I have a scatter plot involving a categorical axis in which I’d like to have some jitter to the categorical values. The jitter function accomplishes this, providing the corresponding factor range as range argument. But when I reorder the range (and axis), the jittered points don’t move along with it as I expected—they stay put. If this is the intended behavior, is there a straightforward way I can get the jittered values to move when the range changes? Below is a brief example where a button reverses a categorical axis: red jittered points move, blue jittered ones don’t. (Tested in 2.2.0, 2.2.3, 2.3.0dev8)
from bokeh.transform import jitter
from bokeh.models import ColumnDataSource, FactorRange, CustomJS
from bokeh.models.widgets import Button
from bokeh.layouts import column
from bokeh.plotting import figure
from bokeh.io import show
source = ColumnDataSource({
'name': ['a', 'a', 'a', 'a', 'a'],
'val': [1, 1, 1, 1, 1],
})
p = figure(x_range=FactorRange(factors=['a', 'b']),
y_range=(0, 2), plot_width=200, plot_height=200)
p.scatter(x=jitter('name', 0.5, range=p.x_range), y='val', size=5, alpha=0.5, color='blue', source=source)
p.scatter(x='name', y=jitter('val', 0.5), size=5, color='red', alpha=0.5, source=source)
button = Button(label='Reorder factors')
button.js_on_click(CustomJS(args={'x_range': p.x_range}, code="""
const factors = [...x_range.factors];
const reversed = factors.reverse();
x_range.factors = reversed;
"""))
column = column(button, p)
show(column)
