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stripes.py
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stripes.py
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#! /usr/bin/python3
import locale
import random
import time
from math import sin
import rrdtool
start = int(time.time())
rrd = 'random.rrd'
rrdtool.create(rrd,
'--start', str(start-1),
'--step', '300',
'DS:a:GAUGE:600:U:U',
'DS:b:GAUGE:600:U:U',
'RRA:AVERAGE:0.5:1:200')
for t in range(start, start+200*300, 300):
rrdtool.update(rrd, '%s:%s:%s' % (
t,
random.randint(0, 100),
sin(t/800.)*50+50))
locale.setlocale(locale.LC_ALL, '') # enable localisation
rrdtool.graph('stripes.png',
'--title', 'Stripes Demo',
'--start', str(start),
'--end', str(start+400*60),
'--interlaced',
'--imgformat', 'PNG',
'--width=450',
'DEF:a=%s:a:AVERAGE' % rrd,
'DEF:b=%s:b:AVERAGE' % rrd,
'CDEF:alpha=TIME,1200,%,600,LT,a,UNKN,IF',
'CDEF:beta=TIME,1200,%,600,GE,b,UNKN,IF',
'AREA:alpha#0022e9:alpha',
'AREA:beta#00b674:beta',
'LINE1:b#ff4400:beta envelope\\c',
'COMMENT:\\s',
'COMMENT:alpha=TIME,1200,%,600,LT,a,UNKN,IF',
'COMMENT:beta=TIME,1200,%,600,GE,b,UNKN,IF\\j')
print('This script has created stripes.png in the current directory')
print('This demonstrates the use of the TIME and % RPN operators')