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| ''' Present an interactive function explorer with slider widgets. | |
| Scrub the sliders to change the properties of the ``sin`` curve, or | |
| type into the title text box to update the title of the plot. | |
| Use the ``bokeh serve`` command to run the example by executing: | |
| bokeh serve sliders.py | |
| at your command prompt. Then navigate to the URL | |
| http://localhost:5006/sliders | |
| in your browser. | |
| ''' | |
| import numpy as np | |
| from bokeh.io import curdoc | |
| from bokeh.layouts import column, row | |
| from bokeh.models import ColumnDataSource, Slider, TextInput | |
| from bokeh.plotting import figure | |
| # Set up data | |
| N = 200 | |
| x = np.linspace(0, 4 * np.pi, N) | |
| y = np.sin(x) | |
| source = ColumnDataSource(data=dict(x=x, y=y)) | |
| # Set up plot | |
| plot = figure(plot_height=400, plot_width=400, title="my sine wave", | |
| tools="crosshair,pan,reset,save,wheel_zoom", | |
| x_range=[0, 4 * np.pi], y_range=[-2.5, 2.5]) | |
| plot.line('x', 'y', source=source, line_width=3, line_alpha=0.6) | |
| # Set up widgets | |
| text = TextInput(title="title", value='my sine wave') | |
| offset = Slider(title="offset", value=0.0, start=-5.0, end=5.0, step=0.1) | |
| amplitude = Slider(title="amplitude", value=1.0, start=-5.0, end=5.0, step=0.1) | |
| phase = Slider(title="phase", value=0.0, start=0.0, end=2 * np.pi) | |
| freq = Slider(title="frequency", value=1.0, start=0.1, end=5.1, step=0.1) | |
| slider_moves = {"offset": 0, "amplitude": 0, "phase": 0, "freq": 0} | |
| # Set up callbacks | |
| def update_title(attrname, old, new): | |
| plot.title.text = text.value | |
| text.on_change('value', update_title) | |
| def update_data(attrname, old, new): | |
| # Get the current slider values | |
| a = amplitude.value | |
| b = offset.value | |
| w = phase.value | |
| k = freq.value | |
| # Generate the new curve | |
| x = np.linspace(0, 4 * np.pi, N) | |
| y = a * np.sin(k * x + w) + b | |
| source.data = dict(x=x, y=y) | |
| def offset_force(attrname, old, new): | |
| slider_moves["offset"] += 1 | |
| if slider_moves["amplitude"] < slider_moves["offset"]: | |
| a = amplitude.value = offset.value | |
| w = phase.value = offset.value | |
| k = freq.value = offset.value | |
| b = offset.value | |
| x = np.linspace(0, 4 * np.pi, N) | |
| y = a * np.sin(k * x + w) + b | |
| source.data = dict(x=x, y=y) | |
| def amp_force(attrname, old, new): | |
| slider_moves["amplitude"] += 1 | |
| if slider_moves["offset"] < slider_moves["amplitude"]: | |
| b = offset.value = amplitude.value * 2 | |
| w = phase.value = amplitude.value * 2 | |
| k = freq.value = amplitude.value * 2 | |
| a = amplitude.value | |
| x = np.linspace(0, 4 * np.pi, N) | |
| y = a * np.sin(k * x + w) + b | |
| source.data = dict(x=x, y=y) | |
| for w in [phase, freq]: | |
| w.on_change('value', update_data) | |
| offset.on_change('value', offset_force) | |
| amplitude.on_change('value', amp_force) | |
| # Set up layouts and add to document | |
| inputs = column(text, offset, amplitude, phase, freq) | |
| curdoc().add_root(row(inputs, plot, width=800)) | |
| curdoc().title = "Sliders" | |