#encoding=utf-8
import?numpy?as?np
from?numpy.linalg?import?*
import?matplotlib.pyplot?as?plt
#本節(jié)主要講解對(duì)?mataplotlib?使用

def?main():
????#line?畫線
????#定義x變量范圍
????x?=?np.linspace(-np.pi,np.pi,256,endpoint=True)
????#定義?c，s?兩個(gè)三角函數(shù)，變量都是x
????c,s=np.cos(x),np.sin(x)

????plt.figure(1)
????#開始畫函數(shù)c的曲線，并設(shè)置線的樣式
????plt.plot(x,c,color="blue",linewidth=1.0,linestyle="-",label="COS",alpha=0.5)
????#?開始畫函數(shù)s的曲線，并設(shè)置線的樣式
????plt.plot(x,s,"r*",label="SIN")
????#?圖形標(biāo)題設(shè)置
????plt.title("COS?&?SIN")
????#?定義坐標(biāo)軸對(duì)象
????ax=plt.gca()
????#設(shè)置坐標(biāo)軸具體位置
????ax.spines["right"].set_color("none")
????ax.spines["top"].set_color("none")
????ax.spines["left"].set_position(("data",0))
????ax.spines["bottom"].set_position(("data",0))
????ax.xaxis.set_ticks_position("bottom")
????ax.yaxis.set_ticks_position("left")
????#設(shè)置x軸和y軸的坐標(biāo)顯示
????plt.xticks([-np.pi,-np.pi/2,0,np.pi/2,np.pi],
???????????????[r'$-\pi$',r'$-\pi/2$',r'$0$',r'$+\pi/2$',r'$+\pi$'])
????plt.yticks(np.linspace(-1,1,5,endpoint=True))
????#設(shè)置字體大小
????for?label?in?ax.get_xticklabels()+ax.get_yticklabels():
????????label.set_fontsize(16)
????????label.set_bbox(dict(facecolor="white",edgecolor="None",alpha=0.2))
????#設(shè)置?legend?圖例圖標(biāo)
????plt.legend(loc="upper?left")
????#設(shè)置?grid?網(wǎng)格線
????plt.grid()
????#設(shè)置?顯示范圍
????#?plt.axis([-1,1,-0.5,1])
????#填充顏色
????plt.fill_between(x,np.abs(x)<0.5,c,c>0.5,color="green",alpha=0.25)

????plt.show()


if?__name__=="__main__":
????main()

???