Create rectangular_coordirate-y=sin(x)cos(x)

Author: Listenpeng

matplotlib/rectangular_coordirate-y=sin(x)cos(x)

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+#!/usr/bin/ env python3
+#coding = utf-8
+import matplotlib.pyplot as plt
+import numpy as np
+
+#主要使用plt选择对象,这是面向过程的绘图方法
+
+#定义函数
+x = np.linspace(-4*np.pi,4*np.pi,1000 )
+a = np.sin(x)*np.cos(x)
+
+#定义画布，绘制图像
+ax = plt.figure(figsize=(8,4), dpi=100)
+plt.plot(x,a,color='red',label=r'$y=\sin(x)\cos(x)$')
+#显示图例
+plt.legend(loc=3)
+
+#指定轴标签的位置
+xticks = np.arange(-2*np.pi,3*np.pi,np.pi/2)
+yticks = np.arange(-1,1.5,0.5)
+#设置轴标签内容
+plt.xticks(xticks,[r'$2\pi$',r'$ -\frac{3\pi}{2}$','$-\pi$',r'$ -\frac{\pi}{2}$',r'o', r'$ \frac{\pi}{2}$','$\pi$',r'$ \frac{3\pi}{2}$','$2\pi$'])
+plt.yticks(yticks,['-1','-0.5','0.0','0.5','1.0'],fontsize=4)
+
+plt.xlim(-11,11,1.0)
+plt.ylim(-1.5,1.5)
+
+#设置图表标题
+plt.title(r'$y=\sin(x)\cos(x)$-graph')
+plt.rcParams['font.sans-serif']=['SimHei'] #用来正常显示中文标签
+plt.rcParams['axes.unicode_minus']=False #用来正常显示负号
+
+#获取绘图对象的操作
+ax = plt.gca()
+#去掉边框
+ax.spines['top'].set_color('none')
+ax.spines['right'].set_color('none')
+#移位置，设为原点相交
+ax.xaxis.set_ticks_position('bottom')
+ax.spines['bottom'].set_position(('data',0))
+ax.yaxis.set_ticks_position('left')
+ax.spines['left'].set_position(('data',0))
+
+#设置箭头
+plt.annotate('',xy=(0,1.5),xytext=(0,1.4), fontsize=8,
+             arrowprops=dict(facecolor='black',headwidth=4))
+plt.annotate('',xy=(11.0,0),xytext=(10.9,0), fontsize=4,
+             arrowprops=dict(facecolor='black',headwidth=4))
+
+
+#添加文字
+plt.text(1,1,u'$y=\sin(x)\cos(x)$')
+plt.text(0,0,'0')
+plt.savefig(u'../savefig/rectangular_coordirate-y=sin(x)cos(x).png')
+
+plt.show()
+