带工具提示的简单散点图

cars 数据集的散点图，当您将鼠标悬停在点上时，会显示所选列值的工具提示。我们将点放大，以便更容易悬停在其上。

方法语法

import altair as alt
from vega_datasets import data

source = data.cars()

alt.Chart(source).mark_circle(size=60).encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color='Origin',
    tooltip=['Name', 'Origin', 'Horsepower', 'Miles_per_Gallon']
).interactive()

属性语法

import altair as alt
from vega_datasets import data

source = data.cars()

alt.Chart(source).mark_circle(size=60).encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color='Origin',
    tooltip=['Name', 'Origin', 'Horsepower', 'Miles_per_Gallon']
).interactive()
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.