如何改变“键"的方向. ggplot中的图例? [英] How to change the orientation of the "Key" of a Legend in ggplot?

问题描述

如何更改下面的标题的键，使其处于水平位置而又不更改图形的垂直线.

How can I change the key of the caption below so that it is in the horizontal position without changing the vertical lines of the graph.

set.seed(000)
m <- matrix(rnorm(100,0,1),100,1)
dt <- data.frame(m)
names(dt) <- c("X")

library(ggplot2)

g2 <- ggplot(dt, aes(x=X)) 
g2 <- g2+geom_histogram(aes(y=..density..),      # Histogram with density instead of count on y-axis
                        binwidth=.5,
                        colour="black", fill="white",breaks=seq(-2, 2, by = 0.1)) 
g2 <- g2+geom_density(alpha=.3, fill="#cccccc") # Overlay with transparent density plot
g2 <- g2+  geom_vline(aes(xintercept=0, linetype="Valor Verdadeiro"),show.legend =TRUE)
g2 <- g2+  geom_vline(aes(xintercept=mean(dt$X, na.rm=T),    linetype="Valor Estimado"),show.legend =TRUE)
g2 <- g2+  scale_linetype_manual(values=c("dotdash","solid")) # Overlay with transparent density plot
g2 <- g2+  xlab(expression(paste(gamma[1])))+ylab("Densidade")
g2 <- g2+  theme(legend.key.height = unit(2, "cm") ,
                 legend.position = c(0.95, 0.95),
                 legend.justification = c("right", "top"),
                 legend.box.just = "right",
                 legend.margin = margin(6, 6, 6, 6),
                 legend.title=element_blank(),
                 legend.direction = "vertical",
                 legend.background = element_rect(fill="gray", size=.5, linetype="dotted"))
g2 <- g2+ guides(linetype = guide_legend(override.aes = list(size = 1)))
g2

注意:我想从dotdash和solid格式的标题内旋转行.

Note: I want to rotate the line from within the caption that is in dotdash and solid format.

推荐答案

您可能不得不求助于ggplot grob并使用grid编辑功能.

You might have to resort to working with the ggplot grob and use grid editing functions.

# Your data and plot
set.seed(000)
m <- matrix(rnorm(100,0,1),100,1)
dt <- data.frame(m)
names(dt) <- c("X")

library(ggplot2)

g2 <- ggplot(dt, aes(x=X)) 
g2 <- g2+geom_histogram(aes(y=..density..),      # Histogram with density instead of count on y-axis
                        binwidth=.5,
                        colour="black", fill="white",breaks=seq(-2, 2, by = 0.1)) 
g2 <- g2+geom_density(alpha=.3, fill="#cccccc") # Overlay with transparent density plot
g2 <- g2+  geom_vline(aes(xintercept=0, linetype="Valor Verdadeiro"),show.legend =TRUE)
g2 <- g2+  geom_vline(aes(xintercept=mean(dt$X, na.rm=T),    linetype="Valor Estimado"),show.legend =TRUE)
g2 <- g2+  scale_linetype_manual(values=c("dotdash","solid")) # Overlay with transparent density plot
g2 <- g2+  xlab(expression(paste(gamma[1])))+ylab("Densidade")
g2 <- g2+  theme(legend.key.height = unit(2, "cm") ,
                 legend.position = c(0.95, 0.95),
                 legend.justification = c("right", "top"),
                 legend.box.just = "right",
                 legend.margin = margin(6, 6, 6, 6),
                 legend.title=element_blank(),
                 legend.direction = "vertical",
                 legend.background = element_rect(fill="gray", size=.5, linetype="dotted"))
g2 <- g2+ guides(linetype = guide_legend(override.aes = list(size = 1)))


# Adjust key height and width
g2 = g2 + theme(
   legend.key.height = unit(.6, "cm"),
   legend.key.width = unit(1, "cm"))

# Get the ggplot Grob
  gt = ggplotGrob(g2)

# grid::grid.ls(grid.force(gt))  # To get a list of editable grobs

# Edit the relevant keys
library(grid)
 gt <- editGrob(grid.force(gt), gPath("key-[3,4]-1-[1,2]"), 
        grep = TRUE, global = TRUE,
        x0 = unit(0, "npc"), y0 = unit(0.5, "npc"), 
        x1 = unit(1, "npc"), y1 = unit(0.5, "npc")) 

# Draw it
grid.newpage()
grid.draw(gt)

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