exact scaling of the x-axis

In the wfrog user forum I posted the code for drawing vertival stripes for 
exact scaling the x-axis at first minutes of hour  / first hour of day / first 
day of week and first day of month.

https://groups.google.com/forum/?fromgroups#!topic/wfrog-users/X9JWYFmZGWg

See my attached screenshot with a 7 days view. The vertical stripe changed the 
colour at midnight.

This is only a sample code. I don't understand all wfrog data objects. With a 
dirty hack I reengineered the time spans from the labels of charts.  

> cat -n ./wfrender/renderer/chart.py
  405   # begin with stripe generation#            
   406          # Set the vertical stripes
   407          # use chart.fill_linear_stripes(Chart.CHART, 0, 'CCCCCC', 0.2, 'FFFFFF', 0.2)
   408          max_stripes=11
   409  
   410          #refill hh:mm from lbl2
   411          t_b = data[self.labels.split('.')[0]]['series']['lbl2'][0]
   412          t_b = t_b+'2001/01/01 00:00'[len(t_b):]
   413          t_begin = datetime.datetime.strptime(t_b, "%Y/%m/%d %H:%M")
   414          t_e = data[self.labels.split('.')[0]]['series']['lbl2'][-1]
   415          t_e = t_e+'2001/01/01 00:00'[len(t_e):]
   416          t_end = datetime.datetime.strptime(t_e, "%Y/%m/%d %H:%M")
   417          #print str(t_begin) +" bis "+ str(t_end)
   418          t_first = t_begin
   419          t_minutes = t_end - t_begin
   420          t_minutes_max = t_minutes.seconds/60 + t_minutes.days*1440
   421          tm=1
   422  
   423          if t_minutes_max < 60*max_stripes:
   424            # calc next hour
   425            t_delta=datetime.timedelta(hours=1)
   426            t_first=t_first.replace(minute=0)+t_delta
   427          elif t_minutes_max < 60*24*max_stripes:
   428            # calc next day
   429            t_delta=datetime.timedelta(days=1)
   430            t_first=t_first.replace(hour=0,minute=0)+t_delta  
   431          elif t_minutes_max < 60*24*7*max_stripes:
   432            # calc next monday
   433            t_first=t_first.replace(hour=0,minute=0)+datetime.timedelta(days=7-t_first.weekday())
   434            t_delta=datetime.timedelta(days=7)
   435          else:
   436            # calc first day of next month
   437            t_first=t_first.replace(day=1)+datetime.timedelta(days=32)
   438            t_first=t_first.replace(day=1,hour=0,minute=0)
   439            tm=0
   440            
   441          # generate stripes (calc with minutes of segments)
   442          stripe=[]
   443          i=0
   444          t_minutes_first= 0
   445          while t_first < t_end:      
   446            t_1 = t_first-t_begin
   447            # print t_1
   448            t_minutes_next = t_1.seconds/60 + t_1.days*1440
   449            #print t_minutes
   450            if i%2 == 0:
   451               stripe.append('FFFFFF')
   452            else:
   453              stripe.append('F0F0F0')
   454            i=i+1
   455            stripe.append(round(float(t_minutes_next-t_minutes_first)/t_minutes_max,2))
   456            t_minutes_first=t_minutes_next
   457            if tm == 1:
   458              t_first=t_first+t_delta
   459            else:
   460              ## calc first day of next month
   461              t_first=t_first.replace(day=1)+datetime.timedelta(days=32)
   462              t_first=t_first.replace(day=1)
   463          
   464          # calc last broken stripe (until length 1,0)
   465          if i%2 == 0:
   466               stripe.append('FFFFFF')
   467          else:
   468              stripe.append('F0F0F0')
   469          i=float(1-round(float(t_minutes_first)/t_minutes_max,2))
   470          stripe.append(i)
   471          
   472          # now draw stripes
   473          chart.fill_linear_stripes(Chart.CHART, 0, *stripe)    
   474  # end of stripe generation#
Original issue reported on code.google.com by f.friedr...@googlemail.com on 3 Apr 2012 at 11:09
Attachments:
7days.png
mrgmarsh / wfrog

exact scaling of the x-axis #111
