ggplot/plotnine - 添加来自 geom_text() 的具有特定颜色的图例

Question

我有这个数据框：

df = pd.DataFrame({'Segment': {0: 'A', 1: 'B', 2: 'C', 3: 'D', 4: 'A', 5: 'B', 6: 'C', 7: 'D'},
                  'Average': {0: 55341, 1: 55159, 2: 55394, 3: 56960, 4: 55341, 5: 55159, 6: 55394, 7: 56960},
                  'Order': {0: 0, 1: 1, 2: 2, 3: 3, 4: 0, 5: 1, 6: 2, 7: 3},
                  'Variable': {0: 'None', 1: 'None', 2: 'None', 3: 'None', 4: 'One', 5: 'One', 6: 'One', 7: 'One'},
                  '$': {0: 40.6, 1: 18.2, 2: 78.5, 3: 123.3, 4: 42.4, 5: 24.2, 6: 89.7, 7: 144.1},
                  'ypos': {0: 96.0, 1: 55.4, 2: 181.2, 3: 280.4, 4: 96.0, 5: 55.4, 6: 181.2, 7: 280.4},
                  'yticks': {0: 20.3,1: 9.1,2: 39.25,3: 61.65,4: 21.2,5: 12.1,6: 44.85,7: 72.05}})

我用这个来绘制：

(ggplot(df, aes(x="Segment", y="$", ymin=0, ymax=300, fill="Variable"))
 + geom_col(position = position_stack(reverse = True), alpha=0.7)
 + geom_text(aes(x = "Segment", y = "ypos", label = "Average"), size=8, format_string="Average: \n ${:,.0f} CLP")
 + geom_text(aes(label = "$"), show_legend=True, position=position_stack(vjust = 0.5), size=8, format_string="%s"%(u"\N{dollar sign}{:,.0f} MM"))
)

我一直在寻找一种方法来添加 Average 的图例，（然后）我将删除条形图上的 'Average' 单词，只留下数字。但是，为了便于理解，额外的图例应与平均值颜色相同（可以是黄色、橙色或任何其他颜色，但不能使用红色或天蓝色，因为这些颜色已被使用）

Answer 1

您可以将颜色作为变量添加到 geom_text :

import plotnine
from plotnine import ggplot, geom_col, aes, position_stack, geom_text, scale_color_brewer, guides, guide_legend

(ggplot(df, aes(x="Segment", y="$", ymin=0, ymax=300, fill="Variable"))
 + geom_col(position = position_stack(reverse = True), alpha=0.7)
 + geom_text(aes(y = "ypos",color="Segment",label = "Average"), size=8, 
             show_legend=True,format_string="${:,.0f} CLP")
 + geom_text(aes(label = "$"), show_legend=True, position=position_stack(vjust = 0.5), 
             size=8, format_string="%s"%(u"\N{dollar sign}{:,.0f} MM"))
 + scale_color_brewer(type='qual', palette=2)
 + guides(color=guide_legend(title="Averages"))
)

ggplot/plotnine - 添加来自 geom_text() 的具有特定颜色的图例

ggplot/plotnine - adding a legend from geom_text() with specific color

ggplot2

pandas

plotnine