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.
>>>
>>>
--
You received this message because you are subscribed to the Google Groups
"pyqtgraph" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/pyqtgraph/ec607bd4-a728-4e12-83a0-d3fa308355c6%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
