练习：绘制桃心线

#coding:utf-8
#/usr/bin/python
import numpy as np
import matplotlib as mpl
import matplotlib.pyplot as plt


if __name__ == '__main__':
    mpl.rcParams['font.sans-serif'] = [u'SimHei']
    mpl.rcParams['axes.unicode_minus'] = False  # win正常显示中文设置
    
    t = np.linspace(0, 2*np.pi, 100)
    x = 16 * np.sin(t) ** 3
    y = 13 * np.cos(t) - 5 * np.cos(2*t) - 2 * np.cos(3*t) - np.cos(4*t)
    plt.plot(x, y, 'r-', linewidth=2)
    plt.grid(True)
    plt.show()