r - ggplot2，geom_segment 的颜色段

Question

我正在制作一些室内和室外事件的相当复杂的情节，但我有点陷入困境。我想通过(Xmin、Ymin 和 Zmin)在 geom_segment 中添加对室内/室外花费的分钟数进行着色> 我的情节的步骤(见下文)。目前它的颜色仅 Zmin(使用连续变量，有点关闭)。

我已经粘贴了所有代码，以防其他人想要构建这样的东西，我最初的灵感来自 this blog post .

如有任何帮助，我们将不胜感激，谢谢!

df <- data.frame(
  date = seq(Sys.Date(), len= 156, by="4 day")[sample(156, 26)],
  action = paste('Then', LETTERS[1:13], 'happed, which was not related to', LETTERS[14:26]),
  IndoorOutdoor = rep(c(-1,1), 13),
  Xmin = sample(90, 26, replace = T),
  Ymin = sample(90, 26, replace = T),
  Zmin = sample(90, 26, replace = T)
)

df$XYZmin <- rowSums(df[,c("Xmin", "Ymin", "Zmin")])*df$IndoorOutdoor

# install.packages("ggplot2", dependencies = TRUE)
require(ggplot2)

# step 1 
plot <- ggplot(df,aes(x=date,y=0))

# step 2, this is where I want to add 'more' color 
plot <- plot + geom_segment(aes(y=0,yend=XYZmin,xend=date, colour= Zmin))

# The text is added as follows
plot <- plot + geom_text(aes(y=XYZmin,label=paste(action, '\n this happed on ', date)),size=2.5,hjust=-.01, vjust=-.01, angle = 35)

# points at the end of the line segments
plot <- plot + geom_point(aes(y=XYZmin))

# #raw a vertical line
plot <- plot + geom_hline(y=0,size=1,color='purple')

#drawing the actual arrow
# plot <- plot + geom_segment(x=2011.4,xend=2012.2,y=.2,yend=0,color='purple',size=1) + geom_segment(x=2011.4,xend=2012.2,y=-.2,yend=0,color='purple',size=1)

plot <- plot + theme(axis.text.y = element_blank()) + ylab('') + xlab('')
plot + labs(title = "Timeline for when what happened")

Answer 1

这里有两种方法。一个用不同的geom_segment构建每一行(我认为这更接近你正在做的事情？)另一个只使用geom_bar，这将是我的偏好(更多可扩展)。我认为在构建 data.frame 时出现错误 - 在创建 IndoorOutdoor 时创建了 56 行，这会在以后出现问题。我已在下面进行了更改。

set.seed(1234)
df <- data.frame(
  date = seq(Sys.Date(), len= 156, by="4 day")[sample(156, 26)],
  action = paste('Then', LETTERS[1:13], 'happed, which was not related to', LETTERS[14:26]),
  IndoorOutdoor = rep(c(-1,1), 13), #Change so there are only 26 rows
  Xmin = sample(90, 26, replace = T),
  Ymin = sample(90, 26, replace = T),
  Zmin = sample(90, 26, replace = T)
)

df$XYZmin <- rowSums(df[,c("Xmin", "Ymin", "Zmin")])*df$IndoorOutdoor
df[,8:10] <- df[,4:6]*df[,3] #Adding the sign to each X/Y/Z
names(df)[8:10] <- paste0(names(df)[4:6],"p") #to differentiate from your X/Y/Z
require(ggplot2)

对于 geom_bar 解决方案，我然后熔化 df 以便可以绘制单个值，并将 fill 映射到变量( >Xmin 等)

df.m <- melt(df[,c(1:3,7:10)], measure.vars=c("Xminp", "Yminp", "Zminp"))
plot.alt <- ggplot(df.m, aes(date, value, fill=variable)) + 
  geom_bar(position="stack", stat="identity", width=0.5) + #width is just to make it look like yours
#All of this is from your original plot
  geom_text(aes(y=XYZmin,label=paste(action, '\n this happed on ', date)),size=2.5,hjust=-.01, vjust=-.01, angle = 35) + 

  geom_point(aes(y=XYZmin), show_guide=FALSE) +
  geom_hline(y=0,size=1,color='purple') +
  theme(axis.text.y = element_blank()) + ylab('') + xlab('') +
  labs(title = "Timeline for when what happened")
plot.alt

或者，这里有一种使用geom_segment构建它的方法:

plot <- ggplot(df,aes(x=date)) +
#Three geom_segments 
  geom_segment(aes(y=0,yend=Xminp,xend=date), colour= "blue") +
  geom_segment(aes(y=Xminp,yend=Xminp + Yminp,xend=date), colour= "red") +
  geom_segment(aes(y=Xminp + Yminp,yend=Xminp + Yminp + Zminp,xend=date), colour= "green") +
#This is all from your plot
  geom_text(aes(y=XYZmin,label=paste(action, '\n this happed on ', date)),size=2.5,hjust=-.01, vjust=-.01, angle = 35) +
  geom_point(aes(y=XYZmin)) +
  geom_hline(y=0,size=1,color='purple') +
  theme(axis.text.y = element_blank()) + ylab('') + xlab('') +
  labs(title = "Timeline for when what happened")
plot

希望这是有道理的...如果这不是您想要的，请告诉我。