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 R语言ggplot2可视化删除图例（legend）周围的灰色矩形(remove the gray rectangle around the legend)

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R语言ggplot2可视化删除图例（legend）周围的灰色矩形(remove the gray rectangle around the legend)

#图例周围有灰色矩形

 #删除图例（legend）周围的灰色矩形

#无效方案

#图例周围有灰色矩形

ggtheme <- theme( axis.text.x = element_text(colour='black'), axis.text.y = element_text(colour='black'), panel.background = element_blank(), panel.grid.minor = element_blank(), panel.grid.major = element_blank(), panel.border = element_rect(colour='black', fill=NA), strip.background = element_blank(), legend.justification = c(0, 1), legend.position = c(0, 1), legend.background = element_rect(colour = NA), legend.key = element_rect(colour = "white", fill = NA), legend.title = element_blank() ) colors <- c("red", "blue") df <- data.frame(year = c(1:10), value = c(10:19), gender = rep(c("male","female"),each=5)) ggplot(df, aes(x = y