Does anyone know which argument within geom_abline()
is responsible for not affecting the x and y scales?
The function draw_panel()
w/i GeomAbline
gets the underlying "ranges", but the line should than be typically lie outside the original scales:
GeomAbline <- ggproto("GeomAbline", Geom,
draw_panel = function(data, panel_params, coord) {
ranges <- coord$backtransform_range(panel_params)
data$x <- ranges$x[1]
data$xend <- ranges$x[2]
data$y <- ranges$x[1] * data$slope + data$intercept
data$yend <- ranges$x[2] * data$slope + data$intercept
GeomSegment$draw_panel(unique(data), panel_params, coord)
},
default_aes = aes(colour = "black", size = 0.5, linetype = 1, alpha = NA),
required_aes = c("slope", "intercept"),
draw_key = draw_key_abline
)
My guess are the arguments/functions ggplot2::StatIdentity
and ggplot2::PositionIdentity
set in ggplot2:layer()
of geom_abline()
. But I don't understand how this works? My motivation is to write a new geom_*
that also does not affect the x and y scales.