demo_bokeh_server.py 文件源码

def modify_doc(doc):
    data_url = "http://www.neracoos.org/erddap/tabledap/B01_sbe37_all.csvp?time,temperature&depth=1&temperature_qc=0&time>=2016-02-15&time<=2017-03-22"
    df = pd.read_csv(data_url, parse_dates=True, index_col=0)
    df = df.rename(columns={'temperature (celsius)': 'temperature'})
    df.index.name = 'time'

    source = ColumnDataSource(data=df)

    plot = figure(x_axis_type='datetime', y_range=(0, 25), y_axis_label='Temperature (Celsius)',
                  title="Sea Surface Temperature at 43.18, -70.43")
    plot.line('time', 'temperature', source=source)

    def callback(attr, old, new):
        if new == 0:
            data = df
        else:
            data = df.rolling('{0}D'.format(new)).mean()
        source.data = ColumnDataSource(data=data).data

    slider = Slider(start=0, end=30, value=0, step=1, title="Smoothing by N Days")
    slider.on_change('value', callback)

    doc.add_root(column(slider, plot))

    doc.theme = Theme(json=yaml.load("""
        attrs:
            Figure:
                background_fill_color: "#DDDDDD"
                outline_line_color: white
                toolbar_location: above
                height: 500
                width: 800
            Grid:
                grid_line_dash: [6, 4]
                grid_line_color: white
    """))