graph.py

#!/usr/bin/env python

# This file is part of Openplotter.
# Copyright (C) 2015 by sailoog <https://github.com/sailoog/openplotter>
#
# Openplotter is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# any later version.
# Openplotter is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Openplotter. If not, see <http://www.gnu.org/licenses/>.

import matplotlib.pyplot as plt
import matplotlib.dates as mdates
import os, sys, datetime, csv
from matplotlib.widgets import Cursor

pathname = os.path.dirname(sys.argv[0])
currentpath = os.path.abspath(pathname)

ifile  = open(currentpath+'/weather_log.csv', "r")
reader = csv.reader(ifile)
log_list = []
for row in reader:
	log_list.append(row)
ifile.close()

dates=[]
pressure=[]
temperature=[]
humidity=[]

for i in range(0,len(log_list)):
	dates.append(datetime.datetime.fromtimestamp(float(log_list[i][0])))
	pressure.append(round(float(log_list[i][1]),1))
	temperature.append(round(float(log_list[i][2]),1))
	humidity.append(round(float(log_list[i][3]),1))

if len(dates)==0:
        dates.append(datetime.datetime.now())
        pressure.append(0)
        temperature.append(0)
        humidity.append(0)

fig=plt.figure()
plt.rc("font", size=10)
fig.canvas.set_window_title('Thermograph / Barograph / Hygrograph')
ax1 = fig.add_subplot(311)
ax2 = fig.add_subplot(312, sharex=ax1)
ax3 = fig.add_subplot(313, sharex=ax1)

ax1.plot(dates,temperature,'ro-')
ax1.xaxis.set_major_formatter(mdates.DateFormatter('%d-%m-%y %H:%M'))
ax1.set_title('Temperature (Cel)')
ax1.grid(True)

ax2.plot(dates,pressure,'go-')
ax2.xaxis.set_major_formatter(mdates.DateFormatter('%d-%m-%y %H:%M'))
ax2.set_title('Pressure (hPa)')
ax2.grid(True)

ax3.plot(dates,humidity,'bo-')
ax3.xaxis.set_major_formatter(mdates.DateFormatter('%d-%m-%y %H:%M'))
ax3.set_title('Humidity (%)')
ax3.grid(True)

plt.tight_layout()
cursor = Cursor(ax1, useblit=True, color='gray', linewidth=1 )
cursor2 = Cursor(ax2, useblit=True, color='gray', linewidth=1 )
cursor3 = Cursor(ax3, useblit=True, color='gray', linewidth=1 )
fig.autofmt_xdate()
plt.show()