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 <[email protected]> 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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