mp.gca()
    ax.spines['top'].set_color('none')
    ax.spines['right'].set_color('none')
    ax.spines['left'].set_position(('data', 0))
    ax.spines['bottom'].set_position(('data', 0))
    # 设置特殊点文本
    mp.annotate(r'$[\frac{\pi}{2},1]$', xycoords='data', xy=(np.pi / 2, 1), textcoords="offset points", xytext=(30, 30),
                fontsize=14, arrowprops=dict(arrowstyle='-|>', connectionstyle='angle3', color='red'))
    mp.annotate(r'$[\frac{\pi}{2},0]$', xycoords='data', xy=(np.pi / 2, 0), textcoords="offset points", xytext=(20, -30),
                fontsize=14, arrowprops=dict(arrowstyle='-|>', connectionstyle='angle3', color='red'))
    mp.scatter([np.pi / 2, np.pi / 2], [0, 1], marker='*', s=60, facecolor=(1, 1, 1, 1), edgecolor='red', zorder=3)
    # mp.hlines(1, -8, 8, colors='red', linestyles='--', linewidth=2)
    # mp.hlines(-1, -8, 8, colors='red', linestyles='--', linewidth=2)
    
    # mp.xlim(0, np.pi)
    # mp.ylim(0, 1)
    mp.legend(loc=1, bbox_to_anchor=(1.1, 1))
    mp.show()

![1494002-20190709162512524-2120475335.png][]

转载于:https://www.cnblogs.com/yuxiangyang/p/11158245.html

[1494002-20190709162512524-2120475335.png]: /images/20211126/3e1c6eae90da4036bd8eb8c37dfe2aea.png