Controlling Legend Appearance with override_aes

The override_aes parameter in guide_legend() allows you to change the legend appearance.

import pandas as pd
from lets_plot import *

LetsPlot.setup_html()

mpg = pd.read_csv ("https://raw.githubusercontent.com/JetBrains/lets-plot-docs/master/data/mpg.csv")
mpg.head(3)

	Unnamed: 0	manufacturer	model	displ	year	cyl	trans	drv	cty	hwy	fl	class
0	1	audi	a4	1.8	1999	4	auto(l5)	f	18	29	p	compact
1	2	audi	a4	1.8	1999	4	manual(m5)	f	21	29	p	compact
2	3	audi	a4	2.0	2008	4	manual(m6)	f	20	31	p	compact

# Default legend

p = ggplot(mpg, aes('displ', 'hwy', color='drv')) + \
    geom_point(size=4, alpha=0.2, stroke=0)
p

# override_aes

p + guides(color=guide_legend(override_aes={'alpha': 0.3, 'size': 8}))