interaction_callbacks_in_python.py — Anaconda Enterprise 4.4 documentation

Anaconda Enterprise: Documentation

# interaction_callbacks_in_python.py

    from bokeh.layouts import column
    from bokeh.models import CustomJS, ColumnDataSource, Slider
    from bokeh.plotting import figure, output_file, show

    output_file("callback.html")

    x = [x*0.005 for x in range(0, 200)]
    y = x

    source = ColumnDataSource(data=dict(x=x, y=y))

    plot = figure(plot_width=400, plot_height=400)
    plot.line('x', 'y', source=source, line_width=3, line_alpha=0.6)

    def callback(source=source, window=None):
        data = source.data
        f = cb_obj.value                         # NOQA
        x, y = data['x'], data['y']
        for i in range(len(x)):
            y[i] = window.Math.pow(x[i], f)
        source.change.emit();

    slider = Slider(start=0.1, end=4, value=1, step=.1, title="power",
                    callback=CustomJS.from_py_func(callback))

    layout = column(slider, plot)

    show(layout)