HoverTool hit detection fails on vertical and near-vertical segment glyphs

Community Support
1

Maybe I’m doing something wrong, but the HoverTool does not appear to work for segment glyphs that have vertical orientation.

from bokeh.plotting import figure

from bokeh.models import HoverTool

hover = HoverTool(tooltips=[

("index", "$index"),

("(x,y)", "($x, $y)")

])

p = figure(title=“Background Analysis”,

       toolbar_location="above",

       tools=[hover],

       plot_width=400, 

       plot_height=400)

p.segment(

x0=[1, 2, 3], 

x1=[1, 2.4, 3.1],

y0=[1, 2, 3], 

y1=[2, 2.5, 3.7],

)

show(p)

I opened an issue on github, but maybe there’s a workaround or I’m doing something wrong?

Thanks,

Matt

2

Looking at the implementation:

  https://github.com/bokeh/bokeh/blob/master/bokehjs/src/coffee/models/glyphs/segment.coffee

I don't see anything offhand. But it's possible that:

* the third party spatial index we use (RBush) has a problem with vertical segments
* hittest.dist_to_segment has some obscure bug
* something else

It will require some investigation. If you have the ability to poke at it, I am happy to provide some debugging guidance. Otherwise it's probably not something that will be able to get a look until after the next release.

Some ideas for questions to answer that would provide additional useful information:

* does using tall, narrow quad/rect/vbar work?

* do vertical line or multilines work?

Answers to these questions could help narrow down where the problem actually is, and possibly provide a workaround in the immediate term.

Thanks,

Bryan

···

On Aug 8, 2017, at 14:43, Matt Blanchard <[email protected]> wrote:

Maybe I'm doing something wrong, but the HoverTool does not appear to work for segment glyphs that have vertical orientation.

from bokeh.plotting import figure
from bokeh.models import HoverTool

hover = HoverTool(tooltips=[
    ("index", "$index"),
    ("(x,y)", "($x, $y)")
])

p = figure(title="Background Analysis",
           toolbar_location="above",
           tools=[hover],
           plot_width=400,
           plot_height=400)

p.segment(
    x0=[1, 2, 3],
    x1=[1, 2.4, 3.1],
    y0=[1, 2, 3],
    y1=[2, 2.5, 3.7],
)

show(p)

I opened an issue on github, but maybe there's a workaround or I'm doing something wrong?

Thanks,
Matt

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