如何显示趋势线的图例？

Question

问题

我似乎很难显示使用stat_smooth() 生成的趋势线。在我使用参数show.legend = T 之前，我的图表如下所示：

添加参数后，我得到了这样的结果：

但是你看，我想单独显示趋势线图例，像这样：

我如何实现这一目标？如果您需要，我的源代码在这里（如果您能帮我截断代码以使其更简洁，我将不胜感激）：

library(ggplot2)
library(ggrepel)
library(ggthemes)
library(scales)
library(plotly)
library(grid)
library(extrafont)

# read data
econ <- read.csv("https://raw.githubusercontent.com/altaf-ali/ggplot_tutorial/master/data/economist.csv")
target_countries <- c("Russia", "Venezuela", "Iraq", "Myanmar", "Sudan",
  "Afghanistan", "Congo", "Greece", "Argentina", "Brazil",
  "India", "Italy", "China", "South Africa", "Spane",
  "Botswana", "Cape Verde", "Bhutan", "Rwanda", "France",
  "United States", "Germany", "Britain", "Barbados", "Norway", "Japan",
  "New Zealand", "Singapore")

econ$Country <- as.character(econ$Country)
labeled_countries <- subset(econ, Country %in% target_countries)
vector <- as.numeric(rownames(labeled_countries))

econ$CountryLabel <- econ$Country
econ$CountryLabel[1:173] <- ''
econ$CountryLabel[c(labeled_countries$X)] <- labeled_countries$Country

# Data Visualisation
g <- ggplot(data = econ, aes(CPI, HDI)) +
  geom_smooth(se = FALSE, method = 'lm', colour = 'red', fullrange = T, formula = y ~ log(x), show.legend = T) +
  geom_point(stroke = 0, color = 'white', size = 3, show.legend = T)

g <- g + geom_point(aes(color = Region), size = 3, pch = 1, stroke = 1.2)

g <- g + theme_economist_white()

g <- g + scale_x_continuous(limits = c(1,10), breaks = 1:10) +
   scale_y_continuous(limits = c(0.2, 1.0), breaks = seq(0.2, 1.0, 0.1)) +
   labs(title = 'Corruption and human development',
        caption='Source: Transparency International; UN Human Development Report')


g <- g + xlab('Corruption Perceptions Index, 2011 (10=least corrupt)') +
  ylab('Human Development Index, 2011 (1=best)')

g <- g + theme(plot.title = element_text(family = 'Arial Narrow', size = 14, margin = margin(5, 0, 12, 0)),
           plot.caption = element_text(family = 'Arial Narrow', hjust = 0, margin=margin(10,0,0,0)),
           axis.title.x = element_text(family = 'Arial Narrow', face = 'italic', size = 8, margin = margin(10, 0, 10, 0)),
           axis.title.y = element_text(family = 'Arial Narrow', face = 'italic', size = 8, margin = margin(0, 10, 0, 10)),
           plot.background = element_rect(fill = 'white'),
           legend.title = element_blank()
) + theme(legend.background = element_blank(),
         legend.key = element_blank(),
         legend.text = element_text(family = 'Arial Narrow', size = 10)) +
          guides(colour = guide_legend(nrow = 1))

g <- g + geom_text_repel(data = econ, aes(CPI, HDI, label = CountryLabel), family = 'Arial Narrow',
                      colour = 'grey10', force = 8, point.padding = 0.5, box.padding = 0.3,
                      segment.colour = 'grey10'
                      )

g
grid.rect(x = 1, y = 0.996, hjust = 1, vjust = 0, gp = gpar(fill = '#e5001c', lwd = 0))
grid.rect(x = 0.025, y = 0.91, hjust = 1, vjust = 0, gp = gpar(fill = '#e5001c', lwd = 0))

---

奖金申请

作为一个审美水平很高的人，我想知道：

1. 如何使国家标签分段不直？请参阅第三张图片，注意“中国”的线段不是直的。
2. 如何排列我的国家/地区标签，使它们不会在散点和趋势线上重叠？ （我查阅了this Stack Overflow 的帖子，从我的代码中可以看出，我为不需要的国家/地区创建了空字符串。但是，重叠仍然存在）
3. 如何将整个情节转换为可嵌入网站的交互式情节？

---

编辑： 感谢@aosmith 提供有用的建议。我关注this post 并尝试override.aes 我的趋势线。这是我在#Data Visualisation 会话中添加的内容：

g <- ggplot(data=econ, aes(CPI,HDI))+
  geom_smooth(se = FALSE, method = 'lm', aes(group = 1, colour = "Trendline"),fullrange=T, linetype=1,formula=y~log(x))+
  scale_colour_manual(values = c("purple", "green", "blue", "yellow",  "magenta","orange", "red"),
                      guides (colour = guide_legend (override.aes = list(linetype = 1)))

                      )+
  geom_point(...)
...

谢天谢地，它显示了趋势线图例。但仍然不理想：

如何改进代码？

Answer 1

问题出在guides 语句中。这是您的代码的数据可视化部分，有些固定：

# Data Visualisation
g <- ggplot(data = econ, aes(CPI, HDI)) +
  geom_smooth(se = FALSE, method = 'lm', aes(group = 1, colour = "Trendline"), fullrange=T, linetype=1, formula=y~log(x)) +
  geom_point(stroke = 0, color = 'white', size = 3, show.legend = T) +
  scale_colour_manual(values = c("purple", "green", "blue", "yellow", "magenta", "orange", "red"))


g <- g + geom_point(aes(color = Region), size = 3, pch = 1, stroke = 1.2)

g <- g + theme_economist_white()

g <- g + scale_x_continuous(limits = c(1,10), breaks = 1:10) +
  scale_y_continuous(limits = c(0.2, 1.0), breaks = seq(0.2, 1.0, 0.1)) +
  labs(title = 'Corruption and human development',
       caption='Source: Transparency International; UN Human Development Report')


g <- g + xlab('Corruption Perceptions Index, 2011 (10=least corrupt)') +
  ylab('Human Development Index, 2011 (1=best)')

g <- g + theme(plot.title = element_text(family = 'Arial Narrow', size = 14, margin = margin(5, 0, 12, 0)),
               plot.caption = element_text(family = 'Arial Narrow', hjust = 0, margin=margin(10,0,0,0)),
               axis.title.x = element_text(family = 'Arial Narrow', face = 'italic', size = 8, margin = margin(10, 0, 10, 0)),
               axis.title.y = element_text(family = 'Arial Narrow', face = 'italic', size = 8, margin = margin(0, 10, 0, 10)),
               plot.background = element_rect(fill = 'white'),
               legend.title = element_blank()
) + theme(legend.background = element_blank(),
          legend.key = element_blank(),
          legend.text = element_text(family = 'Arial Narrow', size = 10))

g <- g + geom_text_repel(data = econ, aes(CPI, HDI, label = CountryLabel), family = 'Arial Narrow',
                         colour = 'grey10', force = 8, point.padding = 0.5, box.padding = 0.3,
                         segment.colour = 'grey10'
)

g + guides(colour = guide_legend(nrow = 1,
      override.aes = list(linetype = c(rep("blank", 6), "solid"),
                          shape = c(rep(1, 6), NA)
                          )
      )
    )