r - 调整 ggplot2 中的 legend.title、legend.text 和图例颜色

Question

我无法更改图中分割图例的颜色。我需要两种不同的颜色作为图例和视觉图中的文本。

   er<-  ggmap(sq_map2) + 
   geom_point(data = sisquoc, size = 3,  aes(fill = Segmentation)) +
   geom_line(data = sisquoc, size = 3,  aes(color =SpeedMeterPerSecond)) +
   geom_text(data = sisquoc, aes(label = paste("  ", 
   as.character(Location_ids), sep="")), 
         angle = 60, hjust = 0, color = "sienna4",size = 6 ) 


   gg<- er  +   labs(x ="Longitude", y = "Latitude") +
   theme(axis.title = element_text(size=20), 
     panel.background = element_rect(fill = "white",size = 0.5, linetype = 
   "dotted"),
     panel.grid.major = element_line(size = 0.5, linetype = 'dotted',colour 
   = "black"), 
     panel.grid.minor = element_line(size = 0.5, linetype = 'dotted',colour 
   = "black"),
     panel.border = element_rect(colour = "black", fill=NA, size=0.5),
     axis.text.y   = element_text(size=18),
     axis.text.x   = element_text(size=18))

   gg  + theme(legend.position="right", 
         legend.title = element_text(colour="Black", size=18),
         legend.text = element_text(colour="black", size = 15),
         legend.background = element_rect(fill="grey90",
                                    size=0.5, linetype="solid", 
                                    colour ="black"))  + scale_color_continuous(name="Speed (m/s)\n")

Answer 1

像下面这样的东西应该可以工作。只需明确指定图例标题并在字符串末尾添加 \n，这会添加一个额外的空白行:

ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, col=Petal.Length))+ 
  geom_point() + scale_color_continuous(name="my scale\n")

或者，您可以尝试更改图例方向，这然而，当图例位于底部时，通常是最紧凑的。

ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, col=Petal.Length))+ 
  geom_point() + theme(legend.direction = "horizontal", legend.position = "bottom")