diff --git a/Software/python/sliders.py b/Software/python/sliders.py new file mode 100644 index 0000000..3131ccf --- /dev/null +++ b/Software/python/sliders.py @@ -0,0 +1,75 @@ +''' 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) + + +# 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) + +for w in [offset, amplitude, phase, freq]: + w.on_change('value', update_data) + + +# 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" \ No newline at end of file