Show terminal value on the right, and show cross hairs, of a line chart

[Ivan_Figueredo]

I am able to plot fine like this:

df = GetDF['change']
st.line_chart(df)

Is there a way to tell the line chart to display the terminal value at the right y-axis?

Also, is there a way to turn on cross-hairs on a linechart?

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[Caroline]

Shared this on your StackOverflow post but I’ll paste below as well

st.line_chart() is essentially a wrapper around st.altair_chart() with less customizability. To customize your chart more, you’ll want to use st.altair_chart . This post explains how to add a label to an Altair chart for the point with the max x value. You can then pass your Altair chart with labels to st.altair_chart .

[Ivan_Figueredo]

Hi Caroline,

I see this example program but I don’t see the line?

import altair as alt
import pandas as pd

df = pd.DataFrame({
    'x': np.random.randn(100),
    'y': np.random.randn(100)
})

chart = alt.Chart(df).mark_point().encode(x='x', y='y')
line = alt.Chart(pd.DataFrame({'y': [1]})).mark_rule().encode(y='y')

chart + line

[Caroline]

Based on this post, it looks you need to use the aggregate parameter for this. This is the snippet that was shared on the StackOverflow thread:

labels = alt.Chart(data_core_sub).mark_text(align='left', dx=3).encode(
    alt.X('days:Q', aggregate='max'),
    alt.Y('value:Q', aggregate={'argmax': 'days'}, scale=alt.Scale(type='log')),
    alt.Text('country'),
    alt.Color('country:N', legend=None, scale=alt.Scale(domain=countries_list,type='ordinal')), 
).properties(title='COVID-19 total deaths', width=600)