[英]problem in sorting bar chart in altair that layered with a mark text
chart_df= alt.Chart(df).mark_bar().encode(
x = 'value',
y = alt.Y('name', sort='-x'),
color = 'variable'
)
为了将每个条的值添加为文本,我使用下面的代码,但我丢失了排序条。
chart_df_text = chart_df.mark_text().encode(
x = 'text_margin_from_bar:Q',
text = 'human_readable_value:Q',
).transform_calculate(
human_readable_value = expr.toString(expr.floor(datum.value/10**7)),
text_margin_from_bar = datum.value + (datum.value/expr.abs(datum.value))*1000000000
# i have negetive and positive numbers, so for have a space between number and bar, i do this
)
添加
y = alt.Y('name', sort='-x'),
到 chart_df_text 但我仍然有问题。 我读了另一个有我的问题的问题,说问题是 altair 的版本,但我在最后一个。
javascript 控制台中的警告告诉您为什么这不起作用:
[Warning] Dropping sort property {"field":"value","op":"sum"} as unioned domains only support boolean or op "count", "min", and "max".
[Warning] Domains that should be unioned has conflicting sort properties. Sort will be set to true.
您可以通过在您的排序中使用支持的op
来解决此问题。 例如:
import pandas as pd
import altair as alt
from altair import expr, datum
df = pd.DataFrame({
'value': [-3E9, -4E9, 6E9, 1E10, -8E9],
'name': ['Bob', 'Sue', 'Tim', 'Ann', 'Bill'],
'variable': range(5)
})
chart_df= alt.Chart(df).mark_bar().encode(
x = 'value',
y = alt.Y('name', sort=alt.EncodingSortField('value', op='min', order='descending')),
color = 'variable'
)
chart_df_text = chart_df.mark_text().encode(
x = 'text_margin_from_bar:Q',
text = 'human_readable_value:Q',
).transform_calculate(
human_readable_value = expr.toString(expr.floor(datum.value/10**7)),
text_margin_from_bar = datum.value + (datum.value/expr.abs(datum.value))*1000000000
)
chart_df + chart_df_text
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