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"""
Slider Cutoff
=============
This example shows how to bind a variable parameter to a slider, and how to use the corresponding bound value to color data points. This example is based on an example from the Altair 4 documentation for Interactions, in which the interactivity was accomplished using a selection. The version below has been simplified significantly through the use of a variable parameter. Variable parameters were added in Altair 5.
"""
# category: interactive charts
import altair as alt
import pandas as pd
import numpy as np
rand = np.random.RandomState(42)
df = pd.DataFrame({
'xval': range(100),
'yval': rand.randn(100).cumsum()
})
slider = alt.binding_range(min=0, max=100, step=1)
cutoff = alt.param(bind=slider, value=50)
alt.Chart(df).mark_point().encode(
x='xval',
y='yval',
color=alt.condition(
alt.datum.xval < cutoff,
alt.value('red'), alt.value('blue')
)
).add_params(
cutoff
)
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