Annotation Labels on Pie-Chart¶

Annotation Labels on Pie-Chart specifies content of the annotations.

Default presentation
Change default annotation
Use colors of the flavor scheme
Annotations for Pie-Chart with explode parameter
Annotations on scatter pie plot
Annotations for Pie-Chart with different sector's size

In [1]:

from lets_plot import *
from lets_plot.mapping import *

LetsPlot.setup_html() 

In [2]:

blank_theme = theme(line=element_blank(), axis_text=element_blank(), axis_title=element_blank(),
                    legend_position='none')

In [3]:

import pandas as pd

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

Out[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
3	4	audi	a4	2.0	2008	4	auto(av)	f	21	30	p	compact
4	5	audi	a4	2.8	1999	6	auto(l5)	f	16	26	p	compact

1.Default presentation¶

By default, geom_pie() doesn't display any annotations and is not very informative.

In [4]:

ggplot(mpg_df) + geom_pie(aes(fill='class'), size=22, hole=0.2)

Out[4]:

2. Change default annotation¶

Add simple annotations. Аnnotations are placed inside sectors. If they do not fit, then external labels will appear.

In [5]:

ggplot(mpg_df) + \
    geom_pie(aes(fill='class'), size=22, hole=0.2,
             labels=layer_labels().line('@class'),
             tooltips='none') + \
    scale_fill_brewer(palette='Dark2') + \
    blank_theme

Out[5]:

Add multiline annotations.

In [6]:

ggplot(mpg_df) + \
    geom_pie(aes(fill='class'), size=22, hole=0.2,
             labels=layer_labels()
                         .line('@class')
                         .line('(@{..prop..})')
                         .format('..prop..', '.0%'),
             tooltips='none') + \
    scale_fill_brewer(palette='Dark2') + \
    blank_theme

Out[6]:

You can change labels size with size() function.

In [7]:

ggplot(mpg_df) + \
    geom_pie(aes(fill=as_discrete('class', order_by='..count..')), size=20, hole=0.2,
             labels=layer_labels()
                         .line('@..proppct.. %')
                         .format('..proppct..', '.1f')
                         .size(18),
             tooltips='none') + \
    scale_fill_brewer(palette='Dark2') + \
    blank_theme

Out[7]:

For more complex settings, you can use theme text settings like size, color, bold, italic.

In [8]:

ggplot(mpg_df) + \
    geom_pie(aes(fill=as_discrete('class', order_by='..count..', order=1)), size=20, hole=0.3,
             labels=layer_labels()
                         .line('@..proppct.. %')
                         .format('..proppct..', '.1f'),
             tooltips='none') + \
    blank_theme + \
    theme(text=element_text(face='bold italic', size=16, color='#542788'), legend_position='right') 

Out[8]:

3. Use colors of the flavor scheme¶

You can combine Pie-Chart with different flavor schemes.

In [9]:

ggplot(mpg_df) + geom_pie(aes(fill=as_discrete('class', order_by='..count..')), size=20, hole=0.2,
             labels=layer_labels()
                         .line('@..proppct.. %')
                         .format('..proppct..', '.1f')
                         .size(18),
             tooltips='none') + \
    flavor_darcula() + \
    scale_fill_brewer(palette='Dark2') + \
    blank_theme

Out[9]:

4. Annotations for Pie-Chart with explode parameter¶

In [10]:

length = {
  'name' : ['20-50 km', '50-75 km', '10-20 km', '75-100 km', '3-5 km', '7-10 km', '5-7 km', '>100 km', '2-3 km'],
  'count': [1109, 696, 353, 192, 168, 86, 74, 65, 53],
  'explode': [0, 0, 0, 0.1, 0.1, 0.2, 0.3, 0.4, 0.6]
}

ggplot(length) + \
    geom_pie(aes(fill='name', slice='count', explode='explode'), stat='identity',
             stroke=1, stroke_color='black', size=20, hole=0.3,
             labels=layer_labels(['name', 'count'])) + \
    scale_fill_gradient(low='dark_blue', high='light_green') + \
    blank_theme

Out[10]:

5. Annotations on scatter pie plot¶

In [11]:

(ggplot(
  {
    'x': [1, 1, 1, 1, 1, 1.5, 1.5,   2,   2,   2 ],
    'y': [1, 1, 1, 1, 1,   2,   2, 1.5, 1.5, 1.5],
    's': [3, 1, 2, 1, 4,   1,   3,   3,   2,  1]
  }
) + xlim(0.5,2.5) + ylim(0.5,2.5) \
  + geom_pie(aes('x', 'y', slice='s', fill=as_discrete('s')),
             size=10, stat='identity',
             labels=layer_labels(['s']).size(16),
             tooltips='none'))

Out[11]:

6. Annotations for Pie-Chart with different sector's size¶

In [12]:

ggplot({'n': ["a", "b", "c"], 's': [1, 2, 3]}) + \
    geom_pie(aes(fill='n', slice='s', size='n'), stat="identity",
             labels=layer_labels().line('^fill (^slice)')) + \
    blank_theme + \
    theme(legend_position='right')

Out[12]: