Select Regions of Line Plot with BoxSelectTool

On Mar 16, 2017, at 09:27, seanmylaw@gmail.com wrote:

I have a simple scatter plot where I can select any points with the BoxSelectTool and the indices for the selected points are printed:

#!/usr/bin/env python

import numpy as np
from bokeh.plotting import figure, ColumnDataSource, curdoc

p = figure(title = "My chart", tools='box_select')

source = ColumnDataSource(
    dict(
        x=list(range(0, 10)),
        y=list(np.random.normal(0, 1, 10)),
    )
)

p.scatter("x", "y",source=source, color='black')

def update(attr, old, new):
    inds = np.array(new['1d']['indices'])
    print(inds)

source.on_change('selected', update)

curdoc().add_root(p)

However, when I change the plot from scatter to line:

#!/usr/bin/env python

import numpy as np
from bokeh.plotting import figure, ColumnDataSource, curdoc

p = figure(title = "My chart", tools='box_select')

source = ColumnDataSource(
    dict(
        x=list(range(0, 10)),
        y=list(np.random.normal(0, 1, 10)),
    )
)

#p.scatter("x", "y",source=source, color='black')
p.line("x", "y",source=source, color='black')

def update(attr, old, new):
    inds = np.array(new['1d']['indices'])
    print(inds)

source.on_change('selected', update)

curdoc().add_root(p)

In this case, nothing gets selected or printed when I use the BoxSelectTool. Any suggestions for how to get this to work? I can't tell if this is an issue to be filed.

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On Thursday, March 16, 2017 at 10:39:06 AM UTC-4, Bryan Van de ven wrote:

Hi,

Line glyphs currently only support hit testing by point and by span. There’s not some huge technical hurdle, but it’s never be exactly clear to me what the right policy for hit testing lines against rects should be. Is it sufficient to have any part of a line in the box? Or does all of a line have to be contained? I don’t see an issue for this so I’d suggest opening one on GH and discussing your use case so that maybe we can hash out what the right behavior is.

Thanks,

Bryan

On Mar 16, 2017, at 09:27, sean...@gmail.com wrote:

I have a simple scatter plot where I can select any points with the BoxSelectTool and the indices for the selected points are printed:

#!/usr/bin/env python

import numpy as np

from bokeh.plotting import figure, ColumnDataSource, curdoc

p = figure(title = “My chart”, tools=‘box_select’)

source = ColumnDataSource(

dict(

    x=list(range(0, 10)),

    y=list(np.random.normal(0, 1, 10)),

)

)

p.scatter(“x”, “y”,source=source, color=‘black’)

def update(attr, old, new):

inds = np.array(new['1d']['indices'])

print(inds)

source.on_change(‘selected’, update)

curdoc().add_root(p)

However, when I change the plot from scatter to line:

#!/usr/bin/env python

import numpy as np

from bokeh.plotting import figure, ColumnDataSource, curdoc

p = figure(title = “My chart”, tools=‘box_select’)

source = ColumnDataSource(

dict(

    x=list(range(0, 10)),

    y=list(np.random.normal(0, 1, 10)),

)

)

#p.scatter(“x”, “y”,source=source, color=‘black’)

p.line(“x”, “y”,source=source, color=‘black’)

def update(attr, old, new):

inds = np.array(new['1d']['indices'])

print(inds)

source.on_change(‘selected’, update)

curdoc().add_root(p)

In this case, nothing gets selected or printed when I use the BoxSelectTool. Any suggestions for how to get this to work? I can’t tell if this is an issue to be filed.

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