Thanks Luke and thanks for the work-around.
I will post a new issue this weekend.

Mark

On Friday, January 13, 2017 at 3:20:33 AM UTC-5, Luke Campagnola wrote:
>
> It's a bug! Would you mind opening a new issue on github?
>
> Here's a workaround:
>
>     curve.scatter.updateSpots()
>     curve.scene().update()
>
> On Wed, Jan 11, 2017 at 5:23 PM, Mark <mmen...@gmail.com <javascript:>> 
> wrote:
>
>> Hi Luke - 
>>
>> Thanks for all your work in pyqtgraph.
>> I'm using 0.10.0 with PyQT 5.7 on Windows 7.
>>
>> I have built a scrolling chart that loads data from a pandas dataframe 
>> that is populated from another process. It creates PlotDataItems with 500 
>> data points each. Then applies np.empty() to the numpy array it and loads 
>> it again with new data, etc.
>>
>> I have found that when I add a 'symbol' argument to the plot() method 
>> (see below), the previous PlotDataItems do not get shifted left during the 
>> shift process. However, the current PlotDataItem shifts to the left, 
>> correctly, in this situation. (See the attached screenshot: 
>> 'top_symbol_curve_does_not_shift_left.PNG' - you'll note lime green lines 
>> at the left of the screenshot where the top symbol-based plotdataitems get 
>> out of sync with the 'white line' plotdataitem.
>>
>> However, when I take out the symbol argument, the second line scrolls to 
>> the left perfectly (as you probably know - this a modification from one of 
>> your samples). See 'both_curves_shift_left.PNG' screenshot for how this 
>> works correctly.
>>
>>
>> <SNIPPET>
>>
>>
>>        for index,row in pandas_df.iterrows():
>>             move_value = move_position(0.15) # THIS IS A CALL TO A 
>> FUNCTION THAT GENERATES AN INCREMENTED VALUE INSTEAD OF USING NOW() 
>> TIMESTAMP
>>             shift = (move_value * -1)
>>
>>             for c in curves:
>>                 c.setPos(shift, 0) # moves the curve
>>
>>             for c2 in curves2:
>>                 c2.setPos(shift,0)
>>
>>
>>             i = ptr5 % 500
>>             if i==0:
>>                 curve = p5.plot()
>>                 curves.append(curve)
>>                 curve2 = p5.plot(pen=(32,178,170))  #<- WORKS FINE
>>                 #curve2 = p5.plot(pen=None,symbol='d', 
>> symbolBrush=(32,178,170)) <- ONLY THE CURRENT PLOTDATA ITEM SHIFTS. 
>> PREVIOUS ONES DO NOT
>>                 curves2.append(curve2)
>>                
>>                 last = data5[-1] #return last item in the list 
>>                 last2 = pyqt_dot_np[-1]
>>
>>                 data5 = np.empty([501,2]) #Return a new array of given 
>> shape and type, without initializing entries.
>>                 pyqt_dot_np = np.empty([501,2])
>>
>>                 data5[0] = last
>>                 pyqt_dot_np[0] = last2
>>
>>             else:
>>                curve = curves[-1] #return last item in the list
>>                curve2 = curves2[-1]
>>
>>             vb = curve.getViewBox()
>>             xrange = vb.viewRange()[0]  
>>
>>
>>             data5[i+1,0] = move_value
>>             pyqt_dot_np[i+1,0] = move_value
>>             data5[i+1,1] = row['Zscores'] # 2-D array - y values
>>             curve.setData(x=data5[:i+2, 0], y=data5[:i+2, 1])
>>             pyqt_dot_np[i+1,1] = row['Zscores'] + 0.5
>>             curve2.setData(x=pyqt_dot_np[:i+2, 0], y=pyqt_dot_np[:i+2, 1])
>>
>> </SNIPPET>
>>
>> Is this a bug?
>> Do I need to do something differently to scroll previously added symbol 
>> objects. 
>>
>> Thanks kindly,
>> Mark
>>
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