interaction_callbacks_for_hover.py — Anaconda Enterprise 4.4 documentation

Anaconda Enterprise: Documentation

# interaction_callbacks_for_hover.py

    from bokeh.plotting import figure, output_file, show
    from bokeh.models import ColumnDataSource, HoverTool, CustomJS

    output_file("hover_callback.html")

    # define some points and a little graph between them
    x = [2, 3, 5, 6, 8, 7]
    y = [6, 4, 3, 8, 7, 5]
    links = {
        0: [1, 2],
        1: [0, 3, 4],
        2: [0, 5],
        3: [1, 4],
        4: [1, 3],
        5: [2, 3, 4]
    }

    p = figure(plot_width=400, plot_height=400, tools="", toolbar_location=None, title='Hover over points')

    source = ColumnDataSource({'x0': [], 'y0': [], 'x1': [], 'y1': []})
    sr = p.segment(x0='x0', y0='y0', x1='x1', y1='y1', color='olive', alpha=0.6, line_width=3, source=source, )
    cr = p.circle(x, y, color='olive', size=30, alpha=0.4, hover_color='olive', hover_alpha=1.0)

    # Add a hover tool, that sets the link data for a hovered circle
    code = """
    var links = %s;
    var data = {'x0': [], 'y0': [], 'x1': [], 'y1': []};
    var cdata = circle.data;
    var indices = cb_data.index['1d'].indices;
    for (i=0; i < indices.length; i++) {
        ind0 = indices[i]
        for (j=0; j < links[ind0].length; j++) {
            ind1 = links[ind0][j];
            data['x0'].push(cdata.x[ind0]);
            data['y0'].push(cdata.y[ind0]);
            data['x1'].push(cdata.x[ind1]);
            data['y1'].push(cdata.y[ind1]);
        }
    }
    segment.data = data;
    """ % links

    callback = CustomJS(args={'circle': cr.data_source, 'segment': sr.data_source}, code=code)
    p.add_tools(HoverTool(tooltips=None, callback=callback, renderers=[cr]))

    show(p)