# https://altair-viz.github.io/gallery/line_chart_with_points.html

import altair as alt
import numpy as np
import pandas as pd

x = np.arange(100)
source = pd.DataFrame({"x": x, "f(x)": np.sin(x / 5)})

alt.Chart(source).mark_line(point=alt.OverlayMarkDef(color="red")).encode(
    x="x", y="f(x)"
)
