[Bokeh] Bug in annular wedge/wedge hover tooltip

Hi everyone,
I don’t know if I state the obvious but I have a strange behavior in the annular wedge plot:

Let’s take a piece of the cake in an annular wedge. In some part of the wedge piece, the hover display correctly the tooltip :

In some other part of the same “piece” the tooltip is not displayed (I put a black x where the mouse is because you cannot see it):

Well, in both cases I should see the same tooltip, but is not the case (the piece of the wedge is the same). There is actually a way to fix this? I notice the same problem in the basic wedge plot.

Hope to be clear in explain myself,

thank you,

This is probably this known bug:

  Correctly showing Wedge Hover Tooltips with "clock" orient · Issue #7428 · bokeh/bokeh · GitHub

There is a possible workaround to try in that issue as well.

Thanks,

Bryan

Hello Bryan,

the bug you said was a bit different, it was related to a multiple hover for a given portion. In my case the hover does not appear in a uniform way (sometimes pop out, sometimes not), given a single portion. Anyway I tried the workaround inside the issue, without success. Do you suggest another workaround?

Thank you,

David

Hi,

I'm sorry, I can't really say much of anything with so little information. If you can post a complete code sample, I can try to run it and comment more.

Thanks,

Bryan

Hi,
Searching this strange behaviour and landed to this post.
I got this strange behaviour several times. 2 things i noticed,

1. it is due to legend overlay on top of plot. In the case even legend.visible is set to False, but it blocks the hover tool display properly.

2. unknown reason. annular wedge from following code gives the issue.

import pandas as pd
import numpy as np
from bokeh.plotting import figure
from bokeh.io import show
from bokeh.models import HoverTool, ColumnDataSource
from bokeh.palettes import Category20
from bokeh.transform import cumsum


###->data
data = {"Code": [11,8,4,2,6,1,13,10,5,9],
        "Count": [820,277,272,164,94,67,62,53,17,2],
        "Rate": [0.4486,0.1515,0.1488,0.0897,0.0514,0.0367,0.0339,0.0290,0.0093,0.0011]}

hover_issue_demo_df = pd.DataFrame(data)
hover_issue_demo_df["Colour"] = Category20[len(hover_issue_demo_df["Code"])]
hover_issue_demo_df["cum_s"] = (hover_issue_demo_df["Rate"].cumsum().shift(1).fillna(0))*2*np.pi
hover_issue_demo_df["cum"] = (hover_issue_demo_df["Rate"].cumsum())*2*np.pi

###->CDS source
CDS_hover_issue_demo_df = ColumnDataSource(hover_issue_demo_df)

##->figure
p_hover_issue_demo_df = figure(plot_width=400, plot_height=400, title="Demo", x_range=(-0.5, 0.5), y_range=(-1, 1))

p_hover_issue_demo_df.annular_wedge(x=0, y=0, 
                                    inner_radius=0.2, outer_radius=0.35,
                                    source=CDS_hover_issue_demo_df,
                                    start_angle="cum_s", end_angle="cum", 
                                    color="Colour"
                                    )

###->add hovertool
hover = HoverTool(tooltips=[("Count", "@Count{0,0}"), ("Percentage", "@Rate{0.0000%}")], mode="mouse", point_policy="follow_mouse")
p_hover_issue_demo_df.add_tools(hover)

show(p_hover_issue_demo_df)

On the result plot, these areas are blind spot, hover does not display.

Regards
mhLearn

@mhlearn This definitely seems like a bug so I’d encourage you to report this as a GitHub issue so that it can be tracked and prioritized.

thanks @Bryan, had reported this @ [BUG]Annular Wedge Hovertools Dead Areas · Issue #9492 · bokeh/bokeh · GitHub