At the bottom of the Altair chart, I want to put my domain name. This is to watermark the chart. Is there a way to do this? Here's some sample code. I would like to put some text below the 100 on the x-axis. Is that possible?
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().encode(
x='x',
y='f(x)'
)
There's no way to add a specific watermark, but you can abuse the chart title to do this. For example:
alt.Chart(source).mark_line().encode(
x='x',
y='f(x)'
).properties(
title=alt.TitleParams(
'http://mywebsite.com',
color='lightgray',
baseline='bottom',
orient='bottom',
anchor='end'
)
)
If you still want an actual title on your chart, you can accomplish this by wrapping your chart in a concatenation, which has its own title:
chart = alt.Chart(source).mark_line().encode(
x='x',
y='f(x)'
).properties(
title="The Title"
)
alt.concat(chart,
title=alt.TitleParams(
'http://mywebsite.com',
color='lightgray',
baseline='bottom',
orient='bottom',
anchor='end'
)
)
