如何将图例放在交互式ggplot2热图上

Question

library(dplyr)
#> 
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#> 
#>     filter, lag
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, setequal, union
Apartment_no <- c("1-SV","1-SV","1-SV","1-SH","1-SH","1-SH","1-1V","1-1V","1-1V","1-1H","1-1H","1-1H","3-SV","3-SV","3-SV","3-1V","3-1V","3-1V","3-1H","3-1H","3-1H")
month <- c("September","October","November","September","October","November","September","October","November","September","October","November","September","October","November","September","October","November","September","October","November")
Days <- c(19,19,28,2,19,28,2,19,28,2,19,28,25,31,28,12,29,24,8,26,19)
Heat_clean <- data.frame(Apartment_no,month,Days)

我已经使用ggplot2创建了一个交互式热图。我使用了以下代码：

Heat_clean %>% 
mutate(color = case_when(Days <= 5 ~ "blue", 
Days <= 15 ~ "orange", 
Days <= 25 ~ "pink", 
is.na(Days) ~ "red", TRUE ~ "green")) %>% 
ggplot(aes(month,Apartment_no)) + 
geom_tile(aes(fill=color),color="white")+
scale_fill_identity()+
geom_text(aes(x=month,y=Apartment_no,label=Days))-> p

plotly::ggplotly(p)

不幸的是，我得到的颜色代替了图例，我希望条件和颜色一起成为图例。例如。如果在Days <= 5，color = Blue，525，color = Green时在上面的代码中看到。我希望他们成为传奇。我现在的情节可以在附图中看到

Answer 1

处理此问题的最简单方法是映射要在图例中显示的类别名称，并使用该名称进行美感填充。然后，您可以使用scale_fill_manual提供所需的颜色，ggplot将提供类别标签。

## separating assignment and plotting into separate blocks, to allow more control
clean_heat <- Heat_clean %>% 
      mutate(color = case_when(Days <= 5 ~ "Less than 5", 
                               Days <= 15 ~ "5 to 15", 
                               Days <= 25 ~ "15 to 25", 
                               is.na(Days) ~ "missing", TRUE ~ "more than 25"))

# Using factors to allow for control about plotting order. The following makes it an ordered factor

clean_heat$color <- factor(clean_heat$color, 
                           levels = c( "Less than 5",    "5 to 15",  "15 to 25"  ,    "more than 25", "missing")
)

clean_heat %>%
      ggplot(aes(month,Apartment_no, fill = color)) + 
      geom_tile(color = "white")+
      geom_text(aes(x=month,y=Apartment_no,label=Days))+
      scale_fill_manual(
            values = c("blue", "orange", "pink", "green", "red"),
            name = "Legend"
            )