Ventricular rate from VRate tag.

VRate was ignored and ventricular rate was always calculated from RR Interval. Now if VRate is present it is used in the legend string, if VRate is not defined we fall back calculating the ventricular rate.

Author: marcodebe

ecg/ecg.py

@@ -342,6 +342,7 @@ def legend(self):
  'QT Interval',
  'QTc Interval',
  'RR Interval',
+ 'VRate',
  'QRS Duration',
  'QRS Axis',
  'T Axis',
@@ -350,18 +351,22 @@ def legend(self):
  ):
  ecgdata[cncs.CodeMeaning] = str(was.NumericValue)
 
- ret_str = "%s: -\n" % i18n.ventr_freq
- if ecgdata.get('RR Interval'):
+ # If VRate is not defined we calculate ventricular rate from
+ # RR interval
+ try:
+ vrate = float(ecgdata.get('VRate'))
+ except (TypeError, ValueError):
  try:
- bpm = (
+ vrate = (
  60.0 / self.duration *
- self.samples / float(ecgdata['RR Interval'])
+ self.samples / float(ecgdata.get('RR Interval'))
  )
- ret_str = "%s: %.1f BPM\n" % (i18n.ventr_freq, bpm)
- except ZeroDivisionError:
- pass
+ except (TypeError, ValueError, ZeroDivisionError):
+ vrate = "(unknown)"
 
+ ret_str = "%s: %.1f BPM\n" % (i18n.ventr_freq, vrate)
  ret_str_tmpl = "%s: %s ms\n%s: %s ms\n%s: %s/%s ms\n%s: %s %s %s"
+
  ret_str += ret_str_tmpl % (
  i18n.pr_interval,
  ecgdata.get('PR Interval', ''),