Gradient colored area plot with holoviz

gradient_fill.py

import datashader as ds
import holoviews as hv
import hvplot.pandas
import numpy as np
import pandas as pd
import panel as pn
from holoviews.operation.datashader import datashade

# Sample data
np.random.seed(42)
df = pd.DataFrame({'x': np.arange(100), 'y': np.cumsum(np.random.randn(100))})

# Create a gradient fill based on the 'y' value
def color_fn(data):
    colors = hv.plotting.util.color_intervals(data.y, ['#0000ff', '#ff0000'], 256)
    return colors


gradient_fill = datashade(
    hv.Area(df, 'x', 'y'), aggregator=ds.mean('y'), color_fn=color_fn
)

# Create a Panel app
app = pn.panel(gradient_fill)

# Serve the app
app.servable()