Thanks Patrick.
Actually your answer:
"# or indiscriminately remove anything that looks like a legend...
for item in plt.childItems():
if isinstance(item, pg.LegendItem):
plt.scene().removeItem(item)
"
Solved all my issues, so I don't need the self.l stuff.
Thanks again.
Cheers!
On Friday, May 10, 2019 at 11:35:08 PM UTC-7, Patrick wrote:
>
> Hi,
>
> Hi,
>
> You can remove the legend(s) altogether with something like:
> # Remove legends in your list
> for l in self.l:
> plt.scene().removeItem(l)
> self.l.removeItem(l)
>
> # or indiscriminately remove anything that looks like a legend...
>
> for item in plt.childItems():
> if isinstance(item, pg.LegendItem):
> plt.scene().removeItem(item)
>
> Also, I can see another problem you may have. If you are keeping a list of
> legend items (with self.l = [] and self.l.addItem(MyItemSample(c1), s[4])
> etc.), but are then are doing self.l = pg.LegendItem((100, 60), offset=(70,
> 30)), then you're clobbering your list. Any items inside the list and added
> to the scene will still exist, but you've lost the references to them, so
> you won't be able to remove them. Try something like
> l = pg.LegendItem((100, 60), offset=(70, 30))
> l.setParentItem(plotCanv.graphicsItem())
> # ...
> self.l.append(l)
>
> Patrick
>
>
>
>
> On Saturday, 11 May 2019 09:24:29 UTC+9:30, Jaime Heiss wrote:
>>
>> Hi again.
>> Actually I'm not being able to delete the legend. It works fine as long
>> as I don't add additional legends. If the number of legends increase, they
>> stay there forever.
>>
>> I have a qt designer GUI and when I add more signals to be plotted, I
>> get a large legend box that never shrinks back.
>> I'm rather new to this whole PyQt thing, so sorry if I am making obvious
>> mistakes.
>> Since the plotting routine is been called very frequently, I defined the
>> L object in the init as self.l=[]
>> Then, within my updateplot(self) method I have the following:
>>
>> self.l = pg.LegendItem((100, 60), offset=(70, 30)) # args are (size, offset)
>> self.l.setParentItem(plotCanv.graphicsItem()) # Note we do NOT call
>> plt.addItem in this case
>> # Crude patch of the legend paint() method
>> self.l.paint = types.MethodType(paint, self.l)
>> # Fix the spacing between legend symbol and text.
>> # This is probably needs to be added to the __init__() of LegendItem...
>> self.l.layout.setHorizontalSpacing(20)
>>
>>
>> and then for plotting on my plotCanv graphicsView I do
>>
>> plotCanv.plot(s[2][p0:pf],s[3][p0:pf],
>> pen=(i,len(self.sig2p)),connect="finite")
>>
>> and add the respective legend, which I try to store in self.addedplots
>> list so I can delete it latter.
>>
>>
>> c1 = plotCanv.plot([1,3,2,4], pen=(i,len(self.sig2p)),
>> fillLevel=100, fillBrush=(255,255,255),name=s[4])
>> self.l.addItem(MyItemSample(c1), s[4])
>> self.addedplots.append(c1)
>>
>>
>>
>>
>> So, before doing any of this plotting I am trying to delete the previous
>> stuff with this:
>>
>> plotCanv.clear()
>>
>> for sample in self.addedplots:
>> self.l.removeItem(sample)
>>
>>
>> But it's not working as prior legends just stay there, allthough the
>> previous plot gets deleted.
>> What I need (if I can't just remove the legends) is to completely wipe
>> out or restart the whole graphicsview widget.
>>
>> Any advice will be appreciated.
>>
>> Thanks!
>>
>>
>>
>> On Tuesday, April 23, 2019 at 8:37:18 PM UTC-7, Patrick wrote:
>>>
>>> Hi,
>>>
>>> Glad it is of some use to you! Items can be removed from the legend in
>>> two ways:
>>> # Remove by label
>>> l.removeItem("my red plot")
>>> # Remove by reference to plot item
>>> l.removeItem(c2)
>>>
>>>
>>> There isn't a l.clear() method or similar, which would be nice, but
>>> keeping with the theme of this thread, here's a hacky one-liner to do that:
>>> # Remove all items
>>> [ l.removeItem(sample.item) for sample, label in list(l.items) ]
>>>
>>> Patrick
>>>
>>> On Wednesday, 24 April 2019 09:22:58 UTC+9:30, Jaime Heiss wrote:
>>>>
>>>> Thank you so much Patrick.
>>>> This is almost perfect!
>>>> I just have one stupid question:
>>>> How do I clear the legend every time I clear the plot?
>>>>
>>>> Thanks!
>>>>
>>>> On Saturday, April 20, 2019 at 12:25:53 PM UTC-7, Jaime Heiss wrote:
>>>>>
>>>>> Hello.
>>>>> Is there any updated documentation about legend handling?
>>>>> I need to remove the box, change background color and make thicker
>>>>> lines as well as horizontal lines instead of the diagonals. If anybody
>>>>> could post an example, I will appreciate it.
>>>>>
>>>>> Thanks.
>>>>>
>>>>>
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