Selection1d points ¶
- Point Selection1D stream example
- A linked streams example demonstrating how to use Selection1D to get currently selected points and dynamically compute statistics of selection.
- streams, selection, interactive
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import numpy as np import holoviews as hv from holoviews import streams hv.extension('bokeh')
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%%opts Points [tools=['box_select', 'lasso_select']] # Declare some points points = hv.Points(np.random.randn(1000,2 )) # Declare points as source of selection stream selection = streams.Selection1D(source=points) # Write function that uses the selection indices to slice points and compute stats def selected_info(index): selected = points.iloc[index] if index: label = 'Mean x, y: %.3f, %.3f' % tuple(selected.array().mean(axis=0)) else: label = 'No selection' return selected.relabel(label).options(color='red') # Combine points and DynamicMap points + hv.DynamicMap(selected_info, streams=[selection])