ggplot - add lines to plot - between points, not going through points

Question

I'm trying to add lines to an existing plot. Just ignore the data that is not plotted. geom_abline lets me add lines but they go through the whole graph. How can I crop the lines that they are only plotted e.g. between (0,0) and (10,-10)?

library(ggplot2)
  x <- c(2,4,6,4,7,5,3)
y <- c(4,5,6,7,8,6,4)
data <- data.frame(cbind(x,y))
ggplot(data, aes(x= x, y= y)) +
  expand_limits(y = c(25, -60), x = c(20,-5)) +
  geom_abline(intercept = 0, slope = -1) +
  geom_abline(intercept = 0, slope = -.5, linetype="dotted")

AK88 · Accepted Answer · 2017-07-19 11:51:34Z

2

Maybe like this:

library(ggplot2)
x <- c(2,4,6,4,7,5,3)
y <- c(4,5,6,7,8,6,4)
data <- data.frame(cbind(x,y))
ggplot(data, aes(x= x, y= y)) +
  expand_limits(y = c(25, -60), x = c(20,-5)) +
  geom_segment(aes(x = 0, xend = 10, y = 0, yend = 0 - 1*10)) +
  geom_segment(aes(x = 0, xend = 10, y = 0, yend = 0 - 0.5*10),
               linetype = 2)

edited Jul 19, 2017 at 11:51

answered Jul 19, 2017 at 11:38

AK88

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