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"""
Interactive Scatter Plot and Linked Layered Histogram
=====================================================
This example shows how to link a scatter plot and a histogram
together such that clicking on a point in the scatter plot will
isolate the distribution corresponding to that point, and vice versa.
"""
# category: interactive charts
import altair as alt
import pandas as pd
import numpy as np
# generate fake data
source = pd.DataFrame({
'gender': ['M']*1000 + ['F']*1000,
'height':np.concatenate((
np.random.normal(69, 7, 1000), np.random.normal(64, 6, 1000)
)),
'weight': np.concatenate((
np.random.normal(195.8, 144, 1000), np.random.normal(167, 100, 1000)
)),
'age': np.concatenate((
np.random.normal(45, 8, 1000), np.random.normal(51, 6, 1000)
))
})
selector = alt.selection_point(fields=['gender'])
color_scale = alt.Scale(domain=['M', 'F'],
range=['#1FC3AA', '#8624F5'])
base = alt.Chart(source).properties(
width=250,
height=250
).add_params(selector)
points = base.mark_point(filled=True, size=200).encode(
x=alt.X('mean(height):Q').scale(domain=[0,84]),
y=alt.Y('mean(weight):Q').scale(domain=[0,250]),
color=alt.condition(
selector,
'gender:N',
alt.value('lightgray'),
scale=color_scale),
)
hists = base.mark_bar(opacity=0.5, thickness=100).encode(
x=alt.X('age')
.bin(step=5) # step keeps bin size the same
.scale(domain=[0,100]),
y=alt.Y('count()')
.stack(None)
.scale(domain=[0,350]),
color=alt.Color('gender:N', scale=color_scale)
).transform_filter(
selector
)
points | hists
|
