Matplotlib基本图形之折线图

折线图特点 折线图是用折线将各数据连起来组成的图形
常用来观察数据随时间变化的趋势
例如:股票价格,温度变化,等等 示例代码:
import os
import time
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.dates as mdates basedir = os.path.dirname(os.path.abspath(__file__))
resultdir = os.path.join(basedir, 'result') class Create_plot(object): def __init__(self,data1,data2,dst,name='',title='Title',color='r',mark='o',alpha=1):
''' :param data1: x轴使用的数据,一般为列表
:param data2: y轴使用的数据,一般为列表
:param dst: 存放生成图片的文件夹路径
:param name: 图片的名称,默认为当前时间戳
:param title: 图片的标题,默认为Title
:param c: 图片的颜色,默认为红色
:param mark: 图片点的形状,默认为圆形
:param alpha: 点的透明度,默认为1,即不透明
'''
self.x = data1
self.y = data2
self.dst = dst
self.name = name if name else str(int(time.time()))
self.title = title
self.color = color
self.marker = mark
self.alpha = alpha def drew_normal(self):
plt.plot(
self.x,
self.y,
color = self.color,
marker=self.marker,
alpha = self.alpha
)
plt.title(self.title)
picname = self.name+'.jpg'
picdir = os.path.join(self.dst, picname)
plt.savefig(picdir) def drew_date(self):
plt.plot_date(
self.x,
self.y,
color = self.color,
marker=self.marker,
alpha = self.alpha,
linestyle = '-'
)
plt.title(self.title)
picname = self.name+'.jpg'
picdir = os.path.join(self.dst, picname)
plt.savefig(picdir)
# plt.show()

绘制基本折线图

temp = [2,4,7,10,11,13,15,18,17,13,10,7]
hour = [0,2,4,6,8,10,12,14,16,18,20,22] PIC = Create_plot(hour,temp,resultdir)
PIC.drew_normal()

结果如下:

Matplotlib基本图形之折线图-LMLPHP

绘制日期格式折线图

money = [100,500,800,600,300]
date = ['2018/6/1','2018/7/1','2018/8/1','2018/9/1','2018/10/1']
strconverter = mdates.strpdate2num('%Y/%m/%d')
date = [strconverter(x) for x in date] PIC = Create_plot(date, money,resultdir)
PIC.drew_date()

结果如下:

Matplotlib基本图形之折线图-LMLPHP

05-15 10:33