From 281972260d0302dddd23c0012bb025e5bfb04d63 Mon Sep 17 00:00:00 2001
From: Florian Pritz <bluewind@xinu.at>
Date: Sun, 28 Jul 2013 14:25:44 +0200
Subject: add plot.py

Signed-off-by: Florian Pritz <bluewind@xinu.at>
---
 plot.py | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100755 plot.py

diff --git a/plot.py b/plot.py
new file mode 100755
index 0000000..f4a7dc6
--- /dev/null
+++ b/plot.py
@@ -0,0 +1,79 @@
+#!/usr/bin/python3
+
+# based on https://github.com/cnvogelg/ardu/blob/master/datalog/tools/plot_log.py
+
+import sys
+import subprocess
+import os
+
+if len(sys.argv) != 3:
+  print("Usage: plot.py <log> <png>", file=sys.stderr)
+  sys.exit(1)
+
+log_file = sys.argv[1]
+png_file = sys.argv[2]
+rrd_file = "tmp.rrd"
+
+create = [
+  'rrdtool','create',rrd_file,'--step','30','--start',0,
+  'DS:temp:GAUGE:50:U:U',
+  'RRA:AVERAGE:0.5:1:10000',
+  'RRA:MIN:0.5:1:10000',
+  'RRA:MAX:0.5:1:10000'
+]
+
+graph = [
+  'rrdtool','graph',png_file,
+  '-s',None,'-e',None,
+  '--height=300','--width=750',
+  '--color=BACK#FFFFFF',
+  '--vertical-label', '°C',
+  '--title','Temperature',
+  '-l','25','-u','30',
+  'DEF:temp='+rrd_file+':temp:AVERAGE',
+  'LINE1:temp#3366CC'
+]
+
+samples = []
+f = open(log_file,"r")
+for line in f:
+  elem = line.split(' ')
+  temp = float(elem[1].split("=")[1])
+  ts = int(elem[0])
+  samples.append((ts,temp))
+f.close()
+
+# create rrd
+start_ts = samples[0][0]
+end_ts = samples[-1][0]
+create[6] = str(start_ts - 1)
+print("creating rrdb:",create)
+ret = subprocess.call(create)
+if ret != 0:
+  print("ERROR calling: {}".format(" ".join(create)))
+  sys.exit(1)
+
+# update rrd
+n = len(samples)
+for i in range(n):
+  print(i,n,end="\r")
+  sys.stdout.flush()
+  s = samples[i]
+  entry = "{}:{}".format(s[0],s[1])
+  cmd = ['rrdupdate',rrd_file,'--',entry]
+  ret = subprocess.call(cmd)
+  if ret != 0:
+    print("ERROR calling: {}".format(" ".join(cmd)))
+    sys.exit(1)
+
+# graph
+print("plotting rrdb:",graph)
+graph[4] = str(start_ts)
+graph[6] = str(end_ts)
+ret = subprocess.call(graph)
+if ret != 0:
+  print("ERROR calling: {}".format(" ".join(cmd)))
+  sys.exit(1)
+
+os.unlink(rrd_file)
+print("done")
-- 
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