Plotnine :如何删除geom_line()中行周围的图例框

Question

考虑下面的plotnine图。如何删除图例中线条周围的伪框(在屏幕截图中圈出)。这些伪框不会出现在ggplot中。

我已经看了主题中的所有选项，但没有一个能做到这一点…https://plotnine.readthedocs.io/en/stable/generated/plotnine.themes.theme.html

import numpy as np
import pandas as pd
from plotnine import *


df = pd.DataFrame({
    'date':pd.date_range('1/1/2000', freq='A', periods=20),
    'a': np.random.uniform(0.01,0.03,20),
    'b': np.random.uniform(0.02,0.04,20),
})

df = pd.melt(df, id_vars=['date'])


p = (ggplot(df,aes(x='date',y='value',color='variable'))
  + theme_light()
  + geom_line(size=1.15)
  + labs(x=None, y=None)
  + scale_x_date(expand=(0,0), breaks=pd.date_range(start='2001-1-1', end='2019-1-1', periods=10), labels=lambda l: [v.strftime("%Y") for v in l])
  + scale_color_manual(('#50C878','#F75394'))
  + theme(
      legend_title=element_blank(),
      legend_direction='horizontal',
      legend_position='bottom',
      legend_box_spacing=0.25,
      legend_background=element_blank(),
      panel_grid_minor = element_blank(),
      panel_grid_major_x = element_blank(),
      panel_border = element_blank(),
  )
)
p

​

​

Answer 1

实现所需结果的一种方法是通过颜色(`legend_key=element_rect=“白色”)将图例键的颜色设置为“白色”，或者更一般地设置为背景颜色：

import numpy as np
import pandas as pd
from plotnine import *


df = pd.DataFrame({
    'date':pd.date_range('1/1/2000', freq='A', periods=20),
    'a': np.random.uniform(0.01,0.03,20),
    'b': np.random.uniform(0.02,0.04,20),
})
df = pd.melt(df, id_vars=['date'])

p = (ggplot(df,aes(x='date',y='value',color='variable'))
  + theme_light()
  + geom_line(size=1.15)
  + labs(x=None, y=None)
  + scale_x_date(expand=(0,0), breaks=pd.date_range(start='2001-1-1', end='2019-1-1', periods=10), labels=lambda l: [v.strftime("%Y") for v in l])
  + scale_color_manual(('#50C878','#F75394'))
  + theme(
      legend_title=element_blank(),
      legend_key=element_rect(color = "white"),
      legend_direction='horizontal',
      legend_position='bottom',
      legend_box_spacing=0.25,
      legend_background=element_blank(),
      panel_grid_minor = element_blank(),
      panel_grid_major_x = element_blank(),
      panel_border = element_blank()
  )
)
p

​

​