Friday, January 25, 2019

r - organize text on geom_point using geom_text

I have a line plot with some time points that are hard to distinguish by the coloring alone and I would therefore like to label the time points on the plot, but the labels overlap (see plot below) in a way where it is hard to read the labels.



The plot currently look like this,



current plot



I wonder if there is a way to 'stack' the labels or some way (script) that can ensure they do not overlap. Something like this,



 - - >




Any help would be appreciated.



Here is the code I used to produce the plot,



 require(ggplot2)
require(plyr)
require(reshape)

# create sample data

set.seed(666)
dfn <- data.frame(
Referral = seq(as.Date("2007-01-15"), len= 26, by="23 day"),
VISIT01 = seq(as.Date("2008-06-15"), len= 24, by="15 day")[sample(30, 26)],
VISIT02 = seq(as.Date("2008-12-15"), len= 24, by="15 day")[sample(30, 26)],
VISIT03 = seq(as.Date("2009-01-01"), len= 24, by="15 day")[sample(30, 26)],
VISIT04 = seq(as.Date("2009-03-30"), len= 24, by="60 day")[sample(30, 26)],
VISIT05 = seq(as.Date("2010-11-30"), len= 24, by="6 day")[sample(30, 26)],
VISIT06 = seq(as.Date("2011-01-30"), len= 24, by="6 day")[sample(30, 26)],
Discharge = seq(as.Date("2012-03-30"), len= 24, by="30 day")[sample(30, 26)],

Patient = factor(1:26, labels = LETTERS),
openCase = rep(0:1, 100)[sample(100, 26)])

# set today's data for cases that do not have an Discharge date
dfn$Discharge[ is.na(dfn$Discharge) ] <- as.Date("2014-01-30")

mdfn <- melt(dfn, id=c('Patient', 'openCase'), variable_name = "Visit")
names(mdfn)[4] <- 'Year' # rename

# order data in mdfn by 'Referral' in dfn

mdfn$Patient <- factor(mdfn$Patient,levels =
(dfn$Patient[order(dfn$Referral)]),ordered = TRUE)

# subset a dataset to avoid 'Discharge' for cases that are not closed
mdfn2 <- subset(mdfn,!(Visit=="Discharge" & Year > as.Date("2014-01-01")))

# the plot as it looks now
ggplot(mdfn, aes(Year, Patient)) +
geom_blank() +
geom_line(data = mdfn[mdfn$openCase == 0,], colour = "black") +

geom_line(data = mdfn[mdfn$openCase == 1,], colour = "grey") +
geom_point(data = mdfn2, aes(colour = Visit), size = 4, shape = 124) +
geom_text(data=mdfn2, mapping=aes(x=Year, y=Patient,
label=substr(Visit, 1, 7), colour=Visit), size=2,
vjust=-.4, hjust=-.1, angle = 00)

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