Bokeh - get information about selected points
I have a few things that I put into a scatter plot and display in a web browser window (using Bokeh).
I use PolySelectTool or BoxSelectTool for selection.
There are two things I would like to do: 1) Get information about the points that were selected in order to calculate some additional information. 2) Since dots represent URLs, I would like the chart to open a new browser tab and load a specific URL whenever I click a dot (representing a URL).
I don't think the code is important. But to finish my question, here it is ...
Y = my_data
urls = get_urls(my_data)
TOOLS="pan,wheel_zoom,reset,hover,poly_select,box_select"
p = figure(title = "My chart", tools=TOOLS)
p.xaxis.axis_label = 'X'
p.yaxis.axis_label = 'Y'
source = ColumnDataSource(
data=dict(
xvals=list(Y[:,0]),
yvals=list(Y[:,1]),
url=urls
)
)
p.scatter("xvals", "yvals",source=source,fill_alpha=0.2, size=5)
hover = p.select(dict(type=HoverTool))
hover.snap_to_data = False
hover.tooltips = OrderedDict([
("(x,y)", "($x, $y)"),
("url", "@url"),
])
select_tool = p.select(dict(type=BoxSelectTool))
#
# I guess perhaps something should be done with select_tool
#
show(p)
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You can get information using a property source.selected
, if you want to be notified of all changes, you must create a callback, it would be something like this:
def callback(obj, attr, old, new):
...
source.on_change('selected', callback)
See this example for details .
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